1 files changed, 272 insertions, 0 deletions
diff --git a/common/gal/opengl/shader.cpp b/common/gal/opengl/shader.cpp
new file mode 100644
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+++ b/common/gal/opengl/shader.cpp
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+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
+ * Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
+ *
+ * Graphics Abstraction Layer (GAL) for OpenGL
+ *
+ * Shader class
+ *
+ * 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 <iostream>
+#include <fstream>
+#include <stdexcept>
+
+#include <cstring>
+#include <cassert>
+
+#include <gal/opengl/shader.h>
+#include "shader_src.h"
+
+using namespace KIGFX;
+
+SHADER::SHADER() :
+    isProgramCreated( false ),
+    isShaderLinked( false ),
+    active( false ),
+    maximumVertices( 4 ),
+    geomInputType( GL_LINES ),
+    geomOutputType( GL_LINES )
+
+{
+    // Do not have uninitialized members:
+    programNumber = 0;
+}
+
+
+SHADER::~SHADER()
+{
+    if( isProgramCreated )
+    {
+        // Delete the shaders and the program
+        for( std::deque<GLuint>::iterator it = shaderNumbers.begin(); it != shaderNumbers.end();
+             ++it )
+        {
+            glDeleteShader( *it );
+        }
+
+        glDeleteProgram( programNumber );
+    }
+}
+
+
+bool SHADER::LoadBuiltinShader( unsigned int aShaderNumber, SHADER_TYPE aShaderType )
+{
+    if( aShaderNumber >= shaders_number )
+        return false;
+
+    return addSource( std::string( shaders_src[aShaderNumber] ), aShaderType );
+}
+
+
+bool SHADER::LoadShaderFromFile( const std::string& aShaderSourceName, SHADER_TYPE aShaderType )
+{
+    // Load shader sources
+    const std::string shaderSource = readSource( aShaderSourceName );
+
+    return addSource( shaderSource, aShaderType );
+}
+
+
+void SHADER::ConfigureGeometryShader( GLuint maxVertices, GLuint geometryInputType,
+                                      GLuint geometryOutputType )
+{
+    maximumVertices = maxVertices;
+    geomInputType   = geometryInputType;
+    geomOutputType  = geometryOutputType;
+}
+
+
+bool SHADER::Link()
+{
+    // Shader linking
+    glLinkProgram( programNumber );
+    programInfo( programNumber );
+
+    // Check the Link state
+    glGetObjectParameterivARB( programNumber, GL_OBJECT_LINK_STATUS_ARB,
+                               (GLint*) &isShaderLinked );
+
+#ifdef DEBUG
+    if( !isShaderLinked )
+    {
+        int maxLength;
+        glGetProgramiv( programNumber, GL_INFO_LOG_LENGTH, &maxLength );
+        maxLength = maxLength + 1;
+        char* linkInfoLog = new char[maxLength];
+        glGetProgramInfoLog( programNumber, maxLength, &maxLength, linkInfoLog );
+        std::cerr << "Shader linking error:" << std::endl;
+        std::cerr << linkInfoLog;
+        delete[] linkInfoLog;
+    }
+#endif /* DEBUG */
+
+    return isShaderLinked;
+}
+
+
+int SHADER::AddParameter( const std::string& aParameterName )
+{
+    GLint location = glGetUniformLocation( programNumber, aParameterName.c_str() );
+
+    if( location != -1 )
+        parameterLocation.push_back( location );
+
+    return location;
+}
+
+
+void SHADER::SetParameter( int parameterNumber, float value ) const
+{
+    glUniform1f( parameterLocation[parameterNumber], value );
+}
+
+
+void SHADER::SetParameter( int parameterNumber, int value ) const
+{
+    glUniform1i( parameterLocation[parameterNumber], value );
+}
+
+
