72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2014 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_UI_GL_CIRCULAR_BUFFER_H_
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#define XENIA_UI_GL_CIRCULAR_BUFFER_H_
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#include <unordered_map>
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#include "xenia/ui/gl/gl.h"
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namespace xe {
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namespace ui {
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namespace gl {
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// TODO(benvanik): uh, make this circular.
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// TODO(benvanik): fences to prevent this from ever flushing.
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class CircularBuffer {
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public:
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CircularBuffer(size_t capacity, size_t alignment = 256);
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~CircularBuffer();
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struct Allocation {
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void* host_ptr;
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GLuint64 gpu_ptr;
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size_t offset;
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size_t length;
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size_t aligned_length;
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uint64_t cache_key; // 0 if caching disabled.
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};
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bool Initialize();
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void Shutdown();
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GLuint handle() const { return buffer_; }
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GLuint64 gpu_handle() const { return gpu_base_; }
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size_t capacity() const { return capacity_; }
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bool CanAcquire(size_t length);
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Allocation Acquire(size_t length);
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bool AcquireCached(uint32_t key, size_t length, Allocation* out_allocation);
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void Discard(Allocation allocation);
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void Commit(Allocation allocation);
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void Flush();
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void ClearCache();
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void WaitUntilClean();
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private:
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size_t capacity_;
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size_t alignment_;
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uintptr_t write_head_;
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uintptr_t dirty_start_;
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uintptr_t dirty_end_;
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GLuint buffer_;
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GLuint64 gpu_base_;
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uint8_t* host_base_;
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std::unordered_map<uint64_t, uintptr_t> allocation_cache_;
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};
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} // namespace gl
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} // namespace ui
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} // namespace xe
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#endif // XENIA_UI_GL_CIRCULAR_BUFFER_H_
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