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#version 310 es
// SPDX-License-Identifier: Unlicense OR MIT
precision mediump float;
layout(binding = 0) uniform sampler2D tex;
layout(location = 0) in highp vec2 vUV;
layout(location = 0) out vec4 fragColor;
layout(push_constant) uniform Color {
// If emulateSRGB is set (!= 0), the input texels are sRGB encoded. We save the
// conversion step below, at the cost of texture filtering in sRGB space.
layout(offset=16) float emulateSRGB;
} _color;
vec3 RGBtosRGB(vec3 rgb) {
bvec3 cutoff = greaterThanEqual(rgb, vec3(0.0031308));
vec3 below = vec3(12.92)*rgb;
vec3 above = vec3(1.055)*pow(rgb, vec3(0.41666)) - vec3(0.055);
return mix(below, above, cutoff);
}
void main() {
vec4 texel = texture(tex, vUV);
if (_color.emulateSRGB == 0.0) {
texel.rgb = RGBtosRGB(texel.rgb);
}
fragColor = texel;
}
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