Nerfed/Nerfed.Runtime/Graphics/StockShaders/Source/text_msdf.frag

35 lines
833 B
GLSL

#version 450
layout(location = 0) in vec2 inTexCoord;
layout(location = 1) in vec4 inColor;
layout(location = 0) out vec4 outColor;
layout(set = 2, binding = 0) uniform sampler2D msdf;
layout(set = 3, binding = 0) uniform UBO
{
float pxRange;
} ubo;
float median(float r, float g, float b)
{
return max(min(r, g), min(max(r, g), b));
}
float screenPxRange()
{
vec2 unitRange = vec2(ubo.pxRange)/vec2(textureSize(msdf, 0));
vec2 screenTexSize = vec2(1.0)/fwidth(inTexCoord);
return max(0.5*dot(unitRange, screenTexSize), 1.0);
}
void main()
{
vec3 msd = texture(msdf, inTexCoord).rgb;
float sd = median(msd.r, msd.g, msd.b);
float screenPxDistance = screenPxRange() * (sd - 0.5);
float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
outColor = mix(vec4(0.0, 0.0, 0.0, 0.0), inColor, opacity);
}