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tu: Implement bin skipping for zero-density regions

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Follow the semi-documented behavior of the blob driver and skip
rendering bins whose fragment density is 0 (i.e. fragment area is
infinite). Some Oculus VR apps using an earlier version of the Unity SDK
rely on this instead of VK_QCOM_multiview_per_view_render_areas.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35894>
This commit is contained in:
Connor Abbott 2025-02-13 11:57:35 -05:00 • committed by Marge Bot
parent 54b50094a0
commit b7a492630e
1 changed files with 12 additions and 0 deletions
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12
src/freedreno/vulkan/tu_cmd_buffer.cc
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@ -3745,6 +3745,18 @@ tu_calc_frag_area(struct tu_cmd_buffer *cmd,
float area = raw_areas[i].width * raw_areas[i].height;
float frac_x = modff(raw_areas[i].width, &floor_x);
float frac_y = modff(raw_areas[i].height, &floor_y);
/* The Vulkan spec says that a density of 0 results in an undefined
* fragment area. However the blob driver skips rendering tiles with 0
* density, and apps rely on that behavior. Replicate that here.
*/
if (!isfinite(area)) {
tile->frag_areas[i].width = UINT32_MAX;
tile->frag_areas[i].height = UINT32_MAX;
tile->visible_views &= ~(1u << i);
continue;
}
/* The spec allows rounding up one of the axes as long as the total
* area is less than or equal to the original area. Take advantage of
* this to try rounding up the number with the largest fraction.