Simon Schneegans
22 lines
853 B
GLSL
22 lines
853 B
GLSL
// This method returns a mask which smoothly transitions towards zero when approaching
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// the window's borders. There is a variant which takes the transition area width in
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// pixels and one which takes this as a percentage.
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float getEdgeMask(vec2 uv, vec2 maxUV, float fadeWidth) {
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float mask = 1.0;
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mask *= smoothstep(0, 1, clamp(uv.x / fadeWidth, 0, 1));
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mask *= smoothstep(0, 1, clamp(uv.y / fadeWidth, 0, 1));
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mask *= smoothstep(0, 1, clamp((maxUV.x - uv.x) / fadeWidth, 0, 1));
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mask *= smoothstep(0, 1, clamp((maxUV.y - uv.y) / fadeWidth, 0, 1));
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return mask;
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}
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float getAbsoluteEdgeMask(float fadePixels) {
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vec2 uv = cogl_tex_coord_in[0].st * uSize;
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return getEdgeMask(uv, uSize, fadePixels);
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}
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float getRelativeEdgeMask(float fadeAmount) {
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vec2 uv = cogl_tex_coord_in[0].st;
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return getEdgeMask(uv, vec2(1.0), fadeAmount);
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} |