mirror of https://github.com/PCSX2/pcsx2.git
358 lines
9.5 KiB
C++
358 lines
9.5 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2021 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "StreamBuffer.h"
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#include "common/Align.h"
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#include "common/AlignedMalloc.h"
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#include "common/Assertions.h"
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#include <array>
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#include <cstring>
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namespace GL
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{
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StreamBuffer::StreamBuffer(GLenum target, GLuint buffer_id, u32 size)
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: m_target(target)
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, m_buffer_id(buffer_id)
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, m_size(size)
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{
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}
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StreamBuffer::~StreamBuffer()
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{
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glDeleteBuffers(1, &m_buffer_id);
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}
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void StreamBuffer::Bind()
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{
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glBindBuffer(m_target, m_buffer_id);
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}
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void StreamBuffer::Unbind()
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{
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glBindBuffer(m_target, 0);
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}
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namespace detail
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{
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// Uses glBufferSubData() to update. Preferred for drivers which don't support {ARB,EXT}_buffer_storage.
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class BufferSubDataStreamBuffer final : public StreamBuffer
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{
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public:
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~BufferSubDataStreamBuffer() override
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{
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_aligned_free(m_cpu_buffer);
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}
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MappingResult Map(u32 alignment, u32 min_size) override
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{
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return MappingResult{static_cast<void*>(m_cpu_buffer), 0, 0, m_size / alignment};
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}
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void Unmap(u32 used_size) override
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{
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if (used_size == 0)
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return;
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glBindBuffer(m_target, m_buffer_id);
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glBufferSubData(m_target, 0, used_size, m_cpu_buffer);
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}
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u32 GetChunkSize() const override
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{
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return m_size;
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}
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static std::unique_ptr<StreamBuffer> Create(GLenum target, u32 size)
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{
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glGetError();
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GLuint buffer_id;
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glGenBuffers(1, &buffer_id);
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glBindBuffer(target, buffer_id);
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glBufferData(target, size, nullptr, GL_STREAM_DRAW);
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GLenum err = glGetError();
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if (err != GL_NO_ERROR)
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{
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glBindBuffer(target, 0);
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glDeleteBuffers(1, &buffer_id);
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return {};
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}
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return std::unique_ptr<StreamBuffer>(new BufferSubDataStreamBuffer(target, buffer_id, size));
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}
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private:
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BufferSubDataStreamBuffer(GLenum target, GLuint buffer_id, u32 size)
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: StreamBuffer(target, buffer_id, size)
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{
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m_cpu_buffer = static_cast<u8*>(_aligned_malloc(size, 32));
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if (!m_cpu_buffer)
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pxFailRel("Failed to allocate CPU storage for GL buffer");
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}
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u8* m_cpu_buffer;
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};
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// Uses BufferData() to orphan the buffer after every update. Used on Mali where BufferSubData forces a sync.
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class BufferDataStreamBuffer final : public StreamBuffer
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{
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public:
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~BufferDataStreamBuffer() override
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{
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_aligned_free(m_cpu_buffer);
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}
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MappingResult Map(u32 alignment, u32 min_size) override
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{
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return MappingResult{static_cast<void*>(m_cpu_buffer), 0, 0, m_size / alignment};
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}
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void Unmap(u32 used_size) override
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{
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if (used_size == 0)
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return;
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glBindBuffer(m_target, m_buffer_id);
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glBufferData(m_target, used_size, m_cpu_buffer, GL_STREAM_DRAW);
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}
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u32 GetChunkSize() const override
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{
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return m_size;
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}
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static std::unique_ptr<StreamBuffer> Create(GLenum target, u32 size)
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{
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glGetError();
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GLuint buffer_id;
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glGenBuffers(1, &buffer_id);
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glBindBuffer(target, buffer_id);
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glBufferData(target, size, nullptr, GL_STREAM_DRAW);
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GLenum err = glGetError();
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if (err != GL_NO_ERROR)
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{
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glBindBuffer(target, 0);
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glDeleteBuffers(1, &buffer_id);
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return {};
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}
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return std::unique_ptr<StreamBuffer>(new BufferDataStreamBuffer(target, buffer_id, size));
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}
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private:
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BufferDataStreamBuffer(GLenum target, GLuint buffer_id, u32 size)
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: StreamBuffer(target, buffer_id, size)
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{
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m_cpu_buffer = static_cast<u8*>(_aligned_malloc(size, 32));
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if (!m_cpu_buffer)
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pxFailRel("Failed to allocate CPU storage for GL buffer");
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}
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u8* m_cpu_buffer;
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};
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// Base class for implementations which require syncing.
