Graphics/3D/nehe/lesson04/source/nehe4.cpp

/****************************************
 *              NDS NeHe Lesson 04                      *
 *              Author: Dovoto                                  *
 ****************************************/

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


int DrawGLScene();

float rtri;                             // Angle For The Triangle ( NEW )
float rquad;                            // Angle For The Quad ( NEW )

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);
        
        //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);
        
        while (1) 
        {
                // draw the scene
                DrawGLScene();
                
                // flush to screen      
                glFlush(0);
                
                // wait for the screen to refresh
                swiWaitForVBlank();
        }
        
        return 0;
}

int DrawGLScene()                                                                                       // Here's Where We Do All The Drawing
{
        /*ds does this automagicaly*///glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);      // Clear Screen And Depth Buffer
        glLoadIdentity();                                                                       // Reset The Current Modelview Matrix
        glTranslatef(-1.5f,0.0f,-6.0f);                                         // Move Left 1.5 Units And Into The Screen 6.0
        glRotatef(rtri,0.0f,1.0f,0.0f);                                         // Rotate The Triangle On The Y axis ( NEW )
        glColor3f(1, 1, 1);                                                                     // set the vertex color
        glBegin(GL_TRIANGLES);                                                          // Start Drawing A Triangle
                glColor3f(1.0f,0.0f,0.0f);                                              // Set Top Point Of Triangle To Red
                glVertex3f( 0.0f, 1.0f, 0.0f);                                  // First Point Of The Triangle
                glColor3f(0.0f,1.0f,0.0f);                                              // Set Left Point Of Triangle To Green
                glVertex3f(-1.0f,-1.0f, 0.0f);                                  // Second Point Of The Triangle
                glColor3f(0.0f,0.0f,1.0f);                                              // Set Right Point Of Triangle To Blue
                glVertex3f( 1.0f,-1.0f, 0.0f);                                  // Third Point Of The Triangle
        glEnd();                                                                                        // Done Drawing The Triangle
        glLoadIdentity();                                                                       // Reset The Current Modelview Matrix
        glTranslatef(1.5f,0.0f,-6.0f);                                          // Move Right 1.5 Units And Into The Screen 6.0
        glRotatef(rquad,1.0f,0.0f,0.0f);                                        // Rotate The Quad On The X axis ( NEW )
        glColor3f(0.5f,0.5f,1.0f);                                                      // Set The Color To Blue One Time Only
        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
        rtri+=0.9f;                                                                                     // Increase The Rotation Variable For The Triangle ( NEW )
        rquad-=0.75f;                                                                           // Decrease The Rotation Variable For The Quad ( NEW )
        return TRUE;                                                                            // Keep Going
}