SDL_GL_Demo

SDL Library Setup
http://ideasincloud.wordpress.com/2013/05/05/set-up-sdl-in-visual-studio-2012-on-windows-8/

  /* *Author from JP.Lee *This is first OpenGL Shader preview framwork via SDL api. *5/19/2013 first update. */ #include "SDL.h" #ifdef WIN32 #define WIN32_LEAN_AND_MEAN #include <windows.h> #endif //Platform Defined #if defined(__APPLE__) && defined(__MACH__) #include <OpenGL/gl.h> #include <OpenGL/glu.h> #else #include <GL/GL.h> #include <GL/GLU.h> #endif const GLsizei windowWidth = 1280; const GLsizei windowHeight = 720; GLfloat viewFOVY = 45.0f; GLfloat cubePositionZ = -5.0f; GLfloat cubeRotateX = 45.0f; GLfloat cubeRotateY = 45.0f; Uint8 *keys = NULL; GLvoid establisheProjectionMatrix(GLsizei width, GLsizei height) { glViewport(0,0,width,height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); //first setting up make perspective view. //*************FOV gluPerspective((GLfloat)viewFOVY , (GLfloat)width / (GLfloat)height, 0.1f , 200.0f); } GLvoid initGL(GLsizei width , GLsizei height) { establisheProjectionMatrix(width , height); glShadeModel(GL_SMOOTH); glClearColor(0.0f , 0.0f , 0.0f, 1.0f); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT , GL_NICEST); glEnable(GL_PERSPECTIVE_CORRECTION_HINT); } GLvoid displayFPS(GLvoid) { static long lastTime = SDL_GetTicks(); static long loops = 0; static GLfloat fps = 0.0f; int newTime = SDL_GetTicks(); if (newTime - lastTime > 100) { float newFPS = (float)loops / float(newTime-lastTime)* 1000.0f; fps = (fps+ newFPS) / 2.0f; char title[80]; sprintf_s(title, "JP OpenGL VIEWER - %f" , fps); SDL_WM_SetCaption(title , NULL); lastTime = newTime; loops = 0; } loops++; } GLvoid drawScene(GLvoid) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); //glTranslatef(0 , 0 , -5.0f); //offset to -z 5.0 glTranslatef(0,0,cubePositionZ); glRotatef(cubeRotateX , 1 , 0 , 0); //45 degree rotation X glRotatef(cubeRotateY , 0 , 1 , 0); //45 degree rotation +Y //??? ????? glBegin(GL_QUADS); //top face glColor3f(1.0f , 0.5f , 0.0f); glVertex3f( 1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f , 1.0f , 1.0f); glVertex3f( 1.0f , 1.0f , 1.0f); //bottom face glColor3f(0.0f , 1.0f , 0.0f); glVertex3f( 1.0f ,-1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f , 1.0f); glVertex3f( 1.0f ,-1.0f , 1.0f); //front face glColor3f(1.0f , 0.0f , 0.0f); glVertex3f( 1.0f , 1.0f , 1.0f); glVertex3f(-1.0f , 1.0f , 1.0f); glVertex3f(-1.0f ,-1.0f , 1.0f); glVertex3f( 1.0f ,-1.0f , 1.0f); //back face glColor3f(1.0f , 1.0f , 0.0f);//yellow glVertex3f( 1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f ,-1.0f); glVertex3f( 1.0f ,-1.0f ,-1.0f); //left face glColor3f(0.0f , 0.0f , 1.0f);//red glVertex3f(-1.0f , 1.0f , 1.0f); glVertex3f(-1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f , 1.0f); //right face glColor3f(1.0f , 0.0f , 1.0f); glVertex3f( 1.0f , 1.0f , 1.0f); glVertex3f( 1.0f , 1.0f ,-1.0f); glVertex3f( 1.0f ,-1.0f ,-1.0f); glVertex3f( 1.0f ,-1.0f , 1.0f); glEnd(); glFlush(); SDL_GL_SwapBuffers(); displayFPS(); } GLboolean checkKeys(GLvoid) { const GLfloat speed = 1.0f; const GLfloat zoom = 1.0f; const GLfloat sensitive = 5.0f; if ( keys[ SDLK_ESCAPE ]) return true; if ( keys[SDLK_LEFT]) cubeRotateY -= speed; if(keys[SDLK_RIGHT]) cubeRotateY += speed; if(keys[SDLK_UP]) cubeRotateX -= speed; if(keys[SDLK_DOWN]) cubeRotateX += speed; if(keys[SDLK_HOME]) cubePositionZ -= zoom/sensitive; if(keys[SDLK_END]) cubePositionZ += zoom/sensitive; return false; } int main (int argc , char *argv[]) { if ( SDL_Init(SDL_INIT_VIDEO) < 0) { } if (SDL_SetVideoMode( windowWidth , windowHeight , 0 , SDL_OPENGL) == NULL) { } initGL(windowWidth , windowHeight); int done = 0; while ( !done ) { drawScene(); SDL_Event event; while (SDL_PollEvent(&event)) { if ( event.type == SDL_QUIT ) { done = 1; } keys = SDL_GetKeyState(NULL); } if ( checkKeys()) done = 1; } SDL_Quit(); return 0; }} Game Developer Leegoon copyright all right reserved since 2010.