106 lines
3.1 KiB
Lua
106 lines
3.1 KiB
Lua
local ffi = require "ffi"
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local width, height = 1024, 1024
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rl.InitWindow(width, height, "raylib-lua [core] example - compute shader")
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local computeShaderCode
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do
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local f = io.open("resources/gol.glsl", "rb")
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assert(f, "Can't read resources/gol.glsl file")
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computeShaderCode = f:read "*a"
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f:close()
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end
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local computeShader = rl.rlCompileShader(computeShaderCode, rl.RL_COMPUTE_SHADER)
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local csProgram = rl.rlLoadComputeShaderProgram(computeShader)
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print(csProgram)
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local ssbo_size = ffi.sizeof("int32_t[?]", width * height)
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local ssbo_baseBuffer = ffi.new("int32_t[?]", width * height)
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for i=0,width * height - 1 do
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ssbo_baseBuffer[i] = 0
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end
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local shader_framebuffer = rl.new("Color[?]", width * height)
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local ssbo_image = rl.new "Image" ---@type Image
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ssbo_image.data = shader_framebuffer
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ssbo_image.width = width
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ssbo_image.height = height
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ssbo_image.format = rl.PIXELFORMAT_UNCOMPRESSED_R8G8B8A8
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ssbo_image.mipmaps = 1
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local ssboA = rl.rlLoadShaderBuffer(ssbo_size, ssbo_baseBuffer, rl.RL_STREAM_COPY)
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local ssboB = rl.rlLoadShaderBuffer(ssbo_size, ssbo_baseBuffer, rl.RL_STREAM_COPY)
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-- Create a texture to apply shader
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local renderTexture = rl.LoadRenderTexture(width, height)
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local renderShader = rl.LoadShaderFromMemory(nil, [[
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#version 430
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out vec4 finalColor;
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in vec2 fragTexCoord;
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layout(std430, binding = 1) readonly buffer golLayout {
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int golBuffer[];
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};
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uniform vec2 res;
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void main()
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{
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ivec2 coords = ivec2(fragTexCoord * res);
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if (golBuffer[coords.x + coords.y * uint(res.x)] == 1)
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finalColor = vec4(1.0);
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else
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finalColor = vec4(0.0, 0.0, 0.0, 1.0);
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}
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]])
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local resolution = ffi.new("float[2]", width, height)
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local res_uniform = rl.GetShaderLocation(renderShader, "res")
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while not rl.WindowShouldClose() do
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rl.BeginDrawing()
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if rl.IsMouseButtonDown(rl.MOUSE_BUTTON_LEFT) then
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rl.rlReadShaderBufferElements(ssboB, ssbo_baseBuffer, ssbo_size, 0)
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-- Correct colors
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for i=0,(width * height)-1 do
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local toggled = ssbo_baseBuffer[i]
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shader_framebuffer[i].r = toggled * 255
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shader_framebuffer[i].g = toggled * 255
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shader_framebuffer[i].b = toggled * 255
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shader_framebuffer[i].a = toggled * 255
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end
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rl.ImageDrawRectangleV(ssbo_image, rl.GetMousePosition(), rl.new("Vector2", 25, 25), rl.WHITE)
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for x=0,ssbo_image.width-1 do
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for y=0,ssbo_image.height-1 do
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ssbo_baseBuffer[x + y * width] = (shader_framebuffer[x + y * width].r > 0)
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end
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end
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rl.rlUpdateShaderBufferElements(ssboB, ssbo_baseBuffer, ssbo_size, 0)
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else
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rl.rlEnableShader(csProgram)
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rl.rlBindShaderBuffer(ssboA, 1)
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rl.rlBindShaderBuffer(ssboB, 2)
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rl.rlComputeShaderDispatch(width / 16, height / 16, 1)
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rl.rlDisableShader()
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end
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rl.ClearBackground(rl.BLANK)
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rl.SetShaderValue(renderShader, res_uniform, resolution, rl.SHADER_UNIFORM_VEC2)
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rl.BeginShaderMode(renderShader)
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rl.DrawTexture(renderTexture.texture, 0, 0, rl.WHITE)
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rl.EndShaderMode()
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rl.DrawFPS(0, 0)
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rl.EndDrawing()
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ssboA, ssboB = ssboB, ssboA
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end
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rl.CloseWindow()
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