kicad/common/gal/opengl/cached_container_gpu.cpp

254 lines
7.6 KiB
C++

/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright 2013-2017 CERN
* @author Maciej Suminski <maciej.suminski@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <gal/opengl/cached_container_gpu.h>
#include <gal/opengl/vertex_manager.h>
#include <gal/opengl/vertex_item.h>
#include <gal/opengl/shader.h>
#include <gal/opengl/utils.h>
#include <list>
#ifdef __WXDEBUG__
#include <wx/log.h>
#include <profile.h>
#endif /* __WXDEBUG__ */
using namespace KIGFX;
CACHED_CONTAINER_GPU::CACHED_CONTAINER_GPU( unsigned int aSize ) :
CACHED_CONTAINER( aSize ), m_isMapped( false ), m_glBufferHandle( -1 )
{
m_useCopyBuffer = GLEW_ARB_copy_buffer;
glGenBuffers( 1, &m_glBufferHandle );
glBindBuffer( GL_ARRAY_BUFFER, m_glBufferHandle );
glBufferData( GL_ARRAY_BUFFER, m_currentSize * VERTEX_SIZE, NULL, GL_DYNAMIC_DRAW );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
checkGlError( "allocating video memory for cached container" );
}
CACHED_CONTAINER_GPU::~CACHED_CONTAINER_GPU()
{
if( m_isMapped )
Unmap();
glDeleteBuffers( 1, &m_glBufferHandle );
}
void CACHED_CONTAINER_GPU::Map()
{
wxCHECK( !IsMapped(), /*void*/ );
glBindBuffer( GL_ARRAY_BUFFER, m_glBufferHandle );
m_vertices = static_cast<VERTEX*>( glMapBuffer( GL_ARRAY_BUFFER, GL_READ_WRITE ) );
if( checkGlError( "mapping vertices buffer" ) == GL_NO_ERROR )
m_isMapped = true;
}
void CACHED_CONTAINER_GPU::Unmap()
{
wxCHECK( IsMapped(), /*void*/ );
glUnmapBuffer( GL_ARRAY_BUFFER );
checkGlError( "unmapping vertices buffer" );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
m_vertices = NULL;
checkGlError( "unbinding vertices buffer" );
m_isMapped = false;
}
bool CACHED_CONTAINER_GPU::defragmentResize( unsigned int aNewSize )
{
if( !m_useCopyBuffer )
return defragmentResizeMemcpy( aNewSize );
wxCHECK( IsMapped(), false );
wxLogTrace( "GAL_CACHED_CONTAINER_GPU",
wxT( "Resizing & defragmenting container from %d to %d" ), m_currentSize, aNewSize );
// No shrinking if we cannot fit all the data
if( usedSpace() > aNewSize )
return false;
#ifdef __WXDEBUG__
PROF_COUNTER totalTime;
#endif /* __WXDEBUG__ */
GLuint newBuffer;
// glCopyBufferSubData requires a buffer to be unmapped
glUnmapBuffer( GL_ARRAY_BUFFER );
// Create a new destination buffer
glGenBuffers( 1, &newBuffer );
// It would be best to use GL_COPY_WRITE_BUFFER here,
// but it is not available everywhere
#ifdef __WXDEBUG__
GLint eaBuffer = -1;
glGetIntegerv( GL_ELEMENT_ARRAY_BUFFER_BINDING, &eaBuffer );
wxASSERT( eaBuffer == 0 );
#endif /* __WXDEBUG__ */
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, newBuffer );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, aNewSize * VERTEX_SIZE, NULL, GL_DYNAMIC_DRAW );
checkGlError( "creating buffer during defragmentation" );
ITEMS::iterator it, it_end;
int newOffset = 0;
// Defragmentation
for( it = m_items.begin(), it_end = m_items.end(); it != it_end; ++it )
{
VERTEX_ITEM* item = *it;
int itemOffset = item->GetOffset();
int itemSize = item->GetSize();
// Move an item to the new container
glCopyBufferSubData( GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
