Merge pull request #3 from saurabhb17/master

secondary files

1 files changed, 302 insertions, 0 deletions

diff --git a/common/gal/opengl/gpu_manager.cpp b/common/gal/opengl/gpu_manager.cpp
new file mode 100644
index 0000000..be34a56
--- /dev/null
+++ b/common/gal/opengl/gpu_manager.cpp
@@ -0,0 +1,302 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2013 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
+ */
+
+/**
+ * @file gpu_manager.cpp
+ * @brief Class to handle uploading vertices and indices to GPU in drawing purposes.
+ */
+
+#include <gal/opengl/gpu_manager.h>
+#include <gal/opengl/cached_container.h>
+#include <gal/opengl/noncached_container.h>
+#include <gal/opengl/shader.h>
+#include <typeinfo>
+#include <wx/msgdlg.h>
+#include <confirm.h>
+#ifdef PROFILE
+#include <profile.h>
+#include <wx/debug.h>
+#include <wx/log.h>
+#endif /* PROFILE */
+
+using namespace KIGFX;
+
+GPU_MANAGER* GPU_MANAGER::MakeManager( VERTEX_CONTAINER* aContainer )
+{
+    if( typeid( *aContainer ) == typeid( CACHED_CONTAINER ) )
+        return new GPU_CACHED_MANAGER( aContainer );
+    else if( typeid( *aContainer ) == typeid( NONCACHED_CONTAINER ) )
+        return new GPU_NONCACHED_MANAGER( aContainer );
+
+    wxASSERT_MSG( false, wxT( "Not handled container type" ) );
+    return NULL;
+}
+
+
+GPU_MANAGER::GPU_MANAGER( VERTEX_CONTAINER* aContainer ) :
+    m_isDrawing( false ), m_container( aContainer ), m_shader( NULL ), m_shaderAttrib( 0 )
+{
+}
+
+
+GPU_MANAGER::~GPU_MANAGER()
+{
+}
+
+
+void GPU_MANAGER::SetShader( SHADER& aShader )
+{
+    m_shader = &aShader;
+
+    m_shaderAttrib = m_shader->GetAttribute( "attrShaderParams" );
+
+    if( m_shaderAttrib == -1 )
+    {
+        DisplayError( NULL, wxT( "Could not get the shader attribute location" ) );
+    }
+}
+
+
+// Cached manager
+GPU_CACHED_MANAGER::GPU_CACHED_MANAGER( VERTEX_CONTAINER* aContainer ) :
+    GPU_MANAGER( aContainer ), m_buffersInitialized( false ), m_indicesPtr( NULL ),
+    m_verticesBuffer( 0 ), m_indicesBuffer( 0 ), m_indicesSize( 0 ), m_indicesCapacity( 0 )
+{
+    // Allocate the biggest possible buffer for indices
+    resizeIndices( aContainer->GetSize() );
+}
+
+
+GPU_CACHED_MANAGER::~GPU_CACHED_MANAGER()
+{
+    if( m_buffersInitialized )
+    {
+        glBindBuffer( GL_ARRAY_BUFFER, 0 );
+        glDeleteBuffers( 1, &m_verticesBuffer );
+        glDeleteBuffers( 1, &m_indicesBuffer );
+    }
+}
+
+
+void GPU_CACHED_MANAGER::Initialize()
+{
+    wxASSERT( !m_buffersInitialized );
+
+    if( !m_buffersInitialized )
+    {
+        glGenBuffers( 1, &m_verticesBuffer );
+        glGenBuffers( 1, &m_indicesBuffer );
+        m_buffersInitialized = true;
+    }
+}
+
+
+void GPU_CACHED_MANAGER::BeginDrawing()
+{
+    wxASSERT( !m_isDrawing );
+
+    if( m_container->IsDirty() )
+        uploadToGpu();
+
+    // Number of vertices to be drawn in the EndDrawing()
+    m_indicesSize = 0;
+    // Set the indices pointer to the beginning of the indices-to-draw buffer
+    m_indicesPtr = m_indices.get();
+
+    m_isDrawing = true;
+}
+
+
+void GPU_CACHED_MANAGER::DrawIndices( unsigned int aOffset, unsigned int aSize )
+{
+    wxASSERT( m_isDrawing );
+
+    // Copy indices of items that should be drawn to GPU memory
+    for( unsigned int i = aOffset; i < aOffset + aSize; *m_indicesPtr++ = i++ );
+
+    m_indicesSize += aSize;
+}
+
+
+void GPU_CACHED_MANAGER::DrawAll()
+{
+    wxASSERT( m_isDrawing );
+
+    m_indicesSize = m_container->GetSize();
+    for( unsigned int i = 0; i < m_indicesSize; *m_indicesPtr++ = i++ );
+}
+
+
+void GPU_CACHED_MANAGER::EndDrawing()
+{
+    wxASSERT( m_isDrawing );
+
+    // Prepare buffers
+    glEnableClientState( GL_VERTEX_ARRAY );
+    glEnableClientState( GL_COLOR_ARRAY );
+
+    // Bind vertices data buffers
+    glBindBuffer( GL_ARRAY_BUFFER, m_verticesBuffer );
+    glVertexPointer( CoordStride, GL_FLOAT, VertexSize, 0 );
+    glColorPointer( ColorStride, GL_UNSIGNED_BYTE, VertexSize, (GLvoid*) ColorOffset );
+
