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raylib-src/src/external/rlsw.h

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/**
* MIT License
*
* Copyright (c) 2025 Le Juez Victor
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef RLSW_H
#define RLSW_H
#include <stdbool.h>
#include <stdint.h>
/* === RLSW Definition And Macros === */
#ifndef SW_MALLOC
# define SW_MALLOC(sz) malloc(sz)
#endif
#ifndef SW_FREE
# define SW_FREE(ptr) free(ptr)
#endif
#ifndef SW_MAX_PROJECTION_STACK_SIZE
# define SW_MAX_PROJECTION_STACK_SIZE 2
#endif
#ifndef SW_MAX_MODELVIEW_STACK_SIZE
# define SW_MAX_MODELVIEW_STACK_SIZE 8
#endif
#ifndef SW_MAX_TEXTURE_STACK_SIZE
# define SW_MAX_TEXTURE_STACK_SIZE 4
#endif
#ifndef SW_MAX_TEXTURES
# define SW_MAX_TEXTURES 128
#endif
#ifndef SW_MAX_CLIPPED_POLYGON_VERTICES
# define SW_MAX_CLIPPED_POLYGON_VERTICES 12
#endif
#ifndef SW_CLIP_EPSILON
# define SW_CLIP_EPSILON 1e-4f
#endif
/* === OpenGL Definitions === */
#define GL_TEXTURE_2D 0x0DE1
#define GL_DEPTH_TEST 0x0B71
#define GL_CULL_FACE 0x0B44
#define GL_BLEND 0x0BE2
#define GL_MODELVIEW 0x1700
#define GL_PROJECTION 0x1701
#define GL_TEXTURE 0x1702
#define GL_VERTEX_ARRAY 0x8074
#define GL_NORMAL_ARRAY 0x8075
#define GL_COLOR_ARRAY 0x8076
//#define GL_INDEX_ARRAY 0x8077
#define GL_TEXTURE_COORD_ARRAY 0x8078
#define GL_POINTS 0x0000
#define GL_LINES 0x0001
//#define GL_LINE_LOOP 0x0002
//#define GL_LINE_STRIP 0x0003
#define GL_TRIANGLES 0x0004
//#define GL_TRIANGLE_STRIP 0x0005
//#define GL_TRIANGLE_FAN 0x0006
#define GL_QUADS 0x0007
//#define GL_QUAD_STRIP 0x0008
//#define GL_POLYGON 0x0009
//#define GL_CW 0x0900
//#define GL_CCW 0x0901
#define GL_FRONT 0x0404
#define GL_BACK 0x0405
#define GL_ZERO 0
#define GL_ONE 1
#define GL_SRC_COLOR 0x0300
#define GL_ONE_MINUS_SRC_COLOR 0x0301
#define GL_SRC_ALPHA 0x0302
#define GL_ONE_MINUS_SRC_ALPHA 0x0303
#define GL_DST_ALPHA 0x0304
#define GL_ONE_MINUS_DST_ALPHA 0x0305
#define GL_DST_COLOR 0x0306
#define GL_ONE_MINUS_DST_COLOR 0x0307
#define GL_SRC_ALPHA_SATURATE 0x0308
#define GL_NEAREST 0x2600
#define GL_LINEAR 0x2601
#define GL_REPEAT 0x2901
#define GL_CLAMP_TO_EDGE 0x812F //< (OpenGL 1.2)
#define GL_MIRRORED_REPEAT 0x8370 //< (OpenGL 2.0)
#define GL_TEXTURE_MAG_FILTER 0x2800
#define GL_TEXTURE_MIN_FILTER 0x2801
#define GL_TEXTURE_WRAP_S 0x2802
#define GL_TEXTURE_WRAP_T 0x2803
#define GL_NO_ERROR 0
#define GL_INVALID_ENUM 0x0500
#define GL_INVALID_VALUE 0x0501
#define GL_INVALID_OPERATION 0x0502
#define GL_STACK_OVERFLOW 0x0503
#define GL_STACK_UNDERFLOW 0x0504
#define GL_OUT_OF_MEMORY 0x0505
/* === RLSW Enums === */
typedef enum {
SW_TEXTURE_2D = GL_TEXTURE_2D,
SW_DEPTH_TEST = GL_DEPTH_TEST,
SW_CULL_FACE = GL_CULL_FACE,
SW_BLEND = GL_BLEND
} SWstate;
typedef enum {
SW_PROJECTION = GL_PROJECTION,
SW_MODELVIEW = GL_MODELVIEW,
SW_TEXTURE = GL_TEXTURE
} SWmatrix;
typedef enum {
SW_VERTEX_ARRAY = GL_VERTEX_ARRAY,
SW_TEXTURE_COORD_ARRAY = GL_TEXTURE_COORD_ARRAY,
SW_NORMAL_ARRAY = GL_NORMAL_ARRAY,
SW_COLOR_ARRAY = GL_COLOR_ARRAY
} SWarray;
typedef enum {
SW_POINTS = GL_POINTS,
SW_LINES = GL_LINES,
SW_TRIANGLES = GL_TRIANGLES,
SW_QUADS = GL_QUADS,
} SWdraw;
typedef enum {
SW_FRONT = GL_FRONT,
SW_BACK = GL_BACK,
} SWface;
typedef enum {
SW_ZERO = GL_ZERO,
SW_ONE = GL_ONE,
SW_SRC_COLOR = GL_SRC_COLOR,
SW_ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR,
SW_SRC_ALPHA = GL_SRC_ALPHA,
SW_ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA,
SW_DST_ALPHA = GL_DST_ALPHA,
SW_ONE_MINUS_DST_ALPHA = GL_ONE_MINUS_DST_ALPHA,
SW_DST_COLOR = GL_DST_COLOR,
SW_ONE_MINUS_DST_COLOR = GL_ONE_MINUS_DST_COLOR,
SW_SRC_ALPHA_SATURATE = GL_SRC_ALPHA_SATURATE
} SWfactor;
typedef enum {
SW_PIXELFORMAT_UNCOMPRESSED_GRAYSCALE = 1, // 8 bit per pixel (no alpha)
SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA, // 8*2 bpp (2 channels)
SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5, // 16 bpp
SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8, // 24 bpp
SW_PIXELFORMAT_UNCOMPRESSED_R5G5B5A1, // 16 bpp (1 bit alpha)
SW_PIXELFORMAT_UNCOMPRESSED_R4G4B4A4, // 16 bpp (4 bit alpha)
SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, // 32 bpp
SW_PIXELFORMAT_UNCOMPRESSED_R32, // 32 bpp (1 channel - float)
SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32, // 32*3 bpp (3 channels - float)
SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32, // 32*4 bpp (4 channels - float)
SW_PIXELFORMAT_UNCOMPRESSED_R16, // 16 bpp (1 channel - half float)
SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16, // 16*3 bpp (3 channels - half float)
SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16, // 16*4 bpp (4 channels - half float)
SW_PIXELFORMAT_COMPRESSED_DXT1_RGB, // 4 bpp (no alpha)
SW_PIXELFORMAT_COMPRESSED_DXT1_RGBA, // 4 bpp (1 bit alpha)
SW_PIXELFORMAT_COMPRESSED_DXT3_RGBA, // 8 bpp
SW_PIXELFORMAT_COMPRESSED_DXT5_RGBA, // 8 bpp
SW_PIXELFORMAT_COMPRESSED_ETC1_RGB, // 4 bpp
SW_PIXELFORMAT_COMPRESSED_ETC2_RGB, // 4 bpp
SW_PIXELFORMAT_COMPRESSED_ETC2_EAC_RGBA, // 8 bpp
SW_PIXELFORMAT_COMPRESSED_PVRT_RGB, // 4 bpp
SW_PIXELFORMAT_COMPRESSED_PVRT_RGBA, // 4 bpp
SW_PIXELFORMAT_COMPRESSED_ASTC_4x4_RGBA, // 8 bpp
SW_PIXELFORMAT_COMPRESSED_ASTC_8x8_RGBA // 2 bpp
} SWpixelformat;
typedef enum {
SW_NEAREST = GL_NEAREST,
SW_LINEAR = GL_LINEAR
} SWfilter;
typedef enum {
SW_REPEAT = GL_REPEAT,
SW_CLAMP_TO_EDGE = GL_CLAMP_TO_EDGE,
SW_MIRRORED_REPEAT = GL_MIRRORED_REPEAT
} SWwrap;
typedef enum {
SW_TEXTURE_MIN_FILTER = GL_TEXTURE_MIN_FILTER,
SW_TEXTURE_MAG_FILTER = GL_TEXTURE_MAG_FILTER,
SW_TEXTURE_WRAP_S = GL_TEXTURE_WRAP_S,
SW_TEXTURE_WRAP_T = GL_TEXTURE_WRAP_T
} SWtexparam;
typedef enum {
SW_NO_ERROR = GL_NO_ERROR,
SW_INVALID_ENUM = GL_INVALID_ENUM,
SW_INVALID_VALUE = GL_INVALID_VALUE,
SW_STACK_OVERFLOW = GL_STACK_OVERFLOW,
SW_STACK_UNDERFLOW = GL_STACK_UNDERFLOW,
SW_INVALID_OPERATION = GL_INVALID_OPERATION,
} SWerrcode;
/* === Public API === */
void swInit(int w, int h);
void swClose(void);
void swEnable(SWstate state);
void swDisable(SWstate state);
void* swGetColorBuffer(int* w, int* h);
void swMatrixMode(SWmatrix mode);
void swPushMatrix(void);
void swPopMatrix(void);
void swLoadIdentity(void);
void swTranslatef(float x, float y, float z);
void swRotatef(float angle, float x, float y, float z);
void swScalef(float x, float y, float z);
void swMultMatrixf(const float* mat);
void swFrustum(double left, double right, double bottom, double top, double znear, double zfar);
void swOrtho(double left, double right, double bottom, double top, double znear, double zfar);
void swViewport(int x, int y, int width, int height);
void swClearColor(float r, float g, float b, float a);
void swClear(void);
void swBlendFunc(SWfactor sfactor, SWfactor dfactor);
void swCullFace(SWface face);
void swBegin(SWdraw mode);
void swEnd(void);
void swVertex2i(int x, int y);
void swVertex2f(float x, float y);
void swVertex2fv(const float* v);
void swVertex3i(int x, int y, int z);
void swVertex3f(float x, float y, float z);
void swVertex3fv(const float* v);
void swVertex4i(int x, int y, int z, int w);
void swVertex4f(float x, float y, float z, float w);
void swVertex4fv(const float* v);
void swColor1ui(uint32_t color);
void swColor3ub(uint8_t r, uint8_t g, uint8_t b);
void swColor3ubv(const uint8_t* v);
void swColor3us(uint16_t r, uint16_t g, uint16_t b);
void swColor3usv(const uint16_t* v);
void swColor3ui(uint32_t r, uint32_t g, uint32_t b);
void swColor3uiv(const uint32_t* v);
void swColor3f(float r, float g, float b);
void swColor3fv(const float* v);
void swColor4ub(uint8_t r, uint8_t g, uint8_t b, uint8_t a);
void swColor4ubv(const uint8_t* v);
void swColor4us(uint16_t r, uint16_t g, uint16_t b, uint16_t a);
void swColor4usv(const uint16_t* v);
void swColor4ui(uint32_t r, uint32_t g, uint32_t b, uint32_t a);
void swColor4uiv(const uint32_t* v);
void swColor4f(float r, float g, float b, float a);
void swColor4fv(const float* v);
void swTexCoord2f(float u, float v);
void swTexCoordfv(const float* v);
void swNormal3f(float x, float y, float z);
void swNormal3fv(const float* v);
void swBindArray(SWarray type, void *buffer);
void swDrawArrays(SWdraw mode, int offset, int count);
uint32_t swLoadTexture(const void *data, int width, int height, int format, int mipmapCount);
void swUnloadTexture(uint32_t id);
void swTextureParameters(uint32_t id, int param, int value);
void swBindTexture(uint32_t id);
#endif // RLSW_H
#ifdef RLSW_IMPL
#include <stdlib.h>
#include <math.h>
/* === Defines and Macros === */
#define SW_PI 3.14159265358979323846f
#define SW_DEG2RAD (SW_PI/180.0f)
#define SW_RAD2DEG (180.0f/SW_PI)
#define SW_STATE_CHECK(flags) ((RLSW.stateFlags & (flags)) == (flags))
#define SW_STATE_TEXTURE_2D (1 << 0)
#define SW_STATE_DEPTH_TEST (1 << 1)
