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Add basic framebuffer support (probably not working right yet?)

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Possibly (probably) calculating wrong pixel values, addresses.
This commit is contained in:
Aaron Lindsay 2012-09-07 23:54:04 -04:00
parent 12e890bb8a
commit 38f87f12c5
2 changed files with 58 additions and 0 deletions
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27
include/framebuffer.h Normal file
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#ifndef FRAMEBUFFER_H
#define FRAMEBUFFER_H
// 1, 2, and 4 bit color are currently unsupported
//#define FB_COLOR_DEPTH_1 1
//#define FB_COLOR_DEPTH_2 2
//#define FB_COLOR_DEPTH_4 4
#define FB_COLOR_DEPTH_8 8
#define FB_COLOR_DEPTH_16 16
#define FB_COLOR_DEPTH_24 24
struct fbdev {
unsigned int pixelwidth, pixelheight;
unsigned int color_depth;
void *fbaddr; //start address of the frame buffer in memory
void *device_ptr; //passed into device
};
struct fb {
unsigned int width, height;
unsigned int color_depth;
struct fbdev *device;
};
int fb_write_pixel(struct fb *f, unsigned int x, unsigned int y, unsigned int r, unsigned int g, unsigned int b);
#endif /* FRAMEBUFFER_H */

31
kernel/framebuffer.c Normal file
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#include <framebuffer.h>
int fb_write_pixel_8bit(struct fb *f, unsigned int x, unsigned int y, unsigned int r, unsigned int g, unsigned int b) {
unsigned char pixel = (((r >> 6) << 4) & 0x30) | (((b >> 6) << 2) & 0xC) | ((g >> 6) & 0x3);
((char*) (f->device->fbaddr))[y*f->device->pixelwidth + x] = pixel;
return 0;
}
int fb_write_pixel_16bit(struct fb *f, unsigned int x, unsigned int y, unsigned int r, unsigned int g, unsigned int b) {
unsigned int pixel = (((r >> 3) << 10) & 0x7BF6) | (((b >> 3) << 5) & 0x3E0) | ((g >> 3) & 0x1F);
((char*)f->device->fbaddr)[(y*f->device->pixelwidth + x) << 1] = (char)pixel;
((char*)f->device->fbaddr)[((y*f->device->pixelwidth + x) << 1) + 1] = (char)(pixel >> 8);
return 0;
}
int fb_write_pixel_24bit(struct fb *f, unsigned int x, unsigned int y, unsigned int r, unsigned int g, unsigned int b) {
((char*)f->device->fbaddr)[(y*f->device->pixelwidth + x)*3] = (char)r;
((char*)f->device->fbaddr)[(y*f->device->pixelwidth + x)*3 + 1] = (char)b;
((char*)f->device->fbaddr)[(y*f->device->pixelwidth + x)*3 + 2] = (char)g;
return 0;
}
int fb_write_pixel(struct fb *f, unsigned int x, unsigned int y, unsigned int r, unsigned int g, unsigned int b) {
if (f->device->color_depth == FB_COLOR_DEPTH_8)
return fb_write_pixel_8bit(f, x, y, r, g, b);
else if (f->device->color_depth == FB_COLOR_DEPTH_16)
return fb_write_pixel_16bit(f, x, y, r, g, b);
else if (f->device->color_depth == FB_COLOR_DEPTH_24)
return fb_write_pixel_24bit(f, x, y, r, g, b);
return -1;
}