ref: 7d7650dffc20c3853eb1acd551c9a02f73751ae3
dir: /sys/src/games/doom/v_video.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
// Gamma correction LUT stuff.
// Functions to draw patches (by post) directly to screen.
// Functions to blit a block to the screen.
//
//-----------------------------------------------------------------------------
static const char
rcsid[] = "$Id: v_video.c,v 1.5 1997/02/03 22:45:13 b1 Exp $";
#include "i_system.h"
#include "r_local.h"
#include "doomdef.h"
#include "doomdata.h"
#include "m_bbox.h"
#include "m_swap.h"
#include "v_video.h"
// Each screen is [SCREENWIDTH*SCREENHEIGHT];
byte* screens[5];
int dirtybox[4];
// Now where did these came from?
byte gammatable[5][256] =
{
{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,
97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,
113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255},
{2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,27,29,30,31,
32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,52,54,55,
56,57,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,
78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,
99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,
115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,129,
130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,
146,147,148,148,149,150,151,152,153,154,155,156,157,158,159,160,
161,162,163,163,164,165,166,167,168,169,170,171,172,173,174,175,
175,176,177,178,179,180,181,182,183,184,185,186,186,187,188,189,
190,191,192,193,194,195,196,196,197,198,199,200,201,202,203,204,
205,205,206,207,208,209,210,211,212,213,214,214,215,216,217,218,
219,220,221,222,222,223,224,225,226,227,228,229,230,230,231,232,
233,234,235,236,237,237,238,239,240,241,242,243,244,245,245,246,
247,248,249,250,251,252,252,253,254,255},
{4,7,9,11,13,15,17,19,21,22,24,26,27,29,30,32,33,35,36,38,39,40,42,
43,45,46,47,48,50,51,52,54,55,56,57,59,60,61,62,63,65,66,67,68,69,
70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,
94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,110,111,112,
113,114,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
129,130,131,132,133,133,134,135,136,137,138,139,140,141,142,143,144,
144,145,146,147,148,149,150,151,152,153,153,154,155,156,157,158,159,
160,160,161,162,163,164,165,166,166,167,168,169,170,171,172,172,173,
174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,187,188,
188,189,190,191,192,193,193,194,195,196,197,197,198,199,200,201,201,
202,203,204,205,206,206,207,208,209,210,210,211,212,213,213,214,215,
216,217,217,218,219,220,221,221,222,223,224,224,225,226,227,228,228,
229,230,231,231,232,233,234,235,235,236,237,238,238,239,240,241,241,
242,243,244,244,245,246,247,247,248,249,250,251,251,252,253,254,254,
255},
{8,12,16,19,22,24,27,29,31,34,36,38,40,41,43,45,47,49,50,52,53,55,
57,58,60,61,63,64,65,67,68,70,71,72,74,75,76,77,79,80,81,82,84,85,
86,87,88,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,107,
108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,
125,126,127,128,129,130,131,132,133,134,135,135,136,137,138,139,140,
141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,
155,156,157,158,159,160,160,161,162,163,164,165,165,166,167,168,169,
169,170,171,172,173,173,174,175,176,176,177,178,179,180,180,181,182,
183,183,184,185,186,186,187,188,189,189,190,191,192,192,193,194,195,
