1fa5142093
code for reading from the frame buffer. Reading from the frame buffer is usually much slower than writing to the frame buffer. Typically 10 to 100 times slower. It old modes, it takes many more PIOs, and in newer modes with no PIOs writes are often write-combined while reads remain uncached. Reading from the frame buffer is not very common, so this change doesn't give speedups of 10 to 100 times. My main test case is a floodfill() function that reads about as many pixels as it writes. The speedups are typically a factor of 2 to 4. Duplicating writes to the shadow buffer is slower when no reads from the frame buffer are done, but reads are often done for the pixels under the mouse cursor, and doing these reads from the shadow buffer more than compensates for the overhead of writing the shadow buffer in at least the slower modes. Management of the mouse cursor also becomes simpler. The shadow buffer doesn't take any extra memory, except twice as much in old 4-plane modes. A buffer for holding a copy of the frame buffer was allocated up front for use in the screen switching signal handler. This wasn't changed when the handler was made async-signal safe. Use the same buffer the shadow (but make it twice as large in the 4-plane modes), and remove large special code for writing it as well as large special code for reading ut. It used to have a rawer format in the 4-plane modes. Now it has a bitmap format which takes twice as much memory but can be written almost as fast without special code. VIDBUFs that are not the whole frame buffer were never supported, and the change depends on this. Check for invalid VIDBUFs in some places and do nothing. The removed code did something not so good.
646 lines
17 KiB
C
646 lines
17 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991-1997 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <signal.h>
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#include <sys/fbio.h>
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#include <sys/kbio.h>
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#include <sys/endian.h>
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#include "vgl.h"
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static int VGLBlank;
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static byte VGLBorderColor;
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static byte VGLSavePaletteRed[256];
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static byte VGLSavePaletteGreen[256];
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static byte VGLSavePaletteBlue[256];
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#define ABS(a) (((a)<0) ? -(a) : (a))
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#define SGN(a) (((a)<0) ? -1 : 1)
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#define min(x, y) (((x) < (y)) ? (x) : (y))
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#define max(x, y) (((x) > (y)) ? (x) : (y))
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void
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VGLSetXY(VGLBitmap *object, int x, int y, u_long color)
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{
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int offset;
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VGLCheckSwitch();
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if (x>=0 && x<object->VXsize && y>=0 && y<object->VYsize) {
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if (object == VGLDisplay)
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VGLSetXY(&VGLVDisplay, x, y, color);
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if (object->Type == MEMBUF ||
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!VGLMouseFreeze(x, y, 1, 1, 0x80000000 | color)) {
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offset = (y * object->VXsize + x) * object->PixelBytes;
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switch (object->Type) {
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case VIDBUF8S:
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case VIDBUF16S:
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case VIDBUF24S:
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case VIDBUF32S:
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offset = VGLSetSegment(offset);
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/* FALLTHROUGH */
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case MEMBUF:
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case VIDBUF8:
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case VIDBUF16:
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case VIDBUF24:
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case VIDBUF32:
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color = htole32(color);
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switch (object->PixelBytes) {
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case 1:
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memcpy(&object->Bitmap[offset], &color, 1);
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break;
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case 2:
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memcpy(&object->Bitmap[offset], &color, 2);
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break;
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case 3:
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memcpy(&object->Bitmap[offset], &color, 3);
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break;
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case 4:
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memcpy(&object->Bitmap[offset], &color, 4);
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break;
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}
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break;
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case VIDBUF8X:
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outb(0x3c4, 0x02);
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outb(0x3c5, 0x01 << (x&0x3));
