29 lines
693 B
GLSL
29 lines
693 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform mat3 worldToOutput;
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uniform vec4 outputRect;
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varying vec4 inputRect[1];
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varying mat3 worldToInput[1];
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uniform float radius;
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float det(mat3 m) { return m[0][0] * m[1][1] - m[0][1] * m[1][0]; }
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void main( void )
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{
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float rad = radius * sqrt(abs(det(worldToOutput)));
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worldToInput[0] = worldToOutput; // Let the input and output references
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// be the same
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inputRect[0] = vec4(
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outputRect.x - rad,
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outputRect.y - rad,
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outputRect.z + rad,
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outputRect.w + rad);
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gl_Position = vec4(0.0); // Does not link without
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}
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