#include <vhex/defs/types.h>
#include <vhex/display.h>
#include <vhex/display/stack.h>

//---
// kernel-level API
//---

/* dclear_draw() : real drawing algorithm */
void dclear_render(struct dshader_surface *surface, uint32_t color)
{
	uint32_t *vram;
	int size = (surface->y1 == 220) ? 792 : 1980;

	vram = surface->frag;
	for (int i = 0; i < size; ++i)
		vram[i] = color;
}

//---
// Dstack-level API
//---

/* dclear_dstack() : dstack rwrapper primitive */
void dclear_dstack(struct dshader_surface *surface, uint32_t *arg)
{
	dclear_render(surface, arg[0]);
}

//---
// User-level API
//---

/* dclear(): Fill the screen with a single color */
did_t dclear(int color)
{
	uint32_t copti;

	dstack_invalidate();

	if (color == C_NONE)
		return (-1);

	color = color & 0xffff;
	copti = (color << 16) | (color << 0);
	return dstack_add_action(
		&DSTACK_CALL(&dclear_dstack, copti),
		NULL,
		NULL
	);
}