Não pode escolher mais do que 25 tópicos
Os tópicos devem começar com uma letra ou um número, podem incluir traços ('-') e podem ter até 35 caracteres.
348 linhas
16 KiB
348 linhas
16 KiB
/*******************************************************************************************
|
|
*
|
|
* raylib [shaders] example - deferred rendering
|
|
*
|
|
* Example complexity rating: [★★★★] 4/4
|
|
*
|
|
* NOTE: This example requires raylib OpenGL 3.3 or OpenGL ES 3.0
|
|
*
|
|
* Example originally created with raylib 4.5, last time updated with raylib 4.5
|
|
*
|
|
* Example contributed by Justin Andreas Lacoste (@27justin) and reviewed by Ramon Santamaria (@raysan5)
|
|
*
|
|
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
|
|
* BSD-like license that allows static linking with closed source software
|
|
*
|
|
* Copyright (c) 2023-2025 Justin Andreas Lacoste (@27justin)
|
|
*
|
|
********************************************************************************************/
|
|
|
|
#include "raylib.h"
|
|
|
|
#include "rlgl.h"
|
|
#include "raymath.h"
|
|
|
|
#define RLIGHTS_IMPLEMENTATION
|
|
#include "rlights.h"
|
|
|
|
#if defined(PLATFORM_DESKTOP)
|
|
#define GLSL_VERSION 330
|
|
#else // PLATFORM_ANDROID, PLATFORM_WEB
|
|
#define GLSL_VERSION 100
|
|
#endif
|
|
|
|
#include <stdlib.h> // Required for: NULL
|
|
|
|
#define MAX_CUBES 30
|
|
|
|
// GBuffer data
|
|
typedef struct GBuffer {
|
|
unsigned int framebuffer;
|
|
|
|
unsigned int positionTexture;
|
|
unsigned int normalTexture;
|
|
unsigned int albedoSpecTexture;
|
|
|
|
unsigned int depthRenderbuffer;
|
|
} GBuffer;
|
|
|
|
// Deferred mode passes
|
|
typedef enum {
|
|
DEFERRED_POSITION,
|
|
DEFERRED_NORMAL,
|
|
DEFERRED_ALBEDO,
|
|
DEFERRED_SHADING
|
|
} DeferredMode;
|
|
|
|
//------------------------------------------------------------------------------------
|
|
// Program main entry point
|
|
//------------------------------------------------------------------------------------
|
|
int main(void)
|
|
{
|
|
// Initialization
|
|
// -------------------------------------------------------------------------------------
|
|
const int screenWidth = 800;
|
|
const int screenHeight = 450;
|
|
|
|
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - deferred render");
|
|
|
|
Camera camera = { 0 };
|
|
camera.position = (Vector3){ 5.0f, 4.0f, 5.0f }; // Camera position
|
|
camera.target = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera looking at point
|
|
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
|
|
camera.fovy = 60.0f; // Camera field-of-view Y
|
|
camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
|
|
|
|
// Load plane model from a generated mesh
|
|
Model model = LoadModelFromMesh(GenMeshPlane(10.0f, 10.0f, 3, 3));
|
|
Model cube = LoadModelFromMesh(GenMeshCube(2.0f, 2.0f, 2.0f));
|
|
|
|
// Load geometry buffer (G-buffer) shader and deferred shader
|
|
Shader gbufferShader = LoadShader(TextFormat("resources/shaders/glsl%i/gbuffer.vs", GLSL_VERSION),
|
|
TextFormat("resources/shaders/glsl%i/gbuffer.fs", GLSL_VERSION));
|
|
|
|
Shader deferredShader = LoadShader(TextFormat("resources/shaders/glsl%i/deferred_shading.vs", GLSL_VERSION),
|
|
TextFormat("resources/shaders/glsl%i/deferred_shading.fs", GLSL_VERSION));
|
|
deferredShader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(deferredShader, "viewPosition");
|
|
|
|
// Initialize the G-buffer
|
|
GBuffer gBuffer = { 0 };
|
|
gBuffer.framebuffer = rlLoadFramebuffer();
|
|
|
|
if (!gBuffer.framebuffer)
|
|
{
|
|
TraceLog(LOG_WARNING, "Failed to create framebuffer");
|
|
exit(1);
|
|
}
|
|
|
|
rlEnableFramebuffer(gBuffer.framebuffer);
|
|
|
|
// NOTE: Vertex positions are stored in a texture for simplicity. A better approach would use a depth texture
|
|
// (instead of a detph renderbuffer) to reconstruct world positions in the final render shader via clip-space position,
|
|
// depth, and the inverse view/projection matrices.