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object->Bitmap[(unsigned)(VGLAdpInfo.va_line_width*y)+(x/4)] = ((byte)color);
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break;
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case VIDBUF4S:
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offset = VGLSetSegment(y*VGLAdpInfo.va_line_width + x/8);
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goto set_planar;
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case VIDBUF4:
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offset = y*VGLAdpInfo.va_line_width + x/8;
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set_planar:
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outb(0x3c4, 0x02); outb(0x3c5, 0x0f);
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outb(0x3ce, 0x00); outb(0x3cf, (byte)color & 0x0f); /* set/reset */
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outb(0x3ce, 0x01); outb(0x3cf, 0x0f); /* set/reset enable */
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outb(0x3ce, 0x08); outb(0x3cf, 0x80 >> (x%8)); /* bit mask */
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object->Bitmap[offset] |= (byte)color;
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}
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}
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if (object->Type != MEMBUF)
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VGLMouseUnFreeze();
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}
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}
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static u_long
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__VGLGetXY(VGLBitmap *object, int x, int y)
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{
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int offset;
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u_long color;
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offset = (y * object->VXsize + x) * object->PixelBytes;
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switch (object->PixelBytes) {
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case 1:
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memcpy(&color, &object->Bitmap[offset], 1);
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return le32toh(color) & 0xff;
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case 2:
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memcpy(&color, &object->Bitmap[offset], 2);
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return le32toh(color) & 0xffff;
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case 3:
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memcpy(&color, &object->Bitmap[offset], 3);
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return le32toh(color) & 0xffffff;
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case 4:
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memcpy(&color, &object->Bitmap[offset], 4);
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return le32toh(color);
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}
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return 0; /* invalid */
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}
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u_long
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VGLGetXY(VGLBitmap *object, int x, int y)
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{
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VGLCheckSwitch();
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if (x<0 || x>=object->VXsize || y<0 || y>=object->VYsize)
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return 0;
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if (object == VGLDisplay)
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object = &VGLVDisplay;
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if (object->Type != MEMBUF)
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return 0; /* invalid */
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return __VGLGetXY(object, x, y);
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}
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/*
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* Symmetric Double Step Line Algorithm by Brian Wyvill from
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* "Graphics Gems", Academic Press, 1990.
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*/
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#define SL_SWAP(a,b) {a^=b; b^=a; a^=b;}
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#define SL_ABSOLUTE(i,j,k) ( (i-j)*(k = ( (i-j)<0 ? -1 : 1)))
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void
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plot(VGLBitmap * object, int x, int y, int flag, u_long color)
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{
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/* non-zero flag indicates the pixels need swapping back. */
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if (flag)
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VGLSetXY(object, y, x, color);
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else
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VGLSetXY(object, x, y, color);
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}
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void
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VGLLine(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color)
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{
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int dx, dy, incr1, incr2, D, x, y, xend, c, pixels_left;
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int sign_x, sign_y, step, reverse, i;
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dx = SL_ABSOLUTE(x2, x1, sign_x);
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dy = SL_ABSOLUTE(y2, y1, sign_y);
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/* decide increment sign by the slope sign */
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if (sign_x == sign_y)
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step = 1;
