// Write the dat file that contains the GifTag and data to draw
// Basic:
// QW 0 - GIFTAG:
//        NLOOP=3,
//        EOP=1,
//        PRE=1,
//        PRIM=tri,gouraud,notex,nofog,noalpha,noaa,N/A,ctxt1,unfixed
//        FLG=PACKED
//        NREG=2
//        REGS=0x51
// QW 1 - COLOR 1 (red)
// QW 2 - VERTEX 1 (2048-100,2048-50,1)
// QW 3 - COLOR 2 (green)
// QW 4 - VERTEX 2 (2048+100,2048-50,1)
// QW 5 - COLOR 3 (blue)
// QW 6 - VERTEX 3 (2048+100,2048+50,1)


#include <stdio.h>

#include "packet.h"

typedef union
{
	u_long128     ul128;
	u_long64      ul64[2];
	u_int         ui32[4];
	float         f32[4];
} qword_t;

int main(int argc, char **argv)
{
	FILE *output;
	int bytes=0;
	int prim=0;
	qword_t color;
	qword_t vertex;

	u_long128 packet_data[1024];

	gifpacket_t gifpacket;

	if (argc!=2)
	{
		fprintf(stderr, "Usage: gen_data output_file\n");
		return -1;
	}

	gifpacket_init(&gifpacket, packet_data);

	prim=GS_SET_PRIM(GS_PRIM_TRI, GOURAUD(1), TEXTURED(0), FOG(0), ABE(0), ALPHA(0), AA(0), CTXT(0), FIX(0));
	gifpacket_addgsdata(&gifpacket, GIF_SET_TAG(NLOOP(3), EOP(1), PRE(1), prim, GIF_PACKED, NREG(2)));
	gifpacket_addgsdata(&gifpacket, 0x51);

	color.ui32[0]=0xFF; color.ui32[1]=0x0; color.ui32[2]=0x0; color.ui32[3]=0x0;
	gifpacket_addgspacked(&gifpacket, color.ul128);
	
	vertex.ui32[0]=(2048-100)<<4; vertex.ui32[1]=(2048-50)<<4; vertex.ui32[2]=1; vertex.ui32[3]=1;
	gifpacket_addgspacked(&gifpacket, vertex.ul128);
	
	color.ui32[0]=0x0; color.ui32[1]=0xFF; color.ui32[2]=0x0; color.ui32[3]=0x0;
	gifpacket_addgspacked(&gifpacket, color.ul128);
	
	vertex.ui32[0]=(2048+100)<<4; vertex.ui32[1]=(2048-50)<<4; vertex.ui32[2]=1; vertex.ui32[3]=1;
	gifpacket_addgspacked(&gifpacket, vertex.ul128);
	
	color.ui32[0]=0x0; color.ui32[1]=0x0; color.ui32[2]=0xFF; color.ui32[3]=0x0;
	gifpacket_addgspacked(&gifpacket, color.ul128);
	
	vertex.ui32[0]=(2048+100)<<4; vertex.ui32[1]=(2048+50)<<4; vertex.ui32[2]=1; vertex.ui32[3]=1;
	gifpacket_addgspacked(&gifpacket, vertex.ul128);
	
	gifpacket_terminate(&gifpacket);

	output=fopen(argv[1], "wb");
	
	if (output==NULL)
	{
		fprintf(stderr, "Could not open file \"%s\"\n", argv[1]);
		return -1;
	}

	fwrite(packet_data, sizeof(packet_data)/sizeof(qword_t), sizeof(qword_t), output);

	bytes=ftell(output);
	fclose(output);

	printf("Written %d bytes to \"%s\"\n", bytes, argv[1]);

	return 0;
}