Elysian Shadows

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//this is needed by KOS
#define _arch_dreamcast

#include <kos.h>

#include <stdlib.h>
#include <cmath>
#include <cstring>

#include <png/png.h>


extern uint8 romdisk[]; 
KOS_INIT_ROMDISK(romdisk);
 

int xpos = 1;
int ypos = 1;
int xvel = 2;
int yvel = 2;


	//Convert
	//z = 256 - z;
	//255 = transparent
void draw_tr_quad(int x, int y, int z, int w, int h, int a, int r, int g, int b) { 
	pvr_poly_cxt_t cxt; 
	pvr_poly_hdr_t hdr; 
	pvr_vertex_t vert; 
	pvr_poly_cxt_col(&cxt,PVR_LIST_TR_POLY); 
	pvr_poly_compile(&hdr,&cxt); 
	pvr_prim(&hdr,sizeof(hdr)); 
	vert.argb = PVR_PACK_COLOR(a,r,g,b);    
	vert.oargb = 0; 
	vert.flags = PVR_CMD_VERTEX; 
	vert.x = x;		// = x-(w/2); 
	vert.y = y;		// = y-(h/2); 
	vert.z = z; 
	pvr_prim(&vert,sizeof(vert)); 
	vert.x = x + w;	// = x+(w/2); 
	vert.y = y;		// = y-(h/2); 
	vert.z = z;
	pvr_prim(&vert,sizeof(vert)); 
	vert.x = x;		// = x-(w/2); 
	vert.y = y + h;	// = y+(h/2); 
	vert.z = z; 
	pvr_prim(&vert,sizeof(vert)); 
	vert.x = x + w;	// = x+(w/2); 
	vert.y = y + h;	// y+(h/2); 
	vert.z = z; 
	vert.flags = PVR_CMD_VERTEX_EOL; 
	pvr_prim(&vert,sizeof(vert)); 
}


void DrawPNG(int x, int y, int w, int h, int scalex, int scaley, pvr_ptr_t GFX, int z, int a) { 
    pvr_poly_cxt_t cxt; 
    pvr_poly_hdr_t hdr; 
    pvr_vertex_t vert; 
    pvr_poly_cxt_txr(&cxt,PVR_LIST_TR_POLY,PVR_TXRFMT_ARGB4444,w,h,GFX,PVR_FILTER_NONE); 
    pvr_poly_compile(&hdr,&cxt); 
    pvr_prim(&hdr,sizeof(hdr)); 
    vert.argb = PVR_PACK_COLOR(a,1,1,1);    
    vert.oargb = 0; 
    vert.flags = PVR_CMD_VERTEX; 
    vert.x = x - (w/2) - scalex; 
    vert.y = y - (h/2) - scaley;
    vert.z = z; 
    vert.u = 0.0; 
    vert.v = 0.0; 
    pvr_prim(&vert,sizeof(vert)); 
    vert.x = x + (w/2) + scalex; 
    vert.y = y - (h/2) - scaley; 
    vert.z = z; 
    vert.u = 1.0; 
    vert.v = 0.0; 
    pvr_prim(&vert,sizeof(vert)); 
    vert.x = x - (w/2) - scalex; 
    vert.y = y + (h/2) + scaley; 
    vert.z = z; 
    vert.u = 0.0; 
    vert.v = 1.0; 
    pvr_prim(&vert,sizeof(vert)); 
    vert.x = x + (w/2) + scalex; 
    vert.y = y + (h/2) + scaley; 
    vert.z = z; 
    vert.u = 1.0; 
    vert.v = 1.0; 
    vert.flags = PVR_CMD_VERTEX_EOL; 
    pvr_prim(&vert, sizeof(vert)); 
}



void UpdateRect()
{
	xpos = xpos + xvel;
	ypos = ypos + yvel;

	if(xpos < 0) { xpos = 0; xvel = -xvel; }
	if(ypos < 0) { ypos = 0; yvel = -yvel; }
	if(xpos > 640-100) { xpos = 640-100; xvel = -xvel; }
	if(ypos > 480-100) { ypos = 480-100; yvel = -yvel; }

	draw_tr_quad(xpos, ypos, 1, 100, 100, 1, 255, 255, 1);

}


void DrawFrame()
{
	//Debug only: Shows how much lag between seens (red=good)
//	vid_border_color(255, 0, 0);
	pvr_wait_ready();
//	vid_border_color(0, 255, 0); 
	vid_border_color(0, 0, 0);

    pvr_scene_begin(); 
	
	// Non-transparent graphics
    pvr_list_begin(PVR_LIST_OP_POLY); 
    pvr_list_finish(); 

	// Transparent graphics
    pvr_list_begin(PVR_LIST_TR_POLY);

		UpdateRect();

	pvr_list_finish();
	
    pvr_scene_finish(); 
}




int main()
{
    srand(time(NULL));
    vid_set_mode(DM_640x480, PM_RGB565); 
    pvr_init_defaults();

	//Resets DC-Load when L,R,A,B,X,Y and Start is pressed
//	cont_btn_callback(0, CONT_START | CONT_A | CONT_B | CONT_X | CONT_Y, (void (*)(unsigned char, long  unsigned int))arch_exit);
	cont_btn_callback(0, CONT_START | CONT_A | CONT_X , (void (*)(unsigned char, long  unsigned int))arch_exit);


//	pvr_ptr_t pic;
//	pic = pvr_mem_malloc(256*256*2);
//	png_to_texture("/rd/room.png", pic, PNG_FULL_ALPHA);

	pvr_ptr_t blue_logo = pvr_mem_malloc(256*256*2);
    png_to_texture("/rd/room.png", blue_logo, PNG_FULL_ALPHA);

	while(1)	
	{
		DrawFrame();
	}

	return 0;
}