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else
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step = -1;
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if (dy > dx) { /* chooses axis of greatest movement (make dx) */
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SL_SWAP(x1, y1);
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SL_SWAP(x2, y2);
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SL_SWAP(dx, dy);
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reverse = 1;
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} else
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reverse = 0;
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/* note error check for dx==0 should be included here */
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if (x1 > x2) { /* start from the smaller coordinate */
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x = x2;
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y = y2;
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/* x1 = x1;
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y1 = y1; */
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} else {
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x = x1;
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y = y1;
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x1 = x2;
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y1 = y2;
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}
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/* Note dx=n implies 0 - n or (dx+1) pixels to be set */
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/* Go round loop dx/4 times then plot last 0,1,2 or 3 pixels */
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/* In fact (dx-1)/4 as 2 pixels are already plotted */
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xend = (dx - 1) / 4;
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pixels_left = (dx - 1) % 4; /* number of pixels left over at the
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* end */
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plot(object, x, y, reverse, color);
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if (pixels_left < 0)
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return; /* plot only one pixel for zero length
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* vectors */
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plot(object, x1, y1, reverse, color); /* plot first two points */
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incr2 = 4 * dy - 2 * dx;
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if (incr2 < 0) { /* slope less than 1/2 */
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c = 2 * dy;
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incr1 = 2 * c;
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D = incr1 - dx;
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for (i = 0; i < xend; i++) { /* plotting loop */
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++x;
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--x1;
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if (D < 0) {
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/* pattern 1 forwards */
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plot(object, x, y, reverse, color);
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plot(object, ++x, y, reverse, color);
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/* pattern 1 backwards */
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plot(object, x1, y1, reverse, color);
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plot(object, --x1, y1, reverse, color);
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D += incr1;
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} else {
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if (D < c) {
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/* pattern 2 forwards */
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plot(object, x, y, reverse, color);
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plot(object, ++x, y += step, reverse,
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color);
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/* pattern 2 backwards */
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plot(object, x1, y1, reverse, color);
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plot(object, --x1, y1 -= step, reverse,
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color);
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} else {
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/* pattern 3 forwards */
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plot(object, x, y += step, reverse, color);
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plot(object, ++x, y, reverse, color);
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/* pattern 3 backwards */
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plot(object, x1, y1 -= step, reverse,
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color);
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plot(object, --x1, y1, reverse, color);
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}
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D += incr2;
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}
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} /* end for */
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/* plot last pattern */
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if (pixels_left) {
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if (D < 0) {
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plot(object, ++x, y, reverse, color); /* pattern 1 */
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if (pixels_left > 1)
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plot(object, ++x, y, reverse, color);
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if (pixels_left > 2)
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plot(object, --x1, y1, reverse, color);
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} else {
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if (D < c) {