#define SW_STATE_CULL_FACE (1 << 2)
#define SW_STATE_BLEND (1 << 3)
#define SW_CLIP_INSIDE (0x00) // 0000
#define SW_CLIP_LEFT (0x01) // 0001
#define SW_CLIP_RIGHT (0x02) // 0010
#define SW_CLIP_BOTTOM (0x04) // 0100
#define SW_CLIP_TOP (0x08) // 1000
/* === Internal Structs === */
typedef float sw_matrix_t[4*4];
typedef uint16_t sw_half_t;
typedef struct {
float position[4]; // Position coordinates
float normal[3]; // Normal vector
float texcoord[2]; // Texture coordinates
float color[4]; // Color
float homogeneous[4]; // Homogeneous coordinates
float screen[2]; // Screen coordinates
} sw_vertex_t;
typedef struct {
const void* pixels;
int width;
int height;
int format;
SWfilter minFilter;
SWfilter magFilter;
SWwrap sWrap;
SWwrap tWrap;
float tx;
float ty;
} sw_texture_t;
typedef struct {
uint8_t *color; // 32-bit RGBA color buffer
uint16_t *depth; // 16-bit fixed fract buffer
int width, height;
} sw_framebuffer_t;
typedef struct {
sw_framebuffer_t framebuffer;
uint8_t clearColor[4]; // Color used to clear the screen
uint16_t clearDepth; // Depth value used to clear the screen
uint32_t currentTexture;
sw_matrix_t *currentMatrix;
int vpPos[2]; // Represents the top-left corner of the viewport
int vpDim[2]; // Represents the dimensions of the viewport (minus one)
int vpMin[2]; // Represents the minimum renderable point of the viewport (top-left)
int vpMax[2]; // Represents the maximum renderable point of the viewport (bottom-right)
struct {
float* positions;
float* texcoords;
float* normals;
uint8_t* colors;
} array;
sw_vertex_t vertexBuffer[4]; // Buffer used for storing primitive vertices, used for processing and rendering
int vertexCounter; // Number of vertices in 'ctx.vertexBuffer'
SWdraw drawMode; // Current polygon filling mode (e.g., lines, triangles)
float pointSize; // Rasterized point size
float lineWidth; // Rasterized line width
sw_matrix_t matProjection; // Projection matrix, user adjustable
sw_matrix_t matTexture; // Texture matrix, user adjustable
sw_matrix_t matModel; // Model matrix, user adjustable (the one used if we push in SW_MODELVIEW mode)
sw_matrix_t matView; // View matrix, user adjustable (the default one used in SW_MODELVIEW mode)
sw_matrix_t matMVP; // Model view projection matrix, calculated and used internally
sw_matrix_t stackProjection[SW_MAX_PROJECTION_STACK_SIZE]; // Projection matrix stack for push/pop operations
sw_matrix_t stackModelview[SW_MAX_MODELVIEW_STACK_SIZE]; // Modelview matrix stack for push/pop operations
sw_matrix_t stackTexture[SW_MAX_TEXTURE_STACK_SIZE]; // Texture matrix stack for push/pop operations
uint32_t stackProjectionCounter; // Counter for matrix stack operations
uint32_t stackModelviewCounter; // Counter for matrix stack operations
uint32_t stackTextureCounter; // Counter for matrix stack operations
SWmatrix currentMatrixMode; // Current matrix mode (e.g., sw_MODELVIEW, sw_PROJECTION)
bool modelMatrixUsed; // Flag indicating if the model matrix is used
SWfactor srcFactor;
SWfactor dstFactor;
SWface cullFace; // Faces to cull
SWerrcode errCode; // Last error code
sw_texture_t* loadedTextures;
int loadedTextureCount;
uint32_t* freeTextureIds;
int freeTextureIdCount;
uint32_t stateFlags;
} sw_data_t;
/* === Global Data === */
static sw_data_t RLSW = { 0 };
/* === Helper Functions === */
static inline void sw_matrix_id(sw_matrix_t dst)
{
dst[0] = 1, dst[1] = 0, dst[2] = 0, dst[3] = 0;
dst[4] = 0, dst[5] = 1, dst[6] = 0, dst[7] = 0;
dst[8] = 0, dst[9] = 0, dst[10] = 1, dst[11] = 0;
dst[12] = 0, dst[13] = 0, dst[14] = 0, dst[15] = 1;
}
static inline void sw_matrix_mul(sw_matrix_t dst, const sw_matrix_t left, const sw_matrix_t right)
{
sw_matrix_t result;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
float sum = 0.0;
for (int k = 0; k < 4; k++) {
sum += left[i * 4 + k] * right[k * 4 + j];
}
result[i * 4 + j] = sum;
}
}
for (int i = 0; i < 16; i++) {
dst[i] = result[i];
}
}
static inline void sw_vec4_transform(float dst[4], const float v[4], const sw_matrix_t mat)
{
float tmp[4] = {
mat[0] * v[0] + mat[4] * v[1] + mat[8] * v[2] + mat[12] * v[3],
mat[1] * v[0] + mat[5] * v[1] + mat[9] * v[2] + mat[13] * v[3],
mat[2] * v[0] + mat[6] * v[1] + mat[10] * v[2] + mat[14] * v[3],
mat[3] * v[0] + mat[7] * v[1] + mat[11] * v[2] + mat[15] * v[3]
};
for (int i = 0; i < 4; i++) {
dst[i] = tmp[i];
}
}
static inline float sw_saturate(float x)
{
// After several comparisons, this saturation method
// seems to be the most optimized by GCC and Clang,
// and it does not produce any conditional branching.
// However, it is possible that a clamp could be
// more efficient on certain platforms.
// Comparisons will need to be made.
// SEE: https://godbolt.org/z/5qYznK5zj
// Saturation from below: max(0, x)
float y = 0.5f * (x + fabsf(x));
// Saturation from above: min(1, y)
return y - 0.5f * ((y - 1.0f) + fabsf(y - 1.0f));
// return (x < 0.0f) ? 0.0f : ((x > 1.0f) ? 1.0f : x);
}
static inline float sw_lerp(float a, float b, float t)
{
return a + t * (b - a);
}
static inline sw_vertex_t sw_lerp_vertex(const sw_vertex_t* a, const sw_vertex_t* b, float t)
{
sw_vertex_t result;
for (int i = 0; i < sizeof(sw_vertex_t) / sizeof(float); i++) {
((float*)&result)[i] = sw_lerp(((float*)a)[i], ((float*)b)[i], t);
}
return result;
}
/* === Pixel Format Conversion Part === */
static inline uint32_t sw_cvt_hf_ui(uint16_t h)
{
uint32_t s = (uint32_t)(h & 0x8000) << 16;
int32_t em = h & 0x7fff;
// bias exponent and pad mantissa with 0; 112 is relative exponent bias (127-15)
int32_t r = (em + (112 << 10)) << 13;
// denormal: flush to zero
r = (em < (1 << 10)) ? 0 : r;
// infinity/NaN; note that we preserve NaN payload as a byproduct of unifying inf/nan cases
// 112 is an exponent bias fixup; since we already applied it once, applying it twice converts 31 to 255
r += (em >= (31 << 10)) ? (112 << 23) : 0;
return s | r;
}
static inline float sw_cvt_hf(sw_half_t y)
{
union { float f; uint32_t i; } v = {
.i = sw_cvt_hf_ui(y)
};
return v.f;
}
static inline void sw_get_pixel_grayscale(float* color, const void* pixels, uint32_t offset)
{
float gray = (float)((uint8_t*)pixels)[offset] / 255;
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 1.0f;
}
static inline void sw_get_pixel_red_16(float* color, const void* pixels, uint32_t offset)
{
float value = sw_cvt_hf(((sw_half_t*)pixels)[offset]);
color[0] = value;
color[1] = value;
color[2] = value;
color[3] = 1.0f;
}
static inline void sw_get_pixel_red_32(float* color, const void* pixels, uint32_t offset)
{
float value = ((float*)pixels)[offset];
color[0] = value;
color[1] = value;
color[2] = value;
color[3] = 1.0f;
}
static inline void sw_get_pixel_grayscale_alpha(float* color, const void* pixels, uint32_t offset)
{
float gray = (float)((uint8_t*)pixels)[2 * offset] / 255;
float alpha = (float)((uint8_t*)pixels)[2 * offset + 1] / 255;
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = alpha;
}
static inline void sw_get_pixel_rgb_565(float* color, const void* pixels, uint32_t offset)
{
uint16_t pixel = ((uint16_t*)pixels)[offset];
color[0] = (float)((pixel & 0xF800) >> 11) / 31;
color[1] = (float)((pixel & 0x7E0) >> 5) / 63;
color[2] = (float)(pixel & 0x1F) / 31;
color[3] = 1.0f;
}
static inline void sw_get_pixel_rgb_888(float* color, const void* pixels, uint32_t offset)
{
const uint8_t* pixel = (uint8_t*)pixels + 3 * offset;
color[0] = (float)pixel[0] / 255;
color[1] = (float)pixel[1] / 255;
color[2] = (float)pixel[2] / 255;
color[3] = 1.0f;
}
static inline void sw_get_pixel_rgb_161616(float* color, const void* pixels, uint32_t offset)
{
const sw_half_t *pixel = (sw_half_t*)pixels + 3 * offset;
color[0] = sw_cvt_hf(pixel[0]);
color[1] = sw_cvt_hf(pixel[1]);
color[2] = sw_cvt_hf(pixel[2]);
color[3] = 1.0f;
}
static inline void sw_get_pixel_rgb_323232(float* color, const void* pixels, uint32_t offset)
{
const float *pixel = (float*)pixels + 3 * offset;
color[0] = pixel[0];
color[1] = pixel[1];
color[2] = pixel[2];
color[3] = 1.0f;
}
static inline void sw_get_pixel_rgba_5551(float* color, const void* pixels, uint32_t offset)
{
uint16_t pixel = ((uint16_t*)pixels)[offset];
color[0] = (float)((pixel & 0xF800) >> 11) / 31;
color[1] = (float)((pixel & 0x7C0) >> 6) / 31;
color[2] = (float)((pixel & 0x3E) >> 1) / 31;
color[3] = (float)(pixel & 0x1);
}
static inline void sw_get_pixel_rgba_4444(float* color, const void* pixels, uint32_t offset)
{
uint16_t pixel = ((uint16_t*)pixels)[offset];
color[0] = (float)((pixel & 0xF000) >> 12) / 15;
color[1] = (float)((pixel & 0xF00) >> 8) / 15;
color[2] = (float)((pixel & 0xF0) >> 4) / 15;
color[3] = (float)(pixel & 0xF) / 15;
}
static inline void sw_get_pixel_rgba_8888(float* color, const void* pixels, uint32_t offset)
{
const uint8_t *pixel = (uint8_t*)pixels + 4 * offset;
