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render/vulkan: add support for RGB565 texture format

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Since this does not have a matching _SRGB-type vulkan format, add a
new shader variant/pipeline to perform the sRGB->linear texture
conversion.
This commit is contained in:
Manuel Stoeckl 2022-11-11 22:53:06 -05:00 • committed by Simon Ser
parent 060df4c6c0
commit 3ed69b4946
4 changed files with 78 additions and 8 deletions
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22
render/vulkan/shaders/texture.frag
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@ -9,8 +9,28 @@ layout(push_constant) uniform UBO {
layout(offset = 80) float alpha;
} data;
layout (constant_id = 0) const int TEXTURE_TRANSFORM = 0;
#define TEXTURE_TRANSFORM_IDENTITY 0
#define TEXTURE_TRANSFORM_SRGB 1
float srgb_to_linear(float x) {
return max(x / 12.92, pow((x + 0.055) / 1.055, 2.4));
}
void main() {
out_color = textureLod(tex, uv, 0);
vec4 val = textureLod(tex, uv, 0);
if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_SRGB) {
out_color = vec4(
srgb_to_linear(val.r),
srgb_to_linear(val.g),
srgb_to_linear(val.b),
val.a
);
} else { // TEXTURE_TRANSFORM_IDENTITY
out_color = val;
}
out_color *= data.alpha;
}