83 lines
2.1 KiB
GLSL
83 lines
2.1 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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// 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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// 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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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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return scatterLambert(ray, hit);
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}
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// sky color
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return vec3(0.68,0.85,0.9);
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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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// load data from first pass
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vec4 d = imageLoad(_g0, ivec2(gl_GlobalInvocationID.xy));
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float depth = d.w;
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vec3 normal = d.xyz*2.0-1.0; // unpack normal packaged into texture
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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 = vec3(1.0,1.0,1.0);
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// do a trace using precomputed depth and surface normal values
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//RayHit hit = trace(ray);
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// trace the rays path around the scene
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for (int j = 1; j < BOUNCES; j++)
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{
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RayHit hit = trace(ray);
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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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//pixel.xyz = mix(pixel.xyz, normal, 1.0-depth);
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pixel.xyz = mix(pixel.xyz, vec3(1.0), depth);
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//pixel.a = 1.0;
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//pixel.xyz = texture(_g0, uv).xyz;
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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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