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plot(object, ++x, y, reverse, color); /* pattern 2 */
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if (pixels_left > 1)
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plot(object, ++x, y += step, reverse, color);
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if (pixels_left > 2)
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plot(object, --x1, y1, reverse, color);
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} else {
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/* pattern 3 */
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plot(object, ++x, y += step, reverse, color);
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if (pixels_left > 1)
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plot(object, ++x, y, reverse, color);
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if (pixels_left > 2)
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plot(object, --x1, y1 -= step, reverse, color);
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}
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}
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} /* end if pixels_left */
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}
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/* end slope < 1/2 */
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else { /* slope greater than 1/2 */
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c = 2 * (dy - dx);
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incr1 = 2 * c;
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D = incr1 + dx;
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for (i = 0; i < xend; i++) {
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++x;
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--x1;
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if (D > 0) {
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/* pattern 4 forwards */
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plot(object, x, y += step, reverse, color);
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plot(object, ++x, y += step, reverse, color);
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/* pattern 4 backwards */
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plot(object, x1, y1 -= step, reverse, color);
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plot(object, --x1, y1 -= step, reverse, color);
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D += incr1;
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} else {
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if (D < c) {
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/* pattern 2 forwards */
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plot(object, x, y, reverse, color);
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plot(object, ++x, y += step, reverse,
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color);
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/* pattern 2 backwards */
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plot(object, x1, y1, reverse, color);
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plot(object, --x1, y1 -= step, reverse,
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color);
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} else {
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/* pattern 3 forwards */
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plot(object, x, y += step, reverse, color);
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plot(object, ++x, y, reverse, color);
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/* pattern 3 backwards */
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plot(object, x1, y1 -= step, reverse, color);
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plot(object, --x1, y1, reverse, color);
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}
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D += incr2;
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}
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} /* end for */
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/* plot last pattern */
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if (pixels_left) {
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if (D > 0) {
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plot(object, ++x, y += step, reverse, color); /* pattern 4 */
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if (pixels_left > 1)
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plot(object, ++x, y += step, reverse,
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color);
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if (pixels_left > 2)
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plot(object, --x1, y1 -= step, reverse,
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color);
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} else {
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if (D < c) {
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plot(object, ++x, y, reverse, color); /* pattern 2 */
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if (pixels_left > 1)
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plot(object, ++x, y += step, reverse, color);
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if (pixels_left > 2)
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plot(object, --x1, y1, reverse, color);
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} else {
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/* pattern 3 */
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plot(object, ++x, y += step, reverse, color);
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if (pixels_left > 1)
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plot(object, ++x, y, reverse, color);
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if (pixels_left > 2) {
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if (D > c) /* step 3 */
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plot(object, --x1, y1 -= step, reverse, color);