color[0] = (float)pixel[0] / 255;
color[1] = (float)pixel[1] / 255;
color[2] = (float)pixel[2] / 255;
color[3] = (float)pixel[3] / 255;
}
static inline void sw_get_pixel_rgba_16161616(float* color, const void* pixels, uint32_t offset)
{
const sw_half_t *pixel = (sw_half_t*)pixels + 4 * offset;
color[0] = sw_cvt_hf(pixel[0]);
color[1] = sw_cvt_hf(pixel[1]);
color[2] = sw_cvt_hf(pixel[2]);
color[3] = sw_cvt_hf(pixel[3]);
}
static inline void sw_get_pixel_rgba_32323232(float* color, const void* pixels, uint32_t offset)
{
const float *pixel = (float*)pixels + 4 * offset;
color[0] = pixel[0];
color[1] = pixel[1];
color[2] = pixel[2];
color[3] = pixel[3];
}
static inline void sw_get_pixel(float* color, const void* pixels, uint32_t offset, SWpixelformat format)
{
switch (format) {
case SW_PIXELFORMAT_UNCOMPRESSED_GRAYSCALE:
sw_get_pixel_grayscale(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA:
sw_get_pixel_grayscale_alpha(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5:
sw_get_pixel_rgb_565(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8:
sw_get_pixel_rgb_888(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R5G5B5A1:
sw_get_pixel_rgba_5551(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R4G4B4A4:
sw_get_pixel_rgba_4444(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8:
sw_get_pixel_rgba_8888(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R32:
sw_get_pixel_red_32(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32:
sw_get_pixel_rgb_323232(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32:
sw_get_pixel_rgba_32323232(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R16:
sw_get_pixel_red_16(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16:
sw_get_pixel_rgb_161616(color, pixels, offset);
break;
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16:
sw_get_pixel_rgba_16161616(color, pixels, offset);
break;
case SW_PIXELFORMAT_COMPRESSED_DXT1_RGB:
case SW_PIXELFORMAT_COMPRESSED_DXT1_RGBA:
case SW_PIXELFORMAT_COMPRESSED_DXT3_RGBA:
case SW_PIXELFORMAT_COMPRESSED_DXT5_RGBA:
case SW_PIXELFORMAT_COMPRESSED_ETC1_RGB:
case SW_PIXELFORMAT_COMPRESSED_ETC2_RGB:
case SW_PIXELFORMAT_COMPRESSED_ETC2_EAC_RGBA:
case SW_PIXELFORMAT_COMPRESSED_PVRT_RGB:
case SW_PIXELFORMAT_COMPRESSED_PVRT_RGBA:
case SW_PIXELFORMAT_COMPRESSED_ASTC_4x4_RGBA:
case SW_PIXELFORMAT_COMPRESSED_ASTC_8x8_RGBA:
break;
}
}
/* === Texture Sampling Part === */
static inline void sw_texture_map_repeat(int* out, float in, int max)
{
// Upscale to nearest texture coordinates
// NOTE: We use '(int)(x+0.5)' although this is incorrect
// regarding the direction of rounding in case of negative values
// and also less accurate than roundf, but it remains so much more
// efficient that it is preferable for now to opt for this option.
*out = abs((int)((in - (int)in) * (max - 1) + 0.5f));
}
static inline void sw_texture_map_clamp_to_edge(int* out, float in, int max)
{
*out = (int)(sw_saturate(in) * (max - 1) + 0.5f);
}
static inline void sw_texture_map_mirrored_repeat(int* out, float in, int max)
{
in = fmodf(fabsf(in), 2);
if (in > 1.0f) in = 1.0f - (in - 1.0f);
*out = (int)(in * (max - 1) + 0.5f);
}
static inline void sw_texture_map(int* out, float in, int max, SWwrap mode)
{
switch (mode) {
case SW_REPEAT:
sw_texture_map_repeat(out, in, max);
break;
case SW_CLAMP_TO_EDGE:
sw_texture_map_clamp_to_edge(out, in, max);
break;
case SW_MIRRORED_REPEAT:
sw_texture_map_mirrored_repeat(out, in, max);
break;
}
}
static inline void sw_texture_sample_nearest(float* color, const sw_texture_t* tex, float u, float v)
{
int x, y;
sw_texture_map(&x, u, tex->width, tex->sWrap);
sw_texture_map(&y, v, tex->height, tex->tWrap);
sw_get_pixel(color, tex->pixels, y * tex->width + x, tex->format);
}
static inline void sw_texture_sample_linear(float* color, const sw_texture_t* tex, float u, float v)
{
int x0, y0, x1, y1;
sw_texture_map(&x0, u, tex->width, tex->sWrap);
sw_texture_map(&y0, v, tex->height, tex->tWrap);
sw_texture_map(&x1, u + tex->tx, tex->width, tex->sWrap);
sw_texture_map(&y1, v + tex->ty, tex->height, tex->tWrap);
float fx = u * (tex->width - 1) - x0;
float fy = v * (tex->height - 1) - y0;
float c00[4], c10[4], c01[4], c11[4];
sw_get_pixel(c00, tex->pixels, y0 * tex->width + x0, tex->format);
sw_get_pixel(c10, tex->pixels, y0 * tex->width + x1, tex->format);
sw_get_pixel(c01, tex->pixels, y1 * tex->width + x0, tex->format);
sw_get_pixel(c11, tex->pixels, y1 * tex->width + x1, tex->format);
float c0[4], c1[4];
for (int i = 0; i < 4; i++) {
float a = sw_lerp(c00[i], c10[i], fx);
float b = sw_lerp(c01[i], c11[i], fx);
color[i] = sw_lerp(a, b, fy);
}
}
static inline void sw_texture_sample(float* color, const sw_texture_t* tex, float u, float v,
float xDu, float yDu, float xDv, float yDv)
{
// TODO: It seems there are some incorrect detections depending on the context
// This is probably due to the fact that the fractions are obtained
// at the wrong moment during rasterization. It would be worth reviewing
// this, although the scanline method complicates things.
// Calculate the derivatives for each axis
float du = sqrtf(xDu * xDu + yDu * yDu);
float dv = sqrtf(xDv * xDv + yDv * yDv);
float L = (du > dv) ? du : dv;
// Select the filter based on the size of the footprint
if (L > 1.0f) {
// Minification
if (tex->minFilter == SW_NEAREST) {
sw_texture_sample_nearest(color, tex, u, v);
} else if (tex->minFilter == SW_LINEAR) {
sw_texture_sample_linear(color, tex, u, v);
}
} else {
// Magnification
if (tex->magFilter == SW_NEAREST) {
sw_texture_sample_nearest(color, tex, u, v);
} else if (tex->magFilter == SW_LINEAR) {
sw_texture_sample_linear(color, tex, u, v);
}
}
}
/* === Color Blending Functions === */
static inline void sw_blend_colors(float dst[4], float src[4])
{
float src_factor[4] = { 0 };
float dst_factor[4] = { 0 };
switch (RLSW.srcFactor) {
case SW_ZERO:
src_factor[0] = src_factor[1] = src_factor[2] = src_factor[3] = 0.0f;
break;
case SW_ONE:
src_factor[0] = src_factor[1] = src_factor[2] = src_factor[3] = 1.0f;
break;
case SW_SRC_COLOR:
src_factor[0] = src[0];
src_factor[1] = src[1];
src_factor[2] = src[2];
src_factor[3] = src[3];
break;
case SW_ONE_MINUS_SRC_COLOR:
src_factor[0] = 1.0f - src[0];
src_factor[1] = 1.0f - src[1];
src_factor[2] = 1.0f - src[2];
src_factor[3] = 1.0f - src[3];
break;
case SW_SRC_ALPHA:
src_factor[0] = src[3];
src_factor[1] = src[3];
src_factor[2] = src[3];
src_factor[3] = src[3];
break;
case SW_ONE_MINUS_SRC_ALPHA:
src_factor[0] = 1.0f - src[3];
src_factor[1] = 1.0f - src[3];
src_factor[2] = 1.0f - src[3];
src_factor[3] = 1.0f - src[3];
break;
case SW_DST_ALPHA:
src_factor[0] = dst[3];
src_factor[1] = dst[3];
src_factor[2] = dst[3];
src_factor[3] = dst[3];
break;
case SW_ONE_MINUS_DST_ALPHA:
src_factor[0] = 1.0f - dst[3];
src_factor[1] = 1.0f - dst[3];
src_factor[2] = 1.0f - dst[3];
src_factor[3] = 1.0f - dst[3];
break;
case SW_DST_COLOR:
src_factor[0] = dst[0];
src_factor[1] = dst[1];
src_factor[2] = dst[2];
src_factor[3] = dst[3];
break;
case SW_ONE_MINUS_DST_COLOR:
src_factor[0] = 1.0f - dst[0];
src_factor[1] = 1.0f - dst[1];
src_factor[2] = 1.0f - dst[2];
src_factor[3] = 1.0f - dst[3];
break;
case SW_SRC_ALPHA_SATURATE:
src_factor[0] = 1.0f;
src_factor[1] = 1.0f;
src_factor[2] = 1.0f;
src_factor[3] = fminf(src[3], 1.0f);
break;
}
switch (RLSW.dstFactor) {
case SW_ZERO:
dst_factor[0] = dst_factor[1] = dst_factor[2] = dst_factor[3] = 0.0f;
break;
case SW_ONE:
dst_factor[0] = dst_factor[1] = dst_factor[2] = dst_factor[3] = 1.0f;
break;
case SW_SRC_COLOR:
dst_factor[0] = src[0];
dst_factor[1] = src[1];
dst_factor[2] = src[2];
dst_factor[3] = src[3];
break;
case SW_ONE_MINUS_SRC_COLOR:
dst_factor[0] = 1.0f - src[0];
dst_factor[1] = 1.0f - src[1];
dst_factor[2] = 1.0f - src[2];
dst_factor[3] = 1.0f - src[3];
break;
case SW_SRC_ALPHA:
dst_factor[0] = src[3];
dst_factor[1] = src[3];
dst_factor[2] = src[3];
dst_factor[3] = src[3];
break;
case SW_ONE_MINUS_SRC_ALPHA:
dst_factor[0] = 1.0f - src[3];
dst_factor[1] = 1.0f - src[3];
dst_factor[2] = 1.0f - src[3];
dst_factor[3] = 1.0f - src[3];
break;
case SW_DST_ALPHA:
dst_factor[0] = dst[3];
dst_factor[1] = dst[3];
dst_factor[2] = dst[3];
dst_factor[3] = dst[3];
break;
case SW_ONE_MINUS_DST_ALPHA:
dst_factor[0] = 1.0f - dst[3];
dst_factor[1] = 1.0f - dst[3];
dst_factor[2] = 1.0f - dst[3];
dst_factor[3] = 1.0f - dst[3];
break;
case SW_DST_COLOR:
dst_factor[0] = dst[0];
dst_factor[1] = dst[1];
dst_factor[2] = dst[2];
dst_factor[3] = dst[3];
break;
case SW_ONE_MINUS_DST_COLOR:
dst_factor[0] = 1.0f - dst[0];
dst_factor[1] = 1.0f - dst[1];
dst_factor[2] = 1.0f - dst[2];
dst_factor[3] = 1.0f - dst[3];
break;
case SW_SRC_ALPHA_SATURATE:
// NOTE: This case is only available for the source.
