//Stuff to do with sprites

#include <libps.h>

#define CalcSprPos2(sprite,cx,cy) \
	sprite->tpage = GetTPage(1,0,(((cx)>>1) & 8128),(cy) & 7936); \
	sprite->u = ((cx) % 128); \
	sprite->v = ((cy) % 256)

void InitSpr(long address);
void InitGsSprite (GsSPRITE* sprite);
void CalcLetterPos(GsSPRITE* spr, char letter);

// initialise sprite to dummy
void InitGsSprite (GsSPRITE* sprite) {
	sprite->attribute = 1<<24;
	sprite->x = 0;
	sprite->y = 0;
	sprite->w = 16;
	sprite->h = 16;
	sprite->tpage = 0;
	sprite->u = 0;
	sprite->v = 0;
	sprite->cx = 320;
	sprite->cy = 511;
	sprite->r=sprite->g=sprite->b = 128;
	sprite->mx = 0;
	sprite->my = 0;
	sprite->scalex = ONE;
	sprite->scaley = ONE;
	sprite->rotate = 0;
}


void InitSpr(long address) {

	GsIMAGE temp;
	RECT rect;

	// +4 because we need to skip head of TIM file
	GsGetTimInfo( (u_long *)(address+4), &temp);

	rect.x = temp.px;
	rect.y = temp.py;
	rect.w = temp.pw;
	rect.h = temp.ph;

	LoadImage(&rect, temp.pixel);

	// if image needs a CLUT, load it up 
	// (pmode: 8 or 9 ==> texture is 4-bit or 8-bit)
	if ( (temp.pmode>>3)&0x01) {
		rect.x = temp.cx;
		rect.y = temp.cy;
		rect.w = temp.cw;
		rect.h = temp.ch;

		LoadImage( &rect, temp.clut);
	}

	// wait for loading to finish
	DrawSync(0);
}


void CalcLetterPos(GsSPRITE* spr, char letter) {

	if (letter>47 && letter<58) {
		CalcSprPos2(spr, 640+((letter-48)<<4), 184);
	}
	else if (letter>96 && letter<123) {
		CalcSprPos2(spr, (384<<1) + (((letter-97) % 13)<<4), 100 + (((letter-97)/13)<<4));
	}
	
}