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Allow compiler to unroll pow2ize

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Kp 2013-08-16 02:00:35 +00:00
parent 20cf3f4cdb
commit d909692148
2 changed files with 10 additions and 5 deletions
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2
common/include/ogl_init.h
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@ -108,7 +108,7 @@ bool g3_draw_tmap_2(int nv,g3s_point **pointlist,g3s_uvl *uvl_list,g3s_lrgb *lig
void ogl_draw_vertex_reticle(int cross,int primary,int secondary,int color,int alpha,int size_offs);
void ogl_toggle_depth_test(int enable);
void ogl_set_blending();
int pow2ize(int x);//from ogl.c
unsigned pow2ize(unsigned x);//from ogl.c
#ifdef __cplusplus
}

13
similar/arch/ogl/ogl.c
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@ -1254,10 +1254,15 @@ void gr_flip(void)
}
//little hack to find the nearest bigger power of 2 for a given number
int pow2ize(int x){
int i;
for (i=2; i<x; i*=2) {}; //corrected by MD2211: was previously limited to 4096
return i;
unsigned pow2ize(unsigned f0){
unsigned f1 = (f0 - 1) | 1;
for (unsigned i = 4; i -- > 0;)
f1 |= f1 >> (1 << i);
unsigned f2 = f1 + 1;
assert(f2 >= f0);
assert(!(f2 & f1));
assert((f2 >> 1) < f0);
return f2;
}
// Allocate the pixel buffers 'pixels' and 'texbuf' based on current screen resolution