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Fix front/back mix-up. added comments.

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This commit is contained in:
Brian 2007-07-10 11:54:03 -06:00
parent 24b68f4184
commit 1fe4cf83cd
1 changed files with 13 additions and 3 deletions
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16
src/mesa/pipe/draw/draw_unfilled.c
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@ -25,6 +25,11 @@
*
**************************************************************************/
/**
* \brief Drawing stage for handling glPolygonMode(line/point).
* Convert triangles to points or lines as needed.
*/
/* Authors: Keith Whitwell <keith@tungstengraphics.com>
*/
@ -36,6 +41,10 @@
struct unfilled_stage {
struct prim_stage stage;
/** [0] = front face, [1] = back face.
* legal values: PIPE_POLYGON_MODE_FILL, PIPE_POLYGON_MODE_LINE,
* and PIPE_POLYGON_MODE_POINT,
*/
GLuint mode[2];
};
@ -50,8 +59,8 @@ static void unfilled_begin( struct prim_stage *stage )
{
struct unfilled_stage *unfilled = unfilled_stage(stage);
unfilled->mode[0] = stage->draw->setup.fill_ccw;
unfilled->mode[1] = stage->draw->setup.fill_cw;
unfilled->mode[0] = stage->draw->setup.fill_ccw; /* front */
unfilled->mode[1] = stage->draw->setup.fill_cw; /* back */
stage->next->begin( stage->next );
}
@ -87,6 +96,7 @@ static void points( struct prim_stage *stage,
if (v2->edgeflag) point( stage, v2 );
}
static void lines( struct prim_stage *stage,
struct prim_header *header )
{
@ -109,7 +119,7 @@ static void unfilled_tri( struct prim_stage *stage,
struct prim_header *header )
{
struct unfilled_stage *unfilled = unfilled_stage(stage);
GLuint mode = unfilled->mode[header->det < 0];
GLuint mode = unfilled->mode[header->det > 0.0];
switch (mode) {
case PIPE_POLYGON_MODE_FILL: