120 lines
3.9 KiB
C
120 lines
3.9 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: VGA terminal functions //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <lib/buf.h>
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#include <init/boot.h>
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#include <io/cursor.h>
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//
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// VGA-related macros
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//
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#define VGA_ComputeColorCode(fg, bg) ((fg) | (bg) << 4)
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#define VGA_ComputeOffset(term, x, y) ((y) * (term)->width + (x))
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#define VGA_ComputeEntry(ch, cl) (((ushort)(ch)) | (ushort)(cl) << 8)
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static uint bscroll = 0;
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//
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// VGA Buffer Flusher
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//
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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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uchar color = 0xf;
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uchar *currentLine = buf->wp - buf->lineLen - buf->lastLF;
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uchar *bufStart = (uchar *)lmax((size_t)buf->buf,
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(size_t)currentLine
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- (buf->nLines - 2 + bscroll) * buf->lineLen);
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uchar *ptr = bufStart;
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// Writes the buffer's content
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for (; ptr < buf->wp ; ptr++) {
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*fbp++ = VGA_ComputeEntry(*ptr, color);
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}
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// Update the cursor
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size_t curX = ((size_t)ptr - (size_t)bufStart) % buf->lineLen;
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size_t curY = ((size_t)ptr - (size_t)bufStart) / buf->lineLen;
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IoUpdateCursor(curX, curY);
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// 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) {
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const ushort filler = VGA_ComputeEntry(' ', color);
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while (fbp < fbe) *fbp++ = filler;
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}
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return EOK;
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}
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void IoScrollDown(void)
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{
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if (bscroll > 0)
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bscroll--;
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bvgaflusher(BStdOut);
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}
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void IoScrollUp(void)
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{
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// Keep the 8 below the 10 given to BOpenTermBufEx
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if (bscroll < BtVideoInfo.framebufferHeight * 8) /* XXX */
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bscroll++;
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bvgaflusher(BStdOut);
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}
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//
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// Initialize VGA buffer
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//
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error_t IoInitVGABuffer(void)
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{
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static char bvgabufsrc[1 * MB];
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static Buffer_t bvgabufstruct;
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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,
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BtVideoInfo.framebufferHeight,
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10, bvgaflusher);
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BEnableAutoScroll(BStdOut);
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BStdDbg = BStdOut;
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return EOK;
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}
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