[Mesa-dev] [PATCH] radv: optimize path when depth clamp is disabled

[Samuel Pitoiset]

Ported from AMVDVLK.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/amd/vulkan/radv_pipeline.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/amd/vulkan/radv_pipeline.c b/src/amd/vulkan/radv_pipeline.c
index 89c5e69941..638c3074ec 100644
--- a/src/amd/vulkan/radv_pipeline.c
+++ b/src/amd/vulkan/radv_pipeline.c
@@ -2198,9 +2198,11 @@ radv_pipeline_generate_depth_stencil_state(struct radeon_winsys_cs *cs,
 	const VkPipelineDepthStencilStateCreateInfo *vkds = pCreateInfo->pDepthStencilState;
 	RADV_FROM_HANDLE(radv_render_pass, pass, pCreateInfo->renderPass);
 	struct radv_subpass *subpass = pass->subpasses + pCreateInfo->subpass;
+	struct radv_shader_variant *ps = pipeline->shaders[MESA_SHADER_FRAGMENT];
 	struct radv_render_pass_attachment *attachment = NULL;
 	uint32_t db_depth_control = 0, db_stencil_control = 0;
 	uint32_t db_render_control = 0, db_render_override2 = 0;
+	uint32_t db_render_override = 0;
 
 	if (subpass->depth_stencil_attachment.attachment != VK_ATTACHMENT_UNUSED)
 		attachment = pass->attachments + subpass->depth_stencil_attachment.attachment;
@@ -2242,10 +2244,22 @@ radv_pipeline_generate_depth_stencil_state(struct radeon_winsys_cs *cs,
 		db_render_override2 |= S_028010_DISABLE_SMEM_EXPCLEAR_OPTIMIZATION(extra->db_stencil_disable_expclear);
 	}
 
+	db_render_override |= S_02800C_FORCE_HIS_ENABLE0(V_02800C_FORCE_DISABLE) |
+			      S_02800C_FORCE_HIS_ENABLE1(V_02800C_FORCE_DISABLE);
+
+	if (!pCreateInfo->pRasterizationState->depthClampEnable &&
+	    ps->info.info.ps.writes_z) {
+		/* Optimized path when depth clamp is disabled, ported from
+		 * AMDVLK.
+		 */
+		db_render_override |= S_02800C_DISABLE_VIEWPORT_CLAMP(1);
+	}
+
 	radeon_set_context_reg(cs, R_028800_DB_DEPTH_CONTROL, db_depth_control);
 	radeon_set_context_reg(cs, R_02842C_DB_STENCIL_CONTROL, db_stencil_control);
 
 	radeon_set_context_reg(cs, R_028000_DB_RENDER_CONTROL, db_render_control);
+	radeon_set_context_reg(cs, R_02800C_DB_RENDER_OVERRIDE, db_render_override);
 	radeon_set_context_reg(cs, R_028010_DB_RENDER_OVERRIDE2, db_render_override2);
 }
 
-- 
2.16.2