+    if( m_shader != NULL )    // Use shader if applicable
+    {
+        m_shader->Use();
+        glEnableVertexAttribArray( m_shaderAttrib );
+        glVertexAttribPointer( m_shaderAttrib, ShaderStride, GL_FLOAT, GL_FALSE,
+                               VertexSize, (GLvoid*) ShaderOffset );
+    }
+
+    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, m_indicesBuffer );
+    glBufferData( GL_ELEMENT_ARRAY_BUFFER, m_indicesSize * sizeof(int), (GLvoid*) m_indices.get(), GL_DYNAMIC_DRAW );
+
+    glDrawElements( GL_TRIANGLES, m_indicesSize, GL_UNSIGNED_INT, 0 );
+
+    glBindBuffer( GL_ARRAY_BUFFER, 0 );
+    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
+
+    // Deactivate vertex array
+    glDisableClientState( GL_COLOR_ARRAY );
+    glDisableClientState( GL_VERTEX_ARRAY );
+
+    if( m_shader != NULL )
+    {
+        glDisableVertexAttribArray( m_shaderAttrib );
+        m_shader->Deactivate();
+    }
+
+    m_isDrawing = false;
+}
+
+
+void GPU_CACHED_MANAGER::uploadToGpu()
+{
+#ifdef PROFILE
+    prof_counter totalTime;
+    prof_start( &totalTime );
+#endif /* PROFILE  */
+
+    if( !m_buffersInitialized )
+        Initialize();
+
+    int bufferSize    = m_container->GetSize();
+    GLfloat* vertices = (GLfloat*) m_container->GetAllVertices();
+
+    // Upload vertices coordinates and shader types to GPU memory
+    glBindBuffer( GL_ARRAY_BUFFER, m_verticesBuffer );
+    glBufferData( GL_ARRAY_BUFFER, bufferSize * VertexSize, vertices, GL_STATIC_DRAW );
+    glBindBuffer( GL_ARRAY_BUFFER, 0 );
+
+    // Allocate the biggest possible buffer for indices
+    resizeIndices( bufferSize );
+
+    if( glGetError() != GL_NO_ERROR )
+        DisplayError( NULL, wxT( "Error during data upload to the GPU memory" ) );
+
+#ifdef PROFILE
+    prof_end( &totalTime );
+
+    wxLogDebug( wxT( "Uploading %d vertices to GPU / %.1f ms" ), bufferSize, totalTime.msecs() );
+#endif /* PROFILE */
+}
+
+
+void GPU_CACHED_MANAGER::resizeIndices( unsigned int aNewSize )
+{
+    if( aNewSize > m_indicesCapacity )
+    {
+        m_indicesCapacity = aNewSize;
+        m_indices.reset( new GLuint[m_indicesCapacity] );
+    }
+}
+
+
+// Noncached manager
+GPU_NONCACHED_MANAGER::GPU_NONCACHED_MANAGER( VERTEX_CONTAINER* aContainer ) :
+    GPU_MANAGER( aContainer )
+{
+}
+
+
+void GPU_NONCACHED_MANAGER::Initialize()
+{
+    // Nothing has to be intialized
+}
+
+
+void GPU_NONCACHED_MANAGER::BeginDrawing()
+{
+    // Nothing has to be prepared
+}
+
+
+void GPU_NONCACHED_MANAGER::DrawIndices( unsigned int aOffset, unsigned int aSize )
+{
+    wxASSERT_MSG( false, wxT( "Not implemented yet" ) );
+}
+
+
+void GPU_NONCACHED_MANAGER::DrawAll()
+{
+    // This is the default use case, nothing has to be done
+    // The real rendering takes place in the EndDrawing() function
+}
+
+
+void GPU_NONCACHED_MANAGER::EndDrawing()
+{
+    VERTEX*  vertices       = m_container->GetAllVertices();
+    GLfloat* coordinates    = (GLfloat*) ( vertices );
+    GLubyte* colors         = (GLubyte*) ( vertices ) + ColorOffset;
+
+    // Prepare buffers
+    glEnableClientState( GL_VERTEX_ARRAY );
+    glEnableClientState( GL_COLOR_ARRAY );
+
+    glVertexPointer( CoordStride, GL_FLOAT, VertexSize, coordinates );
+    glColorPointer( ColorStride, GL_UNSIGNED_BYTE, VertexSize, colors );
+
+    if( m_shader != NULL )    // Use shader if applicable
+    {
+        GLfloat* shaders = (GLfloat*) ( vertices ) + ShaderOffset / sizeof(GLfloat);
+
+        m_shader->Use();
+        glEnableVertexAttribArray( m_shaderAttrib );
+        glVertexAttribPointer( m_shaderAttrib, ShaderStride, GL_FLOAT, GL_FALSE,
+                               VertexSize, shaders );
+    }
+
+    glDrawArrays( GL_TRIANGLES, 0, m_container->GetSize() );
+
+    // Deactivate vertex array
+    glDisableClientState( GL_COLOR_ARRAY );
+    glDisableClientState( GL_VERTEX_ARRAY );
+
+    if( m_shader != NULL )
+    {
+        glDisableVertexAttribArray( m_shaderAttrib );
+        m_shader->Deactivate();
+    }
+}