jonas

/****************************************
 * 		NDS NeHe Lesson 08    			*
 * 		Author: Ethos					*
 ****************************************/

// 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();


GLfloat	xrot;				// X Rotation
GLfloat	yrot;				// Y Rotation
GLfloat xspeed;				// X Rotation Speed
GLfloat yspeed;				// Y Rotation Speed
GLfloat	z=-5.0f;			// Depth Into The Screen

GLfloat LightAmbient[]=		{ 0.5f, 0.5f, 0.5f, 1.0f };
GLfloat LightDiffuse[]=		{ 1.0f, 1.0f, 1.0f, 1.0f };
GLfloat LightPosition[]=	{ 0.0f, 0.0f, 2.0f, 1.0f };

int	texture[3];			// Storage For 3 Textures (only going to use 1 on the DS for this demo)



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

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

	//DS supports no filtering of anykind so no need for more than one texture
	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()
{	
	// Turn on everything
	powerON(POWER_ALL);
	
	// Setup the Main screen for 3D 
	videoSetMode(MODE_0_3D);
	vramSetBankA(VRAM_A_TEXTURE);                        //NEW  must set up some memory for textures

	// IRQ basic setup
	irqInit();
	irqSet(IRQ_VBLANK, 0);

	// initialize the geometry engine
	glInit();
	
	// enable textures
	glEnable(GL_TEXTURE_2D);
	
	glEnable(GL_BLEND);
	
	// enable antialiasing
	glEnable(GL_ANTIALIAS);
	
	// setup the rear plane
	glClearColor(0,0,31,31); // 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(35, 256.0 / 192.0, 0.1, 100);
	
	//set up a directional ligth arguments are light number (0-3), light color, 
	//and an x,y,z vector that points in the direction of the light
	glLight(0, RGB15(31,31,31) , 0, floattov10(-1.0), 0);
	
	
	glColor3f(1,1,1);
	
	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();
	
	// Set the current matrix to be the model matrix
	glMatrixMode(GL_MODELVIEW);
	
	while (1) 
	{
		//these little button functions are pretty handy
		scanKeys();
		
		if (keysHeld() & KEY_R)
		{
			z-=0.02f;
		}
		if (keysHeld() & KEY_L)
		{
			z+=0.02f;
		}
		if (keysHeld() & KEY_LEFT)
		{
			xspeed-=0.01f;
		}
		if (keysHeld() & KEY_RIGHT)
		{
			xspeed+=0.01f;
		}
		if (keysHeld() & KEY_UP)
		{
			yspeed+=0.01f;
		}
		if (keysHeld() & KEY_DOWN)
		{
			yspeed-=0.01f;
		}

		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,z);

	glRotatef(xrot,1.0f,0.0f,0.0f);
	glRotatef(yrot,0.0f,1.0f,0.0f);
	
	glPolyFmt(POLY_ALPHA(15) | POLY_CULL_BACK  | POLY_FORMAT_LIGHT0);

	glBindTexture(GL_TEXTURE_2D, texture[0]);  //no filters to swtich between
	
	glBegin(GL_QUADS);
		// Front Face
		glNormal3f( 0.0f, 0.0f, 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);
		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
		// Back Face
		glNormal3f( 0.0f, 0.0f,-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);
		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
		// Top Face
		glNormal3f( 0.0f, 1.0f, 0.0f);
		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);
		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
	// Bottom Face
		glNormal3f( 0.0f,-1.0f, 0.0f);
		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);
		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
		// Right face
		glNormal3f( 1.0f, 0.0f, 0.0f);
		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);
		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);

	
	// Left Face
		glNormal3f(-1.0f, 0.0f, 0.0f);
		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);
		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
	glEnd();

	xrot+=xspeed;
	yrot+=yspeed;
	return TRUE;										// Keep Going

}