48 lines
1.2 KiB
GLSL
48 lines
1.2 KiB
GLSL
#version 450
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layout(location = 0) in vec2 texCoord;
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layout(location = 0) out vec4 outColor;
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layout(set = 2, binding = 0) uniform sampler2D texSampler;
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layout(set = 3, binding = 0) uniform TextConfig
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{
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vec4 textColor;
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vec4 borderColor;
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vec4 backgroundColor;
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float threshold;
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float borderSize;
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float smoothing;
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bool applyBorder;
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} textConfig;
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float median(float r, float g, float b) {
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return max(min(r, g), min(max(r, g), b));
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}
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// this parameter should be same as FontAtlasGeneratorConfig::pixelRange
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const float pxRange = 3;
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float screenPxRange() {
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vec2 unitRange = vec2(pxRange)/vec2(textureSize(texSampler, 0));
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vec2 screenTexSize = vec2(1.0)/fwidth(texCoord);
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return max(0.5*dot(unitRange, screenTexSize), 1.0);
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}
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void main()
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{
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vec3 msd = texture(texSampler, texCoord).rgb;
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float sd = median(msd.r, msd.g, msd.b);
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float screenPxDistance = screenPxRange()*(sd - 0.5);
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float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
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if (textConfig.backgroundColor.a != 0)
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{
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outColor = mix(textConfig.backgroundColor, textConfig.textColor, opacity);
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}
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else
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{
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outColor = vec4(vec3(textConfig.textColor), opacity);
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}
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}
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