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flat in vec4 color_flat;
noperspective in vec2 texCoord_interp;
out vec4 fragColor;
uniform sampler2D glyph;
const vec2 offsets4[4] = vec2[4](
vec2(-0.5, 0.5), vec2(0.5, 0.5), vec2(-0.5, -0.5), vec2(-0.5, -0.5));
const vec2 offsets16[16] = vec2[16](vec2(-1.5, 1.5),
vec2(-0.5, 1.5),
vec2(0.5, 1.5),
vec2(1.5, 1.5),
vec2(-1.5, 0.5),
vec2(-0.5, 0.5),
vec2(0.5, 0.5),
vec2(1.5, 0.5),
vec2(-1.5, -0.5),
vec2(-0.5, -0.5),
vec2(0.5, -0.5),
vec2(1.5, -0.5),
vec2(-1.5, -1.5),
vec2(-0.5, -1.5),
vec2(0.5, -1.5),
vec2(1.5, -1.5));
#define sample_glyph_offset(texco, texel, ofs) texture(glyph, texco + ofs * texel).r
void main()
{
// input color replaces texture color
fragColor.rgb = color_flat.rgb;
vec2 texel = 1.0 / vec2(textureSize(glyph, 0));
vec2 texco = abs(texCoord_interp);
// modulate input alpha & texture alpha
if (texCoord_interp.x > 0) {
fragColor.a = texture(glyph, texco).r;
}
else {
fragColor.a = 0.0;
if (texCoord_interp.y > 0) {
/* 3x3 blur */
/* Manual unroll for perf. (stupid glsl compiler) */
fragColor.a += sample_glyph_offset(texco, texel, offsets4[0]);
fragColor.a += sample_glyph_offset(texco, texel, offsets4[1]);
fragColor.a += sample_glyph_offset(texco, texel, offsets4[2]);
fragColor.a += sample_glyph_offset(texco, texel, offsets4[3]);
fragColor.a *= (1.0 / 4.0);
}
else {
/* 5x5 blur */
/* Manual unroll for perf. (stupid glsl compiler) */
fragColor.a += sample_glyph_offset(texco, texel, offsets16[0]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[1]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[2]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[3]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[4]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[5]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[6]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[7]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[8]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[9]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[10]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[11]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[12]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[13]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[14]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[15]);
fragColor.a *= (1.0 / 20.0);
}
}
fragColor.a *= color_flat.a;
}
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