tfv: minimal sprite implementation

gr-sim/gr-sim.c

@@ -595,3 +595,51 @@ int basic_vlin(int y1, int y2, int at) {
 
 	return 0;
 }
+
+
+short gr_addr_lookup[48]={
+	0x400,0x480,0x500,0x580,0x600,0x680,0x700,0x780,
+	0x428,0x4a8,0x528,0x5a8,0x628,0x6a8,0x728,0x7a8,
+	0x450,0x4d0,0x550,0x5d0,0x650,0x6d0,0x750,0x7d0,
+};
+
+int grsim_put_sprite(unsigned char *sprite_data, int xpos, int ypos) {
+
+	int i,j,xsize,ysize;
+	unsigned char *ptr;
+	short address;
+	ptr=sprite_data;
+	xsize=*ptr;
+	ptr++;
+	ysize=*ptr;
+	ptr++;
+
+	for(j=0;j<ysize;j++) {
+		address=gr_addr_lookup[(ypos+j)/2];
+		address+=xpos;
+		for(i=0;i<xsize;i++) {
+			if (*ptr) ram[address]=*ptr;
+			ptr++;
+			address++;
+		}
+	}
+
+	return 0;
+}
+
+int gr_copy(short source, short dest) {
+
+	short dest_addr,source_addr;
+	int i,j;
+
+	for(i=0;i<8;i++) {
+		source_addr=gr_addr_lookup[i]+0x400;
+		dest_addr=gr_addr_lookup[i];
+
+		for(j=0;j<120;j++) {
+			ram[dest_addr+j]=ram[source_addr+j];
+		}
+	}
+
+	return 0;
+}

gr-sim/gr-sim.h

@@ -11,4 +11,5 @@ int bload(char *filename, int address);
 int scrn(unsigned char xcoord, unsigned char ycoord);
 int grsim_unrle(unsigned char *rle_data, int address);
 int home(void);
-
+int grsim_put_sprite(unsigned char *sprite_data, int xpos, int ypos);
+int gr_copy(short source, short dest);

gr-sim/tfv.c

@@ -32,23 +32,45 @@ static unsigned char title_rle[]=
 
 	};
 
+static unsigned char test_sprite[]={
+	0x8,0x4,
+	0x55,0x50,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x55,0x55,0x55,0x00,0x00,0x00,0x00,0x00,
+	0xff,0x1f,0x4f,0x2f,0xff,0x22,0x20,0x00,
+	0x5f,0x5f,0x5f,0x5f,0xff,0xf2,0xf2,0xf2,
+};
+
 
 int main(int argc, char **argv) {
 
 	int ch;
+	int x,y;
 
 	grsim_init();
 
 	/* Title Screen */
-	grsim_unrle(title_rle,0x400);
+	grsim_unrle(title_rle,0x800);
+	gr_copy(0x800,0x400);
 
 	grsim_update();
 
+	x=20;	y=21;
+	color_equals(0);
+
 	while(1) {
 
 		ch=grsim_input();
 
 		if (ch=='q') break;
+		if (ch=='i') if (y>0) y-=2;
+		if (ch=='m') if (y<39) y+=2;
+		if (ch=='j') if (x>0) x--;
+		if (ch=='k') if (x<39) x++;
+
+		gr_copy(0x800,0x400);
+		grsim_put_sprite(test_sprite,x,y);
+
+		grsim_update();
 
 		usleep(100000);
 	}