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

[Bas Nieuwenhuizen]

On Tue, Mar 20, 2018 at 3:11 PM, Samuel Pitoiset
<samuel.pitoiset at gmail.com> wrote:
> 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);

Is this correct when depth_range_unrestricted is *not* enabled? I
thought without a clamp we were supposed to clamp everything
implicitly to [0,1].
> +       }
> +
>         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
>
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