Differential D15563 Diff 55217 source/blender/gpu/metal/mtl_primitive.hh

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source/blender/gpu/metal/mtl_primitive.hh

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				/* SPDX-License-Identifier: GPL-2.0-or-later */

				/** \file
				* \ingroup gpu
				*
				* Encapsulation of Frame-buffer states (attached textures, viewport, scissors).
				*/

				#pragma once

				#include "BLI_assert.h"

				#include "GPU_primitive.h"

				#include <Metal/Metal.h>

				namespace blender::gpu {

				/ Utility functions /
				static inline MTLPrimitiveTopologyClass mtl_prim_type_to_topology_class(MTLPrimitiveType prim_type)
				{
				switch (prim_type) {
				case MTLPrimitiveTypePoint:
				return MTLPrimitiveTopologyClassPoint;
				case MTLPrimitiveTypeLine:
				case MTLPrimitiveTypeLineStrip:
				return MTLPrimitiveTopologyClassLine;
				case MTLPrimitiveTypeTriangle:
				case MTLPrimitiveTypeTriangleStrip:
				return MTLPrimitiveTopologyClassTriangle;
				}
				return MTLPrimitiveTopologyClassUnspecified;
				}

				static inline MTLPrimitiveType gpu_prim_type_to_metal(GPUPrimType prim_type)
				{
				switch (prim_type) {
				case GPU_PRIM_POINTS:
				return MTLPrimitiveTypePoint;
				case GPU_PRIM_LINES:
				case GPU_PRIM_LINES_ADJ:
				case GPU_PRIM_LINE_LOOP:
				return MTLPrimitiveTypeLine;
				case GPU_PRIM_LINE_STRIP:
				case GPU_PRIM_LINE_STRIP_ADJ:
				return MTLPrimitiveTypeLineStrip;
				case GPU_PRIM_TRIS:
				case GPU_PRIM_TRI_FAN:
				case GPU_PRIM_TRIS_ADJ:
				return MTLPrimitiveTypeTriangle;
				case GPU_PRIM_TRI_STRIP:
				return MTLPrimitiveTypeTriangleStrip;
				case GPU_PRIM_NONE:
				return MTLPrimitiveTypePoint;
				};
				}

				/* Certain primitive types are not supported in Metal, and require emulation.
				* `GPU_PRIM_LINE_LOOP` and `GPU_PRIM_TRI_FAN` required index buffer patching.
				* Adjacency types do not need emulation as the input structure is the same,
				* and access is controlled from the vertex shader through SSBO vertex fetch.
				* -- These Adj cases are only used in geometry shaders in OpenGL. */
				static inline bool mtl_needs_topology_emulation(GPUPrimType prim_type)
				{

				BLI_assert(prim_type != GPU_PRIM_NONE);
				switch (prim_type) {
				case GPU_PRIM_LINE_LOOP:
				case GPU_PRIM_TRI_FAN:
				return true;
				default:
				return false;
				}
				return false;
				}

				static inline bool mtl_vertex_count_fits_primitive_type(uint32_t vertex_count,
				MTLPrimitiveType prim_type)
				{
				if (vertex_count == 0) {
				return false;
				}

				switch (prim_type) {
				case MTLPrimitiveTypeLineStrip:
				return (vertex_count > 1);
				case MTLPrimitiveTypeLine:
				return (vertex_count % 2 == 0);
				case MTLPrimitiveTypePoint:
				return (vertex_count > 0);
				case MTLPrimitiveTypeTriangle:
				return (vertex_count % 3 == 0);
				case MTLPrimitiveTypeTriangleStrip:
				return (vertex_count > 2);
				}
				BLI_assert(false);
				return false;
				}

				} // namespace blender::gpu
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