|
|
|
|
// 16-bit precision ensures OpenGL ES 3 compatibility, though it may lack precision for real scenarios.
|
|
// But as mentioned above, the positions could be reconstructed instead of stored. If not targeting OpenGL ES
|
|
// and you wish to maintain this approach, consider using `RL_PIXELFORMAT_UNCOMPRESSED_R32G32B32`.
|
|
gBuffer.positionTexture = rlLoadTexture(NULL, screenWidth, screenHeight, RL_PIXELFORMAT_UNCOMPRESSED_R16G16B16, 1);
|
|
|
|
// Similarly, 16-bit precision is used for normals ensures OpenGL ES 3 compatibility.
|
|
// This is generally sufficient, but a 16-bit fixed-point format offer a better uniform precision in all orientations.
|
|
gBuffer.normalTexture = rlLoadTexture(NULL, screenWidth, screenHeight, RL_PIXELFORMAT_UNCOMPRESSED_R16G16B16, 1);
|
|
|
|
// Albedo (diffuse color) and specular strength can be combined into one texture.
|
|
// The color in RGB, and the specular strength in the alpha channel.
|
|
gBuffer.albedoSpecTexture = rlLoadTexture(NULL, screenWidth, screenHeight, RL_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, 1);
|
|
|
|
// Activate the draw buffers for our framebuffer
|
|
rlActiveDrawBuffers(3);
|
|
|
|
// Now we attach our textures to the framebuffer.
|
|
rlFramebufferAttach(gBuffer.framebuffer, gBuffer.positionTexture, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0);
|
|
rlFramebufferAttach(gBuffer.framebuffer, gBuffer.normalTexture, RL_ATTACHMENT_COLOR_CHANNEL1, RL_ATTACHMENT_TEXTURE2D, 0);
|
|
rlFramebufferAttach(gBuffer.framebuffer, gBuffer.albedoSpecTexture, RL_ATTACHMENT_COLOR_CHANNEL2, RL_ATTACHMENT_TEXTURE2D, 0);
|
|
|
|
// Finally we attach the depth buffer.
|
|
gBuffer.depthRenderbuffer = rlLoadTextureDepth(screenWidth, screenHeight, true);
|
|
rlFramebufferAttach(gBuffer.framebuffer, gBuffer.depthRenderbuffer, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
|
|
|
|
// Make sure our framebuffer is complete.
|
|
// NOTE: rlFramebufferComplete() automatically unbinds the framebuffer, so we don't have
|
|
// to rlDisableFramebuffer() here.
|
|
if (!rlFramebufferComplete(gBuffer.framebuffer))
|
|
{
|
|
TraceLog(LOG_WARNING, "Framebuffer is not complete");
|
|
}
|
|
|
|
// Now we initialize the sampler2D uniform's in the deferred shader.
|
|
// We do this by setting the uniform's values to the texture units that
|
|
// we later bind our g-buffer textures to.
|
|
rlEnableShader(deferredShader.id);
|
|
int texUnitPosition = 0;
|
|
int texUnitNormal = 1;
|
|
int texUnitAlbedoSpec = 2;
|
|
SetShaderValue(deferredShader, rlGetLocationUniform(deferredShader.id, "gPosition"), &texUnitPosition, RL_SHADER_UNIFORM_SAMPLER2D);
|
|
SetShaderValue(deferredShader, rlGetLocationUniform(deferredShader.id, "gNormal"), &texUnitNormal, RL_SHADER_UNIFORM_SAMPLER2D);
|
|
SetShaderValue(deferredShader, rlGetLocationUniform(deferredShader.id, "gAlbedoSpec"), &texUnitAlbedoSpec, RL_SHADER_UNIFORM_SAMPLER2D);
|
|
rlDisableShader();
|
|
|
|
// Assign out lighting shader to model
|
|
model.materials[0].shader = gbufferShader;
|
|
cube.materials[0].shader = gbufferShader;
|
|
|
|
// Create lights
|
|
//--------------------------------------------------------------------------------------
|
|
Light lights[MAX_LIGHTS] = { 0 };
|
|
lights[0] = CreateLight(LIGHT_POINT, (Vector3){ -2, 1, -2 }, Vector3Zero(), YELLOW, deferredShader);
|
|
