GPU: Disable SSBO support from commandline.

In heavy scenes containing many hairs/curves and volumetrics
using SSBO can overwrite the binding information of the volumetric
resolve shader. This has been detected during project Heist and is
only reproducable on NVIDIA platform.

This patch adds an debug option to disable SSBOs from the command
line to replace the --debug-gpu-force-workarounds that has been
used as a workaround on the render farm. Reason is that
force workarounds will also add other limitations as well (number
of texture binds for example)

3 files changed, 25 insertions, 9 deletions

diff --git a/source/blender/blenkernel/BKE_global.h b/source/blender/blenkernel/BKE_global.h
index e28c87cd7d6..f3acb7d3746 100644
--- a/source/blender/blenkernel/BKE_global.h
+++ b/source/blender/blenkernel/BKE_global.h
@@ -189,15 +189,16 @@ enum {
                                              * assigned to ID datablocks */
   G_DEBUG_DEPSGRAPH = (G_DEBUG_DEPSGRAPH_BUILD | G_DEBUG_DEPSGRAPH_EVAL | G_DEBUG_DEPSGRAPH_TAG |
                        G_DEBUG_DEPSGRAPH_TIME | G_DEBUG_DEPSGRAPH_UUID),
-  G_DEBUG_SIMDATA = (1 << 15),               /* sim debug data display */
-  G_DEBUG_GPU = (1 << 16),                   /* gpu debug */
-  G_DEBUG_IO = (1 << 17),                    /* IO Debugging (for Collada, ...). */
-  G_DEBUG_GPU_FORCE_WORKAROUNDS = (1 << 18), /* force gpu workarounds bypassing detections. */
-  G_DEBUG_XR = (1 << 19),                    /* XR/OpenXR messages */
-  G_DEBUG_XR_TIME = (1 << 20),               /* XR/OpenXR timing messages */
-
-  G_DEBUG_GHOST = (1 << 21),  /* Debug GHOST module. */
-  G_DEBUG_WINTAB = (1 << 22), /* Debug Wintab. */
+  G_DEBUG_SIMDATA = (1 << 15),                /* sim debug data display */
+  G_DEBUG_GPU = (1 << 16),                    /* gpu debug */
+  G_DEBUG_IO = (1 << 17),                     /* IO Debugging (for Collada, ...). */
+  G_DEBUG_GPU_FORCE_WORKAROUNDS = (1 << 18),  /* force gpu workarounds bypassing detections. */
+  G_DEBUG_GPU_FORCE_DISABLE_SSBO = (1 << 19), /* force disabling usage of SSBO's */
+  G_DEBUG_XR = (1 << 20),                     /* XR/OpenXR messages */
+  G_DEBUG_XR_TIME = (1 << 21),                /* XR/OpenXR timing messages */
+
+  G_DEBUG_GHOST = (1 << 22),  /* Debug GHOST module. */
+  G_DEBUG_WINTAB = (1 << 23), /* Debug Wintab. */
 };
 
 #define G_DEBUG_ALL \
diff --git a/source/blender/gpu/opengl/gl_backend.cc b/source/blender/gpu/opengl/gl_backend.cc
index 9051003bcd5..49a2321af98 100644
--- a/source/blender/gpu/opengl/gl_backend.cc
+++ b/source/blender/gpu/opengl/gl_backend.cc
@@ -431,6 +431,12 @@ static void detect_workarounds()
   /* Minimum Per-Vertex stride is 1 byte for OpenGL. */
   GCaps.minimum_per_vertex_stride = 1;
 
+  /* Force disable per feature. */
+  if (G.debug & G_DEBUG_GPU_FORCE_DISABLE_SSBO) {
+    printf("\n");
+    printf("GL: Force disabling SSBO support from commandline arguments.\n");
+    GCaps.shader_storage_buffer_objects_support = false;
+  }
 }  // namespace blender::gpu
 
 /** Internal capabilities. */
diff --git a/source/creator/creator_args.c b/source/creator/creator_args.c
index fe2e14e0367..e0fea8a4686 100644
--- a/source/creator/creator_args.c
+++ b/source/creator/creator_args.c
@@ -579,6 +579,7 @@ static int arg_handle_print_help(int UNUSED(argc), const char **UNUSED(argv), vo
   BLI_args_print_arg_doc(ba, "--debug-wintab");
   BLI_args_print_arg_doc(ba, "--debug-gpu");
   BLI_args_print_arg_doc(ba, "--debug-gpu-force-workarounds");
+  BLI_args_print_arg_doc(ba, "--debug-gpu-disable-ssbo");
   BLI_args_print_arg_doc(ba, "--debug-wm");
 #  ifdef WITH_XR_OPENXR
   BLI_args_print_arg_doc(ba, "--debug-xr");
@@ -990,6 +991,9 @@ static const char arg_handle_debug_mode_generic_set_doc_depsgraph_uuid[] =
 static const char arg_handle_debug_mode_generic_set_doc_gpu_force_workarounds[] =
     "\n\t"
     "Enable workarounds for typical GPU issues and disable all GPU extensions.";
+static const char arg_handle_debug_mode_generic_set_doc_gpu_disable_ssbo[] =
+    "\n\t"
+    "Disable usage of shader storage buffer objects.";
 
 static int arg_handle_debug_mode_generic_set(int UNUSED(argc),
                                              const char **UNUSED(argv),
@@ -2212,6 +2216,11 @@ void main_args_setup(bContext *C, bArgs *ba)
                "--debug-gpu-force-workarounds",
                CB_EX(arg_handle_debug_mode_generic_set, gpu_force_workarounds),
                (void *)G_DEBUG_GPU_FORCE_WORKAROUNDS);
+  BLI_args_add(ba,
+               NULL,
+               "--debug-gpu-disable-ssbo",
+               CB_EX(arg_handle_debug_mode_generic_set, gpu_disable_ssbo),
+               (void *)G_DEBUG_GPU_FORCE_DISABLE_SSBO);
   BLI_args_add(ba, NULL, "--debug-exit-on-error", CB(arg_handle_debug_exit_on_error), NULL);
 
   BLI_args_add(ba, NULL, "--verbose", CB(arg_handle_verbosity_set), NULL);