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turnip: clamp to zero negative upper left corner of viewport

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We cannot send negative viewport coordinates to the hardware,
so clamp them since negative min.x/y is valid per spec.
The negative origin still counts in calculations of guardband.

Fixes crash in 3DMark's "Sling Shot Extreme" test.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9629>
This commit is contained in:
Danylo Piliaiev 2021-03-16 19:48:30 +02:00 committed by Marge Bot
parent efd1d5cc59
commit 243724031b
1 changed files with 6 additions and 2 deletions
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8
src/freedreno/vulkan/tu_pipeline.c
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@ -1731,8 +1731,12 @@ tu6_emit_viewport(struct tu_cs *cs, const VkViewport *viewports, uint32_t num_vi
/* allow viewport->width = 0.0f for un-initialized viewports: */
if (min.x == max.x)
max.x++;
assert(min.x >= 0 && min.x < max.x);
assert(min.y >= 0 && min.y < max.y);
min.x = MAX2(min.x, 0);
min.y = MAX2(min.y, 0);
assert(min.x < max.x);
assert(min.y < max.y);
tu_cs_emit(cs, A6XX_GRAS_SC_VIEWPORT_SCISSOR_TL_X(min.x) |
A6XX_GRAS_SC_VIEWPORT_SCISSOR_TL_Y(min.y));
tu_cs_emit(cs, A6XX_GRAS_SC_VIEWPORT_SCISSOR_TL_X(max.x - 1) |