38 lines
951 B
GLSL
38 lines
951 B
GLSL
#version 150
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precision highp float;
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// these are our textures
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uniform sampler2DRect msdf_0;
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uniform sampler2DRect msdf_1;
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uniform vec4 fontColor;
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uniform float msdf_mix;
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uniform float msdf_pxratio;
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// this comes from the vertex shader
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in vec2 texCoordVarying;
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// this is the output of the fragment shader
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out vec4 outputColor;
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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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float screenPxRange(float ratio) {
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return ratio * 2.0;
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}
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void main()
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{
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vec4 bgColor = vec4(fontColor.rgb,0);
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vec4 fgColor = fontColor;
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vec3 msd_0 = texture(msdf_0, texCoordVarying).rgb;
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vec3 msd_1 = texture(msdf_1, texCoordVarying).rgb;
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vec3 msd = mix(msd_0, msd_1,msdf_mix);
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float sd = median(msd.r, msd.g, msd.b);
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float screenPxDistance = screenPxRange(msdf_pxratio)*(sd - 0.5);
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float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
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outputColor = mix(bgColor, fgColor, opacity);
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}
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