Tleety
75 lines
2.2 KiB
GLSL
75 lines
2.2 KiB
GLSL
#version 430
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#define TILE_SIZE 16
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uniform mat4 P;
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uniform vec2 ScreenDimensions;
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struct Plane {
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vec3 Normal;
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float d;
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};
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struct Frustum {
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Plane Planes[4];
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};
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layout (std430, binding = 0) buffer FrustumBuffer
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{
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Frustum Data[];
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} Frustums;
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vec4 ConvertToView(vec4 ScreenCoords)
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{
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vec2 normalizedScreenCoords = ScreenCoords.xy / ScreenDimensions;
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vec4 clipSpace = vec4( vec2(normalizedScreenCoords.x, normalizedScreenCoords.y) * 2.0 - 1.0, ScreenCoords.z, ScreenCoords.w);
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vec4 view = inverse(P) * clipSpace;
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view = view / view.w;
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return view;
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}
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Plane ComputePlane( vec3 p0, vec3 p1, vec3 p2 )
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{
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Plane plane;
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vec3 v0 = p1 - p0;
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vec3 v2 = p2 - p0;
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plane.Normal = normalize( cross( v0, v2 ) );
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plane.d = dot( vec3(plane.Normal), p0 ); // Always 0 probably
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return plane;
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}
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layout (local_size_x = 16, local_size_y = 16, local_size_z = 1) in;
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void main ()
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{
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//Top-Left = 0 | Top-Right = 1
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//Bottom-Left = 2 | Bottom-Right = 3
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vec4 ScreenCoords[4];
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ScreenCoords[0] = vec4(gl_GlobalInvocationID.x * TILE_SIZE, (gl_GlobalInvocationID.y + 1) * TILE_SIZE, -1.0, 1.0);
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ScreenCoords[1] = vec4((gl_GlobalInvocationID.x + 1) * TILE_SIZE, (gl_GlobalInvocationID.y + 1) * TILE_SIZE, -1.0, 1.0);
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ScreenCoords[2] = vec4(gl_GlobalInvocationID.x * TILE_SIZE, (gl_GlobalInvocationID.y) * TILE_SIZE, -1.0, 1.0);
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ScreenCoords[3] = vec4((gl_GlobalInvocationID.x + 1) * TILE_SIZE, (gl_GlobalInvocationID.y) * TILE_SIZE, -1.0, 1.0);
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vec3 ViewVectors[4];
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for(int i = 0; i < 4; i++) {
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ViewVectors[i] = vec3(ConvertToView(ScreenCoords[i]));
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}
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vec3 EyePos = vec3(0.0, 0.0 ,0.0);
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Frustum f;
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f.Planes[0] = ComputePlane(EyePos, ViewVectors[2], ViewVectors[0]); // left plane
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f.Planes[1] = ComputePlane(EyePos, ViewVectors[1], ViewVectors[3]); // right plane
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f.Planes[2] = ComputePlane(EyePos, ViewVectors[0], ViewVectors[1]); // top plane
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f.Planes[3] = ComputePlane(EyePos, ViewVectors[3], ViewVectors[2]); // bottom plane
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if ( gl_GlobalInvocationID.x < ScreenDimensions.x / TILE_SIZE && gl_GlobalInvocationID.y < ScreenDimensions.y / TILE_SIZE ) { // inside the screen
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Frustums.Data[gl_GlobalInvocationID.x + gl_GlobalInvocationID.y*int(ScreenDimensions.x/TILE_SIZE)] = f;
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}
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} |