40 lines
797 B
GLSL
40 lines
797 B
GLSL
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uniform sampler2D texture;
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uniform lowp vec4 tone;
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uniform lowp float opacity;
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uniform lowp vec4 color;
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uniform float bushDepth;
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uniform lowp float bushOpacity;
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varying vec2 v_texCoord;
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const vec3 lumaF = vec3(.299, .587, .114);
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void main()
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{
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/* Sample source color */
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vec4 frag = texture2D(texture, v_texCoord);
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/* Apply gray */
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float luma = dot(frag.rgb, lumaF);
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frag.rgb = mix(frag.rgb, vec3(luma), tone.w);
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/* Apply tone */
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frag.rgb += tone.rgb;
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/* Apply opacity */
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frag.a *= opacity;
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/* Apply color */
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frag.rgb = mix(frag.rgb, color.rgb, color.a);
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/* Apply bush alpha by mathematical if */
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lowp float underBush = float(v_texCoord.y < bushDepth);
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frag.a *= clamp(bushOpacity + underBush, 0.0, 1.0);
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gl_FragColor = frag;
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}
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