GPUStorageBuf: Add `GPU_storagebuf_copy_sub_from_vertbuf()`

This allows using the Graphic API to copy buffer data.
The GPU module do not expose untyped buffers even if that's what most API
do, so the copy function need to be strongly typed.

Contains GL backend implementation.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_storage_buffer.h b/source/blender/gpu/GPU_storage_buffer.h
index 1478d490e23..739b0784317 100644
--- a/source/blender/gpu/GPU_storage_buffer.h
+++ b/source/blender/gpu/GPU_storage_buffer.h
@@ -47,6 +47,17 @@ void GPU_storagebuf_clear(GPUStorageBuf *ssbo,
                           void *data);
 void GPU_storagebuf_clear_to_zero(GPUStorageBuf *ssbo);
 
+/**
+ * @brief Copy a part of a vertex buffer to a storage buffer.
+ * \a ssbo: destination storage buffer
+ * \a src: source vertex buffer
+ * \a dst_offset: where to start copying to (in bytes).
+ * \a src_offset: where to start copying from (in bytes).
+ * \a copy_size: byte size of the segment to copy.
+ */
+void GPU_storagebuf_copy_sub_from_vertbuf(
+    GPUStorageBuf *ssbo, GPUVertBuf *src, uint dst_offset, uint src_offset, uint copy_size);
+
 #ifdef __cplusplus
 }
 #endif