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llvmpipe: native point rasterization with better pixel rasterization

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A few subpixel_snap and fixed width changes.

Conflicts:

	src/gallium/drivers/llvmpipe/lp_setup_point.c
This commit is contained in:
Hui Qi Tay
2010-08-27 10:46:19 +01:00
committed by Keith Whitwell
parent 57d84d9ca4
commit 2cd72dd459
1 changed files with 18 additions and 16 deletions
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src/gallium/drivers/llvmpipe/lp_setup_point.c
+18 -16
View File
@@ -157,14 +157,16 @@ static void lp_setup_point( struct lp_setup_context *setup,
const float size
= sizeAttr > 0 ? v0[sizeAttr][0]
: setup->point_size;
const float half_width = 0.5F * size;
const int x0 = subpixel_snap(v0[0][0] - half_width - setup->pixel_offset);
const int x1 = subpixel_snap(v0[0][0] - half_width - setup->pixel_offset);
const int x2 = subpixel_snap(v0[0][0] + half_width - setup->pixel_offset);
const int y0 = subpixel_snap(v0[0][1] - half_width - setup->pixel_offset);
const int y1 = subpixel_snap(v0[0][1] + half_width - setup->pixel_offset);
const int y2 = subpixel_snap(v0[0][1] + half_width - setup->pixel_offset);
/* Point size as fixed point integer, remove rounding errors
* and gives minimum width for very small points
*/
int fixed_width = MAX2(FIXED_ONE,
(subpixel_snap(size) + FIXED_ONE/2 - 1) & ~(FIXED_ONE-1));
const int x0 = subpixel_snap(v0[0][0] - setup->pixel_offset) - fixed_width/2;
const int y0 = subpixel_snap(v0[0][1] - setup->pixel_offset) - fixed_width/2;
struct lp_scene *scene = lp_setup_get_current_scene(setup);
struct lp_rast_triangle *point;
unsigned bytes;
@@ -182,10 +184,10 @@ static void lp_setup_point( struct lp_setup_context *setup,
*/
int adj = (setup->pixel_offset != 0) ? 1 : 0;
bbox.x0 = (MIN3(x0, x1, x2) + (FIXED_ONE-1)) >> FIXED_ORDER;
bbox.x1 = (MAX3(x0, x1, x2) + (FIXED_ONE-1)) >> FIXED_ORDER;
bbox.y0 = (MIN3(y0, y1, y2) + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
bbox.y1 = (MAX3(y0, y1, y2) + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
bbox.x0 = (x0 + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
bbox.x1 = (x0 + fixed_width + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
bbox.y0 = (y0 + (FIXED_ONE-1)) >> FIXED_ORDER;
bbox.y1 = (y0 + fixed_width + (FIXED_ONE-1)) >> FIXED_ORDER;
/* Inclusive coordinates:
*/
@@ -214,10 +216,10 @@ static void lp_setup_point( struct lp_setup_context *setup,
#endif
info.v0 = v0;
info.dx01 = x1 - x0;
info.dx12 = x2 - x1;
info.dy01 = y1 - y0;
info.dy12 = y2 - y1;
info.dx01 = 0;
info.dx12 = fixed_width;
info.dy01 = fixed_width;
info.dy12 = 0;
/* Setup parameter interpolants:
*/