// Since the factors are validated before assignment,
// we should never reach this point.
break;
}
for (int i = 0; i < 4; ++i) {
dst[i] = src_factor[i] * src[i] + dst_factor[i] * dst[i];
}
}
/* === Projection Helper Functions === */
static inline void sw_project_ndc_to_screen(float screen[2], const float ndc[4])
{
screen[0] = RLSW.vpPos[0] + (ndc[0] + 1.0f) * 0.5f * RLSW.vpDim[0];
screen[1] = RLSW.vpPos[1] + (ndc[1] + 1.0f) * 0.5f * RLSW.vpDim[1];
}
/* === Triangle Rendering Part === */
static inline bool sw_triangle_clip_w(sw_vertex_t polygon[SW_MAX_CLIPPED_POLYGON_VERTICES], int* vertexCounter)
{
sw_vertex_t input[SW_MAX_CLIPPED_POLYGON_VERTICES];
for (int i = 0; i < SW_MAX_CLIPPED_POLYGON_VERTICES; i++) {
input[i] = polygon[i];
}
int inputCounter = *vertexCounter;
*vertexCounter = 0;
const sw_vertex_t *prevVt = &input[inputCounter-1];
char prevDot = (prevVt->homogeneous[3] < SW_CLIP_EPSILON) ? -1 : 1;
for (int i = 0; i < inputCounter; i++) {
char currDot = (input[i].homogeneous[3] < SW_CLIP_EPSILON) ? -1 : 1;
if (prevDot*currDot < 0) {
polygon[(*vertexCounter)++] = sw_lerp_vertex(prevVt, &input[i],
(SW_CLIP_EPSILON - prevVt->homogeneous[3]) / (input[i].homogeneous[3] - prevVt->homogeneous[3]));
}
if (currDot > 0) {
polygon[(*vertexCounter)++] = input[i];
}
prevDot = currDot;
prevVt = &input[i];
}
return *vertexCounter > 0;
}
static inline bool sw_triangle_clip_xyz(sw_vertex_t polygon[SW_MAX_CLIPPED_POLYGON_VERTICES], int* vertexCounter)
{
for (int iAxis = 0; iAxis < 3; iAxis++)
{
if (*vertexCounter == 0) return false;
sw_vertex_t input[SW_MAX_CLIPPED_POLYGON_VERTICES];
int inputCounter;
const sw_vertex_t *prevVt;
char prevDot;
// Clip against first plane
for (int i = 0; i < SW_MAX_CLIPPED_POLYGON_VERTICES; i++) {
input[i] = polygon[i];
}
inputCounter = *vertexCounter;
*vertexCounter = 0;
prevVt = &input[inputCounter-1];
prevDot = (prevVt->homogeneous[iAxis] <= prevVt->homogeneous[3]) ? 1 : -1;
for (int i = 0; i < inputCounter; i++) {
char currDot = (input[i].homogeneous[iAxis] <= input[i].homogeneous[3]) ? 1 : -1;
if (prevDot * currDot <= 0) {
polygon[(*vertexCounter)++] = sw_lerp_vertex(prevVt, &input[i], (prevVt->homogeneous[3] - prevVt->homogeneous[iAxis]) /
((prevVt->homogeneous[3] - prevVt->homogeneous[iAxis]) - (input[i].homogeneous[3] - input[i].homogeneous[iAxis])));
}
if (currDot > 0) {
polygon[(*vertexCounter)++] = input[i];
}
prevDot = currDot;
prevVt = &input[i];
}
if (*vertexCounter == 0) return false;
// Clip against opposite plane
for (int i = 0; i < SW_MAX_CLIPPED_POLYGON_VERTICES; i++) {
input[i] = polygon[i];
}
inputCounter = *vertexCounter;
*vertexCounter = 0;
prevVt = &input[inputCounter-1];
prevDot = (-prevVt->homogeneous[iAxis] <= prevVt->homogeneous[3]) ? 1 : -1;
for (int i = 0; i < inputCounter; i++) {
char currDot = (-input[i].homogeneous[iAxis] <= input[i].homogeneous[3]) ? 1 : -1;
if (prevDot*currDot <= 0) {
polygon[(*vertexCounter)++] = sw_lerp_vertex(prevVt, &input[i], (prevVt->homogeneous[3] + prevVt->homogeneous[iAxis]) /
((prevVt->homogeneous[3] + prevVt->homogeneous[iAxis]) - (input[i].homogeneous[3] + input[i].homogeneous[iAxis])));
}
if (currDot > 0) {
polygon[(*vertexCounter)++] = input[i];
}
prevDot = currDot;
prevVt = &input[i];
}
}
return *vertexCounter > 0;
}
static inline void sw_triangle_project_and_clip(sw_vertex_t polygon[SW_MAX_CLIPPED_POLYGON_VERTICES], int* vertexCounter)
{
for (int i = 0; i < *vertexCounter; i++) {
sw_vertex_t *v = polygon + i;
sw_vec4_transform(v->homogeneous, v->position, RLSW.matMVP);
}
if (RLSW.stateFlags & SW_STATE_CULL_FACE) {
float x0 = polygon[0].homogeneous[0], y0 = polygon[0].homogeneous[1];
float x1 = polygon[1].homogeneous[0], y1 = polygon[1].homogeneous[1];
float x2 = polygon[2].homogeneous[0], y2 = polygon[2].homogeneous[1];
float sgnArea = (x1 - x0) * (y2 - y0) - (x2 - x0) * (y1 - y0);
if ((RLSW.cullFace == SW_FRONT && sgnArea >= 0) || (RLSW.cullFace == SW_BACK && sgnArea <= 0)) {
*vertexCounter = 0;
return;
}
}
if (sw_triangle_clip_w(polygon, vertexCounter) && sw_triangle_clip_xyz(polygon, vertexCounter)) {
for (int i = 0; i < *vertexCounter; i++) {
sw_vertex_t *v = polygon + i;
// Calculation of the reciprocal of W for normalization
// as well as perspective correct attributes
v->homogeneous[3] = 1.0f / v->homogeneous[3];
// Division of XYZ coordinates by weight
v->homogeneous[0] *= v->homogeneous[3];
v->homogeneous[1] *= v->homogeneous[3];
v->homogeneous[2] *= v->homogeneous[3];
// Division of texture coordinates (perspective correct)
v->texcoord[0] *= v->homogeneous[3];
v->texcoord[1] *= v->homogeneous[3];
// Division of colors (perspective correct)
v->color[0] *= v->homogeneous[3];
v->color[1] *= v->homogeneous[3];
v->color[2] *= v->homogeneous[3];
v->color[3] *= v->homogeneous[3];
// Transform to screen space
sw_project_ndc_to_screen(v->screen, v->homogeneous);
}
}
}
#define DEFINE_TRIANGLE_RASTER_SCANLINE(FUNC_NAME, ENABLE_TEXTURE, ENABLE_DEPTH_TEST, ENABLE_COLOR_BLEND) \
static inline void FUNC_NAME(const sw_texture_t* tex, const sw_vertex_t* start, \
const sw_vertex_t* end, float yDu, float yDv) \
{ \
/* Calculate the horizontal width and avoid division by zero */ \
float dx = end->screen[0] - start->screen[0]; \
if (fabsf(dx) < 1e-4f) return; \
\
/* Convert and center the screen coordinates */ \
int xStart = (int)(start->screen[0] + 0.5f); \
int xEnd = (int)(end->screen[0] + 0.5f); \
int y = (int)(start->screen[1] + 0.5f); \
\
/* Calculate the initial interpolation parameter and its increment */ \
float dt = 1.0f / dx; \
float t = (xStart - start->screen[0]) * dt; \
\
float xDu, xDv; \
if (ENABLE_TEXTURE) { \
/* Calculate the horizontal gradients for UV coordinates */ \
xDu = (end->texcoord[0] - start->texcoord[0]) * dt; \
xDv = (end->texcoord[1] - start->texcoord[1]) * dt; \
} \
\
/* Pre-calculate the color differences for interpolation */ \
float dcol[4]; \
for (int i = 0; i < 4; i++) { \
dcol[i] = end->color[i] - start->color[i]; \
} \
\
/* Pre-calculate the differences in Z and W \
(for depth testing and perspective correction) */ \
float dz = end->homogeneous[2] - start->homogeneous[2]; \
float dw = end->homogeneous[3] - start->homogeneous[3]; \
\
float u, v; \
if (ENABLE_TEXTURE) { \
/* Initialize the interpolated texture coordinates */ \
u = start->texcoord[0] + t * xDu; \
v = start->texcoord[1] + t * xDv; \
} \
\
/* Pre-calculate the starting pointer for the color framebuffer row */ \
uint8_t* cptrRow = (uint8_t*)((uint32_t*)RLSW.framebuffer.color + y * RLSW.framebuffer.width); \
uint8_t* cptr = cptrRow + xStart * 4; \
\
/* Pre-calculate the pointer for the depth buffer row */ \
uint16_t* dptrRow = RLSW.framebuffer.depth + y * RLSW.framebuffer.width + xStart; \
uint16_t* dptr = dptrRow; \
\
/* Scanline rasterization loop */ \
for (int x = xStart; x < xEnd; x++) { \
/* Interpolate Z and W for depth testing and perspective correction */ \
float w = 1.0f / (start->homogeneous[3] + t * dw); \
float z = start->homogeneous[2] + t * dz; \
\
if (ENABLE_DEPTH_TEST) { \
/* Depth testing with direct access to the depth buffer */ \
/* TODO: Implement different depth funcs? */ \
float depth = (float)(*dptr) / UINT16_MAX; \
if (z > depth) goto discard; \
} \
\
/* Update the depth buffer */ \
*dptr = (uint16_t)(z * UINT16_MAX); \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4] = { 0.0f, 0.0f, 0.0f, 0.0f }; \
float srcColor[4] = { 1.0f, 1.0f, 1.0f, 1.0f }; \
\
if (ENABLE_TEXTURE) { \
sw_texture_sample(srcColor, tex, u * w, v * w, xDu, yDu, xDv, yDv); \
} \
\
for (int i = 0; i < 4; i++) { \
dstColor[i] = (float)cptr[i] / 255; \
srcColor[i] *= (start->color[i] + t * dcol[i]) * w; \
} \
\
sw_blend_colors(dstColor, srcColor); \
\
for (int i = 0; i < 4; i++) { \
cptr[i] = (uint8_t)(sw_saturate(dstColor[i]) * 255); \
} \
} \
else \
{ \
if (ENABLE_TEXTURE) \
{ \
/* Sample the texture */ \
float texColor[4]; \
sw_texture_sample(texColor, tex, u * w, v * w, xDu, yDu, xDv, yDv); \
\
/* Interpolate the color and modulate by the texture color */ \
for (int i = 0; i < 4; i++) { \
float finalColor = texColor[i]; \
finalColor *= (start->color[i] + t * dcol[i]) * w; \
cptr[i] = (uint8_t)(sw_saturate(finalColor) * 255.0f); \
} \
} \
else \
{ \
/* Interpolate the color */ \
for (int i = 0; i < 4; i++) { \
float finalColor = (start->color[i] + t * dcol[i]) * w; \
cptr[i] = (uint8_t)(sw_saturate(finalColor) * 255.0f); \