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else /* step 2 */
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plot(object, --x1, y1, reverse, color);
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}
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}
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}
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}
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}
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}
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void
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VGLBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color)
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{
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VGLLine(object, x1, y1, x2, y1, color);
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VGLLine(object, x2, y1, x2, y2, color);
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VGLLine(object, x2, y2, x1, y2, color);
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VGLLine(object, x1, y2, x1, y1, color);
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}
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void
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VGLFilledBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color)
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{
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int y;
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for (y=y1; y<=y2; y++) VGLLine(object, x1, y, x2, y, color);
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}
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static inline void
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set4pixels(VGLBitmap *object, int x, int y, int xc, int yc, u_long color)
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{
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if (x!=0) {
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VGLSetXY(object, xc+x, yc+y, color);
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VGLSetXY(object, xc-x, yc+y, color);
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if (y!=0) {
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VGLSetXY(object, xc+x, yc-y, color);
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VGLSetXY(object, xc-x, yc-y, color);
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}
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}
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else {
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VGLSetXY(object, xc, yc+y, color);
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if (y!=0)
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VGLSetXY(object, xc, yc-y, color);
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}
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}
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void
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VGLEllipse(VGLBitmap *object, int xc, int yc, int a, int b, u_long color)
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{
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int x = 0, y = b, asq = a*a, asq2 = a*a*2, bsq = b*b;
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int bsq2 = b*b*2, d = bsq-asq*b+asq/4, dx = 0, dy = asq2*b;
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while (dx<dy) {
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set4pixels(object, x, y, xc, yc, color);
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if (d>0) {
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y--; dy-=asq2; d-=dy;
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}
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x++; dx+=bsq2; d+=bsq+dx;
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}
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d+=(3*(asq-bsq)/2-(dx+dy))/2;
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while (y>=0) {
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set4pixels(object, x, y, xc, yc, color);
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if (d<0) {
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x++; dx+=bsq2; d+=dx;
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}
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y--; dy-=asq2; d+=asq-dy;
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}
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}
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static inline void
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set2lines(VGLBitmap *object, int x, int y, int xc, int yc, u_long color)
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{
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if (x!=0) {
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VGLLine(object, xc+x, yc+y, xc-x, yc+y, color);
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if (y!=0)
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VGLLine(object, xc+x, yc-y, xc-x, yc-y, color);
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}
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else {
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VGLLine(object, xc, yc+y, xc, yc-y, color);
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}
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}
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void
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VGLFilledEllipse(VGLBitmap *object, int xc, int yc, int a, int b, u_long color)
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{
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int x = 0, y = b, asq = a*a, asq2 = a*a*2, bsq = b*b;
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int bsq2 = b*b*2, d = bsq-asq*b+asq/4, dx = 0, dy = asq2*b;
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while (dx<dy) {
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set2lines(object, x, y, xc, yc, color);
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if (d>0) {
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y--; dy-=asq2; d-=dy;
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}
