rendered paste body// 3D graphics engine framework// by Ty Guenley#include "SDL/SDL.h"#include "SDL/SDL_opengl.h"#include <stdio.h>#include <cmath>//May need to be changed to whatever the math library is called on your machineconst double PI = 3.1415926535;const double mouseSensitivity = .1;struct coord3 { double x; double y; double z;}coord3 camPosition;camPosition.x = 0;camPosition.y = 0;camPosition.z = 10;int mousex, mousey;double rotationAngle = 0, tiltAngle = 0;//Timing variablesdouble lastTime, elapsedTime = .01;int main(int argc, char *argv[]) { SDL_Surface *screen; float Rotate=0.0f; // A rotation value to be used to spin our polygon glClearColor(0,0,0,0); if ( SDL_Init(SDL_INIT_VIDEO) != 0 ) { printf("Unable to initialize SDL: %s\n", SDL_GetError()); return 1; } SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); // *new* screen = SDL_SetVideoMode( 800, 600, 16, SDL_OPENGL ); // *changed* if ( !screen ) { printf("Unable to set video mode: %s\n", SDL_GetError()); return 1; } // Setup our screen //glViewport(0,0,800,600); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f,800.0f/600.0f,1.0f,500.0f); glMatrixMode(GL_MODELVIEW); // Ensure correct display of polygons glEnable(GL_CULL_FACE); glEnable(GL_DEPTH_TEST); glDepthMask(GL_TRUE); SDL_WarpMouse(400, 300); lastTime = SDL_GetTicks(); int done = 0; // SDL_ShowCursor(SDL_DISABLE); // disable cursor // This loop will run until Esc is pressed while(done == 0) { SDL_Event event; while ( SDL_PollEvent(&event) ) { if ( event.type == SDL_QUIT ) { done = 1; } // key events if ( event.type == SDL_KEYDOWN ) { if ( event.key.keysym.sym == SDLK_ESCAPE ) { done = 1; } // quit on escape } } //Get mouse coordinates SDL_GetMouseState(mousex, mousey); //Adjust our camera view based on how the mouse moved rotationAngle += (mousex - 400) * mouseSensitivity * elapsedTime; tiltAngle -= (mousey - 400) * mouseSensitivity * elapsedTime; //Limit camera tilt if (tiltAngle > PI/2) tiltAngle = PI/2; if (tiltAngle < -PI/2) tiltAngle = -PI/2; SDL_WarpMouse(400,300); // set mouse to center of screen Uint8 *keystate = SDL_GetKeyState(NULL); if ( keystate[SDLK_s] ) { camPosition.x += cos(rotationAngle) * 4 * elapsedTime; camPosition.z += sin(rotationAngle) * 4 * elapsedTime; } if ( keystate[SDLK_w] ) { camPosition.x -= cos(rotationAngle) * 4 * elapsedTime; camPosition.z -= sin(rotationAngle) * 4 * elapsedTime; } glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear screen and z-buffer glLoadIdentity(); // Reset current matrix (Modelview) // set camera angle gluLookAt (camPosition.x, camPosition.y, camPosition.z, camPosition.x + cos(rotationAngle), camPosition.y + sin(tiltAngle), camPosition.z + sin(rotationAngle), 0, 1, 0); // Do our rotations glTranslatef(0.0f,0.0f,-5.0f); glRotatef(Rotate,0.0f,0.0f,1.0f); glRotatef(Rotate,1.0f,0.6f,0.0f); // Draw the top and bottom faces glBegin(GL_QUADS); glColor3f(1.0f,0.0f,0.0f); // 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); glColor3f(0.0f,0.0f,1.0f); // Blue 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(); // Draw the side faces glBegin(GL_TRIANGLE_STRIP); glColor3f(1.0f,1.0f,1.0f); // White glVertex3f(-1.0f, 1.0f, 1.0f); glVertex3f(-1.0f,-1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glColor3f(0.0f,1.0f,0.0f); // Green glVertex3f( 1.0f,-1.0f, 1.0f); glColor3f(1.0f,1.0f,0.0f); // Yellow glVertex3f( 1.0f, 1.0f,-1.0f); glColor3f(0.0f,1.0f,1.0f); // Aqua? glVertex3f( 1.0f,-1.0f,-1.0f); glColor3f(0.6f,0.6f,0.6f); // Gray glVertex3f(-1.0f, 1.0f,-1.0f); glColor3f(0.1f,0.1f,0.1f); // Dark Gray glVertex3f(-1.0f,-1.0f,-1.0f); glColor3f(0.0f,0.0f,1.0f); // Blue glVertex3f(-1.0f, 1.0f, 1.0f); glColor3f(1.0f,0.0f,1.0f); // Red glVertex3f(-1.0f,-1.0f, 1.0f); glEnd(); // Add to the rotation for next frame Rotate+=0.05f; // Show our cube SDL_GL_SwapBuffers(); //Calculate elapsed time since last frame completed elapsedTime = SDL_GetTicks() - lastTime; lastTime = SDL_GetTicks(); }}