40 lines
750 B
Plaintext
40 lines
750 B
Plaintext
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// VERTEX_SHADER:
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// mask.glsl
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void main() {
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gl_Position = u_projection * u_modelview * vec4(aPosition, 0.0, 1.0);
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vUv = vec2(aUv.x, aUv.y);
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}
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// FRAGMENT_SHADER:
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// mask.glsl
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uniform int u_mode;
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uniform sampler2D u_mask;
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float
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luminance (vec3 color)
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{
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return dot (vec3 (0.2126, 0.7152, 0.0722), color);
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}
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void main() {
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vec4 source = GskTexture(u_source, vUv);
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vec4 mask = GskTexture(u_mask, vUv);
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float mask_value;
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if (u_mode == 0)
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mask_value = mask.a;
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else if (u_mode == 1)
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mask_value = 1.0 - mask.a;
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else if (u_mode == 2)
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mask_value = luminance (mask.rgb);
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else if (u_mode == 3)
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mask_value = mask.a - luminance (mask.rgb);
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else
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mask_value = 0.0;
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gskSetOutputColor(vec4 (source * mask_value));
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}
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