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tu: Use EARLY_Z_LATE_Z with alpha-to-coverage

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Alpha-to-coverage behaves like a discard, so we can use EARLY_Z_LATE_Z
for it.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34973>
This commit is contained in:
Danylo Piliaiev 2025-05-12 20:23:58 +02:00 • committed by Marge Bot
parent 13e6dfb45f
commit b6cf0b68be
1 changed files with 11 additions and 8 deletions
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19
src/freedreno/vulkan/tu_cmd_buffer.cc
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@ -6239,14 +6239,19 @@ tu6_build_depth_plane_z_mode(struct tu_cmd_buffer *cmd, struct tu_cs *cs)
if (subpass->depth_stencil_attachment.attachment != VK_ATTACHMENT_UNUSED)
depth_format = pass->attachments[subpass->depth_stencil_attachment.attachment].format;
if ((fs->variant->has_kill ||
bool fs_kill_fragments =
fs->variant->has_kill ||
/* EARLY_Z causes D/S to be written before FS but gl_SampleMask can
* kill fragments, we cannot have EARLY_Z + gl_SampleMask + D/S writes.
*/
fs->variant->writes_smask ||
/* Alpha-to-coverage behaves like a discard. */
cmd->vk.dynamic_graphics_state.ms.alpha_to_coverage_enable;
if ((fs_kill_fragments ||
(cmd->state.pipeline_feedback_loops & VK_IMAGE_ASPECT_DEPTH_BIT) ||
(cmd->vk.dynamic_graphics_state.feedback_loops &
VK_IMAGE_ASPECT_DEPTH_BIT) ||
/* EARLY_Z causes D/S to be written before FS but gl_SampleMask can
* kill fragments, we cannot have EARLY_Z + gl_SampleMask + D/S writes.
*/
fs->variant->writes_smask ||
tu_fs_reads_dynamic_ds_input_attachment(cmd, fs)) &&
(depth_write || stencil_write)) {
zmode = A6XX_EARLY_Z_LATE_Z;
@ -6256,9 +6261,7 @@ tu6_build_depth_plane_z_mode(struct tu_cmd_buffer *cmd, struct tu_cs *cs)
bool force_late_z =
(depth_format == VK_FORMAT_S8_UINT) ||
fs->fs.lrz.force_late_z ||
cmd->state.lrz.force_late_z ||
/* alpha-to-coverage can behave like a discard. */
cmd->vk.dynamic_graphics_state.ms.alpha_to_coverage_enable;
cmd->state.lrz.force_late_z;
/* If there is explicit depth direction in FS writing gl_FragDepth
* may be compatible with LRZ test.