Change window address -> text drawing breaks

[cero]

In the following code, if I comment the setWindowAddress call, text draws fine. This is because the drawing expects the window to always be at the bottom of the top of VRAM. I think it should be changed to a draw at a static value.

Code: Select all

#include <genesis.h>
#define APLAN_DEFAULT           0xE000

int main() {

	VDP_setWindowAddress(APLAN_DEFAULT);

	VDP_setTextPlan(PLAN_B);

	VDP_drawText("This goes to plane B.", 10, 13);

	while (1);

	return 0;
}

[cero]

I tried to work around this, keeping window the first one, by setting plane B to the same address as plane A. But apparently this isn't legal, it creates a black screen.

Is this a limitation of the Genesis, or of SGDK?

[cero]

OK, I found a bug.

In the setBPlaneAddress function, the bplan_adr variable is not updated, even though that's done in the setReg function. Will file this one to github.

[cero]

For my original issue: I found a working memory layout by putting plane A at 0x0000. Since I use a fullscreen window plane in this project, the garbage in plane A doesn't matter, and this way no memory is wasted, I even gain 128 more tiles.

[Stef]

OK, I found a bug.

In the setBPlaneAddress function, the bplan_adr variable is not updated, even though that's done in the setReg function. Will file this one to github.

Thanks for pointing this one ! Never noticed, will be fixed next version