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#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gfx_font.h"
#include "log.h"
#include "multiboot.h"
#include "panic.h"
#include "gfx.h"
uint8_t *framebuffer = NULL;
uint16_t fb_width;
uint16_t fb_height;
/* this is BYTES per pixel */
uint8_t fb_bpp;
uint16_t fb_stride;
const uint8_t *gfx_bpp = &fb_bpp;
const uint16_t *gfx_width = &fb_width;
const uint16_t *gfx_height = &fb_height;
static int cursor_x, cursor_y;
uint32_t _gfx_fgcol, _gfx_bgcol;
void gfx_set_background(uint32_t col)
{
_gfx_bgcol = col;
}
uint32_t gfx_get_background(void)
{
return _gfx_bgcol;
}
void gfx_set_foreground(uint32_t col)
{
_gfx_fgcol = col;
}
uint32_t gfx_get_foreground(void)
{
return _gfx_fgcol;
}
void gfx_drawpixel(int x, int y)
{
((uint32_t*)framebuffer)[y * fb_width + x] = _gfx_fgcol;
}
/* implemented in assembly now */
/*
void gfx_clear(uint32_t col)
{
uint8_t *p = framebuffer;
uint8_t *stop = framebuffer + fb_width * fb_height * fb_bpp;
while(p < stop)
{
*(uint32_t*)p = col;
p += fb_bpp;
}
}
*/
void gfx_reset(void)
{
_gfx_fgcol = VGA_RGBPACK(0xff, 0xff, 0xff);
_gfx_bgcol = VGA_RGBPACK(0, 0, 0);
gfx_clear();
cursor_y = 0;
cursor_x = 0;
}
void gfx_drawchar(int x, int y, char c)
{
uint8_t *line_addr = framebuffer + (x * fb_bpp) + (y * fb_stride);
const uint32_t bg = _gfx_bgcol;
const uint32_t fg = _gfx_fgcol;
for(int i = 0; i < FONT_HEIGHT; ++i)
{
uint8_t mask_table[8] = {128, 64, 32, 16, 8, 4, 2, 1};
for(int j = 0; j < 8; ++j)
{
if(gfx_font[c][i] & mask_table[j])
((uint32_t*)line_addr)[j] = fg;
}
line_addr += fb_stride;
}
}
void gfx_putchar(char ch)
{
if(ch != '\n')
{
gfx_drawchar(cursor_x, cursor_y, ch);
cursor_x += FONT_WIDTH;
if(cursor_x >= fb_width)
{
cursor_x = 0;
cursor_y += FONT_HEIGHT;
if(cursor_y >= fb_height)
{
gfx_clear();
cursor_y = 0;
}
}
}
else
{
cursor_x = 0;
cursor_y += FONT_HEIGHT;
if(cursor_y >= fb_height)
{
gfx_clear();
cursor_y = 0;
}
}
}
void gfx_puts(const char* str)
{
while(*str)
{
gfx_putchar(*str++);
}
}
/* implemented in assembly */
#if 0
void gfx_hline(int x1, int x2, int y)
{
/* make sure x1 is to the left of x2 */
if(x2 < x1)
{
int temp = x1;
x1 = x2;
x2 = temp;
}
uint8_t *base = framebuffer + y * fb_stride;
uint8_t *dest = base + x1 * fb_bpp;
uint8_t *stop = base + x2 * fb_bpp;
const uint32_t col = _gfx_fgcol;
while(dest < stop)
{
*(uint32_t*)dest = col;
dest += fb_bpp;
}
}
void gfx_vline(int y1, int y2, int x)
{
/* make sure y1 is above y2 */
if(y2 < y1)
{
int temp = y1;
y1 = y2;
y2 = temp;
}
uint8_t *dest = framebuffer + y1 * fb_stride + x * fb_bpp;
uint8_t *stop = framebuffer + y2 * fb_stride + x * fb_bpp;
const uint32_t col = _gfx_fgcol;
while(dest < stop)
{
*(uint32_t*)dest = col;
dest += fb_stride;
}
}
#endif
#define SWAP(x, y, tmp) (tmp=x;x=y;y=tmp;)
void gfx_fillrect(int x, int y, int w, int h)
{
for(int i = 0; i < h; ++i)
{
gfx_hline(x, x + w, y + i);
}
}
bool gfx_init(struct vbe_info_t *vbe_mode_info)
{
framebuffer = (uint8_t*)vbe_mode_info->physbase;
fb_width = vbe_mode_info->Xres;
fb_height = vbe_mode_info->Yres;
fb_bpp = vbe_mode_info->bpp / 8;
fb_stride = fb_bpp * fb_width;
if(fb_bpp != 4)
{
printf("WARNING: BPP != 32, falling back to text mode...\n");
return false;
}
gfx_reset();
set_putchar(gfx_putchar);
set_puts(gfx_puts);
return true;
}
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