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Putting pixels to screen

This commit is contained in:
Jarkko Toivanen 2023-06-18 07:47:52 +03:00
parent 5bfb8d9e97
commit fadccef0df
Signed by: jt
GPG Key ID: 9151B109B73ECAD5
3 changed files with 67 additions and 69 deletions
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23
src/framebuffer.c Normal file
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@ -0,0 +1,23 @@
#include "framebuffer.h"
static unsigned long fb_address;
static unsigned long fb_pitch;
static unsigned short fb_width, fb_height;
static unsigned char fb_bpp, fb_bytespp;
static unsigned char fb_rpos, fb_bpos, fb_gpos;
void initfb(unsigned long addr, unsigned short w, unsigned short h, unsigned char bpp, unsigned long pitch, unsigned char rpos, unsigned char gpos, unsigned char bpos) {
fb_address = addr;
fb_pitch = pitch;
fb_width = w;
fb_height = h;
fb_bpp = bpp;
fb_bytespp = bpp/8;
fb_rpos = rpos;
fb_gpos = gpos;
fb_bpos = bpos;
}
void putpixel(unsigned short x, unsigned short y, unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
*((unsigned long *)(fb_address + y*fb_pitch + x*fb_bytespp)) = r<<fb_rpos | g<<fb_gpos | b<<fb_bpos;
}

7
src/framebuffer.h Normal file
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#ifndef _FRAMEBUFFER_H
#define _FRAMEBUFFER_H 1
void initfb(unsigned long addr, unsigned short w, unsigned short h, unsigned char bpp, unsigned long pitch, unsigned char rpos, unsigned char gpos, unsigned char bpos);
void putpixel(unsigned short x, unsigned short y, unsigned char r, unsigned char g, unsigned char b, unsigned char a);
#endif

