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raylib-src
镜像自地址 https://github.com/raysan5/raylib


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

								*

								*   raylib [rlgl] example - compute shader - Conway's Game of Life

								*

								*   NOTE: This example requires raylib OpenGL 4.3 versions for compute shaders support,

								*         shaders used in this example are #version 430 (OpenGL 4.3)

								*

								*   Example originally created with raylib 4.0, last time updated with raylib 2.5

								*

								*   Example contributed by Teddy Astie (@tsnake41) 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) 2021-2023 Teddy Astie (@tsnake41)

								*

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


								#include "raylib.h"

								#include "rlgl.h"


								#include <stdlib.h>


								// IMPORTANT: This must match gol*.glsl GOL_WIDTH constant.

								// This must be a multiple of 16 (check golLogic compute dispatch).

								#define GOL_WIDTH 768


								// Maximum amount of queued draw commands (squares draw from mouse down events).

								#define MAX_BUFFERED_TRANSFERTS 48


								// Game Of Life Update Command

								typedef struct GolUpdateCmd {

								    unsigned int x;         // x coordinate of the gol command

								    unsigned int y;         // y coordinate of the gol command

								    unsigned int w;         // width of the filled zone

								    unsigned int enabled;   // whether to enable or disable zone

								} GolUpdateCmd;


								// Game Of Life Update Commands SSBO

								typedef struct GolUpdateSSBO {

								    unsigned int count;

								    GolUpdateCmd commands[MAX_BUFFERED_TRANSFERTS];

								} GolUpdateSSBO;


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

								// Program main entry point

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

								int main(void)

								{

								    // Initialization

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

								    InitWindow(GOL_WIDTH, GOL_WIDTH, "raylib [rlgl] example - compute shader - game of life");


								    const Vector2 resolution = { GOL_WIDTH, GOL_WIDTH };

								    unsigned int brushSize = 8;


								    // Game of Life logic compute shader

								    char *golLogicCode = LoadFileText("resources/shaders/glsl430/gol.glsl");

								    unsigned int golLogicShader = rlCompileShader(golLogicCode, RL_COMPUTE_SHADER);

								    unsigned int golLogicProgram = rlLoadComputeShaderProgram(golLogicShader);

								    UnloadFileText(golLogicCode);


								    // Game of Life logic render shader

								    Shader golRenderShader = LoadShader(NULL, "resources/shaders/glsl430/gol_render.glsl");

								    int resUniformLoc = GetShaderLocation(golRenderShader, "resolution");


								    // Game of Life transfert shader (CPU<->GPU download and upload)

								    char *golTransfertCode = LoadFileText("resources/shaders/glsl430/gol_transfert.glsl");

								    unsigned int golTransfertShader = rlCompileShader(golTransfertCode, RL_COMPUTE_SHADER);

								    unsigned int golTransfertProgram = rlLoadComputeShaderProgram(golTransfertShader);

								    UnloadFileText(golTransfertCode);


								    // Load shader storage buffer object (SSBO), id returned

								    unsigned int ssboA = rlLoadShaderBuffer(GOL_WIDTH*GOL_WIDTH*sizeof(unsigned int), NULL, RL_DYNAMIC_COPY);

								    unsigned int ssboB = rlLoadShaderBuffer(GOL_WIDTH*GOL_WIDTH*sizeof(unsigned int), NULL, RL_DYNAMIC_COPY);

								    unsigned int ssboTransfert = rlLoadShaderBuffer(sizeof(GolUpdateSSBO), NULL, RL_DYNAMIC_COPY);


								    GolUpdateSSBO transfertBuffer = { 0 };


								    // Create a white texture of the size of the window to update

								    // each pixel of the window using the fragment shader: golRenderShader

								    Image whiteImage = GenImageColor(GOL_WIDTH, GOL_WIDTH, WHITE);

								    Texture whiteTex = LoadTextureFromImage(whiteImage);

								    UnloadImage(whiteImage);

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


								    // Main game loop

								    while (!WindowShouldClose())

								    {

								        // Update

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

								        brushSize += (int)GetMouseWheelMove();


								        if ((IsMouseButtonDown(MOUSE_BUTTON_LEFT) || IsMouseButtonDown(MOUSE_BUTTON_RIGHT))

								            && (transfertBuffer.count < MAX_BUFFERED_TRANSFERTS))

								        {

								            // Buffer a new command

								            transfertBuffer.commands[transfertBuffer.count].x = GetMouseX() - brushSize/2;

								            transfertBuffer.commands[transfertBuffer.count].y = GetMouseY() - brushSize/2;

								            transfertBuffer.commands[transfertBuffer.count].w = brushSize;

								            transfertBuffer.commands[transfertBuffer.count].enabled = IsMouseButtonDown(MOUSE_BUTTON_LEFT);

								            transfertBuffer.count++;

								        }

								        else if (transfertBuffer.count > 0)  // Process transfert buffer

								        {

								            // Send SSBO buffer to GPU

								            rlUpdateShaderBuffer(ssboTransfert, &transfertBuffer, sizeof(GolUpdateSSBO), 0);


								            // Process SSBO commands on GPU

								            rlEnableShader(golTransfertProgram);

								            rlBindShaderBuffer(ssboA, 1);

								            rlBindShaderBuffer(ssboTransfert, 3);

								            rlComputeShaderDispatch(transfertBuffer.count, 1, 1); // Each GPU unit will process a command!

								            rlDisableShader();


								            transfertBuffer.count = 0;

								        }

								        else

								        {

								            // Process game of life logic

								            rlEnableShader(golLogicProgram);

								            rlBindShaderBuffer(ssboA, 1);

								            rlBindShaderBuffer(ssboB, 2);

								            rlComputeShaderDispatch(GOL_WIDTH/16, GOL_WIDTH/16, 1);

								            rlDisableShader();


								            // ssboA <-> ssboB

								            int temp = ssboA;

								            ssboA = ssboB;

								            ssboB = temp;

								        }


								        rlBindShaderBuffer(ssboA, 1);

								        SetShaderValue(golRenderShader, resUniformLoc, &resolution, SHADER_UNIFORM_VEC2);

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


								        // Draw

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

								        BeginDrawing();


								            ClearBackground(BLANK);


								            BeginShaderMode(golRenderShader);

								                DrawTexture(whiteTex, 0, 0, WHITE);

								            EndShaderMode();


								            DrawRectangleLines(GetMouseX() - brushSize/2, GetMouseY() - brushSize/2, brushSize, brushSize, RED);


								            DrawText("Use Mouse wheel to increase/decrease brush size", 10, 10, 20, WHITE);

								            DrawFPS(GetScreenWidth() - 100, 10);


								        EndDrawing();

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

								    }


								    // De-Initialization

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

								    // Unload shader buffers objects.

								    rlUnloadShaderBuffer(ssboA);

								    rlUnloadShaderBuffer(ssboB);

								    rlUnloadShaderBuffer(ssboTransfert);


								    // Unload compute shader programs

								    rlUnloadShaderProgram(golTransfertProgram);

								    rlUnloadShaderProgram(golLogicProgram);


								    UnloadTexture(whiteTex);            // Unload white texture

								    UnloadShader(golRenderShader);      // Unload rendering fragment shader


								    CloseWindow();                      // Close window and OpenGL context

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


								    return 0;

								}