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syoyo/gist:44620be1c77195bc736e

Created October 9, 2015 15:03
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Bilinear interpolation of alpha value
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gistfile1.txt
// Simple Bilinear interpolation(e.g. texture filtering)
// w0 + w1 + w2 + w3 = 1.0f;
// a[0] ~ a[3] = alpha value of 2x2 pixels.
float ret = w0 * a[0] + w1 * a[1] + w2 * a[2] + w3 * a[3];
// Sometimes ret become 0x3ffffff if all a's are 1.0f(0x3f800000) due to numerical error?
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