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raylib-src
spogulis no https://github.com/raysan5/raylib


								/*******************************************************************************************

								*

								*   raylib [shaders] example - lightmap

								*

								*   NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,

								*         OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.

								*

								*   NOTE: Shaders used in this example are #version 330 (OpenGL 3.3).

								*

								*   Example contributed by Jussi Viitala (@nullstare) 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) 2019-2023 Jussi Viitala (@nullstare) and Ramon Santamaria (@raysan5)

								*

								********************************************************************************************/


								#include <stdio.h>

								#include <stdlib.h>


								#include "raylib.h"

								#include "raymath.h"

								#include "rlgl.h"


								#if defined(PLATFORM_DESKTOP)

								    #define GLSL_VERSION            330

								#else   // PLATFORM_ANDROID, PLATFORM_WEB

								    #define GLSL_VERSION            100

								#endif


								#define MAP_SIZE 10


								//------------------------------------------------------------------------------------

								// Program main entry point

								//------------------------------------------------------------------------------------

								int main(void)

								{

								    // Initialization

								    //--------------------------------------------------------------------------------------

								    const int screenWidth = 800;

								    const int screenHeight = 450;


								    SetConfigFlags(FLAG_MSAA_4X_HINT);  // Enable Multi Sampling Anti Aliasing 4x (if available)

								    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - lightmap");


								    // Define the camera to look into our 3d world

								    Camera camera = { 0 };

								    camera.position = (Vector3){ 4.0f, 6.0f, 8.0f };    // Camera position

								    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };      // Camera looking at point

								    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)

								    camera.fovy = 45.0f;                                // Camera field-of-view Y

								    camera.projection = CAMERA_PERSPECTIVE;             // Camera projection type


								    Mesh mesh = GenMeshPlane((float)MAP_SIZE, (float)MAP_SIZE, 1, 1);


								    // GenMeshPlane doesn't generate texcoords2 so we will upload them separately

								    mesh.texcoords2 = (float *)RL_MALLOC(mesh.vertexCount*2*sizeof(float));


								    // X                          // Y

								    mesh.texcoords2[0] = 0.0f;    mesh.texcoords2[1] = 0.0f;

								    mesh.texcoords2[2] = 1.0f;    mesh.texcoords2[3] = 0.0f;

								    mesh.texcoords2[4] = 0.0f;    mesh.texcoords2[5] = 1.0f;

								    mesh.texcoords2[6] = 1.0f;    mesh.texcoords2[7] = 1.0f;


								    // Load a new texcoords2 attributes buffer

								    mesh.vboId[SHADER_LOC_VERTEX_TEXCOORD02] = rlLoadVertexBuffer(mesh.texcoords2, mesh.vertexCount*2*sizeof(float), false);

								    rlEnableVertexArray(mesh.vaoId);


								    // Index 5 is for texcoords2

								    rlSetVertexAttribute(5, 2, RL_FLOAT, 0, 0, 0);

								    rlEnableVertexAttribute(5);

								    rlDisableVertexArray();


								    // Load lightmap shader

								    Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/lightmap.vs", GLSL_VERSION),

								                               TextFormat("resources/shaders/glsl%i/lightmap.fs", GLSL_VERSION));


								    Texture texture = LoadTexture("resources/cubicmap_atlas.png");

								    Texture light = LoadTexture("resources/spark_flame.png");


								    GenTextureMipmaps(&texture);

								    SetTextureFilter(texture, TEXTURE_FILTER_TRILINEAR);


								    RenderTexture lightmap = LoadRenderTexture(MAP_SIZE, MAP_SIZE);


								    SetTextureFilter(lightmap.texture, TEXTURE_FILTER_TRILINEAR);


								    Material material = LoadMaterialDefault();

								    material.shader = shader;

								    material.maps[MATERIAL_MAP_ALBEDO].texture = texture;

								    material.maps[MATERIAL_MAP_METALNESS].texture = lightmap.texture;


								    // Drawing to lightmap

								    BeginTextureMode(lightmap);

								        ClearBackground(BLACK);


								        BeginBlendMode(BLEND_ADDITIVE);

								            DrawTexturePro(

								                light,

								                (Rectangle){ 0, 0, light.width, light.height },

								                (Rectangle){ 0, 0, 20, 20 },

								                (Vector2){ 10.0, 10.0 },

								                0.0,

								                RED

								            );

								            DrawTexturePro(

								                light,

								                (Rectangle){ 0, 0, light.width, light.height },

								                (Rectangle){ 8, 4, 20, 20 },

								                (Vector2){ 10.0, 10.0 },

								                0.0,

								                BLUE

								            );

								            DrawTexturePro(

								                light,

								                (Rectangle){ 0, 0, light.width, light.height },

								                (Rectangle){ 8, 8, 10, 10 },

								                (Vector2){ 5.0, 5.0 },

								                0.0,

								                GREEN

								            );

								        BeginBlendMode(BLEND_ALPHA);

								    EndTextureMode();


								    SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second

								    //--------------------------------------------------------------------------------------


								    // Main game loop

								    while (!WindowShouldClose())        // Detect window close button or ESC key

								    {

								        // Update

								        //----------------------------------------------------------------------------------

								        UpdateCamera(&camera, CAMERA_ORBITAL);

								        //----------------------------------------------------------------------------------


								        // Draw

								        //----------------------------------------------------------------------------------

								        BeginDrawing();

								            ClearBackground(RAYWHITE);


								            BeginMode3D(camera);

								                DrawMesh(mesh, material, MatrixIdentity());

								            EndMode3D();


								            DrawFPS(10, 10);


								            DrawTexturePro(

								                lightmap.texture,

								                (Rectangle){ 0, 0, -MAP_SIZE, -MAP_SIZE },

								                (Rectangle){ GetRenderWidth() - MAP_SIZE*8 - 10, 10, MAP_SIZE*8, MAP_SIZE*8 },

								                (Vector2){ 0.0, 0.0 },

								                0.0,

								                WHITE);


								            DrawText("lightmap", GetRenderWidth() - 66, 16 + MAP_SIZE*8, 10, GRAY);

								            DrawText("10x10 pixels", GetRenderWidth() - 76, 30 + MAP_SIZE*8, 10, GRAY);


								        EndDrawing();

								        //----------------------------------------------------------------------------------

								    }


								    // De-Initialization

								    //--------------------------------------------------------------------------------------

								    UnloadMesh(mesh);       // Unload the mesh

								    UnloadShader(shader);   // Unload shader


								    CloseWindow();          // Close window and OpenGL context

								    //--------------------------------------------------------------------------------------


								    return 0;

								}