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llvmpipe: Don't mess with the provoking vertex when inverting a triangle.

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Fixes a bunch of piglit tests related to flat interpolation of floats.

Signed-off-by: Olivier Galibert <galibert@pobox.com>
Signed-off-by: José Fonseca <jose.r.fonseca@gmail.com>
This commit is contained in:
Olivier Galibert 2012-05-17 09:32:31 +02:00 • committed by José Fonseca
parent c6c8a05c50
commit 1ec421823b
1 changed files with 40 additions and 5 deletions
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45
src/gallium/drivers/llvmpipe/lp_setup_tri.c
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@ -813,12 +813,37 @@ calc_fixed_position( struct lp_setup_context *setup,
}
/**
* Rotate a triangle, flipping its clockwise direction,
* Swaps values for xy[0] and xy[1]
*/
static INLINE void
rotate_fixed_position_01( struct fixed_position* position )
{
int x, y;
x = position->x[1];
y = position->y[1];
position->x[1] = position->x[0];
position->y[1] = position->y[0];
position->x[0] = x;
position->y[0] = y;
position->dx01 = -position->dx01;
position->dy01 = -position->dy01;
position->dx20 = position->x[2] - position->x[0];
position->dy20 = position->y[2] - position->y[0];
position->area = -position->area;
}
/**
* Rotate a triangle, flipping its clockwise direction,
* Swaps values for xy[1] and xy[2]
*/
static INLINE void
rotate_fixed_position( struct fixed_position* position )
rotate_fixed_position_12( struct fixed_position* position )
{
int x, y;
@ -852,8 +877,13 @@ static void triangle_cw( struct lp_setup_context *setup,
calc_fixed_position(setup, &position, v0, v1, v2);
if (position.area < 0) {
rotate_fixed_position(&position);
retry_triangle_ccw(setup, &position, v0, v2, v1, !setup->ccw_is_frontface);
if (setup->flatshade_first) {
rotate_fixed_position_12(&position);
retry_triangle_ccw(setup, &position, v0, v2, v1, !setup->ccw_is_frontface);
} else {
rotate_fixed_position_01(&position);
retry_triangle_ccw(setup, &position, v1, v0, v2, !setup->ccw_is_frontface);
}
}
}
@ -893,8 +923,13 @@ static void triangle_both( struct lp_setup_context *setup,
if (position.area > 0)
retry_triangle_ccw( setup, &position, v0, v1, v2, setup->ccw_is_frontface );
else if (position.area < 0) {
rotate_fixed_position( &position );
retry_triangle_ccw( setup, &position, v0, v2, v1, !setup->ccw_is_frontface );
if (setup->flatshade_first) {
rotate_fixed_position_12( &position );
retry_triangle_ccw( setup, &position, v0, v2, v1, !setup->ccw_is_frontface );
} else {
rotate_fixed_position_01( &position );
retry_triangle_ccw( setup, &position, v1, v0, v2, !setup->ccw_is_frontface );
}
}
}