77 lines
2.6 KiB
GLSL
77 lines
2.6 KiB
GLSL
//
|
|
// Copyright (c) Microsoft. All rights reserved.
|
|
// This code is licensed under the MIT License (MIT).
|
|
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
|
|
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
|
|
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
|
|
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
|
|
//
|
|
// Developed by Minigraph
|
|
//
|
|
// Author: James Stanard
|
|
//
|
|
|
|
#[compute]
|
|
|
|
#version 450
|
|
|
|
VERSION_DEFINES
|
|
|
|
layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
|
|
|
|
layout(push_constant, binding = 1, std430) uniform Params {
|
|
float z_far;
|
|
float z_near;
|
|
bool orthogonal;
|
|
uint pad;
|
|
}
|
|
params;
|
|
|
|
layout(set = 0, binding = 0) uniform sampler2D source_depth;
|
|
|
|
layout(r16f, set = 1, binding = 0) uniform restrict writeonly image2D linear_z;
|
|
layout(r32f, set = 2, binding = 0) uniform restrict writeonly image2D downsampled2x;
|
|
layout(r16f, set = 3, binding = 0) uniform restrict writeonly image2DArray downsampled2x_atlas;
|
|
layout(r32f, set = 4, binding = 0) uniform restrict writeonly image2D downsampled4x;
|
|
layout(r16f, set = 5, binding = 0) uniform restrict writeonly image2DArray downsampled4x_atlas;
|
|
|
|
float Linearize(uvec2 p_pos) {
|
|
float depth = texelFetch(source_depth, ivec2(p_pos), 0).r * 2.0 - 1.0;
|
|
if (params.orthogonal) {
|
|
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);
|
|
} else {
|
|
depth = 2.0 * params.z_near / (params.z_far + params.z_near - depth * (params.z_far - params.z_near));
|
|
}
|
|
imageStore(linear_z, ivec2(p_pos), vec4(depth));
|
|
return depth;
|
|
}
|
|
|
|
shared float local_cache[256];
|
|
|
|
void main() {
|
|
uvec2 start = gl_WorkGroupID.xy << 4 | gl_LocalInvocationID.xy;
|
|
uint dest_index = gl_LocalInvocationID.y << 4 | gl_LocalInvocationID.x;
|
|
local_cache[dest_index + 0] = Linearize(start | uvec2(0, 0));
|
|
local_cache[dest_index + 8] = Linearize(start | uvec2(8, 0));
|
|
local_cache[dest_index + 128] = Linearize(start | uvec2(0, 8));
|
|
local_cache[dest_index + 136] = Linearize(start | uvec2(8, 8));
|
|
|
|
groupMemoryBarrier();
|
|
barrier();
|
|
|
|
uint index = (gl_LocalInvocationID.x << 1) | (gl_LocalInvocationID.y << 5);
|
|
|
|
float w1 = local_cache[index];
|
|
|
|
uvec2 pos = gl_GlobalInvocationID.xy;
|
|
uint slice = (pos.x & 3) | ((pos.y & 3) << 2);
|
|
imageStore(downsampled2x, ivec2(pos), vec4(w1));
|
|
imageStore(downsampled2x_atlas, ivec3(pos >> 2, slice), vec4(w1));
|
|
|
|
if ((gl_LocalInvocationIndex & 011) == 0) {
|
|
pos = gl_GlobalInvocationID.xy >> 1;
|
|
slice = (pos.x & 3) | ((pos.y & 3) << 2);
|
|
imageStore(downsampled4x, ivec2(pos), vec4(w1));
|
|
imageStore(downsampled4x_atlas, ivec3(pos >> 2, slice), vec4(w1));
|
|
}
|
|
}
|