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draw: tweak aa line width threshold and sampling

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Set sampler max_lod to avoid sampling the 1x1 and 2x2 mipmap levels.

Fixes piglit line-aa-width test, fd.o bug 29160.
This commit is contained in:
Brian Paul
2010-07-21 11:37:13 -06:00
parent c052213fb3
commit aa9003e20e
1 changed files with 6 additions and 4 deletions
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src/gallium/auxiliary/draw/draw_pipe_aaline.c
+6 -4
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@@ -425,7 +425,8 @@ aaline_create_texture(struct aaline_stage *aaline)
/* Fill in mipmap images.
* Basically each level is solid opaque, except for the outermost
* texels which are zero. Special case the 1x1 and 2x2 levels.
* texels which are zero. Special case the 1x1 and 2x2 levels
* (though, those levels shouldn't be used - see the max_lod setting).
*/
for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
struct pipe_transfer *transfer;
@@ -497,7 +498,8 @@ aaline_create_sampler(struct aaline_stage *aaline)
sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
sampler.normalized_coords = 1;
sampler.min_lod = 0.0f;
sampler.max_lod = MAX_TEXTURE_LEVEL;
/* avoid using the 1x1 and 2x2 mipmap levels */
sampler.max_lod = MAX_TEXTURE_LEVEL - 2;
aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
if (aaline->sampler_cso == NULL)
@@ -669,8 +671,8 @@ aaline_first_line(struct draw_stage *stage, struct prim_header *header)
assert(draw->rasterizer->line_smooth);
if (draw->rasterizer->line_width <= 3.0)
aaline->half_line_width = 1.5f;
if (draw->rasterizer->line_width <= 2.2)
aaline->half_line_width = 1.1f;
else
aaline->half_line_width = 0.5f * draw->rasterizer->line_width;