41 lines
992 B
GLSL
41 lines
992 B
GLSL
uniform vec2 resolution; // Screen resolution
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uniform float xoff;
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uniform float yoff;
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uniform float scale;
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uniform bool tile;
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uniform bool hide_edges;
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uniform bool stretch;
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vec4 process(vec4 col) {
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vec2 texCoord = v_texcoord;
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vec2 offset = vec2(1.0);
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if (!stretch) {
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if (resolution.x > resolution.y) {
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offset.x = (resolution.x/resolution.y);
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texCoord.x *= offset.x;
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} else {
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offset.y = (resolution.y/resolution.x);
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texCoord.y *= offset.y;
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}
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}
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vec2 p = 2.0 * texCoord - offset;
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vec2 adj_tc = 2.0 * v_texcoord - 1.0;
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float r = dot(p,p);
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if (r > 1.0) discard;
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float f = (1.0-sqrt(1.0-r))/(r);
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vec2 uv;
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uv.x = (adj_tc.x*(1.5-scale*0.01))*f+0.5-(xoff*0.01);
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uv.y = (adj_tc.y*(1.5-scale*0.01))*f+0.5-(yoff*0.01);
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if (tile) {
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uv.x = mod(uv.x, 1.0);
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uv.y = mod(uv.y, 1.0);
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} else if (hide_edges && (uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0)) {
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return vec4(0.0);
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}
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return vec4(texture2D(texture,uv));
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}
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