34 lines
754 B
GLSL
34 lines
754 B
GLSL
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uniform sampler2D sceneTex;
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uniform float textureWidth;
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uniform float textureHeight;
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uniform float cursorX;
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uniform float cursorY;
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uniform float zoom;
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uniform float radius;
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#define PI 3.14159
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// Converts pixel coordinates to texture coordinates
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vec2 pix2tex(vec2 pix)
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{
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return vec2(pix.x / textureWidth, 1.0 - pix.y / textureHeight);
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}
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void main()
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{
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vec2 texcoord = gl_TexCoord[0].xy;
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float dx = cursorX - texcoord.x;
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float dy = cursorY - texcoord.y;
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float dist = sqrt(dx*dx + dy*dy);
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if(dist < radius)
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{
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float disp = sin(dist / radius * PI) * (zoom - 1.0) * 20.0;
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texcoord.x += dx / dist * disp;
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texcoord.y += dy / dist * disp;
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}
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gl_FragColor = texture2D(sceneTex, pix2tex(texcoord));
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}
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