Graphics/3D/nehe/lesson06/source/nehe6.cpp

/****************************************
 *              NDS NeHe Lesson 06                      *
 *              Author: Dovoto                                  *
 ****************************************/

// include your ndslib
#include <nds.h>
#include <malloc.h>
//needed to load pcx files
#include <nds/arm9/image.h>


#include "drunkenlogo_pcx.h"

int DrawGLScene();

float   xrot;                           // X Rotation ( NEW )
float   yrot;                           // Y Rotation ( NEW )
float   zrot;                           // Z Rotation ( NEW )

int     texture[1];                     // Storage For One Texture ( NEW )

int LoadGLTextures()                                                                    // Load PCX files And Convert To Textures
{
        sImage pcx;                

        //load our texture
        loadPCX((u8*)drunkenlogo_pcx, &pcx);
        
        image8to16(&pcx);

        glGenTextures(1, &texture[0]);
        glBindTexture(0, texture[0]);
        glTexImage2D(0, 0, GL_RGB, TEXTURE_SIZE_128 , TEXTURE_SIZE_128, 0, TEXGEN_TEXCOORD, pcx.image.data8);

        imageDestroy(&pcx);

        return TRUE;
}

int main() {    
        
        // Setup the Main screen for 3D 
        videoSetMode(MODE_0_3D);
        vramSetBankA(VRAM_A_TEXTURE);                        //NEW  must set up some memory for textures
        
        // initialize the geometry engine
        glInit();
        
        // enable textures
        glEnable(GL_TEXTURE_2D);
        
        // 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);
        
        LoadGLTextures();
        
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(70, 256.0 / 192.0, 0.1, 100);
        
        // Set the current matrix to be the model matrix
        glMatrixMode(GL_MODELVIEW);
        
        //need to set up some material properties since DS does not have them set by default
        glMaterialf(GL_AMBIENT, RGB15(16,16,16));
        glMaterialf(GL_DIFFUSE, RGB15(16,16,16));
        glMaterialf(GL_SPECULAR, BIT(15) | RGB15(8,8,8));
        glMaterialf(GL_EMISSION, RGB15(16,16,16));
        
        //ds uses a table for shinyness..this generates a half-ass one
        glMaterialShinyness();
        
        //ds specific, several attributes can be set here       
        glPolyFmt(POLY_ALPHA(31) | POLY_CULL_NONE  | POLY_FORMAT_LIGHT0| POLY_FORMAT_LIGHT1| POLY_FORMAT_LIGHT2);
        
        glLight(0, RGB15(31,31,31) , 0,                           floattov10(-1.0),              0);
        glLight(1, RGB15(31,31,31) , 0,                           0,    floattov10(-1.0));
        glLight(2, RGB15(31,31,31) , 0,                           0,    floattov10(1.0));
        
        while (1) 
        {
                // set the color of the vertices to be drawn
                glColor3f(1,1,1);
                
                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
{
        glLoadIdentity();                                                                       // Reset The View
        glTranslatef(0.0f,0.0f,-5.0f);

        glRotatef(xrot,1.0f,0.0f,0.0f);
        glRotatef(yrot,0.0f,1.0f,0.0f);
        glRotatef(zrot,0.0f,0.0f,1.0f);

        glBindTexture(GL_TEXTURE_2D, texture[0]);

        glBegin(GL_QUADS);
                // Front Face
                glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
                glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
                glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
                glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
                // Back Face
                glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
                glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
                glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
                glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
                // Top Face
                glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
                glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
                glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
                glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
                // Bottom Face
                glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
                glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
                glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
                glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
                // Right face
                glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
                glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
                glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
                glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
                // Left Face
                glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
                glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
                glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
                glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
        glEnd();

        xrot+=0.3f;
        yrot+=0.2f;
        zrot+=0.4f;
        return TRUE;                    
}