} \
} \
} \
\
/* Increment the interpolation parameter, UVs, and pointers */ \
discard: \
t += dt; \
cptr += 4; \
dptr++; \
if (ENABLE_TEXTURE) { \
u += xDu; \
v += xDv; \
} \
} \
}
#define DEFINE_TRIANGLE_RASTER(FUNC_NAME, FUNC_SCANLINE, ENABLE_TEXTURE) \
static inline void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1, const sw_vertex_t* v2, \
const sw_texture_t* tex) \
{ \
/* Swap vertices by increasing y */ \
if (v0->screen[1] > v1->screen[1]) { const sw_vertex_t* tmp = v0; v0 = v1; v1 = tmp; } \
if (v1->screen[1] > v2->screen[1]) { const sw_vertex_t* tmp = v1; v1 = v2; v2 = tmp; } \
if (v0->screen[1] > v1->screen[1]) { const sw_vertex_t* tmp = v0; v0 = v1; v1 = tmp; } \
\
/* Extracting coordinates from the sorted vertices */ \
float x0 = v0->screen[0], y0 = v0->screen[1]; \
float x1 = v1->screen[0], y1 = v1->screen[1]; \
float x2 = v2->screen[0], y2 = v2->screen[1]; \
\
/* Reject degenerate triangles */ \
float height = y2 - y0; \
if (height < 1e-4f) return; \
\
/* Precompute the inverse of the triangle height and */ \
/* edge lengths with checks to avoid division by zero. */ \
float inv_height = 1.0f / height; \
float inv_y1y0 = (y1 - y0 > 1e-4f) ? 1.0f / (y1 - y0) : 0.0f; \
float inv_y2y1 = (y2 - y1 > 1e-4f) ? 1.0f / (y2 - y1) : 0.0f; \
\
/* Pre-calculation of slopes (dx/dy) */ \
float dx02 = (x2 - x0) * inv_height; \
float dx01 = (x1 - x0) * inv_y1y0; \
float dx12 = (x2 - x1) * inv_y2y1; \
\
/* Y bounds (vertical clipping) */ \
int yTop = (int)(y0 + 0.5f); \
int yMiddle = (int)(y1 + 0.5f); \
int yBottom = (int)(y2 + 0.5f); \
\
/* Global calculation of vertical texture gradients for the triangle */ \
float yDu, yDv; \
if (ENABLE_TEXTURE) { \
yDu = (v2->texcoord[0] - v0->texcoord[0]) * inv_height; \
yDv = (v2->texcoord[1] - v0->texcoord[1]) * inv_height; \
} \
\
/* Initializing scanline variables */ \
float xLeft = x0, xRight = x0; \
sw_vertex_t start, end; \
\
/* Scanline for the upper part of the triangle */ \
for (int y = yTop; y < yMiddle; y++) { \
float dy = (float)y - y0; \
float t1 = dy * inv_height; \
float t2 = dy * inv_y1y0; \
\
/* Vertex interpolation */ \
start = sw_lerp_vertex(v0, v2, t1); \
end = sw_lerp_vertex(v0, v1, t2); \
start.screen[0] = xLeft; \
start.screen[1] = (float)y; \
end.screen[0] = xRight; \
end.screen[1] = (float)y; \
\
if (xLeft > xRight) { sw_vertex_t tmp = start; start = end; end = tmp; } \
FUNC_SCANLINE(tex, &start, &end, yDu, yDv); \
\
/* Incremental update */ \
xLeft += dx02; \
xRight += dx01; \
} \
\
/* Scanline for the lower part of the triangle */ \
xRight = x1; /* Restart the right side from the second vertex */ \
for (int y = yMiddle; y < yBottom; y++) { \
float dy = (float)y - y0; \
float t1 = dy * inv_height; \
float t2 = (float)(y - y1) * inv_y2y1; \
\
/* Vertex interpolation */ \
start = sw_lerp_vertex(v0, v2, t1); \
end = sw_lerp_vertex(v1, v2, t2); \
start.screen[0] = xLeft; \
start.screen[1] = (float)y; \
end.screen[0] = xRight; \
end.screen[1] = (float)y; \
\
if (xLeft > xRight) { sw_vertex_t tmp = start; start = end; end = tmp; } \
FUNC_SCANLINE(tex, &start, &end, yDu, yDv); \
\
/* Incremental update */ \
xLeft += dx02; \
xRight += dx12; \
} \
}
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline, 0, 0, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX, 1, 0, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_DEPTH, 0, 1, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_BLEND, 0, 0, 1)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX_DEPTH, 1, 1, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX_BLEND, 1, 0, 1)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_DEPTH_BLEND, 0, 1, 1)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX_DEPTH_BLEND, 1, 1, 1)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster, sw_triangle_raster_scanline, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX, sw_triangle_raster_scanline_TEX, true)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_DEPTH, sw_triangle_raster_scanline_DEPTH, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_BLEND, sw_triangle_raster_scanline_BLEND, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH, sw_triangle_raster_scanline_TEX_DEPTH, true)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX_BLEND, sw_triangle_raster_scanline_TEX_BLEND, true)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_DEPTH_BLEND, sw_triangle_raster_scanline_DEPTH_BLEND, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH_BLEND, sw_triangle_raster_scanline_TEX_DEPTH_BLEND, true)
static inline void sw_triangle_render(const sw_vertex_t* v0, const sw_vertex_t* v1, const sw_vertex_t* v2)
{
int vertexCounter = 3;
sw_vertex_t polygon[SW_MAX_CLIPPED_POLYGON_VERTICES];
polygon[0] = *v0;
polygon[1] = *v1;
polygon[2] = *v2;
sw_triangle_project_and_clip(polygon, &vertexCounter);
if (vertexCounter < 3) {
return;
}
# define TRIANGLE_RASTER(RASTER_FUNC) \
{ \
for (int i = 0; i < vertexCounter - 2; i++) { \
RASTER_FUNC( \
&polygon[0], &polygon[i + 1], &polygon[i + 2], \
&RLSW.loadedTextures[RLSW.currentTexture] \
); \
} \
}
if (SW_STATE_CHECK(SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) {
TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH_BLEND)
}
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) {
TRIANGLE_RASTER(sw_triangle_raster_DEPTH_BLEND)
}
else if (SW_STATE_CHECK(SW_STATE_TEXTURE_2D | SW_STATE_BLEND)) {
TRIANGLE_RASTER(sw_triangle_raster_TEX_BLEND)
}
else if (SW_STATE_CHECK(SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST)) {
TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH)
}
else if (SW_STATE_CHECK(SW_STATE_BLEND)) {
TRIANGLE_RASTER(sw_triangle_raster_BLEND)
}
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) {
TRIANGLE_RASTER(sw_triangle_raster_DEPTH)
}
else if (SW_STATE_CHECK(SW_STATE_TEXTURE_2D)) {
TRIANGLE_RASTER(sw_triangle_raster_TEX)
}
else {
TRIANGLE_RASTER(sw_triangle_raster)
}
}
/* === Line Rendering Part === */
uint8_t sw_line_clip_encode_2d(const float screen[2], int xMin, int yMin, int xMax, int yMax)
{
uint8_t code = SW_CLIP_INSIDE;
if (screen[0] < xMin) code |= SW_CLIP_LEFT;
if (screen[0] > xMax) code |= SW_CLIP_RIGHT;
if (screen[1] < yMin) code |= SW_CLIP_TOP;
if (screen[1] > yMax) code |= SW_CLIP_BOTTOM;
return code;
}
bool sw_line_clip_2d(sw_vertex_t* v1, sw_vertex_t* v2)
{
int xMin = RLSW.vpMin[0];
int yMin = RLSW.vpMin[1];
int xMax = RLSW.vpMax[0];
int yMax = RLSW.vpMax[1];
bool accept = false;
uint8_t code0, code1;
float m = 0;
if (v1->screen[0] != v2->screen[0]) {
m = (v2->screen[1] - v1->screen[1]) / (v2->screen[0] - v1->screen[0]);
}
for (;;) {
code0 = sw_line_clip_encode_2d(v1->screen, xMin, yMin, xMax, yMax);
code1 = sw_line_clip_encode_2d(v2->screen, xMin, yMin, xMax, yMax);
// Accepted if both endpoints lie within rectangle
if ((code0 | code1) == 0) {
accept = true;
break;
}
// Rejected if both endpoints are outside rectangle, in same region
if (code0 & code1) break;
if (code0 == SW_CLIP_INSIDE) {
uint8_t ctmp = code0; code0 = code1; code1 = ctmp;
sw_vertex_t vtmp = *v1; *v1 = *v2; *v2 = vtmp;
}
if (code0 & SW_CLIP_LEFT) {
v1->screen[1] += (RLSW.vpMin[0] - v1->screen[0])*m;
v1->screen[0] = (float)RLSW.vpMin[0];
}
else if (code0 & SW_CLIP_RIGHT) {
v1->screen[1] += (RLSW.vpMax[0] - v1->screen[0])*m;
v1->screen[0] = (float)RLSW.vpMax[0];
}
else if (code0 & SW_CLIP_BOTTOM) {
if (m) v1->screen[0] += (RLSW.vpMin[1] - v1->screen[1]) / m;
v1->screen[1] = (float)RLSW.vpMin[1];
}
else if (code0 & SW_CLIP_TOP) {
if (m) v1->screen[0] += (RLSW.vpMax[1] - v1->screen[1]) / m;
v1->screen[1] = (float)RLSW.vpMax[1];
}
}
return accept;
}
bool sw_line_clip_coord_3d(float q, float p, float* t1, float* t2)
{
if (fabsf(p) < SW_CLIP_EPSILON) {
// Check if the line is entirely outside the window
if (q < -SW_CLIP_EPSILON) return 0; // Completely outside
return 1; // Completely inside or on the edges
}
const float r = q / p;
if (p < 0) {
if (r > *t2) return 0;
if (r > *t1) *t1 = r;
} else {
if (r < *t1) return 0;
if (r < *t2) *t2 = r;
}
return 1;
}
bool sw_line_clip_3d(sw_vertex_t* v1, sw_vertex_t* v2)
{
// TODO: Lerp all vertices here, not just homogeneous coordinates
float t1 = 0, t2 = 1;
float delta[4];
for (int i = 0; i < 4; i++) {
delta[i] = v2->homogeneous[i] - v1->homogeneous[i];
}
if (!sw_line_clip_coord_3d(v1->homogeneous[3] - v1->homogeneous[0], -delta[3] + delta[0], &t1, &t2)) return false;
