stage3/gfx.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

#include "gfx.h"

struct GfxInfo *gfx_info = (void *) (0x1000-10);

// byteswap
u32 make_color(color col)
{
	return ((u32) 0)
		& ((u32) col.r << 0)
		& ((u32) col.g << 8)
		& ((u32) col.b << 16)
		& ((u32) col.a << 24);
}

void gfx_set_pixel(u16 x, u16 y, u32 col)
{
	*((u32 *) (u64) (gfx_info->framebuffer + y * gfx_info->pitch + x * sizeof col)) = col;
}

void gfx_set_area(u16 x, u16 y, u16 w, u16 h, u32 col)
{
	void *cbeg = (void *) (u64) (gfx_info->framebuffer + y * gfx_info->pitch + x * sizeof col);
	void *cend = cbeg + h * gfx_info->pitch;

	for (; cbeg < cend; cbeg += gfx_info->pitch) {
		void *rbeg = cbeg;
		void *rend = rbeg + w * sizeof col;

		for (; rbeg < rend; rbeg += sizeof col)
			*((u32 *) rbeg) = col;
	}
}