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70 lines
1.9 KiB
GLSL
70 lines
1.9 KiB
GLSL
#[compute]
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#version 450
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VERSION_DEFINES
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layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
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layout(set = 0, binding = 0) uniform samplerCube source_cube;
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layout(push_constant, binding = 1, std430) uniform Params {
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ivec2 screen_size;
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ivec2 offset;
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float bias;
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float z_far;
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float z_near;
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bool z_flip;
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}
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params;
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layout(r32f, set = 1, binding = 0) uniform restrict writeonly image2D depth_buffer;
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void main() {
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ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
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if (any(greaterThan(pos, params.screen_size))) { //too large, do nothing
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return;
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}
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vec2 pixel_size = 1.0 / vec2(params.screen_size);
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vec2 uv = (vec2(pos) + 0.5) * pixel_size;
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vec3 normal = vec3(uv * 2.0 - 1.0, 0.0);
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normal.z = 0.5 - 0.5 * ((normal.x * normal.x) + (normal.y * normal.y));
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normal = normalize(normal);
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normal.y = -normal.y; //needs to be flipped to match projection matrix
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if (!params.z_flip) {
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normal.z = -normal.z;
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}
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float depth = texture(source_cube, normal).r;
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// absolute values for direction cosines, bigger value equals closer to basis axis
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vec3 unorm = abs(normal);
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if ((unorm.x >= unorm.y) && (unorm.x >= unorm.z)) {
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// x code
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unorm = normal.x > 0.0 ? vec3(1.0, 0.0, 0.0) : vec3(-1.0, 0.0, 0.0);
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} else if ((unorm.y > unorm.x) && (unorm.y >= unorm.z)) {
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// y code
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unorm = normal.y > 0.0 ? vec3(0.0, 1.0, 0.0) : vec3(0.0, -1.0, 0.0);
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} else if ((unorm.z > unorm.x) && (unorm.z > unorm.y)) {
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// z code
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unorm = normal.z > 0.0 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 0.0, -1.0);
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} else {
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// oh-no we messed up code
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// has to be
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unorm = vec3(1.0, 0.0, 0.0);
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}
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float depth_fix = 1.0 / dot(normal, unorm);
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depth = 2.0 * depth - 1.0;
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float linear_depth = 2.0 * params.z_near * params.z_far / (params.z_far + params.z_near - depth * (params.z_far - params.z_near));
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depth = (linear_depth * depth_fix) / params.z_far;
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imageStore(depth_buffer, pos + params.offset, vec4(depth));
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}
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