if (!sw_line_clip_coord_3d(v1->homogeneous[3] + v1->homogeneous[0], -delta[3] - delta[0], &t1, &t2)) return false;
if (!sw_line_clip_coord_3d(v1->homogeneous[3] - v1->homogeneous[1], -delta[3] + delta[1], &t1, &t2)) return false;
if (!sw_line_clip_coord_3d(v1->homogeneous[3] + v1->homogeneous[1], -delta[3] - delta[1], &t1, &t2)) return false;
if (!sw_line_clip_coord_3d(v1->homogeneous[3] - v1->homogeneous[2], -delta[3] + delta[2], &t1, &t2)) return false;
if (!sw_line_clip_coord_3d(v1->homogeneous[3] + v1->homogeneous[2], -delta[3] - delta[2], &t1, &t2)) return false;
if (t2 < 1) {
for (int i = 0; i < 4; i++) {
v2->homogeneous[i] = v1->homogeneous[i] + t2 * delta[i];
}
}
if (t1 > 0) {
for (int i = 0; i < 4; i++) {
v1->homogeneous[i] = v1->homogeneous[i] + t1 * delta[i];
}
}
return true;
}
bool sw_line_project_and_clip(sw_vertex_t* v0, sw_vertex_t* v1)
{
sw_vec4_transform(v0->homogeneous, v0->position, RLSW.matMVP);
sw_vec4_transform(v1->homogeneous, v1->position, RLSW.matMVP);
if (v0->homogeneous[3] == 1.0f && v1->homogeneous[3] == 1.0f) {
sw_project_ndc_to_screen(v0->screen, v0->homogeneous);
sw_project_ndc_to_screen(v1->screen, v1->homogeneous);
if (!sw_line_clip_2d(v0, v1)) {
return false;
}
}
else {
if (!sw_line_clip_3d(v0, v1)) {
return false;
}
// Convert XYZ coordinates to NDC
v0->homogeneous[3] = 1.0f / v0->homogeneous[3];
v1->homogeneous[3] = 1.0f / v1->homogeneous[3];
for (int i = 0; i < 3; i++) {
v0->homogeneous[i] *= v0->homogeneous[3];
v1->homogeneous[i] *= v1->homogeneous[3];
}
// Convert NDC coordinates to screen space
sw_project_ndc_to_screen(v0->screen, v0->homogeneous);
sw_project_ndc_to_screen(v1->screen, v1->homogeneous);
}
return true;
}
#define DEFINE_LINE_RASTER(FUNC_NAME, ENABLE_DEPTH_TEST, ENABLE_COLOR_BLEND) \
void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1) \
{ \
int x1 = (int)v0->screen[0]; \
int y1 = (int)v0->screen[1]; \
int x2 = (int)v1->screen[0]; \
int y2 = (int)v1->screen[1]; \
\
float z1 = v0->homogeneous[2]; \
float z2 = v1->homogeneous[2]; \
\
int shortLen = y2 - y1; \
int longLen = x2 - x1; \
bool yLonger = 0; \
\
if (abs(shortLen) > abs(longLen)) { \
int tmp = shortLen; \
shortLen = longLen; \
longLen = tmp; \
yLonger = 1; \
} \
\
float invEndVal = 1.0f / longLen; \
int endVal = longLen; \
int sgnInc = 1; \
\
if (longLen < 0) { \
longLen = -longLen; \
sgnInc = -1; \
} \
\
int decInc = (longLen == 0) ? 0 \
: (shortLen << 16) / longLen; \
\
const int fbWidth = RLSW.framebuffer.width; \
const float zDiff = z2 - z1; \
\
uint8_t* colorBuffer = RLSW.framebuffer.color; \
uint16_t* depthBuffer = RLSW.framebuffer.depth; \
\
int j = 0; \
if (yLonger) { \
for (int i = 0; i != endVal; i += sgnInc, j += decInc) { \
float t = (float)i * invEndVal; \
\
int x = x1 + (j >> 16); \
int y = y1 + i; \
float z = z1 + t * zDiff; \
int pixel_index = y * fbWidth + x; \
\
uint16_t* dptr = &depthBuffer[pixel_index]; \
if (ENABLE_DEPTH_TEST) { \
float depth = (float)(*dptr) / UINT16_MAX; \
if (z > depth) continue; \
} \
\
*dptr = (uint16_t)(z * UINT16_MAX); \
\
int color_index = 4 * pixel_index; \
uint8_t* cptr = &colorBuffer[color_index]; \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4]; \
float srcColor[4]; \
for (int j = 0; j < 4; j++) { \
dstColor[j] = (float)cptr[i] / 255; \
srcColor[j] = sw_lerp(v0->color[j], v1->color[j], t); \
} \
sw_blend_colors(dstColor, srcColor); \
for (int j = 0; j < 4; j++) { \
cptr[j] = (uint8_t)(dstColor[j] * 255); \
} \
} \
else \
{ \
for (int j = 0; j < 4; j++) { \
float finalColor = sw_lerp(v0->color[j], v1->color[j], t); \
cptr[j] = (uint8_t)(finalColor * 255); \
} \
} \
} \
} \
else { \
for (int i = 0; i != endVal; i += sgnInc, j += decInc) { \
float t = (float)i * invEndVal; \
\
int x = x1 + i; \
int y = y1 + (j >> 16); \
float z = z1 + t * zDiff; \
int pixel_index = y * fbWidth + x; \
\
uint16_t* dptr = &depthBuffer[pixel_index]; \
if (ENABLE_DEPTH_TEST) { \
float depth = (float)(*dptr) / UINT16_MAX; \
if (z > depth) continue; \
} \
\
*dptr = (uint16_t)(z * UINT16_MAX); \
\
int color_index = 4 * pixel_index; \
uint8_t* cptr = &colorBuffer[color_index]; \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4]; \
float srcColor[4]; \
for (int j = 0; j < 4; j++) { \
dstColor[j] = (float)cptr[i] / 255; \
srcColor[j] = sw_lerp(v0->color[j], v1->color[j], t); \
} \
sw_blend_colors(dstColor, srcColor); \
for (int j = 0; j < 4; j++) { \
cptr[j] = (uint8_t)(dstColor[j] * 255); \
} \
} \
else \
{ \
for (int j = 0; j < 4; j++) { \
float finalColor = sw_lerp(v0->color[j], v1->color[j], t); \
cptr[j] = (uint8_t)(finalColor * 255); \
} \
} \
} \
} \
}
DEFINE_LINE_RASTER(sw_line_raster, 0, 0)
DEFINE_LINE_RASTER(sw_line_raster_DEPTH, 1, 0)
DEFINE_LINE_RASTER(sw_line_raster_BLEND, 0, 1)
DEFINE_LINE_RASTER(sw_line_raster_DEPTH_BLEND, 1, 1)
static inline void sw_line_render(sw_vertex_t* v0, sw_vertex_t* v1)
{
if (!sw_line_project_and_clip(v0, v1)) {
return;
}
if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) {
sw_line_raster_DEPTH_BLEND(v0, v1);
}
else if (SW_STATE_CHECK(SW_STATE_BLEND)) {
sw_line_raster_BLEND(v0, v1);
}
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) {
sw_line_raster_DEPTH(v0, v1);
}
else {
sw_line_raster(v0, v1);
}
}
/* === Some Validity Check Helper === */
static inline bool sw_is_texture_id_valid(uint32_t id)
{
bool valid = true;
if (id == 0) valid = false;
else if (id >= SW_MAX_TEXTURES) valid = false;
else if (RLSW.loadedTextures[id].pixels == 0) valid = false;
return true;
}
static inline bool sw_is_texture_filter_valid(int filter)
{
return (filter == SW_NEAREST || filter == SW_LINEAR);
}
static inline bool sw_is_texture_wrap_valid(int wrap)
{
return (wrap == SW_REPEAT || wrap == SW_CLAMP_TO_EDGE || SW_MIRRORED_REPEAT);
}
static inline bool sw_is_face_valid(int face)
{
return (face == SW_FRONT || face == SW_BACK);
}
static inline bool sw_is_blend_src_factor_valid(int blend)
{
bool result = false;
switch (blend) {
case SW_ZERO:
case SW_ONE:
case SW_SRC_COLOR:
case SW_ONE_MINUS_SRC_COLOR:
case SW_SRC_ALPHA:
case SW_ONE_MINUS_SRC_ALPHA:
case SW_DST_ALPHA:
case SW_ONE_MINUS_DST_ALPHA:
case SW_DST_COLOR:
case SW_ONE_MINUS_DST_COLOR:
case SW_SRC_ALPHA_SATURATE:
result = true;
break;
default:
break;
}
return result;
}
static inline bool sw_is_blend_dst_factor_valid(int blend)
{
bool result = false;
switch (blend) {
case SW_ZERO:
case SW_ONE:
case SW_SRC_COLOR:
case SW_ONE_MINUS_SRC_COLOR:
case SW_SRC_ALPHA:
case SW_ONE_MINUS_SRC_ALPHA:
case SW_DST_ALPHA:
case SW_ONE_MINUS_DST_ALPHA:
case SW_DST_COLOR:
case SW_ONE_MINUS_DST_COLOR:
result = true;
break;
default:
break;
}
return result;
}
/* === Public Implementation === */
void swInit(int w, int h)
{
swViewport(0, 0, w, h);
RLSW.framebuffer.color = SW_MALLOC(4 * w * h);
RLSW.framebuffer.depth = SW_MALLOC(2 * w * h);
RLSW.framebuffer.width = w;
RLSW.framebuffer.height = h;
RLSW.loadedTextures = SW_MALLOC(SW_MAX_TEXTURES);
RLSW.freeTextureIds = SW_MALLOC(SW_MAX_TEXTURES);
RLSW.clearColor[0] = 0;
RLSW.clearColor[1] = 0;
RLSW.clearColor[2] = 0;
RLSW.clearColor[3] = 255;
RLSW.clearDepth = UINT16_MAX;
RLSW.currentMatrixMode = SW_MODELVIEW;
RLSW.currentMatrix = &RLSW.matView;
sw_matrix_id(RLSW.matProjection);
sw_matrix_id(RLSW.matTexture);
sw_matrix_id(RLSW.matModel);
sw_matrix_id(RLSW.matView);
RLSW.vertexBuffer[0].color[0] = 1.0f;
RLSW.vertexBuffer[0].color[1] = 1.0f;
RLSW.vertexBuffer[0].color[2] = 1.0f;
RLSW.vertexBuffer[0].color[3] = 1.0f;
RLSW.vertexBuffer[0].texcoord[0] = 0.0f;
RLSW.vertexBuffer[0].texcoord[1] = 0.0f;
RLSW.vertexBuffer[0].normal[0] = 0.0f;
RLSW.vertexBuffer[0].normal[1] = 0.0f;
RLSW.vertexBuffer[0].normal[2] = 1.0f;
RLSW.srcFactor = SW_SRC_ALPHA;
RLSW.dstFactor = SW_ONE_MINUS_SRC_ALPHA;
RLSW.cullFace = SW_BACK;
static const float defTex[3*2*2] =
{
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
};
RLSW.loadedTextures[0].pixels = defTex;
RLSW.loadedTextures[0].width = 2;
RLSW.loadedTextures[0].height = 2;
RLSW.loadedTextures[0].format = SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32;
RLSW.loadedTextures[0].minFilter = SW_NEAREST;
RLSW.loadedTextures[0].magFilter = SW_NEAREST;
RLSW.loadedTextures[0].sWrap = SW_REPEAT;
RLSW.loadedTextures[0].tWrap = SW_REPEAT;
RLSW.loadedTextures[0].tx = 0.5f;
RLSW.loadedTextures[0].ty = 0.5f;
RLSW.loadedTextureCount = 1;
}
void swClose(void)
