77 lines
2.0 KiB
GLSL
77 lines
2.0 KiB
GLSL
highp vec3 blend_normal(highp vec4 base, highp vec4 stroke, highp float alpha_tot)
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{
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return mix(
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base.rgb,
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stroke.rgb,
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stroke.a/alpha_tot
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);
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}
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highp vec3 blend_multiply(highp vec4 base, highp vec4 stroke, highp float alpha_tot)
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{
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return mix(
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stroke.rgb,
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mix(
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base.rgb,
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base.rgb*stroke.rgb,
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stroke.a/alpha_tot
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),
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base.a/alpha_tot
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);
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}
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highp vec3 blend_screen(highp vec4 base, highp vec4 stroke, highp float alpha_tot)
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{
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return mix(
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stroke.rgb,
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mix(
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base.rgb,
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1.0-(1.0-base.rgb)*(1.0-stroke.rgb),
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stroke.a/alpha_tot
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),
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base.a/alpha_tot
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);
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}
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highp vec3 blend_colorDodge(highp vec4 base, highp vec4 stroke, highp float alpha_tot)
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{
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return mix(
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stroke.rgb,
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mix(
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base.rgb,
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base.rgb/(1.0-stroke.rgb),
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stroke.a/alpha_tot
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),
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base.a/alpha_tot
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);
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}
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highp vec3 blend_overlay(highp vec4 base, highp vec4 stroke, highp float alpha_tot)
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{
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return mix(
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stroke.rgb,
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mix(
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base.rgb,
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mix(
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2.0*base.rgb*stroke.rgb,
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1.0-2.0*(1.0-base.rgb)*(1.0-stroke.rgb),
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floor(base.rgb*2.0)
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),
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stroke.a/alpha_tot
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),
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base.a/alpha_tot
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);
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}
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highp vec4 blend(highp vec4 base, highp vec4 stroke, int mode)
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{
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mediump float contribution = (1.0 - base.a) * stroke.a;
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mediump float alpha_tot = base.a + contribution;
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if (mode == 0) return vec4(blend_normal(base, stroke, alpha_tot), alpha_tot);
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else if (mode == 1) return vec4(blend_multiply(base, stroke, alpha_tot), alpha_tot);
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else if (mode == 2) return vec4(blend_screen(base, stroke, alpha_tot), alpha_tot);
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else if (mode == 3) return vec4(blend_colorDodge(base, stroke, alpha_tot), alpha_tot);
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else if (mode == 4) return vec4(blend_overlay(base, stroke, alpha_tot), alpha_tot);
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else return vec4(1.0, 0.0, 0.0, 1.0);
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}
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