lights[1] = CreateLight(LIGHT_POINT, (Vector3){ 2, 1, 2 }, Vector3Zero(), RED, deferredShader);
|
|
lights[2] = CreateLight(LIGHT_POINT, (Vector3){ -2, 1, 2 }, Vector3Zero(), GREEN, deferredShader);
|
|
lights[3] = CreateLight(LIGHT_POINT, (Vector3){ 2, 1, -2 }, Vector3Zero(), BLUE, deferredShader);
|
|
|
|
const float CUBE_SCALE = 0.25;
|
|
Vector3 cubePositions[MAX_CUBES] = { 0 };
|
|
float cubeRotations[MAX_CUBES] = { 0 };
|
|
|
|
for (int i = 0; i < MAX_CUBES; i++)
|
|
{
|
|
cubePositions[i] = (Vector3){
|
|
.x = (float)(rand()%10) - 5,
|
|
.y = (float)(rand()%5),
|
|
.z = (float)(rand()%10) - 5,
|
|
};
|
|
|
|
cubeRotations[i] = (float)(rand()%360);
|
|
}
|
|
|
|
DeferredMode mode = DEFERRED_SHADING;
|
|
|
|
rlEnableDepthTest();
|
|
|
|
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
|
|
//---------------------------------------------------------------------------------------
|
|
|
|
// Main game loop
|
|
while (!WindowShouldClose())
|
|
{
|
|
// Update
|
|
//----------------------------------------------------------------------------------
|
|
UpdateCamera(&camera, CAMERA_ORBITAL);
|
|
|
|
// Update the shader with the camera view vector (points towards { 0.0f, 0.0f, 0.0f })
|
|
float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
|
|
SetShaderValue(deferredShader, deferredShader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
|
|
|
|
// Check key inputs to enable/disable lights
|
|
if (IsKeyPressed(KEY_Y)) { lights[0].enabled = !lights[0].enabled; }
|
|
if (IsKeyPressed(KEY_R)) { lights[1].enabled = !lights[1].enabled; }
|
|
if (IsKeyPressed(KEY_G)) { lights[2].enabled = !lights[2].enabled; }
|
|
if (IsKeyPressed(KEY_B)) { lights[3].enabled = !lights[3].enabled; }
|
|
|
|
// Check key inputs to switch between G-buffer textures
|
|
if (IsKeyPressed(KEY_ONE)) mode = DEFERRED_POSITION;
|
|
if (IsKeyPressed(KEY_TWO)) mode = DEFERRED_NORMAL;
|
|
if (IsKeyPressed(KEY_THREE)) mode = DEFERRED_ALBEDO;
|
|
if (IsKeyPressed(KEY_FOUR)) mode = DEFERRED_SHADING;
|
|
|
|
// Update light values (actually, only enable/disable them)
|
|
for (int i = 0; i < MAX_LIGHTS; i++) UpdateLightValues(deferredShader, lights[i]);
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
// ---------------------------------------------------------------------------------
|
|
BeginDrawing();
|
|
|
|
// Draw to the geometry buffer by first activating it
|
|
rlEnableFramebuffer(gBuffer.framebuffer);
|
|
rlClearColor(0, 0, 0, 0);
|
|
rlClearScreenBuffers(); // Clear color and depth buffer
|
|
|
|
rlDisableColorBlend();
|
|
BeginMode3D(camera);
|
|
// NOTE: We have to use rlEnableShader here. `BeginShaderMode` or thus `rlSetShader`
|
|
// will not work, as they won't immediately load the shader program.
|
|
rlEnableShader(gbufferShader.id);
|
|
// When drawing a model here, make sure that the material's shaders
|
|
// are set to the gbuffer shader!
|
|
DrawModel(model, Vector3Zero(), 1.0f, WHITE);
|
|
DrawModel(cube, (Vector3) { 0.0, 1.0f, 0.0 }, 1.0f, WHITE);
|
|
|
|
for (int i = 0; i < MAX_CUBES; i++)
|
|
{
|
|
Vector3 position = cubePositions[i];
|
|
DrawModelEx(cube, position, (Vector3) { 1, 1, 1 }, cubeRotations[i], (Vector3) { CUBE_SCALE, CUBE_SCALE, CUBE_SCALE }, WHITE);
|
|
}
|
|
|
|
rlDisableShader();
|
|
EndMode3D();
|
|
rlEnableColorBlend();
|
|
|
|
// Go back to the default framebuffer (0) and draw our deferred shading.
