Graphics/3D/nehe/lesson02/source/nehe2.cpp

/****************************************
 *              NDS NeHe Lesson 02                      *
 *              Author: Dovoto                                  *
 ****************************************/

// include your ndslib
#include <nds.h>


int DrawGLScene();


int main() {            
        // Setup the Main screen for 3D 
        videoSetMode(MODE_0_3D);

        // initialize the geometry engine
        glInit();
        
        // enable antialiasing
        glEnable(GL_ANTIALIAS);
        
        // setup the rear plane
        glClearColor(0,0,0,31); // BG must be opaque for AA to work
        glClearPolyID(63); // BG must have a unique polygon ID for AA to work
        glClearDepth(0x7FFF);
        
        // Set our viewport to be the same size as the screen
        glViewport(0,0,255,191);
        
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(70, 256.0 / 192.0, 0.1, 100);
        
        // Set the color of the vertices
        glColor3f(1, 1, 1);
        
        while (1) {

                //ds specific, several attributes can be set here       
                glPolyFmt(POLY_ALPHA(31) | POLY_CULL_NONE);
                
                // Set the current matrix to be the model matrix
                glMatrixMode(GL_MODELVIEW);
                
                //Push our original Matrix onto the stack (save state)
                glPushMatrix(); 

                DrawGLScene();
                
                // Pop our Matrix from the stack (restore state)
                glPopMatrix(1);

                //a handy little built in function to wait for a screen refresh
                swiWaitForVBlank();
                
                // flush to screen      
                glFlush(0);
        
        }
        
        return 0;
}

int DrawGLScene() {
        
        glLoadIdentity();                                                                       // Reset The Current Modelview Matrix
        glTranslatef(-1.5f,0.0f,-6.0f);                                         // Move Left 1.5 Units And Into The Screen 6.0
        glBegin(GL_TRIANGLES);                                                          // Drawing Using Triangles
                glVertex3f( 0.0f, 1.0f, 0.0f);                                  // Top
                glVertex3f(-1.0f,-1.0f, 0.0f);                                  // Bottom Left
                glVertex3f( 1.0f,-1.0f, 0.0f);                                  // Bottom Right
        glEnd();                                                                                        // Finished Drawing The Triangle
        glTranslatef(3.0f,0.0f,0.0f);                                           // Move Right 3 Units
        glBegin(GL_QUADS);                                                                      // Draw A Quad
                glVertex3f(-1.0f, 1.0f, 0.0f);                                  // Top Left
                glVertex3f( 1.0f, 1.0f, 0.0f);                                  // Top Right
                glVertex3f( 1.0f,-1.0f, 0.0f);                                  // Bottom Right
                glVertex3f(-1.0f,-1.0f, 0.0f);                                  // Bottom Left
        glEnd();                                                                                        // Done Drawing The Quad
        return TRUE;                                                                            // Keep Going
}