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Add comments explaining a couple "mystery" bits.

This commit is contained in:
Ian Romanick 2006-08-12 00:11:05 +00:00
parent 32a9e9be0c
commit 357addfc45
1 changed files with 13 additions and 1 deletions
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14
src/mesa/drivers/dri/savage/savage_3d_reg.h
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@ -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;