itemOffset * VERTEX_SIZE, newOffset * VERTEX_SIZE, itemSize * VERTEX_SIZE );
// Update new offset
item->setOffset( newOffset );
// Move to the next free space
newOffset += itemSize;
}
// Move the current item and place it at the end
if( m_item->GetSize() > 0 )
{
glCopyBufferSubData( GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
m_item->GetOffset() * VERTEX_SIZE, newOffset * VERTEX_SIZE,
m_item->GetSize() * VERTEX_SIZE );
m_item->setOffset( newOffset );
m_chunkOffset = newOffset;
}
// Cleanup
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
// Previously we have unmapped the array buffer, now when it is also
// unbound, it may be officially marked as unmapped
m_isMapped = false;
glDeleteBuffers( 1, &m_glBufferHandle );
// Switch to the new vertex buffer
m_glBufferHandle = newBuffer;
Map();
checkGlError( "switching buffers during defragmentation" );
#ifdef __WXDEBUG__
totalTime.Stop();
wxLogTrace( "GAL_CACHED_CONTAINER_GPU",
"Defragmented container storing %d vertices / %.1f ms",
m_currentSize - m_freeSpace, totalTime.msecs() );
#endif /* __WXDEBUG__ */
m_freeSpace += ( aNewSize - m_currentSize );
m_currentSize = aNewSize;
// Now there is only one big chunk of free memory
m_freeChunks.clear();
m_freeChunks.insert( std::make_pair( m_freeSpace, m_currentSize - m_freeSpace ) );
return true;
}
bool CACHED_CONTAINER_GPU::defragmentResizeMemcpy( unsigned int aNewSize )
{
wxCHECK( IsMapped(), false );
wxLogTrace( "GAL_CACHED_CONTAINER_GPU",
wxT( "Resizing & defragmenting container (memcpy) from %d to %d" ),
m_currentSize, aNewSize );
// No shrinking if we cannot fit all the data
if( usedSpace() > aNewSize )
return false;
#ifdef __WXDEBUG__
PROF_COUNTER totalTime;
#endif /* __WXDEBUG__ */
GLuint newBuffer;
VERTEX* newBufferMem;
// Create the destination buffer
glGenBuffers( 1, &newBuffer );
// It would be best to use GL_COPY_WRITE_BUFFER here,
// but it is not available everywhere
#ifdef __WXDEBUG__
GLint eaBuffer = -1;
glGetIntegerv( GL_ELEMENT_ARRAY_BUFFER_BINDING, &eaBuffer );
wxASSERT( eaBuffer == 0 );
#endif /* __WXDEBUG__ */
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, newBuffer );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, aNewSize * VERTEX_SIZE, NULL, GL_DYNAMIC_DRAW );
newBufferMem = static_cast<VERTEX*>( glMapBuffer( GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY ) );
checkGlError( "creating buffer during defragmentation" );
defragment( newBufferMem );
// Cleanup
glUnmapBuffer( GL_ELEMENT_ARRAY_BUFFER );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
Unmap();
glDeleteBuffers( 1, &m_glBufferHandle );
// Switch to the new vertex buffer
m_glBufferHandle = newBuffer;
Map();
checkGlError( "switching buffers during defragmentation" );
#ifdef __WXDEBUG__
totalTime.Stop();
wxLogTrace( "GAL_CACHED_CONTAINER_GPU",
"Defragmented container storing %d vertices / %.1f ms",
m_currentSize - m_freeSpace, totalTime.msecs() );
#endif /* __WXDEBUG__ */
m_freeSpace += ( aNewSize - m_currentSize );
m_currentSize = aNewSize;
// Now there is only one big chunk of free memory
m_freeChunks.clear();
m_freeChunks.insert( std::make_pair( m_freeSpace, m_currentSize - m_freeSpace ) );
return true;
}