78 lines
2.6 KiB
Text
78 lines
2.6 KiB
Text
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//
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// Copyright (c) Microsoft. All rights reserved.
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// This code is licensed under the MIT License (MIT).
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// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
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// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
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// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
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//
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// Developed by Minigraph
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//
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// Author: James Stanard
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//
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#[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(push_constant, binding = 1, std430) uniform Params {
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float z_far;
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float z_near;
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bool orthogonal;
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uint pad;
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}
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params;
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layout(set = 0, binding = 0) uniform sampler2D source_depth;
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layout(r16f, set = 1, binding = 0) uniform restrict writeonly image2D linear_z;
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layout(r32f, set = 2, binding = 0) uniform restrict writeonly image2D downsampled2x;
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layout(r16f, set = 3, binding = 0) uniform restrict writeonly image2DArray downsampled2x_atlas;
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layout(r32f, set = 4, binding = 0) uniform restrict writeonly image2D downsampled4x;
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layout(r16f, set = 5, binding = 0) uniform restrict writeonly image2DArray downsampled4x_atlas;
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float Linearize(uvec2 p_pos) {
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float depth = texelFetch(source_depth, ivec2(p_pos), 0).r * 2.0 - 1.0;
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if (params.orthogonal) {
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depth = ((depth + (params.z_far + params.z_near) / (params.z_far - params.z_near)) * (params.z_far - params.z_near)) / (2.0 * params.z_far);
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} else {
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depth = 2.0 * params.z_near / (params.z_far + params.z_near - depth * (params.z_far - params.z_near));
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}
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imageStore(linear_z, ivec2(p_pos), vec4(depth));
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return depth;
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}
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shared float local_cache[256];
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void main() {
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uvec2 start = gl_WorkGroupID.xy << 4 | gl_LocalInvocationID.xy;
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uint dest_index = gl_LocalInvocationID.y << 4 | gl_LocalInvocationID.x;
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local_cache[dest_index + 0] = Linearize(start | uvec2(0, 0));
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local_cache[dest_index + 8] = Linearize(start | uvec2(8, 0));
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local_cache[dest_index + 128] = Linearize(start | uvec2(0, 8));
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local_cache[dest_index + 136] = Linearize(start | uvec2(8, 8));
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groupMemoryBarrier();
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barrier();
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uint index = (gl_LocalInvocationID.x << 1) | (gl_LocalInvocationID.y << 5);
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float w1 = local_cache[index];
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uvec2 pos = gl_GlobalInvocationID.xy;
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uint slice = (pos.x & 3) | ((pos.y & 3) << 2);
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imageStore(downsampled2x, ivec2(pos), vec4(w1));
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imageStore(downsampled2x_atlas, ivec3(pos >> 2, slice), vec4(w1));
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if ((gl_LocalInvocationIndex & 011) == 0) {
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pos = gl_GlobalInvocationID.xy >> 1;
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slice = (pos.x & 3) | ((pos.y & 3) << 2);
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imageStore(downsampled4x, ivec2(pos), vec4(w1));
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imageStore(downsampled4x_atlas, ivec3(pos >> 2, slice), vec4(w1));
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}
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}
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