diff options
Diffstat (limited to 'osframework/source/SexyAppFramework/SWTri_GetTexel.cpp')
| -rw-r--r-- | osframework/source/SexyAppFramework/SWTri_GetTexel.cpp | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/osframework/source/SexyAppFramework/SWTri_GetTexel.cpp b/osframework/source/SexyAppFramework/SWTri_GetTexel.cpp new file mode 100644 index 0000000..4ffdd38 --- /dev/null +++ b/osframework/source/SexyAppFramework/SWTri_GetTexel.cpp @@ -0,0 +1,44 @@ +// 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) * ((ulong) ((0x10000 - aUFactor) * (0x10000 - aVFactor)) >> 16)) >> 16;
+ int a10 = ((t10 >> 24) * ((ulong) (( aUFactor) * (0x10000 - aVFactor)) >> 16)) >> 16;
+ int a01 = ((t01 >> 24) * ((ulong) ((0x10000 - aUFactor) * ( aVFactor)) >> 16)) >> 16;
+ int a11 = ((t11 >> 24) * ((ulong) (( 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
+
|