195,196,197,197,198,199,200,200,201,202,202,203,204,205,205,206,207,
207,208,209,210,210,211,212,212,213,214,214,215,216,216,217,218,219,
219,220,221,221,222,223,223,224,225,225,226,227,227,228,229,229,230,
231,231,232,233,233,234,235,235,236,237,237,238,238,239,240,240,241,
242,242,243,244,244,245,246,246,247,247,248,249,249,250,251,251,252,
253,253,254,254,255},
{16,23,28,32,36,39,42,45,48,50,53,55,57,60,62,64,66,68,69,71,73,75,76,
78,80,81,83,84,86,87,89,90,92,93,94,96,97,98,100,101,102,103,105,106,
107,108,109,110,112,113,114,115,116,117,118,119,120,121,122,123,124,
125,126,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,
142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,
156,157,158,159,159,160,161,162,163,163,164,165,166,166,167,168,169,
169,170,171,172,172,173,174,175,175,176,177,177,178,179,180,180,181,
182,182,183,184,184,185,186,187,187,188,189,189,190,191,191,192,193,
193,194,195,195,196,196,197,198,198,199,200,200,201,202,202,203,203,
204,205,205,206,207,207,208,208,209,210,210,211,211,212,213,213,214,
214,215,216,216,217,217,218,219,219,220,220,221,221,222,223,223,224,
224,225,225,226,227,227,228,228,229,229,230,230,231,232,232,233,233,
234,234,235,235,236,236,237,237,238,239,239,240,240,241,241,242,242,
243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,
251,252,252,253,254,254,255,255}
};
int usegamma;
//
// V_MarkRect
//
void
V_MarkRect
( int x,
int y,
int width,
int height )
{
M_AddToBox (dirtybox, x, y);
M_AddToBox (dirtybox, x+width-1, y+height-1);
}
//
// V_CopyRect
//
void
V_CopyRect
( int srcx,
int srcy,
int srcscrn,
int width,
int height,
int destx,
int desty,
int destscrn )
{
byte* src;
byte* dest;
#ifdef RANGECHECK
if (srcx<0
||srcx+width >SCREENWIDTH
|| srcy<0
|| srcy+height>SCREENHEIGHT
||destx<0||destx+width >SCREENWIDTH
|| desty<0
|| desty+height>SCREENHEIGHT
|| (unsigned)srcscrn>4
|| (unsigned)destscrn>4)
{
I_Error ("Bad V_CopyRect");
}
#endif
V_MarkRect (destx, desty, width, height);
src = screens[srcscrn]+SCREENWIDTH*srcy+srcx;
dest = screens[destscrn]+SCREENWIDTH*desty+destx;
for ( ; height>0 ; height--)
{
memcpy (dest, src, width);
src += SCREENWIDTH;
dest += SCREENWIDTH;
}
}
//
// V_DrawPatch
// Masks a column based masked pic to the screen.
//
void
V_DrawPatch
( int x,
int y,
int scrn,
patch_t* patch )
{
int count;
int col;
column_t* column;
byte* desttop;
byte* dest;
byte* source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
#ifdef RANGECHECK
if (x<0
||x+SHORT(patch->width) >SCREENWIDTH
|| y<0
|| y+SHORT(patch->height)>SCREENHEIGHT
|| (unsigned)scrn>4)
{
fprintf( stderr, "Patch at %d,%d exceeds LFB\n", x,y );
// No I_Error abort - what is up with TNT.WAD?
fprintf( stderr, "V_DrawPatch: bad patch (ignored)\n");
return;
}
#endif
if (!scrn)
V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height));
col = 0;
desttop = screens[scrn]+y*SCREENWIDTH+x;
w = SHORT(patch->width);
for ( ; col<w ; x++, col++, desttop++)
{
column = (column_t *)((byte *)patch + LONG(patch->columnofs[col]));
// step through the posts in a column
while (column->topdelta != 0xff )
{
source = (byte *)column + 3;
dest = desttop + column->topdelta*SCREENWIDTH;
count = column->length;
while (count--)
{
*dest = *source++;
dest += SCREENWIDTH;
}
column = (column_t *)( (byte *)column + column->length
+ 4 );
}
}
}
//
// V_DrawPatchFlipped
// Masks a column based masked pic to the screen.
// Flips horizontally, e.g. to mirror face.
