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godot/modules/betsy/alpha_stitch.glsl
noahbackus 9d30169a8d
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initial commit, 4.5 stable
2025-09-16 20:46:46 -04:00

22 lines
771 B
GLSL

// RGB and Alpha components of ETC2 RGBA/DXT5 are computed separately.
// This compute shader merely stitches them together to form the final result
// It's also used by RG11/BC4 driver to stitch two R11/BC4 into one RG11/BC5
#[compute]
#version 450
layout(local_size_x = 8, //
local_size_y = 8, //
local_size_z = 1) in;
layout(binding = 0) uniform usampler2D srcRGB;
layout(binding = 1) uniform usampler2D srcAlpha;
layout(binding = 2, rgba32ui) uniform restrict writeonly uimage2D dstTexture;
void main() {
uvec2 rgbBlock = texelFetch(srcRGB, ivec2(gl_GlobalInvocationID.xy), 0).xy;
uvec2 alphaBlock = texelFetch(srcAlpha, ivec2(gl_GlobalInvocationID.xy), 0).xy;
imageStore(dstTexture, ivec2(gl_GlobalInvocationID.xy), uvec4(rgbBlock.xy, alphaBlock.xy));
}