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/** \file
* \ingroup gpu
*/
#pragma once
#include "MEM_guardedalloc.h"
#include "gpu_index_buffer_private.hh"
#include "mtl_context.hh"
#include <Cocoa/Cocoa.h>
#include <Metal/Metal.h>
#include <QuartzCore/QuartzCore.h>
namespace blender::gpu {
class MTLIndexBuf : public IndexBuf {
friend class MTLBatch;
friend class MTLDrawList;
private:
/* Metal buffer resource. */
gpu::MTLBuffer *ibo_ = nullptr;
uint64_t alloc_size_ = 0;
#ifndef NDEBUG
/* Flags whether point index buffer has been compacted
* to remove false restart indices. */
bool point_restarts_stripped_ = false;
#endif
/* Optimized index buffers.
* NOTE(Metal): This optimization encodes a new index buffer following
* #TriangleList topology. Parsing of Index buffers is more optimal
* when not using restart-compatible primitive topology types. */
GPUPrimType optimized_primitive_type_;
gpu::MTLBuffer *optimized_ibo_ = nullptr;
uint32_t emulated_v_count = 0;
void free_optimized_buffer();
/* Flags whether an index buffer can be optimized.
* For index buffers which are partially modified
* on the host, or by the GPU, optimization cannot be performed. */
bool can_optimize_ = true;
public:
~MTLIndexBuf();
void bind_as_ssbo(uint32_t binding) override;
const uint32_t *read() const override;
void upload_data() override;
void update_sub(uint32_t start, uint32_t len, const void *data) override;
/* #get_index_buffer can conditionally return an optimized index buffer of a
* differing format, if it is concluded that optimization is preferred
* for the given inputs.
* Index buffer optimization is used to replace restart-compatible
* primitive types with non-restart-compatible ones such as #TriangleList and
* #LineList. This improves GPU execution for these types significantly, while
* only incurring a small performance penalty.
*
* This is also used to emulate unsupported topology types
* such as triangle fan. */
id<MTLBuffer> get_index_buffer(GPUPrimType &in_out_primitive_type, uint &in_out_v_count);
void flag_can_optimize(bool can_optimize);
static MTLIndexType gpu_index_type_to_metal(GPUIndexBufType type)
{
return (type == GPU_INDEX_U16) ? MTLIndexTypeUInt16 : MTLIndexTypeUInt32;
}
private:
void strip_restart_indices() override;
MEM_CXX_CLASS_ALLOC_FUNCS("MTLIndexBuf")
};
} // namespace blender::gpu
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