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#ifdef GL_ES | |
#define LOWP lowp | |
precision mediump float; | |
#else | |
#define LOWP | |
#endif | |
const float offset = 1.0 / 128.0; | |
varying vec2 v_texCoords; | |
uniform sampler2D u_texture; |
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int64_t ipow(int64_t base, uint8_t exp) { | |
static const uint8_t highest_bit_set[] = { | |
0, 1, 2, 2, 3, 3, 3, 3, | |
4, 4, 4, 4, 4, 4, 4, 4, | |
5, 5, 5, 5, 5, 5, 5, 5, | |
5, 5, 5, 5, 5, 5, 5, 5, | |
6, 6, 6, 6, 6, 6, 6, 6, | |
6, 6, 6, 6, 6, 6, 6, 6, | |
6, 6, 6, 6, 6, 6, 6, 6, | |
6, 6, 6, 6, 6, 6, 6, 255, // anything past 63 is a guaranteed overflow with base > 1 |