Metal: Minimum per-vertex stride, 3D texture size + Transform feedback GPUCapabilities expansion.

- Adding in compatibility paths to support minimum per-vertex strides for vertex formats. OpenGL supports a minimum stride of 1 byte, in Metal, this minimum stride is 4 bytes. Meaing a vertex format must be atleast 4-bytes in size.

- Replacing transform feedback compile-time check to conditional look-up, given TF is supported on macOS with Metal.

- 3D texture size safety check added as a general capability, rather than being in the gl backend only. Also required for Metal.

Authored by Apple: Michael Parkin-White

Ref T96261

Reviewed By: fclem

Maniphest Tasks: T96261

Differential Revision: https://developer.blender.org/D14510

1 files changed, 12 insertions, 4 deletions

diff --git a/source/blender/gpu/GPU_vertex_buffer.h b/source/blender/gpu/GPU_vertex_buffer.h
index 722ef878271..d3c1bd8145d 100644
--- a/source/blender/gpu/GPU_vertex_buffer.h
+++ b/source/blender/gpu/GPU_vertex_buffer.h
@@ -40,12 +40,20 @@ extern "C" {
 
 typedef enum {
   /* can be extended to support more types */
-  GPU_USAGE_STREAM,
-  GPU_USAGE_STATIC, /* do not keep data in memory */
-  GPU_USAGE_DYNAMIC,
-  GPU_USAGE_DEVICE_ONLY, /* Do not do host->device data transfers. */
+  GPU_USAGE_STREAM = 0,
+  GPU_USAGE_STATIC = 1, /* do not keep data in memory */
+  GPU_USAGE_DYNAMIC = 2,
+  GPU_USAGE_DEVICE_ONLY = 3, /* Do not do host->device data transfers. */
+
+  /** Extended usage flags. */
+  /* Flag for vertex buffers used for textures. Skips additional padding/compaction to ensure
+   * format matches the texture exactly. Can be masked with other properties, and is stripped
+   * during VertBuf::init. */
+  GPU_USAGE_FLAG_BUFFER_TEXTURE_ONLY = 1 << 3,
 } GPUUsageType;
 
+ENUM_OPERATORS(GPUUsageType, GPU_USAGE_FLAG_BUFFER_TEXTURE_ONLY);
+
 /** Opaque type hiding blender::gpu::VertBuf. */
 typedef struct GPUVertBuf GPUVertBuf;