+int SHADER::GetAttribute( std::string aAttributeName ) const
+{
+    return glGetAttribLocation( programNumber, aAttributeName.c_str() );
+}
+
+
+void SHADER::programInfo( GLuint aProgram )
+{
+    GLint glInfoLogLength = 0;
+    GLint writtenChars    = 0;
+
+    // Get the length of the info string
+    glGetProgramiv( aProgram, GL_INFO_LOG_LENGTH, &glInfoLogLength );
+
+    // Print the information
+    if( glInfoLogLength > 2 )
+    {
+        GLchar* glInfoLog = new GLchar[glInfoLogLength];
+        glGetProgramInfoLog( aProgram, glInfoLogLength, &writtenChars, glInfoLog );
+
+        std::cerr << glInfoLog << std::endl;
+
+        delete[] glInfoLog;
+    }
+}
+
+
+void SHADER::shaderInfo( GLuint aShader )
+{
+    GLint glInfoLogLength = 0;
+    GLint writtenChars    = 0;
+
+    // Get the length of the info string
+    glGetShaderiv( aShader, GL_INFO_LOG_LENGTH, &glInfoLogLength );
+
+    // Print the information
+    if( glInfoLogLength > 2 )
+    {
+        GLchar* glInfoLog = new GLchar[glInfoLogLength];
+        glGetShaderInfoLog( aShader, glInfoLogLength, &writtenChars, glInfoLog );
+
+        std::cerr << glInfoLog << std::endl;
+
+        delete[] glInfoLog;
+    }
+}
+
+
+std::string SHADER::readSource( std::string aShaderSourceName )
+{
+    // Open the shader source for reading
+    std::ifstream inputFile( aShaderSourceName.c_str(), std::ifstream::in );
+    std::string   shaderSource;
+
+    if( !inputFile )
+        throw std::runtime_error( "Can't read the shader source: " + aShaderSourceName );
+
+    std::string shaderSourceLine;
+
+    // Read all lines from the text file
+    while( getline( inputFile, shaderSourceLine ) )
+    {
+        shaderSource += shaderSourceLine;
+        shaderSource += "\n";
+    }
+
+    return shaderSource;
+}
+
+
+bool SHADER::addSource( const std::string& aShaderSource, SHADER_TYPE aShaderType )
+{
+    assert( !isShaderLinked );
+
+    // Create the program
+    if( !isProgramCreated )
+    {
+        programNumber    = glCreateProgram();
+        isProgramCreated = true;
+    }
+
+    // Create a shader
+    GLuint shaderNumber = glCreateShader( aShaderType );
+    shaderNumbers.push_back( shaderNumber );
+
+    // Get the program info
+    programInfo( programNumber );
+
+    // Copy to char array
+    char* source = new char[aShaderSource.size() + 1];
+    strncpy( source, aShaderSource.c_str(), aShaderSource.size() + 1 );
+    const char** source_ = (const char**) ( &source );
+
+    // Attach the source
+    glShaderSource( shaderNumber, 1, source_, NULL );
+    programInfo( programNumber );
+
+    // Delete the allocated char array
+    delete[] source;
+
+    // Compile and attach shader to the program
+    glCompileShader( shaderNumber );
+    GLint status;
+    glGetShaderiv( shaderNumber, GL_COMPILE_STATUS, &status );
+
+    if( status != GL_TRUE )
+    {
+        shaderInfo( shaderNumber );
+        throw std::runtime_error( "Shader compilation error" );
+    }
+
+    glAttachShader( programNumber, shaderNumber );
+    programInfo( programNumber );
+
+    // Special handling for the geometry shader
+    if( aShaderType == SHADER_TYPE_GEOMETRY )
+    {
+        glProgramParameteriEXT( programNumber, GL_GEOMETRY_VERTICES_OUT_EXT, maximumVertices );
+        glProgramParameteriEXT( programNumber, GL_GEOMETRY_INPUT_TYPE_EXT, geomInputType );
+        glProgramParameteriEXT( programNumber, GL_GEOMETRY_OUTPUT_TYPE_EXT, geomOutputType );
+    }
+
+    return true;
+}