{
SW_FREE(RLSW.framebuffer.color);
SW_FREE(RLSW.framebuffer.depth);
SW_FREE(RLSW.loadedTextures);
SW_FREE(RLSW.freeTextureIds);
}
void swEnable(SWstate state)
{
switch (state) {
case SW_TEXTURE_2D:
RLSW.stateFlags |= SW_STATE_TEXTURE_2D;
break;
case SW_DEPTH_TEST:
RLSW.stateFlags |= SW_STATE_DEPTH_TEST;
break;
case SW_CULL_FACE:
RLSW.stateFlags |= SW_STATE_CULL_FACE;
break;
case SW_BLEND:
RLSW.stateFlags |= SW_STATE_BLEND;
break;
default:
RLSW.errCode = SW_INVALID_ENUM;
break;
}
}
void swDisable(SWstate state)
{
switch (state) {
case SW_TEXTURE_2D:
RLSW.stateFlags &= ~SW_STATE_TEXTURE_2D;
break;
case SW_DEPTH_TEST:
RLSW.stateFlags &= ~SW_STATE_DEPTH_TEST;
break;
case SW_CULL_FACE:
RLSW.stateFlags &= ~SW_STATE_CULL_FACE;
break;
case SW_BLEND:
RLSW.stateFlags &= ~SW_STATE_BLEND;
break;
default:
RLSW.errCode = SW_INVALID_ENUM;
break;
}
}
void* swGetColorBuffer(int* w, int* h)
{
if (w) *w = RLSW.framebuffer.width;
if (h) *h = RLSW.framebuffer.height;
return RLSW.framebuffer.color;
}
void swMatrixMode(SWmatrix mode)
{
switch (mode) {
case SW_PROJECTION:
RLSW.currentMatrix = &RLSW.matProjection;
break;
case SW_MODELVIEW:
RLSW.currentMatrix = RLSW.modelMatrixUsed
? &RLSW.matModel : &RLSW.matView;
break;
case SW_TEXTURE:
RLSW.currentMatrix = &RLSW.matTexture;
break;
default:
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.currentMatrixMode = mode;
}
void swPushMatrix(void)
{
switch (RLSW.currentMatrixMode) {
case SW_PROJECTION:
if (RLSW.stackProjectionCounter >= SW_MAX_PROJECTION_STACK_SIZE) {
RLSW.errCode = SW_STACK_OVERFLOW;
return;
}
for (int i = 0; i < 16; i++) {
RLSW.stackProjection[RLSW.stackProjectionCounter][i] = RLSW.matProjection[i];
}
RLSW.stackProjectionCounter++;
break;
case SW_MODELVIEW:
if (RLSW.stackModelviewCounter >= SW_MAX_MODELVIEW_STACK_SIZE) {
RLSW.errCode = SW_STACK_OVERFLOW;
return;
}
if (RLSW.modelMatrixUsed) {
for (int i = 0; i < 16; i++) {
RLSW.stackModelview[RLSW.stackModelviewCounter][i] = RLSW.matModel[i];
}
RLSW.stackModelviewCounter++;
} else {
RLSW.currentMatrix = &RLSW.matModel;
RLSW.modelMatrixUsed = true;
}
break;
case SW_TEXTURE:
if (RLSW.stackTextureCounter >= SW_MAX_TEXTURE_STACK_SIZE) {
RLSW.errCode = SW_STACK_OVERFLOW;
return;
}
for (int i = 0; i < 16; i++) {
RLSW.stackTexture[RLSW.stackTextureCounter][i] = RLSW.matTexture[i];
}
RLSW.stackTextureCounter++;
break;
}
}
void swPopMatrix(void)
{
switch (RLSW.currentMatrixMode) {
case SW_PROJECTION:
if (RLSW.stackProjectionCounter <= 0) {
RLSW.errCode = SW_STACK_UNDERFLOW;
return;
}
RLSW.stackProjectionCounter--;
for (int i = 0; i < 16; i++) {
RLSW.matProjection[i] = RLSW.stackProjection[RLSW.stackProjectionCounter][i];
}
break;
case SW_MODELVIEW:
if (RLSW.stackModelviewCounter == 0) {
if (!RLSW.modelMatrixUsed) {
RLSW.errCode = SW_STACK_UNDERFLOW;
return;
}
sw_matrix_id(RLSW.matModel);
RLSW.currentMatrix = &RLSW.matView;
RLSW.modelMatrixUsed = false;
} else {
RLSW.stackModelviewCounter--;
for (int i = 0; i < 16; i++) {
RLSW.matModel[i] = RLSW.stackModelview[RLSW.stackModelviewCounter][i];
}
}
break;
case SW_TEXTURE:
if (RLSW.stackTextureCounter <= 0) {
RLSW.errCode = SW_STACK_UNDERFLOW;
return;
}
RLSW.stackTextureCounter--;
for (int i = 0; i < 16; i++) {
RLSW.matTexture[i] = RLSW.stackTexture[RLSW.stackTextureCounter][i];
}
break;
}
}
void swLoadIdentity(void)
{
sw_matrix_id(*RLSW.currentMatrix);
}
void swTranslatef(float x, float y, float z)
{
sw_matrix_t mat;
sw_matrix_id(mat);
mat[12] = x;
mat[13] = y;
mat[14] = z;
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
}
void swRotatef(float angle, float x, float y, float z)
{
angle *= SW_DEG2RAD;
float lengthSq = x*x + y*y + z*z;
if (lengthSq != 1.0f && lengthSq != 0.0f) {
float invLength = 1.0f/sqrtf(lengthSq);
x *= invLength;
y *= invLength;
z *= invLength;
}
float sinres = sinf(angle);
float cosres = cosf(angle);
float t = 1.0f - cosres;
sw_matrix_t mat;
mat[0] = x*x*t + cosres;
mat[1] = y*x*t + z*sinres;
mat[2] = z*x*t - y*sinres;
mat[3] = 0.0f;
mat[4] = x*y*t - z*sinres;
mat[5] = y*y*t + cosres;
mat[6] = z*y*t + x*sinres;
mat[7] = 0.0f;
mat[8] = x*z*t + y*sinres;
mat[9] = y*z*t - x*sinres;
mat[10] = z*z*t + cosres;
mat[11] = 0.0f;
mat[12] = 0.0f;
mat[13] = 0.0f;
mat[14] = 0.0f;
mat[15] = 1.0f;
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
}
void swScalef(float x, float y, float z)
{
sw_matrix_t mat;
mat[0] = x, mat[1] = 0, mat[2] = 0, mat[3] = 0;
mat[4] = 0, mat[5] = y, mat[6] = 0, mat[7] = 0;
mat[8] = 0, mat[9] = 0, mat[10] = z, mat[11] = 0;
mat[12] = 0, mat[13] = 0, mat[14] = 0, mat[15] = 1;
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
}
void swMultMatrixf(const float* mat)
{
sw_matrix_mul(*RLSW.currentMatrix, *RLSW.currentMatrix, mat);
}
void swFrustum(double left, double right, double bottom, double top, double znear, double zfar)
{
sw_matrix_t mat;
double rl = right - left;
double tb = top - bottom;
double fn = zfar - znear;
mat[0] = (znear*2.0)/rl;
mat[1] = 0.0f;
mat[2] = 0.0f;
mat[3] = 0.0f;
mat[4] = 0.0f;
mat[5] = (znear*2.0)/tb;
mat[6] = 0.0f;
mat[7] = 0.0f;
mat[8] = (right + left)/rl;
mat[9] = (top + bottom)/tb;
mat[10] = -(zfar + znear)/fn;
mat[11] = -1.0f;
mat[12] = 0.0f;
mat[13] = 0.0f;
mat[14] = -(zfar*znear*2.0)/fn;
mat[15] = 0.0f;
sw_matrix_mul(*RLSW.currentMatrix, *RLSW.currentMatrix, mat);
}
void swOrtho(double left, double right, double bottom, double top, double znear, double zfar)
{
sw_matrix_t mat;
double rl = right - left;
double tb = top - bottom;
double fn = zfar - znear;
mat[0] = 2.0f/rl;
mat[1] = 0.0f;
mat[2] = 0.0f;
mat[3] = 0.0f;
mat[4] = 0.0f;
mat[5] = 2.0f/tb;
mat[6] = 0.0f;
mat[7] = 0.0f;
mat[8] = 0.0f;
mat[9] = 0.0f;
mat[10] = -2.0f/fn;
mat[11] = 0.0f;
mat[12] = -(left + right)/rl;
mat[13] = -(top + bottom)/tb;
mat[14] = -(zfar + znear)/fn;
mat[15] = 1.0f;
sw_matrix_mul(*RLSW.currentMatrix, *RLSW.currentMatrix, mat);
}
void swViewport(int x, int y, int width, int height)
{
if (x <= -width || y <= -height) {
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
RLSW.vpPos[0] = x;
RLSW.vpPos[1] = y;
RLSW.vpDim[0] = width - 1;
RLSW.vpDim[1] = height - 1;
RLSW.vpMin[0] = (x < 0) ? 0 : x;
RLSW.vpMin[1] = (y < 0) ? 0 : y;
int fbW = RLSW.framebuffer.width - 1;
int fbH = RLSW.framebuffer.height - 1;
int vpMaxX = x + width;
int vpMaxY = y + height;
RLSW.vpMax[0] = (vpMaxX < fbW) ? vpMaxX : fbW;
RLSW.vpMax[1] = (vpMaxY < fbH) ? vpMaxY : fbH;
}
void swClearColor(float r, float g, float b, float a)
{
RLSW.clearColor[0] = r * 255;
RLSW.clearColor[1] = g * 255;
RLSW.clearColor[2] = b * 255;
RLSW.clearColor[3] = a * 255;
}
void swClear(void)
{
int size = RLSW.framebuffer.width * RLSW.framebuffer.height;
for (int i = 0; i < size; i++) {
((uint32_t*)RLSW.framebuffer.color)[i] = *((uint32_t*)RLSW.clearColor);
RLSW.framebuffer.depth[i] = RLSW.clearDepth;
}
}
void swBlendFunc(SWfactor sfactor, SWfactor dfactor)
{
if (!sw_is_blend_src_factor_valid(sfactor)
|| !sw_is_blend_dst_factor_valid(dfactor)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.srcFactor = sfactor;
RLSW.dstFactor = dfactor;
}
void swCullFace(SWface face)
{
if (!sw_is_face_valid(face)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.cullFace = face;
}
void swBegin(SWdraw mode)
{
if (mode < SW_POINTS || mode > SW_QUADS) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.vertexCounter = 0;
RLSW.drawMode = mode;
}
void swEnd(void)
{
RLSW.vertexCounter = 0;
}
void swVertex2i(int x, int y)
{
float v[4] = { (float)x, (float)y, 0.0f, 1.0f };
swVertex4fv(v);
}
void swVertex2f(float x, float y)
{
float v[4] = { x, y, 0.0f, 1.0f };
swVertex4fv(v);
}
void swVertex2fv(const float* v)
{
float v4[4] = { v[0], v[1], 0.0f, 1.0f };
swVertex4fv(v4);
}
void swVertex3i(int x, int y, int z)
{
float v[4] = { (float)x, (float)y, (float)z, 1.0f };
swVertex4fv(v);
}
void swVertex3f(float x, float y, float z)
{
float v[4] = { x, y, z, 1.0f };
swVertex4fv(v);
}
void swVertex3fv(const float* v)
{
float v4[4] = { v[0], v[1], v[2], 1.0f };
swVertex4fv(v4);
}
void swVertex4i(int x, int y, int z, int w)
{
float v[4] = { (float)x, (float)y, (float)z, (float)w };
swVertex4fv(v);
}
void swVertex4f(float x, float y, float z, float w)
{
float v[4] = { x, y, z, w };
swVertex4fv(v);
}
void swVertex4fv(const float* v)
{
for (int i = 0; i < 4; i++) {
RLSW.vertexBuffer[RLSW.vertexCounter].position[i] = v[i];
}
RLSW.vertexCounter++;
int neededVertices = 0;
