lavapipe: implement VK_EXT_provoking_vertex

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10458>

4 files changed, 23 insertions, 2 deletions

diff --git a/src/gallium/frontends/lavapipe/lvp_device.c b/src/gallium/frontends/lavapipe/lvp_device.c
index e6759f609073..45ad59e4d905 100644
--- a/src/gallium/frontends/lavapipe/lvp_device.c
+++ b/src/gallium/frontends/lavapipe/lvp_device.c
@@ -137,6 +137,7 @@ static const struct vk_device_extension_table lvp_device_extensions_supported =
    .EXT_transform_feedback                = true,
    .EXT_vertex_attribute_divisor          = true,
    .EXT_custom_border_color               = true,
+   .EXT_provoking_vertex                  = true,
    .GOOGLE_decorate_string                = true,
    .GOOGLE_hlsl_functionality1            = true,
 };
@@ -636,7 +637,13 @@ VKAPI_ATTR void VKAPI_CALL lvp_GetPhysicalDeviceFeatures2(
          features->customBorderColorWithoutFormat = true;
          break;
       }
-
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROVOKING_VERTEX_FEATURES_EXT: {
+         VkPhysicalDeviceProvokingVertexFeaturesEXT *features =
+            (VkPhysicalDeviceProvokingVertexFeaturesEXT*)ext;
+         features->provokingVertexLast = true;
+         features->transformFeedbackPreservesProvokingVertex = true;
+         break;
+      }
       default:
          break;
       }
@@ -954,6 +961,13 @@ VKAPI_ATTR void VKAPI_CALL lvp_GetPhysicalDeviceProperties2(
          properties->maxCustomBorderColorSamplers = 32 * 1024;
          break;
       }
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROVOKING_VERTEX_PROPERTIES_EXT: {
+         VkPhysicalDeviceProvokingVertexPropertiesEXT *properties =
+            (VkPhysicalDeviceProvokingVertexPropertiesEXT*)ext;
+         properties->provokingVertexModePerPipeline = true;
+         properties->transformFeedbackPreservesTriangleFanProvokingVertex = true;
+         break;
+      }
       default:
          break;
       }
diff --git a/src/gallium/frontends/lavapipe/lvp_execute.c b/src/gallium/frontends/lavapipe/lvp_execute.c
index fcb1375e4141..b335f66efcb3 100644
--- a/src/gallium/frontends/lavapipe/lvp_execute.c
+++ b/src/gallium/frontends/lavapipe/lvp_execute.c
@@ -463,7 +463,7 @@ static void handle_graphics_pipeline(struct lvp_cmd_buffer_entry *cmd,
       state->rs_state.fill_front = vk_polygon_mode_to_pipe(rsc->polygonMode);
       state->rs_state.fill_back = vk_polygon_mode_to_pipe(rsc->polygonMode);
       state->rs_state.point_size_per_vertex = true;
-      state->rs_state.flatshade_first = true;
+      state->rs_state.flatshade_first = !pipeline->provoking_vertex_last;
       state->rs_state.point_quad_rasterization = true;
       state->rs_state.clip_halfz = true;
       state->rs_state.half_pixel_center = true;
diff --git a/src/gallium/frontends/lavapipe/lvp_pipeline.c b/src/gallium/frontends/lavapipe/lvp_pipeline.c
index 0bc7b6f1c821..40fd86712054 100644
--- a/src/gallium/frontends/lavapipe/lvp_pipeline.c
+++ b/src/gallium/frontends/lavapipe/lvp_pipeline.c
@@ -755,6 +755,12 @@ lvp_graphics_pipeline_init(struct lvp_pipeline *pipeline,
    deep_copy_graphics_create_info(pipeline->mem_ctx, &pipeline->graphics_create_info, pCreateInfo);
    pipeline->is_compute_pipeline = false;
 
+   const VkPipelineRasterizationProvokingVertexStateCreateInfoEXT *pv_state =
+      vk_find_struct_const(pCreateInfo->pRasterizationState,
+                           PIPELINE_RASTERIZATION_PROVOKING_VERTEX_STATE_CREATE_INFO_EXT);
+   pipeline->provoking_vertex_last = pv_state && pv_state->provokingVertexMode == VK_PROVOKING_VERTEX_MODE_LAST_VERTEX_EXT;
+
+
    for (uint32_t i = 0; i < pCreateInfo->stageCount; i++) {
       VK_FROM_HANDLE(vk_shader_module, module,
                       pCreateInfo->pStages[i].module);
diff --git a/src/gallium/frontends/lavapipe/lvp_private.h b/src/gallium/frontends/lavapipe/lvp_private.h
index 86b2bf0264f0..debca5e889cc 100644
--- a/src/gallium/frontends/lavapipe/lvp_private.h
+++ b/src/gallium/frontends/lavapipe/lvp_private.h
@@ -475,6 +475,7 @@ struct lvp_pipeline {
    void *shader_cso[PIPE_SHADER_TYPES];
    VkGraphicsPipelineCreateInfo graphics_create_info;
    VkComputePipelineCreateInfo compute_create_info;
+   bool provoking_vertex_last;
 };
 
 struct lvp_event {