playcanvas/build/playcanvas/src/scene/shader-lib/glsl/chunks/common/frag/msdf.js

Open-source WebGL/WebGPU 3D engine for the web

var msdf_default = `
uniform sampler2D texture_msdfMap;
float median(float r, float g, float b) {
	return max(min(r, g), min(max(r, g), b));
}
uniform float font_sdfIntensity;
uniform float font_pxrange;
#ifndef LIT_MSDF_TEXT_ATTRIBUTE
	uniform vec4 outline_color;
	uniform float outline_thickness;
	uniform vec4 shadow_color;
	uniform vec2 shadow_offset;
#else
	varying vec4 outline_color;
	varying float outline_thickness;
	varying vec4 shadow_color;
	varying vec2 shadow_offset;
#endif
vec4 applyMsdf(vec4 color) {
	color.rgb = gammaCorrectInput(color.rgb);
	vec3 tsample = texture2D(texture_msdfMap, vUv0).rgb;
	vec2 uvShdw = vUv0 - shadow_offset;
	vec3 ssample = texture2D(texture_msdfMap, uvShdw).rgb;
	float sigDist = median(tsample.r, tsample.g, tsample.b);
	float sigDistShdw = median(ssample.r, ssample.g, ssample.b);
	float edge = 0.5 - 0.5 * font_sdfIntensity;
	vec2 unitRange = vec2(font_pxrange) / vec2(textureSize(texture_msdfMap, 0));
	float screenPxRange = max(0.5 * dot(unitRange, 1.0 / max(fwidth(vUv0), vec2(1e-6))), 2.5);
	float inside = clamp(screenPxRange * (sigDist - edge) + 0.5, 0.0, 1.0);
	float outline = clamp(screenPxRange * (sigDist + outline_thickness - edge) + 0.5, 0.0, 1.0);
	float shadow = clamp(screenPxRange * (sigDistShdw + outline_thickness - edge) + 0.5, 0.0, 1.0);
	vec4 tcolor = (outline > inside) ? outline * vec4(outline_color.a * outline_color.rgb, outline_color.a) : vec4(0.0);
	tcolor = mix(tcolor, color, inside);
	vec4 scolor = (shadow > outline) ? shadow * vec4(shadow_color.a * shadow_color.rgb, shadow_color.a) : tcolor;
	tcolor = mix(scolor, tcolor, outline);
	tcolor.rgb = gammaCorrectOutput(tcolor.rgb);
	
	return tcolor;
}
`;
export {
	msdf_default as default
};