106
src/kernel.c
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@ -1,5 +1,5 @@
#include "multiboot.h"
#include "vga.h"
#include "framebuffer.h"
#include "serial.h"
#include "xtoa.h"
@ -18,90 +18,58 @@ void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
outb(0x3D4, 0x0A);
outb(0x3D5, 0x20);
//cls();
vga_init(VGA_COLOR_BLACK, VGA_COLOR_GRAY);
vga_write_line("=== KoalemOS ===");
if (serial_init() > 0) {
vga_write_line_color("Serial initialization failed", VGA_COLOR_BLACK,
VGA_COLOR_ORANGE);
} else {
vga_write_line("\nInitialized serial.");
serial_write_string("\n=== KoalemOS ===\n");
}
vga_write("Checking multiboot loader: ");
int serial_initialized = serial_init();
serial_write_string("\n=== KoalemOS ===\n");
// Check multiboot header
if (mbootmagick != MULTIBOOT_BOOTLOADER_MAGIC) {
vga_write_color("INVALID MAGIC", VGA_COLOR_BLACK, VGA_COLOR_RED);
return;
}
if (mbootinfo->flags & MULTIBOOT_INFO_BOOT_LOADER_NAME)
vga_write((char *)mbootinfo->boot_loader_name);
else
vga_write_color("Unknown", VGA_COLOR_BLACK, VGA_COLOR_ORANGE);
vga_write("\nMultiboot flags: ");
vga_write(itoa(mbootinfo->flags, 2));
serial_write_string("\nMultiboot flags: ");
serial_write_string(itoa(mbootinfo->flags, 2));
serial_write_string("\nMultiboot flags: ");
serial_write_string(itoa(mbootinfo->flags, 2));
// Check videomode
if (mbootinfo->flags & MULTIBOOT_INFO_VBE_INFO) {
vga_write("\nVBE Mode: 0x");
vga_write(itoa(mbootinfo->vbe_mode, 16));
serial_write_string("\nVBE Mode: 0x");
serial_write_string(itoa(mbootinfo->vbe_mode, 16));
serial_write_string("\nVBE Mode: 0x");
serial_write_string(itoa(mbootinfo->vbe_mode, 16));
}
if (mbootinfo->flags & MULTIBOOT_INFO_FRAMEBUFFER_INFO) {
vga_write("\nFramebuffer: ");
serial_write_string("\nFramebuffer: ");
vga_write("address: 0x");
serial_write_string("\n Address: 0x");
vga_write(ultoa(mbootinfo->framebuffer_addr, 16));
serial_write_string(ultoa(mbootinfo->framebuffer_addr, 16));
serial_write_string("\n Dimensions: ");
serial_write_string(itoa(mbootinfo->framebuffer_width, 10));
serial_write_string("X");
serial_write_string(itoa(mbootinfo->framebuffer_height, 10));
serial_write_string("x");
serial_write_string(itoa(mbootinfo->framebuffer_bpp, 10));
serial_write_string("\n Pitch: ");
serial_write_string(itoa(mbootinfo->framebuffer_pitch, 10));
serial_write_string("\n RPos:");
serial_write_string(itoa(mbootinfo->framebuffer_red_field_position, 10));
serial_write_string("\n GPos:");
serial_write_string(itoa(mbootinfo->framebuffer_green_field_position, 10));
serial_write_string("\n BPos:");
serial_write_string(itoa(mbootinfo->framebuffer_blue_field_position, 10));
if (!(mbootinfo->flags & MULTIBOOT_INFO_FRAMEBUFFER_INFO)) {
serial_write_string("\nVideo info not available");
return;
}
unsigned long *vmem;
int i;
for (i = 0; i < mbootinfo->framebuffer_height; i++) {
vmem = mbootinfo->framebuffer_addr + i*mbootinfo->framebuffer_pitch + i*(mbootinfo->framebuffer_bpp/8);
*vmem = 0xff<<mbootinfo->framebuffer_red_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_red_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_red_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_red_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_green_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_green_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_green_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_green_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_blue_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_blue_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_blue_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
*vmem = 0xff<<mbootinfo->framebuffer_blue_field_position;((char *)vmem)+=mbootinfo->framebuffer_bpp/8;
serial_write_string("\nFramebuffer: ");
serial_write_string("\n Address: 0x");
serial_write_string(ultoa(mbootinfo->framebuffer_addr, 16));
serial_write_string("\n Dimensions: ");
serial_write_string(itoa(mbootinfo->framebuffer_width, 10));
serial_write_string("X");
serial_write_string(itoa(mbootinfo->framebuffer_height, 10));
serial_write_string("x");
serial_write_string(itoa(mbootinfo->framebuffer_bpp, 10));
serial_write_string("\n Pitch: ");
serial_write_string(itoa(mbootinfo->framebuffer_pitch, 10));
serial_write_string("\n RPos:");
serial_write_string(itoa(mbootinfo->framebuffer_red_field_position, 10));
serial_write_string("\n GPos:");
serial_write_string(itoa(mbootinfo->framebuffer_green_field_position, 10));
serial_write_string("\n BPos:");
serial_write_string(itoa(mbootinfo->framebuffer_blue_field_position, 10));
initfb(mbootinfo->framebuffer_addr, mbootinfo->framebuffer_width, mbootinfo->framebuffer_height, mbootinfo->framebuffer_bpp, mbootinfo->framebuffer_pitch, mbootinfo->framebuffer_red_field_position, mbootinfo->framebuffer_green_field_position, mbootinfo->framebuffer_blue_field_position);
int x, y;
for (y=0; y<mbootinfo->framebuffer_height;y++) {
for (x=0; x<mbootinfo->framebuffer_width;x++) {
putpixel(x, y, 0, 255*x/mbootinfo->framebuffer_width, 255*y/mbootinfo->framebuffer_height, 0xff);
}
} else {
vga_write_color("\nVideo info not available", VGA_COLOR_BLACK, VGA_COLOR_RED);
serial_write_string("\nVideo info not available");
return;
}
vga_write_line("\nExecution finished, halting...");
serial_write_string("\nExecution finished, halting...");
}