kicad/common/gal/opengl/cached_container_gpu.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright 2013-2017 CERN
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* Copyright (C) 2020-2021 KiCad Developers, see AUTHORS.txt for contributors.
*
* @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>
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#include <wx/log.h>
#include <list>
#ifdef KICAD_GAL_PROFILE
#include <profile.h>
#endif /* KICAD_GAL_PROFILE */
using namespace KIGFX;
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/**
* Flag to enable debug output of the GAL OpenGL GPU cached container.
*
* Use "KICAD_GAL_CACHED_CONTAINER_GPU" to enable GAL OpenGL GPU cached container tracing.
*
* @ingroup trace_env_vars
*/
static const wxChar* const traceGalCachedContainerGpu = wxT( "KICAD_GAL_CACHED_CONTAINER_GPU" );
CACHED_CONTAINER_GPU::CACHED_CONTAINER_GPU( unsigned int aSize ) :
CACHED_CONTAINER( aSize ),
m_isMapped( false ),
m_glBufferHandle( -1 )
{
m_useCopyBuffer = GLEW_ARB_copy_buffer;
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wxString vendor( glGetString( GL_VENDOR ) );
// workaround for intel GPU drivers: disable glCopyBuffer, causes crashes/freezes on
// certain driver versions
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if( vendor.Contains( "Intel " ) || vendor.Contains( "etnaviv" ) )
{
m_useCopyBuffer = false;
}
glGenBuffers( 1, &m_glBufferHandle );
glBindBuffer( GL_ARRAY_BUFFER, m_glBufferHandle );
glBufferData( GL_ARRAY_BUFFER, m_currentSize * VERTEX_SIZE, nullptr, GL_DYNAMIC_DRAW );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
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checkGlError( "allocating video memory for cached container", __FILE__, __LINE__ );
}
CACHED_CONTAINER_GPU::~CACHED_CONTAINER_GPU()
{
if( m_isMapped )
Unmap();
if( glDeleteBuffers )
glDeleteBuffers( 1, &m_glBufferHandle );
}
void CACHED_CONTAINER_GPU::Map()
{
wxCHECK( !IsMapped(), /*void*/ );
// OpenGL version might suddenly stop being available in Windows when an RDP session is started
if( !glBindBuffer )
throw std::runtime_error( "OpenGL no longer available!" );
glBindBuffer( GL_ARRAY_BUFFER, m_glBufferHandle );
m_vertices = static_cast<VERTEX*>( glMapBuffer( GL_ARRAY_BUFFER, GL_READ_WRITE ) );
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if( checkGlError( "mapping vertices buffer", __FILE__, __LINE__ ) == GL_NO_ERROR )
m_isMapped = true;
}
void CACHED_CONTAINER_GPU::Unmap()
{
wxCHECK( IsMapped(), /*void*/ );
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// This gets called from ~CACHED_CONTAINER_GPU. To avoid throwing an exception from
// the dtor, catch it here instead.
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try
{
glUnmapBuffer( GL_ARRAY_BUFFER );
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checkGlError( "unmapping vertices buffer", __FILE__, __LINE__ );
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glBindBuffer( GL_ARRAY_BUFFER, 0 );
m_vertices = nullptr;
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checkGlError( "unbinding vertices buffer", __FILE__, __LINE__ );
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}
catch( const std::runtime_error& err )
{
wxLogError( wxT( "OpenGL did not shut down properly.\n\n%s" ), err.what() );
}
m_isMapped = false;
}
bool CACHED_CONTAINER_GPU::defragmentResize( unsigned int aNewSize )
{
if( !m_useCopyBuffer )
return defragmentResizeMemcpy( aNewSize );
wxCHECK( IsMapped(), false );
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wxLogTrace( traceGalCachedContainerGpu,
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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 KICAD_GAL_PROFILE
PROF_COUNTER totalTime;
#endif /* KICAD_GAL_PROFILE */
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 KICAD_GAL_PROFILE
GLint eaBuffer = -1;
glGetIntegerv( GL_ELEMENT_ARRAY_BUFFER_BINDING, &eaBuffer );
wxASSERT( eaBuffer == 0 );
#endif /* KICAD_GAL_PROFILE */
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, newBuffer );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, aNewSize * VERTEX_SIZE, nullptr, GL_DYNAMIC_DRAW );
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checkGlError( "creating buffer during defragmentation", __FILE__, __LINE__ );
ITEMS::iterator it, it_end;
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int newOffset = 0;
// Defragmentation
for( it = m_items.begin(), it_end = m_items.end(); it != it_end; ++it )
{
VERTEX_ITEM* item = *it;
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int itemOffset = item->GetOffset();
int itemSize = item->GetSize();
// Move an item to the new container
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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,
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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();
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checkGlError( "switching buffers during defragmentation", __FILE__, __LINE__ );
#ifdef KICAD_GAL_PROFILE
totalTime.Stop();
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wxLogTrace( traceGalCachedContainerGpu, "Defragmented container storing %d vertices / %.1f ms",
m_currentSize - m_freeSpace, totalTime.msecs() );
#endif /* KICAD_GAL_PROFILE */
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 );
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wxLogTrace( traceGalCachedContainerGpu,
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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 KICAD_GAL_PROFILE
PROF_COUNTER totalTime;
#endif /* KICAD_GAL_PROFILE */
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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 KICAD_GAL_PROFILE
GLint eaBuffer = -1;
glGetIntegerv( GL_ELEMENT_ARRAY_BUFFER_BINDING, &eaBuffer );
wxASSERT( eaBuffer == 0 );
#endif /* KICAD_GAL_PROFILE */
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, newBuffer );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, aNewSize * VERTEX_SIZE, nullptr, GL_DYNAMIC_DRAW );
newBufferMem = static_cast<VERTEX*>( glMapBuffer( GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY ) );
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checkGlError( "creating buffer during defragmentation", __FILE__, __LINE__ );
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();
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checkGlError( "switching buffers during defragmentation", __FILE__, __LINE__ );
#ifdef KICAD_GAL_PROFILE
totalTime.Stop();
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wxLogTrace( traceGalCachedContainerGpu, "Defragmented container storing %d vertices / %.1f ms",
m_currentSize - m_freeSpace, totalTime.msecs() );
#endif /* KICAD_GAL_PROFILE */
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;
}