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softpipe: Respect gl_rasterization_rules in primitive setup.

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This commit is contained in:
Michal Krol
2009-10-30 08:03:10 +00:00
parent 4a253431ab
commit ca9c413647
1 changed files with 26 additions and 14 deletions
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40
src/gallium/drivers/softpipe/sp_setup.c
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@@ -87,6 +87,8 @@ struct setup_context {
float oneoverarea;
int facing;
float pixel_offset;
struct quad_header quad[MAX_QUADS];
struct quad_header *quad_ptrs[MAX_QUADS];
unsigned count;
@@ -379,6 +381,16 @@ static boolean setup_sort_vertices( struct setup_context *setup,
((det > 0.0) ^
(setup->softpipe->rasterizer->front_winding == PIPE_WINDING_CW));
/* Prepare pixel offset for rasterisation:
* - pixel center (0.5, 0.5) for GL, or
* - assume (0.0, 0.0) for other APIs.
*/
if (setup->softpipe->rasterizer->gl_rasterization_rules) {
setup->pixel_offset = 0.5f;
} else {
setup->pixel_offset = 0.0f;
}
return TRUE;
}
@@ -427,7 +439,7 @@ static void tri_linear_coeff( struct setup_context *setup,
/* calculate a0 as the value which would be sampled for the
* fragment at (0,0), taking into account that we want to sample at
* pixel centers, in other words (0.5, 0.5).
* pixel centers, in other words (pixel_offset, pixel_offset).
*
* this is neat but unfortunately not a good way to do things for
* triangles with very large values of dadx or dady as it will
@@ -438,8 +450,8 @@ static void tri_linear_coeff( struct setup_context *setup,
* instead - i'll switch to this later.
*/
coef->a0[i] = (setup->vmin[vertSlot][i] -
(dadx * (setup->vmin[0][0] - 0.5f) +
dady * (setup->vmin[0][1] - 0.5f)));
(dadx * (setup->vmin[0][0] - setup->pixel_offset) +
dady * (setup->vmin[0][1] - setup->pixel_offset)));
/*
debug_printf("attr[%d].%c: %f dx:%f dy:%f\n",
@@ -487,8 +499,8 @@ static void tri_persp_coeff( struct setup_context *setup,
coef->dadx[i] = dadx;
coef->dady[i] = dady;
coef->a0[i] = (mina -
(dadx * (setup->vmin[0][0] - 0.5f) +
dady * (setup->vmin[0][1] - 0.5f)));
(dadx * (setup->vmin[0][0] - setup->pixel_offset) +
dady * (setup->vmin[0][1] - setup->pixel_offset)));
}
@@ -575,12 +587,12 @@ static void setup_tri_coefficients( struct setup_context *setup )
static void setup_tri_edges( struct setup_context *setup )
{
float vmin_x = setup->vmin[0][0] + 0.5f;
float vmid_x = setup->vmid[0][0] + 0.5f;
float vmin_x = setup->vmin[0][0] + setup->pixel_offset;
float vmid_x = setup->vmid[0][0] + setup->pixel_offset;
float vmin_y = setup->vmin[0][1] - 0.5f;
float vmid_y = setup->vmid[0][1] - 0.5f;
float vmax_y = setup->vmax[0][1] - 0.5f;
float vmin_y = setup->vmin[0][1] - setup->pixel_offset;
float vmid_y = setup->vmid[0][1] - setup->pixel_offset;
float vmax_y = setup->vmax[0][1] - setup->pixel_offset;
setup->emaj.sy = ceilf(vmin_y);
setup->emaj.lines = (int) ceilf(vmax_y - setup->emaj.sy);
@@ -780,8 +792,8 @@ line_linear_coeff(const struct setup_context *setup,
coef->dadx[i] = dadx;
coef->dady[i] = dady;
coef->a0[i] = (setup->vmin[vertSlot][i] -
(dadx * (setup->vmin[0][0] - 0.5f) +
dady * (setup->vmin[0][1] - 0.5f)));
(dadx * (setup->vmin[0][0] - setup->pixel_offset) +
dady * (setup->vmin[0][1] - setup->pixel_offset)));
}
@@ -803,8 +815,8 @@ line_persp_coeff(const struct setup_context *setup,
coef->dadx[i] = dadx;
coef->dady[i] = dady;
coef->a0[i] = (setup->vmin[vertSlot][i] -
(dadx * (setup->vmin[0][0] - 0.5f) +
dady * (setup->vmin[0][1] - 0.5f)));
(dadx * (setup->vmin[0][0] - setup->pixel_offset) +
dady * (setup->vmin[0][1] - setup->pixel_offset)));
}