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llvmpipe: implement sprite coord origin modes

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This commit is contained in:
Brian Paul
2010-09-20 13:48:02 -06:00
parent c3982c6bcd
commit 61fcd9aaa2
1 changed files with 12 additions and 6 deletions
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src/gallium/drivers/llvmpipe/lp_setup_point.c
+12 -6
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@@ -71,7 +71,8 @@ perspective_coef(struct lp_setup_context *setup,
const struct point_info *info,
unsigned slot,
unsigned vert_attr,
unsigned i)
unsigned i,
unsigned sprite_coord_origin)
{
if (i == 0) {
float dadx = FIXED_ONE / (float)info->dx12;
@@ -83,14 +84,18 @@ perspective_coef(struct lp_setup_context *setup,
dady * ((float)info->v0[0][1] - setup->pixel_offset)));
}
else if (i == 1) {
float dadx = 0.0f;
float dady = FIXED_ONE / (float)info->dx12;
float dadx = 0.0f;
float dady = FIXED_ONE / (float)info->dx12;
if (sprite_coord_origin == PIPE_SPRITE_COORD_LOWER_LEFT) {
dady = -dady;
}
point->inputs.dadx[slot][i] = dadx;
point->inputs.dady[slot][i] = dady;
point->inputs.a0[slot][i] = (0.5 -
(dadx * ((float)info->v0[0][0] - setup->pixel_offset) +
dady * ((float)info->v0[0][1] - setup->pixel_offset)));
(dadx * ((float)info->v0[0][0] - setup->pixel_offset) +
dady * ((float)info->v0[0][1] - setup->pixel_offset)));
}
else if (i == 2) {
point->inputs.a0[slot][i] = 0.0f;
@@ -187,7 +192,8 @@ setup_point_coefficients( struct lp_setup_context *setup,
if (setup->sprite_coord_enable & (1 << index)) {
for (i = 0; i < NUM_CHANNELS; i++)
if (usage_mask & (1 << i))
perspective_coef(setup, point, info, slot+1, vert_attr, i);
perspective_coef(setup, point, info, slot+1, vert_attr, i,
setup->sprite_coord_origin);
fragcoord_usage_mask |= TGSI_WRITEMASK_W;
break;
}