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| author | Ian Romanick <idr@us.ibm.com> | 2006-08-12 00:11:05 +0000 |
|---|---|---|
| committer | Ian Romanick <idr@us.ibm.com> | 2006-08-12 00:11:05 +0000 |
| commit | 357addfc45ebb8359e0678e2f3c449b79a8bc762 (patch) | |
| tree | b313e4635afcce272c8eaf91d389d59ff089577a /src | |
| parent | 32a9e9be0c9626fb15ae7c721a15bcf19330e13a (diff) | |
| download | external_mesa3d-357addfc45ebb8359e0678e2f3c449b79a8bc762.zip external_mesa3d-357addfc45ebb8359e0678e2f3c449b79a8bc762.tar.gz external_mesa3d-357addfc45ebb8359e0678e2f3c449b79a8bc762.tar.bz2 | |
Add comments explaining a couple "mystery" bits.
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/savage/savage_3d_reg.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/savage/savage_3d_reg.h b/src/mesa/drivers/dri/savage/savage_3d_reg.h index b7d1c39..bc81d73 100644 --- a/src/mesa/drivers/dri/savage/savage_3d_reg.h +++ b/src/mesa/drivers/dri/savage/savage_3d_reg.h @@ -290,6 +290,14 @@ typedef union struct { unsigned dstAlphaMode : 3; + + /** + * This bit enables \c GL_FUNC_SUBTRACT. Like most DirectX oriented + * hardware, there's no way to do \c GL_FUNC_REVERSE_SUBTRACT. + * + * \todo + * Add support for \c GL_FUNC_SUBTRACT! + */ unsigned dstMinusSrc : 1; unsigned srcAlphaMode : 3; unsigned binaryFinalAlpha : 1; @@ -327,7 +335,11 @@ typedef union unsigned texBlendCtrl : 3; unsigned flushPdDestWrites : 1; unsigned flushPdZbufWrites : 1; - /* havn't found an equivalent for Savage4. Utah-driver sets it to 0. */ + + /** + * Disable perspective correct interpolation for vertex color, vertex + * fog, and vertex alpha. For OpenGL, this should \b always be zero. + */ unsigned interpMode : 1; }ni; u_int32_t ui; |