GPU: Add HQ normals workaround.

This change makes it possible for platforms to only support high quality
normal rendering. This is part of {T82856} where current AMD drivers
running on the polaris architecture does not support the low quality
setting due to a driver bug.

In a next commit the work around will be enabled.

source/blender/draw/intern/draw_cache_extract_mesh.c

@@ -5578,7 +5578,8 @@ static void extract_task_create(struct TaskGraph *task_graph,
                                 int32_t *task_counter)
 {
   BLI_assert(scene != NULL);
-  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0;
+  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0 ||
+                             GPU_use_hq_normals_workaround();
   if (do_hq_normals && (extract == &extract_lnor)) {
     extract = &extract_lnor_hq;
   }

source/blender/draw/intern/draw_cache_impl_curve.c

@@ -36,6 +36,7 @@
 #include "BKE_font.h"
 
 #include "GPU_batch.h"
+#include "GPU_capabilities.h"
 #include "GPU_material.h"
 #include "GPU_texture.h"
 
@@ -634,11 +635,11 @@ static void curve_create_edit_curves_nor(CurveRenderData *rdata,
                                          GPUVertBuf *vbo_curves_nor,
                                          const Scene *scene)
 {
-  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0;
+  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0 ||
+                             GPU_use_hq_normals_workaround();
 
   static GPUVertFormat format = {0};
   static GPUVertFormat format_hq = {0};
-  /* TODO(jeroen): add support for high quality normals */
   static struct {
     uint pos, nor, tan, rad;
     uint pos_hq, nor_hq, tan_hq, rad_hq;

source/blender/draw/intern/draw_cache_impl_displist.c

@@ -177,7 +177,8 @@ static int displist_indexbufbuilder_tess_set(
 
 void DRW_displist_vertbuf_create_pos_and_nor(ListBase *lb, GPUVertBuf *vbo, const Scene *scene)
 {
-  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0;
+  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0 ||
+                             GPU_use_hq_normals_workaround();
 
   static GPUVertFormat format = {0};
   static GPUVertFormat format_hq = {0};
@@ -485,7 +486,8 @@ void DRW_displist_vertbuf_create_loop_pos_and_nor_and_uv_and_tan(ListBase *lb,
                                                                  GPUVertBuf *vbo_tan,
                                                                  const Scene *scene)
 {
-  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0;
+  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0 ||
+                             GPU_use_hq_normals_workaround();
 
   static GPUVertFormat format_pos_nor = {0};
   static GPUVertFormat format_pos_nor_hq = {0};

source/blender/draw/intern/draw_cache_impl_volume.c

@@ -40,6 +40,7 @@
 #include "BKE_volume_render.h"
 
 #include "GPU_batch.h"
+#include "GPU_capabilities.h"
 #include "GPU_texture.h"
 
 #include "DEG_depsgraph_query.h"
@@ -157,7 +158,8 @@ static void drw_volume_wireframe_cb(
   Scene *scene = data->scene;
   Volume *volume = data->volume;
   VolumeBatchCache *cache = volume->batch_cache;
-  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0;
+  const bool do_hq_normals = (scene->r.perf_flag & SCE_PERF_HQ_NORMALS) != 0 ||
+                             GPU_use_hq_normals_workaround();
 
   /* Create vertex buffer. */
   static GPUVertFormat format = {0};

source/blender/gpu/GPU_capabilities.h

@@ -43,6 +43,7 @@ int GPU_texture_size_with_limit(int res);
 bool GPU_mip_render_workaround(void);
 bool GPU_depth_blitting_workaround(void);
 bool GPU_use_main_context_workaround(void);
+bool GPU_use_hq_normals_workaround(void);
 bool GPU_crappy_amd_driver(void);
 
 bool GPU_shader_image_load_store_support(void);

source/blender/gpu/intern/gpu_capabilities.cc

@@ -102,6 +102,11 @@ bool GPU_crappy_amd_driver(void)
   return GCaps.broken_amd_driver;
 }
 
+bool GPU_use_hq_normals_workaround(void)
+{
+  return GCaps.use_hq_normals_workaround;
+}
+
 bool GPU_shader_image_load_store_support(void)
 {
   return GCaps.shader_image_load_store_support;

source/blender/gpu/intern/gpu_capabilities_private.hh

@@ -48,6 +48,7 @@ struct GPUCapabilities {
   bool depth_blitting_workaround = false;
   bool use_main_context_workaround = false;
   bool broken_amd_driver = false;
+  bool use_hq_normals_workaround = false;
   /* Vulkan related workarounds. */
 };