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authorBrian Paul <brian.paul@tungstengraphics.com>2008-02-29 12:22:04 -0700
committerBrian Paul <brian.paul@tungstengraphics.com>2008-02-29 13:04:53 -0700
commit6da943d204eeb488895933c45e174042cb69c92d (patch)
treef2d8bcbb185f7b84e320d4b4af0ee671b016ae05
parentb8ee90e05a98d5a167c1fdb5a8fc3bc0cb4a6a78 (diff)
gallium: point rast coord tweak
-rw-r--r--src/gallium/auxiliary/draw/draw_wide_point.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/src/gallium/auxiliary/draw/draw_wide_point.c b/src/gallium/auxiliary/draw/draw_wide_point.c
index 8f877a102a..65bd50f2b8 100644
--- a/src/gallium/auxiliary/draw/draw_wide_point.c
+++ b/src/gallium/auxiliary/draw/draw_wide_point.c
@@ -109,7 +109,7 @@ static void widepoint_point( struct draw_stage *stage,
const struct widepoint_stage *wide = widepoint_stage(stage);
const boolean sprite = (boolean) stage->draw->rasterizer->point_sprite;
float half_size;
- float left_adj, right_adj;
+ float left_adj, right_adj, bot_adj, top_adj;
struct prim_header tri;
@@ -124,6 +124,8 @@ static void widepoint_point( struct draw_stage *stage,
float *pos2 = v2->data[0];
float *pos3 = v3->data[0];
+ const float xbias = 0.0, ybias = -0.125;
+
/* point size is either per-vertex or fixed size */
if (wide->psize_slot >= 0) {
half_size = 0.5f * header->v[0]->data[wide->psize_slot][0];
@@ -132,20 +134,22 @@ static void widepoint_point( struct draw_stage *stage,
half_size = wide->half_point_size;
}
- left_adj = -half_size; /* + 0.25f;*/
- right_adj = half_size; /* + 0.25f;*/
+ left_adj = -half_size + xbias;
+ right_adj = half_size + xbias;
+ bot_adj = half_size + ybias;
+ top_adj = -half_size + ybias;
pos0[0] += left_adj;
- pos0[1] -= half_size;
+ pos0[1] += top_adj;
pos1[0] += left_adj;
- pos1[1] += half_size;
+ pos1[1] += bot_adj;
pos2[0] += right_adj;
- pos2[1] -= half_size;
+ pos2[1] += top_adj;
pos3[0] += right_adj;
- pos3[1] += half_size;
+ pos3[1] += bot_adj;
if (sprite) {
static const float tex00[4] = { 0, 0, 0, 1 };