legatt
f1380dcef5
- Prevent RmlUi shader from second convertion to SRGB format - Doox Empire regions - ESH regions - Kartilia regions - Country colors are changed
37 lines
1.4 KiB
GLSL
37 lines
1.4 KiB
GLSL
#version 450
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#extension GL_ARB_separate_shader_objects : enable
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#extension GL_ARB_shading_language_420pack : enable
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layout(set = 0, binding = 1) uniform sampler2D Texture;
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layout (location = 0) in vec2 vUV;
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layout (location = 1) in vec4 vColor;
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layout (location = 0) out vec4 outColor;
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// RmlUi works in sRGB with premultiplied alpha: vertex colours from the styles and generated textures
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// (font glyphs) are premultiplied sRGB values. The swapchain is sRGB, so the GPU expects linear output
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// and encodes it to sRGB on write; without conversion colours would be encoded twice and look washed out.
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vec3 srgbToLinear(vec3 c) {
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return mix(c / 12.92, pow((c + 0.055) / 1.055, vec3(2.4)), step(vec3(0.04045), c));
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}
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vec3 linearToSrgb(vec3 c) {
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return mix(c * 12.92, 1.055 * pow(c, vec3(1.0 / 2.4)) - 0.055, step(vec3(0.0031308), c));
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}
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void main() {
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// Textures are uploaded as R8G8B8A8_SRGB, so sampling has already decoded them to linear;
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// bring them back to the sRGB values RmlUi generated before combining with the vertex colour.
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vec4 texColor = texture(Texture, vUV);
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texColor.rgb = linearToSrgb(texColor.rgb);
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vec4 color = vColor * texColor; // premultiplied sRGB
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if (color.a <= 0.0) discard;
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// The pipeline blends with SRC_ALPHA / ONE_MINUS_SRC_ALPHA, so output straight (non-premultiplied) linear colour.
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vec3 straight = clamp(color.rgb / color.a, 0.0, 1.0);
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outColor = vec4(srgbToLinear(straight), color.a);
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}
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