114 lines
2.8 KiB
GLSL
114 lines
2.8 KiB
GLSL
#version 430
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layout(local_size_x = 1, local_size_y = 1) in; // size of local work group - 1 pixel
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// gbuffer?
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layout(rgba32f, binding = 2) readonly uniform image2D _g0;
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layout(rgba32f, binding = 3) readonly uniform image2D _g1;
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// final output
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layout(rgba32f, binding = 0) uniform image2D img_output; // rgba32f defines internal format, image2d for random write to output texture
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uniform vec3 _skyColor = vec3(0.68,0.85,0.9);
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// TODO: some of these depend on each other!! need be be in this order for now c:
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#include func.glsl
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#include constants.glsl
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#include time.glsl
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#include sphere.glsl
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#include ray.glsl
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#include intersect.glsl
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#include random.glsl
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#include camera.glsl
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#include image.glsl
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// scene.glsl includes scene trace function
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#include scene.glsl
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#include lighting.glsl
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#include depth.glsl
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vec3 shade(inout Ray ray, RayHit hit)
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{
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if (hit.distance < INF)
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{
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switch (hit.material)
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{
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case MAT_SKY: break;
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case MAT_LAMBERT:
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scatterLambert(ray, hit);
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break;
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case MAT_CHROME:
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return scatterMetal(ray, hit);
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break;
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}
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}
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// sky color
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return _skyColor;
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}
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void main()
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{
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// base pixel colour for the image
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vec4 pixel = vec4(0.0, 0.0, 0.0, 1.0);
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ivec2 pixelCoords = ivec2(gl_GlobalInvocationID.xy);
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ivec2 dims = imageSize(img_output);
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vec2 uv = pixelUv(pixelCoords, dims);
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vec4 g[2];
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// load data from first pass
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g[0] = imageLoad(_g0, ivec2(gl_GlobalInvocationID.xy));
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float depth = g[0].w;
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vec3 normal = g[0].xyz*2.0-1.0; // unpack normal packaged into texture
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g[1] = imageLoad(_g1, ivec2(gl_GlobalInvocationID.xy));
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vec3 albedo = g[1].xyz;
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// create a ray from the uv
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Ray ray = createCameraRay(uv);
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RayHit firstHit;
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firstHit.position = ray.origin+ray.direction*depth;
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firstHit.distance = depth;
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firstHit.normal = normal;
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firstHit.albedo = albedo;
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int sky = depth >= INF ? 1 : 0;
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int bounces = (1-sky) * BOUNCES;
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pixel.xyz = mix(pixel.xyz, _skyColor, sky);
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// sample
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int samples = 2;
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for (int i = 0; i < samples; i++)
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{
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float sampleDepth = 0;
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// trace the ray's path around the scene
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for (int j = 0; j < bounces; j++)
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{
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RayHit hit = trace(ray);
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depth = getLogarithmicDepth(ray.distance);
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pixel.xyz += ray.energy * shade(ray, hit);
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if (length(ray.energy) < 0.001) break;
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}
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depth += sampleDepth / float(samples);
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}
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// include the first sample we took
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samples++;
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// gamma correction
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float scale = 1.0 / samples;
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pixel.xyz = sqrt(scale * pixel.xyz);
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pixel.xyz = mix(pixel.xyz, vec3(1.0), depth);
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// output to a specific pixel in the image
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imageStore(img_output, ivec2(gl_GlobalInvocationID.xy), pixel);
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}
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