121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/* Copyright (C) 2013 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* 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
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* encapsulation of VBOs with batching and sharing
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*/
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#ifndef INCLUDED_VERTEXBUFFER
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#define INCLUDED_VERTEXBUFFER
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#include "lib/res/graphics/ogl_tex.h"
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#include <list>
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#include <vector>
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// Absolute maximum (bytewise) size of each GL vertex buffer object.
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// Make it large enough for the maximum feasible mesh size (64K vertexes,
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// 32 bytes per vertex in ShaderModelRenderer).
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// TODO: measure what influence this has on performance
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#define MAX_VB_SIZE_BYTES (4*1024*1024)
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/**
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* CVertexBuffer: encapsulation of ARB_vertex_buffer_object, also supplying
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* some additional functionality for sharing buffers between multiple objects
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*/
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class CVertexBuffer
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{
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NONCOPYABLE(CVertexBuffer);
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public:
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/// VBChunk: describes a portion of this vertex buffer
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struct VBChunk
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{
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/// Owning (parent) vertex buffer
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CVertexBuffer* m_Owner;
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/// Start index of this chunk in owner
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size_t m_Index;
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/// Number of vertices used by chunk
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size_t m_Count;
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private:
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// Only CVertexBuffer can construct/delete these
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// (Other people should use g_VBMan.Allocate, g_VBMan.Release)
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friend class CVertexBuffer;
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VBChunk() {}
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~VBChunk() {}
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};
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public:
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// constructor, destructor
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CVertexBuffer(size_t vertexSize, GLenum usage, GLenum target);
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~CVertexBuffer();
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/// Bind to this buffer; return pointer to address required as parameter
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/// to glVertexPointer ( + etc) calls
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u8* Bind();
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/// Get the address that Bind() will return, without actually binding
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u8* GetBindAddress();
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/// Unbind any currently-bound buffer, so glVertexPointer etc calls will not attempt to use it
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static void Unbind();
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/// Update vertex data for given chunk. Transfers the provided data to the actual OpenGL vertex buffer.
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void UpdateChunkVertices(VBChunk* chunk, void* data);
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size_t GetVertexSize() const { return m_VertexSize; }
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size_t GetBytesReserved() const;
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size_t GetBytesAllocated() const;
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/// Returns true if this vertex buffer is compatible with the specified vertex type and intended usage.
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bool CompatibleVertexType(size_t vertexSize, GLenum usage, GLenum target);
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void DumpStatus();
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protected:
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friend class CVertexBufferManager; // allow allocate only via CVertexBufferManager
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/// Try to allocate a buffer of given number of vertices (each of given size),
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/// and with the given type - return null if no free chunks available
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VBChunk* Allocate(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target);
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/// Return given chunk to this buffer
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void Release(VBChunk* chunk);
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private:
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/// Vertex size of this vertex buffer
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size_t m_VertexSize;
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/// Number of vertices of above size in this buffer
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size_t m_MaxVertices;
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/// List of free chunks in this buffer
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std::list<VBChunk*> m_FreeList;
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/// Available free vertices - total of all free vertices in the free list
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size_t m_FreeVertices;
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/// Handle to the actual GL vertex buffer object
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GLuint m_Handle;
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/// Raw system memory for systems not supporting VBOs
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u8* m_SysMem;
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/// Usage type of the buffer (GL_STATIC_DRAW etc)
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GLenum m_Usage;
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/// Buffer target (GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER)
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GLenum m_Target;
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};
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#endif
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