Graphics/3D/Toon_Shading/source/main.cpp

#include <nds.h>


//NB: This would look better if the object had a bit of texturing too (eyes, nose etc)


#include "statue_bin.h"


static void get_pen_delta( int *dx, int *dy )
{
    static int prev_pen[2] = { 0x7FFFFFFF, 0x7FFFFFFF };

    u32 keys = keysHeld();

    touchPosition touchXY;

    if( keys & KEY_TOUCH )
    {
        
        touchRead(&touchXY);
        if( prev_pen[0] != 0x7FFFFFFF )
        {
            *dx = (prev_pen[0] - touchXY.rawx);
            *dy = (prev_pen[1] - touchXY.rawy);
        }

        prev_pen[0] = touchXY.rawx;
        prev_pen[1] = touchXY.rawy;
    }
    else
    {
        prev_pen[0] = prev_pen[1] = 0x7FFFFFFF;
        *dx = *dy = 0;
    }
}



int main() {

    int rotateX = 0;
    int rotateY = 0;

    //set mode 0, enable BG0 and set it to 3D
    videoSetMode(MODE_0_3D);

    // initialize gl
    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);

    //this should work the same as the normal gl call
    glViewport(0,0,255,191);

    //toon-table entry 0 is for completely unlit pixels, going up to entry 31 for completely lit
    //We block-fill it in two halves, we get cartoony 2-tone lighting
    glSetToonTableRange( 0, 15, RGB15(8,8,8) );
    glSetToonTableRange( 16, 31, RGB15(24,24,24) );
    
    //any floating point gl call is being converted to fixed prior to being implemented
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(70, 256.0 / 192.0, 0.1, 40);
    
    //NB: When toon-shading, the hw ignores lights 2 and 3
    //Also note that the hw uses the RED component of the lit vertex to index the toon-table
    glLight(0, RGB15(16,16,16) , 0,     floattov10(-1.0),       0);
    glLight(1, RGB15(16,16,16),   floattov10(-1.0), 0,      0);
    
    gluLookAt(  0.0, 0.0, -3.0,     //camera possition 
                0.0, 0.0, 0.0,      //look at
                0.0, 1.0, 0.0);     //up
    
    while(1)
    {

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
            glRotateXi(rotateX);
            glRotateYi(rotateY);


            glMaterialf(GL_AMBIENT, RGB15(8,8,8));
            glMaterialf(GL_DIFFUSE, RGB15(24,24,24));
            glMaterialf(GL_SPECULAR, RGB15(0,0,0));
            glMaterialf(GL_EMISSION, RGB15(0,0,0));

            glPolyFmt(POLY_ALPHA(31) | POLY_CULL_BACK | POLY_FORMAT_LIGHT0 | POLY_FORMAT_LIGHT1 | POLY_TOON_HIGHLIGHT);


            scanKeys();
            u32 keys = keysHeld();

            if( keys & KEY_UP ) rotateX += 1;
            if( keys & KEY_DOWN ) rotateX -= 1;
            if( keys & KEY_LEFT ) rotateY += 1;
            if( keys & KEY_RIGHT ) rotateY -= 1;

            int pen_delta[2];
            get_pen_delta( &pen_delta[0], &pen_delta[1] );
            rotateY -= pen_delta[0];
            rotateX -= pen_delta[1];


            glCallList((u32*)statue_bin);
            glPopMatrix(1);

        glFlush(0);

        swiWaitForVBlank();
    }

    return 0;
}//end main