1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// This file is included by SWTri.cpp and should not be built directly by the project.
unsigned int tex;
#if !defined(LINEAR_BLEND)
{
unsigned int t_pos = ((v)>>16)*tex_pitch + ((u)>>16);
tex = t_pos<tex_endpos?pTexture[t_pos]:0;
}
#else
{
int umid = u-0x8000;
int vmid = v-0x8000;
int umidfloor = FixedFloor(umid);
int vmidfloor = FixedFloor(vmid);
unsigned int t_pos = (vmidfloor>>16)*tex_pitch + (umidfloor>>16);
unsigned int t00 = t_pos<tex_endpos?pTexture[t_pos]:0;
unsigned int t10 = t_pos+1<tex_endpos?pTexture[t_pos+1]:0;
unsigned int t01 = t_pos+tex_pitch<tex_endpos?pTexture[t_pos+tex_pitch]:0;
unsigned int t11 = t_pos+tex_pitch+1<tex_endpos?pTexture[t_pos+tex_pitch+1]:0;
int aUFactor = ((umid-umidfloor) & 0xFFFE) + 1; // aUFactor needs to be between 1 and 0xFFFF to avoid overflow
int aVFactor = ((vmid-vmidfloor) & 0xFFFE) + 1; // ditto for aVFactor
int a00 = ((t00 >> 24) * ((uint32_t) ((0x10000 - aUFactor) * (0x10000 - aVFactor)) >> 16)) >> 16;
int a10 = ((t10 >> 24) * ((uint32_t) (( aUFactor) * (0x10000 - aVFactor)) >> 16)) >> 16;
int a01 = ((t01 >> 24) * ((uint32_t) ((0x10000 - aUFactor) * ( aVFactor)) >> 16)) >> 16;
int a11 = ((t11 >> 24) * ((uint32_t) (( aUFactor) * ( aVFactor)) >> 16)) >> 16;
unsigned int r = (((t00&0x00FF0000)*a00 + (t10&0x00FF0000)*a10 + (t01&0x00FF0000)*a01 + (t11&0x00FF0000)*a11)>>8)&0xFF0000;
unsigned int g = (((t00&0x0000FF00)*a00 + (t10&0x0000FF00)*a10 + (t01&0x0000FF00)*a01 + (t11&0x0000FF00)*a11)>>8)&0x00FF00;
unsigned int b = (((t00&0x000000FF)*a00 + (t10&0x000000FF)*a10 + (t01&0x000000FF)*a01 + (t11&0x000000FF)*a11)>>8)&0x0000FF;
unsigned int a = ((a00 + a10 + a01 + a11)<<24)&0xFF000000;
tex = a|r|g|b;
}
#endif
unsigned int alpha;
#if defined (TEX_ALPHA)
alpha = tex>>24;
#else
alpha = 0xFF;
#endif
|
