Disable GPU subdivision if the maximum number of SSBO binding is reached

Some old platforms and drivers have limited amount of SSBO binding per
compute shader. This disables GPU subdivision if we cannot possibly
bind all required buffers within this limit.

For now the maximum number of buffers used by the GPU code is hardcoded,
but will be programmatically detected when shader creation is automated.

Ref D14337

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/subdiv_modifier.c b/source/blender/blenkernel/intern/subdiv_modifier.c
index 34dfdaf7595..83772f153d9 100644
--- a/source/blender/blenkernel/intern/subdiv_modifier.c
+++ b/source/blender/blenkernel/intern/subdiv_modifier.c
@@ -77,6 +77,10 @@ static bool is_subdivision_evaluation_possible_on_gpu(void)
     return false;
   }
 
+  if (GPU_max_shader_storage_buffer_bindings() < MAX_GPU_SUBDIV_SSBOS) {
+    return false;
+  }
+
   const int available_evaluators = openSubdiv_getAvailableEvaluators();
   if ((available_evaluators & OPENSUBDIV_EVALUATOR_GLSL_COMPUTE) == 0) {
     return false;