diff options
Diffstat (limited to 'src/mesa/swrast')
| -rw-r--r-- | src/mesa/swrast/s_texture.c | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c index 060c8e136d8..f5f4bb5d632 100644 --- a/src/mesa/swrast/s_texture.c +++ b/src/mesa/swrast/s_texture.c @@ -1,4 +1,4 @@ -/* $Id: s_texture.c,v 1.59 2002/04/12 15:39:59 brianp Exp $ */ +/* $Id: s_texture.c,v 1.60 2002/04/12 21:17:28 brianp Exp $ */ /* * Mesa 3-D graphics library @@ -2813,15 +2813,37 @@ texture_combine(const GLcontext *ctx, } } break; + case GL_DOT3_RGB_EXT: + case GL_DOT3_RGBA_EXT: + { + /* Do not scale the result by 1 2 or 4 */ + const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; + const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; + for (i = 0; i < n; i++) { +#if CHAN_TYPE == GL_FLOAT + GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) + + (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) + + (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F)) + * 4.0F; +#else + GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half, + (GLint)arg1[i][RCOMP] - half) + + S_PROD((GLint)arg0[i][GCOMP] - half, + (GLint)arg1[i][GCOMP] - half) + + S_PROD((GLint)arg0[i][BCOMP] - half, + (GLint)arg1[i][BCOMP] - half)) >> 6; +#endif + dot = CLAMP(dot, 0, CHAN_MAX); + rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot; + } + } + break; case GL_DOT3_RGB_ARB: case GL_DOT3_RGBA_ARB: { + /* DO scale the result by 1 2 or 4 */ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; - /* ATI's EXT extension has a constant scale by 4. The ARB - * one will likely remove this restriction, and we should - * drop the EXT extension in favour of the ARB one. - */ for (i = 0; i < n; i++) { #if CHAN_TYPE == GL_FLOAT GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) + @@ -2836,7 +2858,7 @@ texture_combine(const GLcontext *ctx, S_PROD((GLint)arg0[i][BCOMP] - half, (GLint)arg1[i][BCOMP] - half)) >> 6; #endif - dot = CLAMP(dot, 0, CHAN_MAX); + dot = CLAMP(dot, 0, CHAN_MAX) << RGBshift; rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot; } } @@ -2953,7 +2975,10 @@ texture_combine(const GLcontext *ctx, _mesa_problem(ctx, "invalid combine mode"); } - /* Fix the alpha component for GL_DOT3_RGBA_EXT combining. + /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining. + * This is kind of a kludge. It would have been better if the spec + * were written such that the GL_COMBINE_ALPHA value could be set to + * GL_DOT3. */ if (textureUnit->CombineModeRGB == GL_DOT3_RGBA_EXT || textureUnit->CombineModeRGB == GL_DOT3_RGBA_ARB) { |