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class SyncingStreamBuffer : public StreamBuffer
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{
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public:
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enum : u32
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{
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NUM_SYNC_POINTS = 16
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};
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virtual ~SyncingStreamBuffer() override
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{
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for (u32 i = m_available_block_index; i <= m_used_block_index; i++)
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{
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pxAssert(m_sync_objects[i]);
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glDeleteSync(m_sync_objects[i]);
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}
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}
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protected:
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SyncingStreamBuffer(GLenum target, GLuint buffer_id, u32 size)
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: StreamBuffer(target, buffer_id, size)
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, m_bytes_per_block((size + (NUM_SYNC_POINTS)-1) / NUM_SYNC_POINTS)
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{
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}
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__fi u32 GetSyncIndexForOffset(u32 offset) { return offset / m_bytes_per_block; }
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__fi void AddSyncsForOffset(u32 offset)
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{
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const u32 end = GetSyncIndexForOffset(offset);
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for (; m_used_block_index < end; m_used_block_index++)
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{
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pxAssert(!m_sync_objects[m_used_block_index]);
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m_sync_objects[m_used_block_index] = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
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}
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}
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__fi void WaitForSync(GLsync& sync)
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{
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glClientWaitSync(sync, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
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glDeleteSync(sync);
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sync = nullptr;
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}
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__fi void EnsureSyncsWaitedForOffset(u32 offset)
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{
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const u32 end = std::min<u32>(GetSyncIndexForOffset(offset) + 1, NUM_SYNC_POINTS);
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for (; m_available_block_index < end; m_available_block_index++)
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{
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pxAssert(m_sync_objects[m_available_block_index]);
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WaitForSync(m_sync_objects[m_available_block_index]);
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}
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}
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void AllocateSpace(u32 size)
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{
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// add sync objects for writes since the last allocation
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AddSyncsForOffset(m_position);
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// wait for sync objects for the space we want to use
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EnsureSyncsWaitedForOffset(m_position + size);
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// wrap-around?
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if ((m_position + size) > m_size)
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{
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// current position ... buffer end
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AddSyncsForOffset(m_size);
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// rewind, and try again
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m_position = 0;
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// wait for the sync at the start of the buffer
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WaitForSync(m_sync_objects[0]);
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m_available_block_index = 1;
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// and however much more we need to satisfy the allocation
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EnsureSyncsWaitedForOffset(size);
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m_used_block_index = 0;
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}
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}
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u32 GetChunkSize() const override
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{
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return m_size / NUM_SYNC_POINTS;
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}
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u32 m_position = 0;
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u32 m_used_block_index = 0;
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u32 m_available_block_index = NUM_SYNC_POINTS;
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u32 m_bytes_per_block;
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std::array<GLsync, NUM_SYNC_POINTS> m_sync_objects{};
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};
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class BufferStorageStreamBuffer : public SyncingStreamBuffer
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{
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public:
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~BufferStorageStreamBuffer() override
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{
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glBindBuffer(m_target, m_buffer_id);
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glUnmapBuffer(m_target);
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glBindBuffer(m_target, 0);
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}
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MappingResult Map(u32 alignment, u32 min_size) override
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{
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if (m_position > 0)
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m_position = Common::AlignUp(m_position, alignment);
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AllocateSpace(min_size);
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pxAssert((m_position + min_size) <= (m_available_block_index * m_bytes_per_block));
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const u32 free_space_in_block = ((m_available_block_index * m_bytes_per_block) - m_position);
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return MappingResult{static_cast<void*>(m_mapped_ptr + m_position), m_position, m_position / alignment,
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free_space_in_block / alignment};
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}
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void Unmap(u32 used_size) override
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{
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pxAssert((m_position + used_size) <= m_size);
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if (!m_coherent)
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{
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Bind();
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glFlushMappedBufferRange(m_target, m_position, used_size);
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}
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m_position += used_size;
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}
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static std::unique_ptr<StreamBuffer> Create(GLenum target, u32 size, bool coherent = true)
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{
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glGetError();
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GLuint buffer_id;
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glGenBuffers(1, &buffer_id);
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glBindBuffer(target, buffer_id);
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const u32 flags = GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | (coherent ? GL_MAP_COHERENT_BIT : 0);
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const u32 map_flags = GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | (coherent ? 0 : GL_MAP_FLUSH_EXPLICIT_BIT);
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if (GLAD_GL_VERSION_4_4 || GLAD_GL_ARB_buffer_storage)
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glBufferStorage(target, size, nullptr, flags);
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else if (GLAD_GL_EXT_buffer_storage)
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glBufferStorageEXT(target, size, nullptr, flags);
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GLenum err = glGetError();
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if (err != GL_NO_ERROR)
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{
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glBindBuffer(target, 0);
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glDeleteBuffers(1, &buffer_id);
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return {};
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}
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u8* mapped_ptr = static_cast<u8*>(glMapBufferRange(target, 0, size, map_flags));
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pxAssertRel(mapped_ptr, "Persistent buffer was mapped");
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return std::unique_ptr<StreamBuffer>(new BufferStorageStreamBuffer(target, buffer_id, size, mapped_ptr, coherent));
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}
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private:
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BufferStorageStreamBuffer(GLenum target, GLuint buffer_id, u32 size, u8* mapped_ptr, bool coherent)
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: SyncingStreamBuffer(target, buffer_id, size)
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, m_mapped_ptr(mapped_ptr)
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, m_coherent(coherent)
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{
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}
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u8* m_mapped_ptr;
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bool m_coherent;
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};
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} // namespace detail
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std::unique_ptr<StreamBuffer> StreamBuffer::Create(GLenum target, u32 size)
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{
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std::unique_ptr<StreamBuffer> buf;
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if (GLAD_GL_VERSION_4_4 || GLAD_GL_ARB_buffer_storage || GLAD_GL_EXT_buffer_storage)
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{
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buf = detail::BufferStorageStreamBuffer::Create(target, size);
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if (buf)
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return buf;
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}
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// BufferSubData is slower on all drivers except NVIDIA...
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const char* vendor = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
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if (std::strstr(vendor, "NVIDIA"))
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return detail::BufferSubDataStreamBuffer::Create(target, size);
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else
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return detail::BufferDataStreamBuffer::Create(target, size);
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}
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} // namespace GL
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