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Differential D4430 Diff 19414 ps/trunk/source/renderer/VertexBufferManager.cpp

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ps/trunk/source/renderer/VertexBufferManager.cpp

/* Copyright (C) 2021 Wildfire Games. /* Copyright (C) 2022 Wildfire Games.
* This file is part of 0 A.D. * This file is part of 0 A.D.
* *
* 0 A.D. is free software: you can redistribute it and/or modify * 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by * it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or * the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version. * (at your option) any later version.
* *
* 0 A.D. is distributed in the hope that it will be useful, * 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of * but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details. * GNU General Public License for more details.
* *
* You should have received a copy of the GNU General Public License * You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>. * along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/ */
/*
* Allocate and destroy CVertexBuffers
*/
#include "precompiled.h" #include "precompiled.h"
#include "VertexBufferManager.h" #include "VertexBufferManager.h"
#include "lib/ogl.h" #include "lib/ogl.h"
#include "ps/CLogger.h" #include "ps/CLogger.h"
#define DUMP_VB_STATS 0 // for debugging #define DUMP_VB_STATS 0 // for debugging
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// This avoids the ordering issues that arise when using destructors of // This avoids the ordering issues that arise when using destructors of
// global instances. // global instances.
void CVertexBufferManager::Shutdown() void CVertexBufferManager::Shutdown()
{ {
for (int group = static_cast<int>(Group::DEFAULT); group < static_cast<int>(Group::COUNT); ++group) for (int group = static_cast<int>(Group::DEFAULT); group < static_cast<int>(Group::COUNT); ++group)
m_Buffers[group].clear(); m_Buffers[group].clear();
} }
CVertexBuffer::VBChunk* CVertexBufferManager::Allocate(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target, void* backingStore) /**
{ * AllocateChunk: try to allocate a buffer of given number of vertices (each of
return AllocateImpl(vertexSize, numVertices, usage, target, backingStore, Group::DEFAULT); * given size), with the given type, and using the given texture - return null
} * if no free chunks available
*/
CVertexBufferManager::Handle CVertexBufferManager::AllocateChunk(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target, void* backingStore, Group group) CVertexBufferManager::Handle CVertexBufferManager::AllocateChunk(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target, void* backingStore, Group group)
{ {
CVertexBuffer::VBChunk* chunk = AllocateImpl(vertexSize, numVertices, usage, target, backingStore, group);
if (!chunk)
return Handle();
return Handle(chunk);
}
// Allocate: try to allocate a buffer of given number of vertices (each of
// given size), with the given type, and using the given texture - return null
// if no free chunks available
CVertexBuffer::VBChunk* CVertexBufferManager::AllocateImpl(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target, void* backingStore, Group group)
{
CVertexBuffer::VBChunk* result = nullptr; CVertexBuffer::VBChunk* result = nullptr;
ENSURE(usage == GL_STREAM_DRAW || usage == GL_STATIC_DRAW || usage == GL_DYNAMIC_DRAW); ENSURE(usage == GL_STREAM_DRAW || usage == GL_STATIC_DRAW || usage == GL_DYNAMIC_DRAW);
ENSURE(target == GL_ARRAY_BUFFER || target == GL_ELEMENT_ARRAY_BUFFER); ENSURE(target == GL_ARRAY_BUFFER || target == GL_ELEMENT_ARRAY_BUFFER);
if (CVertexBuffer::UseStreaming(usage)) if (CVertexBuffer::UseStreaming(usage))
ENSURE(backingStore != NULL); ENSURE(backingStore != NULL);
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#endif #endif
// iterate through all existing buffers testing for one that'll // iterate through all existing buffers testing for one that'll
// satisfy the allocation // satisfy the allocation
for (const std::unique_ptr<CVertexBuffer>& buffer : buffers) for (const std::unique_ptr<CVertexBuffer>& buffer : buffers)
{ {
result = buffer->Allocate(vertexSize, numVertices, usage, target, backingStore); result = buffer->Allocate(vertexSize, numVertices, usage, target, backingStore);
if (result) if (result)
return result; return Handle(result);
} }
// got this far; need to allocate a new buffer // got this far; need to allocate a new buffer
buffers.emplace_back( buffers.emplace_back(
group == Group::DEFAULT group == Group::DEFAULT
? std::make_unique<CVertexBuffer>(vertexSize, usage, target) ? std::make_unique<CVertexBuffer>(vertexSize, usage, target)
// Reduces the buffer size for not so frequent buffers. // Reduces the buffer size for not so frequent buffers.
: std::make_unique<CVertexBuffer>(vertexSize, usage, target, 1024 * 1024)); : std::make_unique<CVertexBuffer>(vertexSize, usage, target, 1024 * 1024));
result = buffers.back()->Allocate(vertexSize, numVertices, usage, target, backingStore); result = buffers.back()->Allocate(vertexSize, numVertices, usage, target, backingStore);
if (!result) if (!result)
{ {
LOGERROR("Failed to create VBOs (%zu*%zu)", vertexSize, numVertices); LOGERROR("Failed to create VBOs (%zu*%zu)", vertexSize, numVertices);
return Handle();
} }
return result; return Handle(result);
} }
void CVertexBufferManager::Release(CVertexBuffer::VBChunk* chunk) void CVertexBufferManager::Release(CVertexBuffer::VBChunk* chunk)
{ {
ENSURE(chunk); ENSURE(chunk);
#if DUMP_VB_STATS #if DUMP_VB_STATS
debug_printf("\n============================\n# release %p nverts=%zu\n\n", chunk, chunk->m_Count); debug_printf("\n============================\n# release %p nverts=%zu\n\n", chunk, chunk->m_Count);
#endif #endif
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