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x++; dx+=bsq2; d+=bsq+dx;
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}
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d+=(3*(asq-bsq)/2-(dx+dy))/2;
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while (y>=0) {
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set2lines(object, x, y, xc, yc, color);
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if (d<0) {
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x++; dx+=bsq2; d+=dx;
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}
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y--; dy-=asq2; d+=asq-dy;
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}
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}
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void
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VGLClear(VGLBitmap *object, u_long color)
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{
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VGLBitmap src;
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int offset;
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int len;
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int i;
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VGLCheckSwitch();
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if (object == VGLDisplay) {
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VGLMouseFreeze(0, 0, object->Xsize, object->Ysize, color);
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|
VGLClear(&VGLVDisplay, color);
|
|
} else if (object->Type != MEMBUF)
|
|
return; /* invalid */
|
|
switch (object->Type) {
|
|
case MEMBUF:
|
|
case VIDBUF8:
|
|
case VIDBUF8S:
|
|
case VIDBUF16:
|
|
case VIDBUF16S:
|
|
case VIDBUF24:
|
|
case VIDBUF24S:
|
|
case VIDBUF32:
|
|
case VIDBUF32S:
|
|
src.Type = MEMBUF;
|
|
src.Xsize = object->Xsize;
|
|
src.VXsize = object->VXsize;
|
|
src.Ysize = 1;
|
|
src.VYsize = 1;
|
|
src.Xorigin = 0;
|
|
src.Yorigin = 0;
|
|
src.Bitmap = alloca(object->VXsize * object->PixelBytes);
|
|
src.PixelBytes = object->PixelBytes;
|
|
color = htole32(color);
|
|
for (i = 0; i < object->VXsize; i++)
|
|
bcopy(&color, src.Bitmap + i * object->PixelBytes, object->PixelBytes);
|
|
for (i = 0; i < object->VYsize; i++)
|
|
__VGLBitmapCopy(&src, 0, 0, object, 0, i, object->VXsize, 1);
|
|
break;
|
|
|
|
case VIDBUF8X:
|
|
/* XXX works only for Xsize % 4 = 0 */
|
|
outb(0x3c6, 0xff);
|
|
outb(0x3c4, 0x02); outb(0x3c5, 0x0f);
|
|
memset(object->Bitmap, (byte)color, VGLAdpInfo.va_line_width*object->VYsize);
|
|
break;
|
|
|
|
case VIDBUF4:
|
|
case VIDBUF4S:
|
|
/* XXX works only for Xsize % 8 = 0 */
|
|
outb(0x3c4, 0x02); outb(0x3c5, 0x0f);
|
|
outb(0x3ce, 0x05); outb(0x3cf, 0x02); /* mode 2 */
|
|
outb(0x3ce, 0x01); outb(0x3cf, 0x00); /* set/reset enable */
|
|
outb(0x3ce, 0x08); outb(0x3cf, 0xff); /* bit mask */
|
|
for (offset = 0; offset < VGLAdpInfo.va_line_width*object->VYsize; ) {
|
|
VGLSetSegment(offset);
|
|
len = min(object->VXsize*object->VYsize - offset,
|
|
VGLAdpInfo.va_window_size);
|
|
memset(object->Bitmap, (byte)color, len);
|
|
offset += len;
|
|
}
|
|
outb(0x3ce, 0x05); outb(0x3cf, 0x00);
|
|
break;
|
|
}
|
|
if (object == VGLDisplay)
|
|
VGLMouseUnFreeze();
|
|
}
|
|
|
|
void
|
|
VGLRestorePalette()
|
|
{
|
|
int i;
|
|
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT)
|
|
return;
|
|
outb(0x3C6, 0xFF);
|
|
inb(0x3DA);
|
|
outb(0x3C8, 0x00);
|
|
for (i=0; i<256; i++) {
|
|
outb(0x3C9, VGLSavePaletteRed[i]);
|
|
inb(0x84);
|
|
outb(0x3C9, VGLSavePaletteGreen[i]);
|
|
inb(0x84);
|
|
outb(0x3C9, VGLSavePaletteBlue[i]);
|
|
inb(0x84);
|
|
}
|
|
inb(0x3DA);
|
|
outb(0x3C0, 0x20);
|
|
}
|
|
|
|
void
|
|
VGLSavePalette()
|
|
{
|
|
int i;
|
|
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT)
|
|
return;
|
|
outb(0x3C6, 0xFF);
|
|
inb(0x3DA);
|
|
outb(0x3C7, 0x00);
|
|
for (i=0; i<256; i++) {
|
|
VGLSavePaletteRed[i] = inb(0x3C9);
|
|
inb(0x84);
|
|
VGLSavePaletteGreen[i] = inb(0x3C9);
|
|
inb(0x84);
|
|
VGLSavePaletteBlue[i] = inb(0x3C9);
|
|
inb(0x84);
|
|
}
|
|
inb(0x3DA);
|
|
outb(0x3C0, 0x20);
|
|
}
|
|
|
|
void
|
|
VGLSetPalette(byte *red, byte *green, byte *blue)
|
|
{
|
|
int i;
|
|
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT)
|
|
return;
|
|
for (i=0; i<256; i++) {
|
|
VGLSavePaletteRed[i] = red[i];
|
|
VGLSavePaletteGreen[i] = green[i];
|
|
VGLSavePaletteBlue[i] = blue[i];
|
|
}
|
|
VGLCheckSwitch();
|
|
outb(0x3C6, 0xFF);
|
|
inb(0x3DA);
|
|
outb(0x3C8, 0x00);
|
|
for (i=0; i<256; i++) {
|
|
outb(0x3C9, VGLSavePaletteRed[i]);
|
|
inb(0x84);
|
|
outb(0x3C9, VGLSavePaletteGreen[i]);
|
|
inb(0x84);
|
|
outb(0x3C9, VGLSavePaletteBlue[i]);
|
|
inb(0x84);
|
|
}
|
|
inb(0x3DA);
|
|
outb(0x3C0, 0x20);
|
|
}
|
|
|
|
void
|
|
VGLSetPaletteIndex(byte color, byte red, byte green, byte blue)
|
|
{
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT)
|
|
return;
|
|
VGLSavePaletteRed[color] = red;
|
|
VGLSavePaletteGreen[color] = green;
|
|
VGLSavePaletteBlue[color] = blue;
|
|
VGLCheckSwitch();
|
|
outb(0x3C6, 0xFF);
|
|
inb(0x3DA);
|
|
outb(0x3C8, color);
|
|
outb(0x3C9, red); outb(0x3C9, green); outb(0x3C9, blue);
|
|
inb(0x3DA);
|
|
outb(0x3C0, 0x20);
|
|
}
|
|
|
|
void
|
|
VGLRestoreBorder(void)
|
|
{
|
|
VGLSetBorder(VGLBorderColor);
|
|
}
|
|
|
|
void
|
|
VGLSetBorder(byte color)
|
|
{
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT && ioctl(0, KDENABIO, 0))
|
|
return;
|
|
VGLCheckSwitch();
|
|
inb(0x3DA);
|
|
outb(0x3C0,0x11); outb(0x3C0, color);
|
|
inb(0x3DA);
|
|
outb(0x3C0, 0x20);
|
|
VGLBorderColor = color;
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT)
|
|
ioctl(0, KDDISABIO, 0);
|
|
}
|
|
|
|
void
|
|
VGLRestoreBlank(void)
|
|
{
|
|
VGLBlankDisplay(VGLBlank);
|
|
}
|
|
|
|
void
|
|
VGLBlankDisplay(int blank)
|
|
{
|
|
byte val;
|
|
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT && ioctl(0, KDENABIO, 0))
|
|
return;
|
|
VGLCheckSwitch();
|
|
outb(0x3C4, 0x01); val = inb(0x3C5); outb(0x3C4, 0x01);
|
|
outb(0x3C5, ((blank) ? (val |= 0x20) : (val &= 0xDF)));
|
|
VGLBlank = blank;
|
|
if (VGLModeInfo.vi_mem_model == V_INFO_MM_DIRECT)
|
|
ioctl(0, KDDISABIO, 0);
|
|
}
|