fix parts of the sRGB emulation

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11450 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=9c3a68b2217df842dad217a52fd74cee522ddb05

diff --git a/gl_textures.c b/gl_textures.c
index 0c0b81025ffca748fd3c85a1a97da4c0eb2c1cac..aa1d2f12960466b96b4b36d66c28d5fddc9c70f8 100644 (file)
--- a/gl_textures.c
+++ b/gl_textures.c
@@ -2390,28 +2390,64 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                        case TEXTYPE_DXT3:
                        case TEXTYPE_DXT5:
                                {
-                                       for (i = bytesperblock == 16 ? 8 : 0;i < mipsize;i += bytesperblock)
+                                       for (i = bytesperblock == 16 ? 8 : 0;i < mipsize_total;i += bytesperblock)
                                        {
-                                               c = mippixels_start[i] + 256*mippixels_start[i+1];
-                                               r = ((c >> 11) & 0x1F);
-                                               g = ((c >>  5) & 0x3F);
-                                               b = ((c      ) & 0x1F);
+                                               int c0, c1, c0new, c1new;
+                                               c0 = mippixels_start[i] + 256*mippixels_start[i+1];
+                                               r = ((c0 >> 11) & 0x1F);
+                                               g = ((c0 >>  5) & 0x3F);
+                                               b = ((c0      ) & 0x1F);
                                                r = floor(Image_LinearFloatFromsRGB(r * (255.0f / 31.0f)) * 31.0f + 0.5f); // these multiplications here get combined with multiplications in Image_LinearFloatFromsRGB
                                                g = floor(Image_LinearFloatFromsRGB(g * (255.0f / 63.0f)) * 63.0f + 0.5f); // these multiplications here get combined with multiplications in Image_LinearFloatFromsRGB
                                                b = floor(Image_LinearFloatFromsRGB(b * (255.0f / 31.0f)) * 31.0f + 0.5f); // these multiplications here get combined with multiplications in Image_LinearFloatFromsRGB
-                                               c = (r << 11) | (g << 5) | b;
-                                               mippixels_start[i] = c & 255;
-                                               mippixels_start[i+1] = c >> 8;
-                                               c = mippixels_start[i+2] + 256*mippixels_start[i+3];
-                                               r = ((c >> 11) & 0x1F);
-                                               g = ((c >>  5) & 0x3F);
-                                               b = ((c      ) & 0x1F);
+                                               c0new = (r << 11) | (g << 5) | b;
+                                               c1 = mippixels_start[i+2] + 256*mippixels_start[i+3];
+                                               r = ((c1 >> 11) & 0x1F);
+                                               g = ((c1 >>  5) & 0x3F);
+                                               b = ((c1      ) & 0x1F);
                                                r = floor(Image_LinearFloatFromsRGB(r * (255.0f / 31.0f)) * 31.0f + 0.5f); // these multiplications here get combined with multiplications in Image_LinearFloatFromsRGB
                                                g = floor(Image_LinearFloatFromsRGB(g * (255.0f / 63.0f)) * 63.0f + 0.5f); // these multiplications here get combined with multiplications in Image_LinearFloatFromsRGB
                                                b = floor(Image_LinearFloatFromsRGB(b * (255.0f / 31.0f)) * 31.0f + 0.5f); // these multiplications here get combined with multiplications in Image_LinearFloatFromsRGB
-                                               c = (r << 11) | (g << 5) | b;
-                                               mippixels_start[i+2] = c & 255;
-                                               mippixels_start[i+3] = c >> 8;
+                                               c1new = (r << 11) | (g << 5) | b;
+                                               // swap the colors if needed to fix order
+                                               if(c0 > c1) // thirds
+                                               {
+                                                       if(c0new < c1new)
+                                                       {
+                                                               c = c0new;
+                                                               c0new = c1new;
+                                                               c1new = c;
+                                                               if(c0new == c1new)
+                                                               mippixels_start[i+4] ^= 0x55;
+                                                               mippixels_start[i+5] ^= 0x55;
+                                                               mippixels_start[i+6] ^= 0x55;
+                                                               mippixels_start[i+7] ^= 0x55;
+                                                       }
+                                                       else if(c0new == c1new)
+                                                       {
+                                                               mippixels_start[i+4] = 0x00;
+                                                               mippixels_start[i+5] = 0x00;
+                                                               mippixels_start[i+6] = 0x00;
+                                                               mippixels_start[i+7] = 0x00;
+                                                       }
+                                               }
+                                               else // half + transparent
+                                               {
+                                                       if(c0new > c1new)
+                                                       {
+                                                               c = c0new;
+                                                               c0new = c1new;
+                                                               c1new = c;
+                                                               mippixels_start[i+4] ^= (~mippixels_start[i+4] >> 1) & 0x55;
+                                                               mippixels_start[i+5] ^= (~mippixels_start[i+5] >> 1) & 0x55;
+                                                               mippixels_start[i+6] ^= (~mippixels_start[i+6] >> 1) & 0x55;
+                                                               mippixels_start[i+7] ^= (~mippixels_start[i+7] >> 1) & 0x55;
+                                                       }
+                                               }
+                                               mippixels_start[i] = c0new & 255;
+                                               mippixels_start[i+1] = c0new >> 8;
+                                               mippixels_start[i+2] = c1new & 255;
+                                               mippixels_start[i+3] = c1new >> 8;
                                        }
                                }
                                break;