host/vulkan/emulated_textures/shaders/AstcToRgb.comp

#version 450
#include "AstcDecompressor.glsl"
#include "Common.comp"

precision highp int;

layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;

layout(push_constant) uniform ImageFormatBlock {
    uvec2 blockSize;
    uint baseLayer;
    uint smallBlock;  // TODO(gregschlom) Remove this once we remove the old decoder.
}
u_pushConstant;

layout(binding = 0, rgba32ui) readonly uniform WITH_TYPE(uimage) srcImage;
layout(binding = 1, rgba8ui) writeonly uniform WITH_TYPE(uimage) dstImage;

void main() {
    uvec2 texelPos = gl_GlobalInvocationID.xy;
    uint layer = u_pushConstant.baseLayer + gl_GlobalInvocationID.z;
    uvec2 blockPos = texelPos / u_pushConstant.blockSize;
    uvec2 posInBlock = texelPos % u_pushConstant.blockSize;

    uvec4 astcBlock = imageLoad(srcImage, WITH_TYPE(getPos)(ivec3(blockPos, layer))).wzyx;
    astcDecoderInitialize(astcBlock, u_pushConstant.blockSize);
    uvec4 texel = astcDecodeTexel(posInBlock);
    imageStore(dstImage, WITH_TYPE(getPos)(ivec3(texelPos, layer)), texel);
}