Metal: Initial Implementation of Metal Backend for GPU Module.

Adding WITH_METAL option to CMAKE to guard compilation for macOS only. Implemented stub METALBackend to mirror GPUBackend interface and added capabilities initialisation, along with API initialisation paths.

Global rendering coordination commands added to backend with GPU_render_begin and GPU_render_end() commands globally wrapping GPU work. This is required for Metal to ensure temporary resources are generated within an NSAutoReleasePool and freed accordingly.

Authored by Apple: Michael Parkin-White, Vil Harvey, Marco Giordano, Michael Jones, Morteza Mostajabodaveh, Jason Fielder

Ref T96261

Reviewed By: fclem

Maniphest Tasks: T96261

Differential Revision: https://developer.blender.org/D14293

1 files changed, 9 insertions, 5 deletions

diff --git a/source/blender/gpu/GPU_context.h b/source/blender/gpu/GPU_context.h
index 85433913456..453c117501d 100644
--- a/source/blender/gpu/GPU_context.h
+++ b/source/blender/gpu/GPU_context.h
@@ -11,18 +11,15 @@
 
 #include "GPU_batch.h"
 #include "GPU_common.h"
+#include "GPU_platform.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-typedef enum eGPUBackendType {
-  GPU_BACKEND_NONE = 0,
-  GPU_BACKEND_OPENGL,
-} eGPUBackendType;
-
 void GPU_backend_init(eGPUBackendType backend);
 void GPU_backend_exit(void);
+bool GPU_backend_supported(eGPUBackendType type);
 
 eGPUBackendType GPU_backend_get_type(void);
 
@@ -49,6 +46,13 @@ GPUContext *GPU_context_active_get(void);
 void GPU_context_main_lock(void);
 void GPU_context_main_unlock(void);
 
+/* GPU Begin/end work blocks */
+void GPU_render_begin();
+void GPU_render_end();
+
+/* For operations which need to run exactly once per frame -- even if there are no render updates. */
+void GPU_render_step();
+
 #ifdef __cplusplus
 }
 #endif