GPUStorageBuf: Add `read()` function to readback buffer data to host

This is not expected to be fast. This is only for inspecting the content
of the buffer for debugging or validation purpose.

2 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_storage_buffer.cc b/source/blender/gpu/intern/gpu_storage_buffer.cc
index afa27da9c85..460a643089c 100644
--- a/source/blender/gpu/intern/gpu_storage_buffer.cc
+++ b/source/blender/gpu/intern/gpu_storage_buffer.cc
@@ -109,4 +109,9 @@ void GPU_storagebuf_copy_sub_from_vertbuf(
   unwrap(ssbo)->copy_sub(unwrap(src), dst_offset, src_offset, copy_size);
 }
 
+void GPU_storagebuf_read(GPUStorageBuf *ssbo, void *data)
+{
+  unwrap(ssbo)->read(data);
+}
+
 /** \} */
diff --git a/source/blender/gpu/intern/gpu_storage_buffer_private.hh b/source/blender/gpu/intern/gpu_storage_buffer_private.hh
index 9baec0c2a77..0c96f97ad30 100644
--- a/source/blender/gpu/intern/gpu_storage_buffer_private.hh
+++ b/source/blender/gpu/intern/gpu_storage_buffer_private.hh
@@ -44,6 +44,7 @@ class StorageBuf {
                      eGPUDataFormat data_format,
                      void *data) = 0;
   virtual void copy_sub(VertBuf *src, uint dst_offset, uint src_offset, uint copy_size) = 0;
+  virtual void read(void *data) = 0;
 };
 
 /* Syntactic sugar. */