switch (RLSW.drawMode) {
case SW_POINTS:
neededVertices = 1;
break;
case SW_LINES:
neededVertices = 2;
break;
case SW_TRIANGLES:
neededVertices = 3;
break;
case SW_QUADS:
neededVertices = 4;
break;
}
if (RLSW.vertexCounter == neededVertices) {
// TODO: Optimize MVP calculation
sw_matrix_mul(RLSW.matMVP, RLSW.matModel, RLSW.matView);
sw_matrix_mul(RLSW.matMVP, RLSW.matMVP, RLSW.matProjection);
switch (RLSW.drawMode) {
case SW_POINTS:
break;
case SW_LINES:
sw_line_render(
&RLSW.vertexBuffer[0],
&RLSW.vertexBuffer[1]
);
break;
case SW_TRIANGLES:
sw_triangle_render(
&RLSW.vertexBuffer[0],
&RLSW.vertexBuffer[1],
&RLSW.vertexBuffer[2]
);
break;
case SW_QUADS:
sw_triangle_render(
&RLSW.vertexBuffer[0],
&RLSW.vertexBuffer[1],
&RLSW.vertexBuffer[2]
);
sw_triangle_render(
&RLSW.vertexBuffer[2],
&RLSW.vertexBuffer[3],
&RLSW.vertexBuffer[0]
);
break;
}
RLSW.vertexBuffer[0] = RLSW.vertexBuffer[neededVertices - 1];
RLSW.vertexCounter = 0;
}
else {
RLSW.vertexBuffer[RLSW.vertexCounter] = RLSW.vertexBuffer[RLSW.vertexCounter - 1];
}
}
void swColor1ui(uint32_t color)
{
union {
uint32_t v;
uint8_t a[4];
} c = { .v = color };
float cv[4];
cv[0] = (float)c.a[0] / 255;
cv[1] = (float)c.a[1] / 255;
cv[2] = (float)c.a[2] / 255;
cv[3] = (float)c.a[3] / 255;
swColor4fv(cv);
}
void swColor3ub(uint8_t r, uint8_t g, uint8_t b)
{
float cv[4];
cv[0] = (float)r / 255;
cv[1] = (float)g / 255;
cv[2] = (float)b / 255;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3ubv(const uint8_t* v)
{
float cv[4];
cv[0] = (float)v[0] / 255;
cv[1] = (float)v[1] / 255;
cv[2] = (float)v[2] / 255;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3us(uint16_t r, uint16_t g, uint16_t b)
{
float cv[4];
cv[0] = (float)((uint8_t)(r >> 8)) / 255;
cv[1] = (float)((uint8_t)(g >> 8)) / 255;
cv[2] = (float)((uint8_t)(b >> 8)) / 255;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3usv(const uint16_t* v)
{
float cv[4];
cv[0] = (float)((uint8_t)(v[0] >> 8)) / 255;
cv[1] = (float)((uint8_t)(v[1] >> 8)) / 255;
cv[2] = (float)((uint8_t)(v[2] >> 8)) / 255;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3ui(uint32_t r, uint32_t g, uint32_t b)
{
float cv[4];
cv[0] = (float)((uint8_t)(r >> 24)) / 255;
cv[1] = (float)((uint8_t)(g >> 24)) / 255;
cv[2] = (float)((uint8_t)(b >> 24)) / 255;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3uiv(const uint32_t* v)
{
float cv[4];
cv[0] = (float)((uint8_t)(v[0] >> 24)) / 255;
cv[1] = (float)((uint8_t)(v[1] >> 24)) / 255;
cv[2] = (float)((uint8_t)(v[2] >> 24)) / 255;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3f(float r, float g, float b)
{
float cv[4];
cv[0] = r;
cv[1] = g;
cv[2] = b;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3fv(const float* v)
{
float cv[4];
cv[0] = v[0];
cv[1] = v[1];
cv[2] = v[2];
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor4ub(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
float cv[4];
cv[0] = (float)r / 255;
cv[1] = (float)g / 255;
cv[2] = (float)b / 255;
cv[3] = (float)a / 255;
swColor4fv(cv);
}
void swColor4ubv(const uint8_t* v)
{
float cv[4];
cv[0] = (float)v[0] / 255;
cv[1] = (float)v[1] / 255;
cv[2] = (float)v[2] / 255;
cv[3] = (float)v[3] / 255;
swColor4fv(cv);
}
void swColor4us(uint16_t r, uint16_t g, uint16_t b, uint16_t a)
{
float cv[4];
cv[0] = (float)((uint8_t)(r >> 8)) / 255;
cv[1] = (float)((uint8_t)(g >> 8)) / 255;
cv[2] = (float)((uint8_t)(b >> 8)) / 255;
cv[3] = (float)((uint8_t)(a >> 8)) / 255;
swColor4fv(cv);
}
void swColor4usv(const uint16_t* v)
{
float cv[4];
cv[0] = (float)((uint8_t)(v[0] >> 8)) / 255;
cv[1] = (float)((uint8_t)(v[1] >> 8)) / 255;
cv[2] = (float)((uint8_t)(v[2] >> 8)) / 255;
cv[3] = (float)((uint8_t)(v[3] >> 8)) / 255;
swColor4fv(cv);
}
void swColor4ui(uint32_t r, uint32_t g, uint32_t b, uint32_t a)
{
float cv[4];
cv[0] = (float)((uint8_t)(r >> 24)) / 255;
cv[1] = (float)((uint8_t)(g >> 24)) / 255;
cv[2] = (float)((uint8_t)(b >> 24)) / 255;
cv[3] = (float)((uint8_t)(a >> 24)) / 255;
swColor4fv(cv);
}
void swColor4uiv(const uint32_t* v)
{
float cv[4];
cv[0] = (float)((uint8_t)(v[0] >> 24)) / 255;
cv[1] = (float)((uint8_t)(v[1] >> 24)) / 255;
cv[2] = (float)((uint8_t)(v[2] >> 24)) / 255;
cv[3] = (float)((uint8_t)(v[3] >> 24)) / 255;
swColor4fv(cv);
}
void swColor4f(float r, float g, float b, float a)
{
float cv[4];
cv[0] = r;
cv[1] = g;
cv[2] = b;
cv[3] = a;
swColor4fv(cv);
}
void swColor4fv(const float* v)
{
for (int i = 0; i < 4; i++) {
RLSW.vertexBuffer[RLSW.vertexCounter].color[i] = v[i];
}
}
void swTexCoord2f(float u, float v)
{
float s = RLSW.matTexture[0]*u + RLSW.matTexture[4]*v + RLSW.matTexture[12];
float t = RLSW.matTexture[1]*u + RLSW.matTexture[5]*v + RLSW.matTexture[13];
RLSW.vertexBuffer[RLSW.vertexCounter].texcoord[0] = s;
RLSW.vertexBuffer[RLSW.vertexCounter].texcoord[1] = t;
}
void swTexCoordfv(const float* v)
{
float s = RLSW.matTexture[0]*v[0] + RLSW.matTexture[4]*v[1] + RLSW.matTexture[12];
float t = RLSW.matTexture[1]*v[0] + RLSW.matTexture[5]*v[1] + RLSW.matTexture[13];
RLSW.vertexBuffer[RLSW.vertexCounter].texcoord[0] = s;
RLSW.vertexBuffer[RLSW.vertexCounter].texcoord[1] = t;
}
void swNormal3f(float x, float y, float z)
{
RLSW.vertexBuffer[RLSW.vertexCounter].normal[0] = x;
RLSW.vertexBuffer[RLSW.vertexCounter].normal[1] = y;
RLSW.vertexBuffer[RLSW.vertexCounter].normal[2] = z;
}
void swNormal3fv(const float* v)
{
RLSW.vertexBuffer[RLSW.vertexCounter].normal[0] = v[0];
RLSW.vertexBuffer[RLSW.vertexCounter].normal[1] = v[1];
RLSW.vertexBuffer[RLSW.vertexCounter].normal[2] = v[2];
}
void swBindArray(SWarray type, void *buffer)
{
switch (type) {
case SW_VERTEX_ARRAY:
RLSW.array.positions = buffer;
break;
case SW_TEXTURE_COORD_ARRAY:
RLSW.array.texcoords = buffer;
break;
case SW_NORMAL_ARRAY:
RLSW.array.normals = buffer;
break;
case SW_COLOR_ARRAY:
RLSW.array.colors = buffer;
break;
default:
break;
}
}
void swDrawArrays(SWdraw mode, int offset, int count)
{
if (RLSW.array.positions == 0) {
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
swBegin(mode);
for (int i = offset; i < count; i++) {
if (RLSW.array.texcoords) {
swTexCoordfv(RLSW.array.texcoords + 2 * i);
}
if (RLSW.array.normals) {
swNormal3fv(RLSW.array.normals + 3 * i);
}
if (RLSW.array.colors) {
swColor4ubv(RLSW.array.colors + 4 * i);
}
swVertex3fv(RLSW.array.positions + 3 * i);
}
swEnd();
}
uint32_t swLoadTexture(const void *data, int width, int height, int format, int mipmapCount)
{
if (RLSW.loadedTextureCount >= SW_MAX_TEXTURES) {
RLSW.errCode = SW_STACK_OVERFLOW; //< Out of memory, not really stack overflow
return 0;
}
sw_texture_t texture = { 0 };
texture.pixels = data;
texture.width = width;
texture.height = height;
texture.format = format;
texture.minFilter = SW_NEAREST;
texture.magFilter = SW_NEAREST;
texture.sWrap = SW_REPEAT;
texture.tWrap = SW_REPEAT;
texture.tx = 1.0f / width;
texture.ty = 1.0f / height;
(void)mipmapCount;
uint32_t id = 0;
if (RLSW.freeTextureIdCount > 0) {
id = RLSW.freeTextureIds[--RLSW.freeTextureIdCount];
}
else {
id = RLSW.loadedTextureCount++;
}
RLSW.loadedTextures[id] = texture;
return id;
}
void swUnloadTexture(uint32_t id)
{
if (!sw_is_texture_id_valid(id)) {
RLSW.errCode = SW_INVALID_VALUE;
return;
}
RLSW.loadedTextures[id].pixels = 0;
RLSW.freeTextureIds[RLSW.freeTextureIdCount++] = id;
}
void swTextureParameters(uint32_t id, int param, int value)
{
if (!sw_is_texture_id_valid(id)) {
RLSW.errCode = SW_INVALID_VALUE;
return;
}
sw_texture_t* texture = &RLSW.loadedTextures[id];
switch (param) {
case SW_TEXTURE_MIN_FILTER:
if (!sw_is_texture_filter_valid(value)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->minFilter = value;
break;
case SW_TEXTURE_MAG_FILTER:
if (!sw_is_texture_filter_valid(value)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->magFilter = value;
break;
case SW_TEXTURE_WRAP_S:
if (!sw_is_texture_wrap_valid(value)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->sWrap = value;
break;
case SW_TEXTURE_WRAP_T:
if (!sw_is_texture_wrap_valid(value)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->tWrap = value;
break;
default:
RLSW.errCode = SW_INVALID_ENUM;
return;
}
}
void swBindTexture(uint32_t id)
{
if (id >= SW_MAX_TEXTURES) {
RLSW.errCode = SW_INVALID_VALUE;
return;
}
if (id > 0 && RLSW.loadedTextures[id].pixels == 0) {
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
RLSW.currentTexture = id;
}
#endif // RLSW_IMPL