vertex_manager.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013-2016 CERN
 * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Maciej Suminski <[email protected]>
 *
 * 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/vertex_manager.h>
#include <gal/opengl/cached_container.h>
#include <gal/opengl/noncached_container.h>
#include <gal/opengl/gpu_manager.h>
#include <gal/opengl/vertex_item.h>
#include <confirm.h>

using namespace KIGFX;

VERTEX_MANAGER::VERTEX_MANAGER( bool aCached ) :
 m_noTransform( true ),
 m_transform( 1.0f ),
 m_reserved( nullptr ),
 m_reservedSpace( 0 )
{
 m_container.reset( VERTEX_CONTAINER::MakeContainer( aCached ) );
 m_gpu.reset( GPU_MANAGER::MakeManager( m_container.get() ) );

 // There is no shader used by default
 for( unsigned int i = 0; i < SHADER_STRIDE; ++i )
 m_shader[i] = 0.0f;
}


void VERTEX_MANAGER::Map()
{
 m_container->Map();
}


void VERTEX_MANAGER::Unmap()
{
 m_container->Unmap();
}


bool VERTEX_MANAGER::Reserve( unsigned int aSize )
{
 assert( m_reservedSpace == 0 && m_reserved == nullptr );

 // flag to avoid hanging by calling DisplayError too many times:
 static bool show_err = true;

 m_reserved = m_container->Allocate( aSize );

 if( m_reserved == nullptr )
 {
 if( show_err )
 {
  DisplayError( nullptr, wxT( "VERTEX_MANAGER::Reserve: Vertex allocation error" ) );
 show_err = false;
 }

 return false;
 }

 m_reservedSpace = aSize;

 return true;
}


bool VERTEX_MANAGER::Vertex( GLfloat aX, GLfloat aY, GLfloat aZ )
{
 // flag to avoid hanging by calling DisplayError too many times:
 static bool show_err = true;

 // Obtain the pointer to the vertex in the currently used container
 VERTEX* newVertex;

 if( m_reservedSpace > 0 )
 {
 newVertex = m_reserved++;
 --m_reservedSpace;

 if( m_reservedSpace == 0 )
 m_reserved = nullptr;
 }
 else
 {
 newVertex = m_container->Allocate( 1 );
 }

 if( newVertex == nullptr )
 {
 if( show_err )
 {
 DisplayError( nullptr, wxT( "VERTEX_MANAGER::Vertex: Vertex allocation error" ) );
 show_err = false;
 }

 return false;
 }

 putVertex( *newVertex, aX, aY, aZ );

 return true;
}


bool VERTEX_MANAGER::Vertices( const VERTEX aVertices[], unsigned int aSize )
{
 // flag to avoid hanging by calling DisplayError too many times:
 static bool show_err = true;

 // Obtain pointer to the vertex in currently used container
 VERTEX* newVertex = m_container->Allocate( aSize );

 if( newVertex == nullptr )
 {
 if( show_err )
 {
 DisplayError( nullptr, wxT( "VERTEX_MANAGER::Vertices: Vertex allocation error" ) );
 show_err = false;
 }

 return false;
 }

 // Put vertices in already allocated memory chunk
 for( unsigned int i = 0; i < aSize; ++i )
 {
 putVertex( newVertex[i], aVertices[i].x, aVertices[i].y, aVertices[i].z );
 }

 return true;
}


void VERTEX_MANAGER::SetItem( VERTEX_ITEM& aItem ) const
{
 m_container->SetItem( &aItem );
}


void VERTEX_MANAGER::FinishItem() const
{
 m_container->FinishItem();
}


void VERTEX_MANAGER::FreeItem( VERTEX_ITEM& aItem ) const
{
 m_container->Delete( &aItem );
}


void VERTEX_MANAGER::ChangeItemColor( const VERTEX_ITEM& aItem, const COLOR4D& aColor ) const
{
 unsigned int size = aItem.GetSize();
 unsigned int offset = aItem.GetOffset();

 VERTEX* vertex = m_container->GetVertices( offset );

 for( unsigned int i = 0; i < size; ++i )
 {
 vertex->r = aColor.r * 255.0;
 vertex->g = aColor.g * 255.0;
 vertex->b = aColor.b * 255.0;
 vertex->a = aColor.a * 255.0;
 vertex++;
 }

 m_container->SetDirty();
}


void VERTEX_MANAGER::ChangeItemDepth( const VERTEX_ITEM& aItem, GLfloat aDepth ) const
{
 unsigned int size = aItem.GetSize();
 unsigned int offset = aItem.GetOffset();

 VERTEX* vertex = m_container->GetVertices( offset );

 for( unsigned int i = 0; i < size; ++i )
 {
 vertex->z = aDepth;
 vertex++;
 }

 m_container->SetDirty();
}


VERTEX* VERTEX_MANAGER::GetVertices( const VERTEX_ITEM& aItem ) const
{
 if( aItem.GetSize() == 0 )
 return nullptr; // The item is not stored in the container

 return m_container->GetVertices( aItem.GetOffset() );
}


void VERTEX_MANAGER::SetShader( SHADER& aShader ) const
{
 m_gpu->SetShader( aShader );
}


void VERTEX_MANAGER::Clear() const
{
 m_container->Clear();
}


void VERTEX_MANAGER::BeginDrawing() const
{
 m_gpu->BeginDrawing();
}


void VERTEX_MANAGER::DrawItem( const VERTEX_ITEM& aItem ) const
{
 m_gpu->DrawIndices( &aItem );
}


void VERTEX_MANAGER::EndDrawing() const
{
 m_gpu->EndDrawing();
}


void VERTEX_MANAGER::putVertex( VERTEX& aTarget, GLfloat aX, GLfloat aY, GLfloat aZ ) const
{
 // Modify the vertex according to the currently used transformations
 if( m_noTransform )
 {
 // Simply copy coordinates, when the transform matrix is the identity matrix
 aTarget.x = aX;
 aTarget.y = aY;
 aTarget.z = aZ;
 }
 else
 {
 // Apply transformations
 glm::vec4 transVertex( aX, aY, aZ, 1.0f );
 transVertex = m_transform * transVertex;

 aTarget.x = transVertex.x;
 aTarget.y = transVertex.y;
 aTarget.z = transVertex.z;
 }

 // Apply currently used color
 aTarget.r = m_color[0];
 aTarget.g = m_color[1];
 aTarget.b = m_color[2];
 aTarget.a = m_color[3];

 // Apply currently used shader
 for( unsigned int j = 0; j < SHADER_STRIDE; ++j )
 {
 aTarget.shader[j] = m_shader[j];
 }
}

void VERTEX_MANAGER::EnableDepthTest( bool aEnabled )
{
 m_gpu->EnableDepthTest( aEnabled );
}