|
|
rlDisableFramebuffer();
|
|
rlClearScreenBuffers(); // Clear color & depth buffer
|
|
|
|
switch (mode)
|
|
{
|
|
case DEFERRED_SHADING:
|
|
{
|
|
BeginMode3D(camera);
|
|
rlDisableColorBlend();
|
|
rlEnableShader(deferredShader.id);
|
|
// Bind our g-buffer textures
|
|
// We are binding them to locations that we earlier set in sampler2D uniforms `gPosition`, `gNormal`,
|
|
// and `gAlbedoSpec`
|
|
rlActiveTextureSlot(texUnitPosition);
|
|
rlEnableTexture(gBuffer.positionTexture);
|
|
rlActiveTextureSlot(texUnitNormal);
|
|
rlEnableTexture(gBuffer.normalTexture);
|
|
rlActiveTextureSlot(texUnitAlbedoSpec);
|
|
rlEnableTexture(gBuffer.albedoSpecTexture);
|
|
|
|
// Finally, we draw a fullscreen quad to our default framebuffer
|
|
// This will now be shaded using our deferred shader
|
|
rlLoadDrawQuad();
|
|
rlDisableShader();
|
|
rlEnableColorBlend();
|
|
EndMode3D();
|
|
|
|
// As a last step, we now copy over the depth buffer from our g-buffer to the default framebuffer.
|
|
rlBindFramebuffer(RL_READ_FRAMEBUFFER, gBuffer.framebuffer);
|
|
rlBindFramebuffer(RL_DRAW_FRAMEBUFFER, 0);
|
|
rlBlitFramebuffer(0, 0, screenWidth, screenHeight, 0, 0, screenWidth, screenHeight, 0x00000100); // GL_DEPTH_BUFFER_BIT
|
|
rlDisableFramebuffer();
|
|
|
|
// Since our shader is now done and disabled, we can draw spheres
|
|
// that represent light positions in default forward rendering
|
|
BeginMode3D(camera);
|
|
rlEnableShader(rlGetShaderIdDefault());
|
|
for (int i = 0; i < MAX_LIGHTS; i++)
|
|
{
|
|
if (lights[i].enabled) DrawSphereEx(lights[i].position, 0.2f, 8, 8, lights[i].color);
|
|
else DrawSphereWires(lights[i].position, 0.2f, 8, 8, ColorAlpha(lights[i].color, 0.3f));
|
|
}
|
|
rlDisableShader();
|
|
EndMode3D();
|
|
|
|
DrawText("FINAL RESULT", 10, screenHeight - 30, 20, DARKGREEN);
|
|
} break;
|
|
case DEFERRED_POSITION:
|
|
{
|
|
DrawTextureRec((Texture2D){
|
|
.id = gBuffer.positionTexture,
|
|
.width = screenWidth,
|
|
.height = screenHeight,
|
|
}, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, Vector2Zero(), RAYWHITE);
|
|
|
|
DrawText("POSITION TEXTURE", 10, screenHeight - 30, 20, DARKGREEN);
|
|
} break;
|
|
case DEFERRED_NORMAL:
|
|
{
|
|
DrawTextureRec((Texture2D){
|
|
.id = gBuffer.normalTexture,
|
|
.width = screenWidth,
|
|
.height = screenHeight,
|
|
}, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, Vector2Zero(), RAYWHITE);
|
|
|
|
DrawText("NORMAL TEXTURE", 10, screenHeight - 30, 20, DARKGREEN);
|
|
} break;
|
|
case DEFERRED_ALBEDO:
|
|
{
|
|
DrawTextureRec((Texture2D){
|
|
.id = gBuffer.albedoSpecTexture,
|
|
.width = screenWidth,
|
|
.height = screenHeight,
|
|
}, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, Vector2Zero(), RAYWHITE);
|
|
|
|
DrawText("ALBEDO TEXTURE", 10, screenHeight - 30, 20, DARKGREEN);
|
|
} break;
|
|
default: break;
|
|
}
|
|
|
|
DrawText("Toggle lights keys: [Y][R][G][B]", 10, 40, 20, DARKGRAY);
|
|
DrawText("Switch G-buffer textures: [1][2][3][4]", 10, 70, 20, DARKGRAY);
|
|
|
|
DrawFPS(10, 10);
|
|
|
|
EndDrawing();
|
|
// -----------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
UnloadModel(model); // Unload the models
|
|
UnloadModel(cube);
|
|
|
|
UnloadShader(deferredShader); // Unload shaders
|
|
UnloadShader(gbufferShader);
|
|
|
|
// Unload geometry buffer and all attached textures
|
|
rlUnloadFramebuffer(gBuffer.framebuffer);
|
|
rlUnloadTexture(gBuffer.positionTexture);
|
|
rlUnloadTexture(gBuffer.normalTexture);
|
|
rlUnloadTexture(gBuffer.albedoSpecTexture);
|
|
rlUnloadTexture(gBuffer.depthRenderbuffer);
|
|
|
|
CloseWindow(); // Close window and OpenGL context
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
}
|