//
void
V_DrawPatchFlipped
( int x,
int y,
int scrn,
patch_t* patch )
{
int count;
int col;
column_t* column;
byte* desttop;
byte* dest;
byte* source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
#ifdef RANGECHECK
if (x<0
||x+SHORT(patch->width) >SCREENWIDTH
|| y<0
|| y+SHORT(patch->height)>SCREENHEIGHT
|| (unsigned)scrn>4)
{
fprintf( stderr, "Patch origin %d,%d exceeds LFB\n", x,y );
I_Error ("Bad V_DrawPatch in V_DrawPatchFlipped");
}
#endif
if (!scrn)
V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height));
col = 0;
desttop = screens[scrn]+y*SCREENWIDTH+x;
w = SHORT(patch->width);
for ( ; col<w ; x++, col++, desttop++)
{
column = (column_t *)((byte *)patch + LONG(patch->columnofs[w-1-col]));
// step through the posts in a column
while (column->topdelta != 0xff )
{
source = (byte *)column + 3;
dest = desttop + column->topdelta*SCREENWIDTH;
count = column->length;
while (count--)
{
*dest = *source++;
dest += SCREENWIDTH;
}
column = (column_t *)( (byte *)column + column->length
+ 4 );
}
}
}
//
// V_DrawPatchDirect
// Draws directly to the screen on the pc.
//
void
V_DrawPatchDirect
( int x,
int y,
int scrn,
patch_t* patch )
{
V_DrawPatch (x,y,scrn, patch);
/*
int count;
int col;
column_t* column;
byte* desttop;
byte* dest;
byte* source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
#ifdef RANGECHECK
if (x<0
||x+SHORT(patch->width) >SCREENWIDTH
|| y<0
|| y+SHORT(patch->height)>SCREENHEIGHT
|| (unsigned)scrn>4)
{
I_Error ("Bad V_DrawPatchDirect");
}
#endif
// V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height));
desttop = destscreen + y*SCREENWIDTH/4 + (x>>2);
w = SHORT(patch->width);
for ( col = 0 ; col<w ; col++)
{
outp (SC_INDEX+1,1<<(x&3));
column = (column_t *)((byte *)patch + LONG(patch->columnofs[col]));
// step through the posts in a column
while (column->topdelta != 0xff )
{
source = (byte *)column + 3;
dest = desttop + column->topdelta*SCREENWIDTH/4;
count = column->length;
while (count--)
{
*dest = *source++;
dest += SCREENWIDTH/4;
}
column = (column_t *)( (byte *)column + column->length
+ 4 );
}
if ( ((++x)&3) == 0 )
desttop++; // go to next byte, not next plane
}*/
}
//
// V_DrawBlock
// Draw a linear block of pixels into the view buffer.
//
void
V_DrawBlock
( int x,
int y,
int scrn,
int width,
int height,
byte* src )
{
byte* dest;
#ifdef RANGECHECK
if (x<0
||x+width >SCREENWIDTH
|| y<0
|| y+height>SCREENHEIGHT
|| (unsigned)scrn>4 )
{
I_Error ("Bad V_DrawBlock");
}
#endif
V_MarkRect (x, y, width, height);
dest = screens[scrn] + y*SCREENWIDTH+x;
while (height--)
{
memcpy (dest, src, width);
src += width;
dest += SCREENWIDTH;
}
}
//
// V_GetBlock
// Gets a linear block of pixels from the view buffer.
//
void
V_GetBlock
( int x,
int y,
int scrn,
int width,
int height,
byte* dest )
{
byte* src;
#ifdef RANGECHECK
if (x<0
||x+width >SCREENWIDTH
|| y<0
|| y+height>SCREENHEIGHT
|| (unsigned)scrn>4 )
{
I_Error ("Bad V_DrawBlock");
}
#endif
src = screens[scrn] + y*SCREENWIDTH+x;
while (height--)
{
memcpy (dest, src, width);
src += SCREENWIDTH;
dest += width;
}
}
//
// V_Init
//
void V_Init (void)
{
int i;
byte* base;
// stick these in low dos memory on PCs
base = I_AllocLow (SCREENWIDTH*SCREENHEIGHT*4);
for (i=0 ; i<4 ; i++)
screens[i] = base + i*SCREENWIDTH*SCREENHEIGHT;
}