mkxp/shader/sprite.frag

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