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with Y=0=top, front/back determination is negated

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This commit is contained in:
Brian 2007-08-13 15:02:50 -06:00
parent faa14a9ded
commit c271078048
3 changed files with 5 additions and 5 deletions
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4
src/mesa/pipe/draw/draw_cull.c
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@ -78,10 +78,10 @@ static void cull_tri( struct draw_stage *stage,
header->det = ex * fy - ey * fx;
if (header->det != 0) {
/* if (det > 0 then Z points toward camera and triangle is
/* if (det < 0 then Z points toward camera and triangle is
* counter-clockwise winding.
*/
GLuint winding = (header->det > 0) ? PIPE_WINDING_CCW : PIPE_WINDING_CW;
GLuint winding = (header->det < 0) ? PIPE_WINDING_CCW : PIPE_WINDING_CW;
if ((winding & cull_stage(stage)->winding) == 0) {
/* triangle is not culled, pass to next stage */

4
src/mesa/pipe/draw/draw_twoside.c
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@ -53,9 +53,9 @@ static void twoside_begin( struct draw_stage *stage )
/*
* We'll multiply the primitive's determinant by this sign to determine
* if the triangle is back-facing (negative).
* sign = 1 for CCW, -1 for CW
* sign = -1 for CCW, +1 for CW
*/
twoside->sign = (stage->draw->setup.front_winding == PIPE_WINDING_CCW) ? 1 : -1;
twoside->sign = (stage->draw->setup.front_winding == PIPE_WINDING_CCW) ? -1 : 1;
stage->next->begin( stage->next );
}

2
src/mesa/pipe/draw/draw_unfilled.c
View file

@ -119,7 +119,7 @@ static void unfilled_tri( struct draw_stage *stage,
struct prim_header *header )
{
struct unfilled_stage *unfilled = unfilled_stage(stage);
GLuint mode = unfilled->mode[header->det > 0.0];
GLuint mode = unfilled->mode[header->det < 0.0];
switch (mode) {
case PIPE_POLYGON_MODE_FILL: