9e63fb6b64
The drawing is now completely shader based, which makes away
with all usage of the depracted matrix stack. This also allows
us to do things like simple translations and texture coordinate
translation directly instead of doing everything indirectly
through matrices.
Fixed vertex attributes ('vertexPointer()' etc) are also
replaced with user defined attribute arrays.
39 lines
772 B
GLSL
39 lines
772 B
GLSL
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uniform sampler2D texture;
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uniform vec4 tone;
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uniform float opacity;
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uniform vec4 color;
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uniform float bushDepth;
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uniform float bushOpacity;
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varying vec2 v_texCoord;
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const vec3 lumaF = { .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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const 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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float underBush = float(v_texCoord.y < bushDepth);
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frag.a *= clamp(bushOpacity + underBush, 0, 1);
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gl_FragColor = frag;
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}
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