os-k/kaleid/kernel/io/vga.c

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//----------------------------------------------------------------------------//
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// OS on Kaleid //
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// //
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// Desc: VGA terminal functions //
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// //
// //
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// Copyright © 2018-2021 The OS/K Team //
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// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <libbuf.h>
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#include <init/boot.h>
#include <io/cursor.h>
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#include <io/vga.h>
const char *RtlColorNames[VGA_COLOR_WHITE+1] =
{
"Black", "Blue", "Green", "Cyan", "Red",
"Magenta", "Brown", "Light Grey", "Dark Grey",
"Light Blue", "Light Green", "Light Cyan",
"Light Red", "Light Magenta", "Light Brown", "White",
};
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//
// VGA-related macros
//
#define VGA_ComputeColorCode(fg, bg) ((fg) | (bg) << 4)
#define VGA_ComputeOffset(term, x, y) ((y) * (term)->width + (x))
#define VGA_ComputeEntry(ch, cl) (((ushort)(ch)) | (ushort)(cl) << 8)
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static uint bscroll = 0;
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static int bfg = VGA_COLOR_LIGHT_GREY;
static int bbg = VGA_COLOR_BLACK;
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static int cursorOffset = 0;
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//
// VGA Buffer Flusher
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//
error_t bvgaflusher(Buffer_t *buf)
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{
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ushort *fbp = BtVideoInfo.framebufferAddr;
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uint color = VGA_ComputeColorCode(bfg, bbg), cols = 0;
uint oldfg = bfg, skip, rem = BStdOut->lineLen;
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uchar *currentLine = buf->wp - buf->lastLF;
uchar *bufStart = (uchar *)lmax((size_t)buf->buf,
(size_t)currentLine
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- (buf->nLines - 1 + bscroll) * buf->lineLen);
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uchar *ptr = bufStart;
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for (skip = 0; ptr < buf->wp ; ptr++) {
// Handle color codes
if (*ptr >= RtlColorToChar(VGA_COLOR_BLACK)
&& *ptr <= RtlColorToChar(VGA_COLOR_WHITE)) {
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skip++; cols++; // 'cols' (colors) is for scrolling
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bfg = RtlCharToColor(*ptr);
}
// Write regular characters
else {
color = VGA_ComputeColorCode(bfg, bbg);
*fbp++ = VGA_ComputeEntry(*ptr, color);
}
// End of line?
if (--rem == 0) {
rem = BStdOut->lineLen;
cols = 0;
while (skip > 0) {
skip--;
*fbp++ = VGA_ComputeEntry(' ', color);
}
}
}
// Update the cursor
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size_t curX = ((size_t)ptr - (size_t)bufStart - cols) % buf->lineLen;
size_t curY = ((size_t)ptr - (size_t)bufStart) / buf->lineLen;
IoUpdateCursor(max(min(curX + cursorOffset, buf->lineLen), 0), curY);
// Empty the rest of the buffer
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const size_t bufSize = buf->nLines * buf->lineLen;
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ushort *fbe = BtVideoInfo.framebufferAddr
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+ (bufSize * sizeof(ushort));
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if (fbp < fbe) {
const ushort filler = VGA_ComputeEntry(' ', color);
while (fbp < fbe) *fbp++ = filler;
}
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bfg = oldfg;
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return EOK;
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}
int IoGetCursorOffset(void) {
return cursorOffset;
}
void IoSetCursorOffset(int ins) {
cursorOffset = ins;
}
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uint IoGetScroll(void)
{
return bscroll;
}
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void IoSetScroll(uint value)
{
bscroll = 0;
}
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void IoScrollDown(void)
{
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BLockBuf(BStdOut);
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if (bscroll > 0)
bscroll--;
bvgaflusher(BStdOut);
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BUnlockBuf(BStdOut);
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}
void IoScrollUp(void)
{
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BLockBuf(BStdOut);
uchar *currentLine = BStdOut->wp - BStdOut->lastLF;
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// Scrollable lines
uint scrabble = max(0, (currentLine-BStdOut->buf)/BStdOut->lineLen
- BStdOut->nLines + 1);
if (bscroll < scrabble)
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bscroll++;
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bvgaflusher(BStdOut);
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BUnlockBuf(BStdOut);
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}
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void IoChangeTermColor(int fg, int bg)
{
if (fg < 0) fg = bfg;
if (bg < 0) bg = bbg;
assert(fg <= VGA_COLOR_WHITE);
assert(bg <= VGA_COLOR_WHITE);
bfg = fg;
bbg = bg;
}
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//
// Initialize VGA buffer
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//
error_t IoInitVGABuffer(void)
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{
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static char bvgabufsrc[1 * MB];
static Buffer_t bvgabufstruct;
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static char bdbgbufsrc[1 * MB];
static Buffer_t bdbgbufstruct;
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BStdOut = &bvgabufstruct;
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BOpenTermBufEx(&BStdOut,
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bvgabufsrc, BS_WRONLY,
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BtVideoInfo.framebufferWidth,
BtVideoInfo.framebufferHeight,
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10, bvgaflusher);
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BEnableAutoScroll(BStdOut);
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#ifndef NDEBUG
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BStdDbg = &bdbgbufstruct;
BOpenTermBufEx(&BStdDbg,
bdbgbufsrc, BS_WRONLY,
BtVideoInfo.framebufferWidth,
BtVideoInfo.framebufferHeight,
10, NULL);
BEnableAutoScroll(BStdDbg);
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#else
BStdDbg = NULL;
#endif
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return EOK;
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}