df1fe18ed7
Line Loop topology support for cutting tool and add support for packing several vertex attributes across individual pixels within a texture buffer. Authored by Apple: Michael Parkin-White Ref T96261 Reviewed By: fclem Maniphest Tasks: T96261 Differential Revision: https://developer.blender.org/D16783
101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup gpu
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*
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* Encapsulation of Frame-buffer states (attached textures, viewport, scissors).
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*/
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#pragma once
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#include "BLI_assert.h"
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#include "GPU_primitive.h"
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#include <Metal/Metal.h>
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namespace blender::gpu {
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/** Utility functions **/
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static inline MTLPrimitiveTopologyClass mtl_prim_type_to_topology_class(MTLPrimitiveType prim_type)
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{
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switch (prim_type) {
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case MTLPrimitiveTypePoint:
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return MTLPrimitiveTopologyClassPoint;
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case MTLPrimitiveTypeLine:
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case MTLPrimitiveTypeLineStrip:
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return MTLPrimitiveTopologyClassLine;
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case MTLPrimitiveTypeTriangle:
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case MTLPrimitiveTypeTriangleStrip:
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return MTLPrimitiveTopologyClassTriangle;
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}
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return MTLPrimitiveTopologyClassUnspecified;
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}
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static inline MTLPrimitiveType gpu_prim_type_to_metal(GPUPrimType prim_type)
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{
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switch (prim_type) {
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case GPU_PRIM_POINTS:
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return MTLPrimitiveTypePoint;
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case GPU_PRIM_LINES:
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case GPU_PRIM_LINES_ADJ:
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return MTLPrimitiveTypeLine;
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case GPU_PRIM_LINE_STRIP:
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case GPU_PRIM_LINE_STRIP_ADJ:
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case GPU_PRIM_LINE_LOOP:
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return MTLPrimitiveTypeLineStrip;
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case GPU_PRIM_TRIS:
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case GPU_PRIM_TRI_FAN:
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case GPU_PRIM_TRIS_ADJ:
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return MTLPrimitiveTypeTriangle;
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case GPU_PRIM_TRI_STRIP:
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return MTLPrimitiveTypeTriangleStrip;
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case GPU_PRIM_NONE:
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return MTLPrimitiveTypePoint;
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};
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}
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/* Certain primitive types are not supported in Metal, and require emulation.
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* `GPU_PRIM_LINE_LOOP` and `GPU_PRIM_TRI_FAN` required index buffer patching.
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* Adjacency types do not need emulation as the input structure is the same,
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* and access is controlled from the vertex shader through SSBO vertex fetch.
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* -- These Adj cases are only used in geometry shaders in OpenGL. */
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static inline bool mtl_needs_topology_emulation(GPUPrimType prim_type)
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{
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BLI_assert(prim_type != GPU_PRIM_NONE);
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switch (prim_type) {
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case GPU_PRIM_LINE_LOOP:
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case GPU_PRIM_TRI_FAN:
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return true;
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default:
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return false;
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}
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return false;
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}
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static inline bool mtl_vertex_count_fits_primitive_type(uint32_t vertex_count,
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MTLPrimitiveType prim_type)
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{
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if (vertex_count == 0) {
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return false;
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}
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switch (prim_type) {
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case MTLPrimitiveTypeLineStrip:
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return (vertex_count > 1);
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case MTLPrimitiveTypeLine:
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return (vertex_count % 2 == 0);
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case MTLPrimitiveTypePoint:
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return (vertex_count > 0);
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case MTLPrimitiveTypeTriangle:
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return (vertex_count % 3 == 0);
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case MTLPrimitiveTypeTriangleStrip:
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return (vertex_count > 2);
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}
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BLI_assert(false);
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return false;
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}
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} // namespace blender::gpu
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