int main(int argc, char *argv[])
{
//Setup SDL video
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
cerr << "SDL Initialization failed!" << endl;
return -1;
}
//Setup SDL attributes and versions
SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 4);
SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3);
SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
//Attach renderer and context to window
SDL_Window *window = SDL_CreateWindow("Object Loader", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 840, 840, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
SDL_Renderer * renderer = SDL_CreateRenderer( window, -1, 0 );
SDL_GLContext glcontext = SDL_GL_CreateContext( window );
//Setup glew
glewExperimental = GL_TRUE;
GLenum err = glewInit();
if( GLEW_OK != err )
{
cerr<<"Glew Initializatoin failed!" << endl << glewGetErrorString(err) << endl;
return -1;
}
//Enable OpenGL options
glEnable(GL_TEXTURE_2D);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_DEPTH_TEST);
//Log OpenGL information
cout << "GLEW Version: " << glewGetString(GLEW_VERSION)<< endl;
cout << "OpenGL Version: " << glGetString( GL_VERSION ) << endl;
cout << "OpenGL Vendor: " << glGetString( GL_VENDOR ) << endl;
cout << "OpenGL Renderer: " << glGetString( GL_RENDERER ) << endl;
cout << "OpenGL Shading Language Version: " << glGetString( GL_SHADING_LANGUAGE_VERSION ) << endl;
//Create vertex and fragment shaders
Shader *shader = new Shader();
shader->SetFragmentShader("shaders/Fragment_Mapping.glsl");
shader->SetVertexShader("shaders/Vertex_Mapping.glsl");
shader->CompileData();
//Create scene and assign shader/model
Scene *scene = new Scene();
scene->SetShader(shader);
scene->Setup();
//Execute the game loop
bool isPlaying = true;
int lastTick = SDL_GetTicks();
while(isPlaying)
{
//Calculate delta time
unsigned int currentTick = SDL_GetTicks();
float deltaTime = (float) (currentTick - lastTick) / 1000.0f;
lastTick = currentTick;
//Clear the frame buffer to black
glClearColor(0.0f,0.0f,0.0f,0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//Update and draw the current scene to window
//Check whether update method returned false in which case end the game
isPlaying = scene->Update(deltaTime);
scene->Draw();
SDL_GL_SwapWindow(window);
//Limit the fps if its running too high
if(deltaTime < (1.0f/50.0f))
{
SDL_Delay((unsigned int) (((1.0f/50.0f) - deltaTime)*1000.0f) );
}
}
//Cleanup and quit SDL
SDL_GL_DeleteContext( glcontext );
SDL_DestroyWindow( window );
SDL_Quit();
return 0;
}
