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
}