ref: 52c05f4028fb90d8928ea4a4a2bf9ea261ec157c
dir: /src/heretic/r_draw.c/
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 1993-2008 Raven Software
// Copyright(C) 2005-2014 Simon Howard
//
// This program 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 2
// of the License, or (at your option) any later version.
//
// This program 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.
//
// R_draw.c
#include "doomdef.h"
#include "deh_str.h"
#include "r_local.h"
#include "i_video.h"
#include "v_video.h"
/*
All drawing to the view buffer is accomplished in this file. The other refresh
files only know about ccordinates, not the architecture of the frame buffer.
*/
byte *viewimage;
int viewwidth, scaledviewwidth, viewheight, viewwindowx, viewwindowy;
byte *ylookup[MAXHEIGHT];
int columnofs[MAXWIDTH];
byte translations[3][256]; // color tables for different players
/*
==================
=
= R_DrawColumn
=
= Source is the top of the column to scale
=
==================
*/
lighttable_t *dc_colormap;
int dc_x;
int dc_yl;
int dc_yh;
fixed_t dc_iscale;
fixed_t dc_texturemid;
byte *dc_source; // first pixel in a column (possibly virtual)
int dccount; // just for profiling
void R_DrawColumn(void)
{
int count;
byte *dest;
fixed_t frac, fracstep;
count = dc_yh - dc_yl;
if (count < 0)
return;
#ifdef RANGECHECK
if ((unsigned) dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
I_Error("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif
dest = ylookup[dc_yl] + columnofs[dc_x];
fracstep = dc_iscale;
frac = dc_texturemid + (dc_yl - centery) * fracstep;
do
{
*dest = dc_colormap[dc_source[(frac >> FRACBITS) & 127]];
dest += SCREENWIDTH;
frac += fracstep;
}
while (count--);
}
void R_DrawColumnLow(void)
{
int count;
byte *dest;
fixed_t frac, fracstep;
count = dc_yh - dc_yl;
if (count < 0)
return;
#ifdef RANGECHECK
if ((unsigned) dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
I_Error("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
// dccount++;
#endif
dest = ylookup[dc_yl] + columnofs[dc_x];
fracstep = dc_iscale;
frac = dc_texturemid + (dc_yl - centery) * fracstep;
do
{
*dest = dc_colormap[dc_source[(frac >> FRACBITS) & 127]];
dest += SCREENWIDTH;
frac += fracstep;
}
while (count--);
}
// Translucent column draw - blended with background using tinttable.
void R_DrawTLColumn(void)
{
int count;
byte *dest;
fixed_t frac, fracstep;
if (!dc_yl)
dc_yl = 1;
if (dc_yh == viewheight - 1)
dc_yh = viewheight - 2;
count = dc_yh - dc_yl;
if (count < 0)
return;
#ifdef RANGECHECK
if ((unsigned) dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
I_Error("R_DrawTLColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif
dest = ylookup[dc_yl] + columnofs[dc_x];
fracstep = dc_iscale;
frac = dc_texturemid + (dc_yl - centery) * fracstep;
do
{
*dest =
tinttable[((*dest) << 8) +
dc_colormap[dc_source[(frac >> FRACBITS) & 127]]];
dest += SCREENWIDTH;
frac += fracstep;
}
while (count--);
}
/*
========================
=
= R_DrawTranslatedColumn
=
========================
*/
byte *dc_translation;
byte *translationtables;
void R_DrawTranslatedColumn(void)
{
int count;
byte *dest;
fixed_t frac, fracstep;
count = dc_yh - dc_yl;
if (count < 0)
return;
#ifdef RANGECHECK
if ((unsigned) dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
I_Error("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif
dest = ylookup[dc_yl] + columnofs[dc_x];
fracstep = dc_iscale;
frac = dc_texturemid + (dc_yl - centery) * fracstep;
do
{
*dest = dc_colormap[dc_translation[dc_source[frac >> FRACBITS]]];
dest += SCREENWIDTH;
frac += fracstep;
}
while (count--);
}
void R_DrawTranslatedTLColumn(void)
{
int count;
byte *dest;
fixed_t frac, fracstep;
count = dc_yh - dc_yl;
if (count < 0)
return;
#ifdef RANGECHECK
if ((unsigned) dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
I_Error("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif
dest = ylookup[dc_yl] + columnofs[dc_x];
fracstep = dc_iscale;
frac = dc_texturemid + (dc_yl - centery) * fracstep;
do
{
*dest = tinttable[((*dest) << 8)
+
dc_colormap[dc_translation
[dc_source[frac >> FRACBITS]]]];
dest += SCREENWIDTH;
frac += fracstep;
}
while (count--);
}
//--------------------------------------------------------------------------
//
// PROC R_InitTranslationTables
//
//--------------------------------------------------------------------------
void R_InitTranslationTables(void)
{
int i;
V_LoadTintTable();
// Allocate translation tables
translationtables = Z_Malloc(256 * 3, PU_STATIC, 0);
// Fill out the translation tables
for (i = 0; i < 256; i++)
{
if (i >= 225 && i <= 240)
{
translationtables[i] = 114 + (i - 225); // yellow
translationtables[i + 256] = 145 + (i - 225); // red
translationtables[i + 512] = 190 + (i - 225); // blue
}
else
{
translationtables[i] = translationtables[i + 256]
= translationtables[i + 512] = i;
}
}
}
/*
================
=
= R_DrawSpan
=
================
*/
int ds_y;
int ds_x1;
int ds_x2;
lighttable_t *ds_colormap;
fixed_t ds_xfrac;
fixed_t ds_yfrac;
fixed_t ds_xstep;
fixed_t ds_ystep;
byte *ds_source; // start of a 64*64 tile image
int dscount; // just for profiling
void R_DrawSpan(void)
{
fixed_t xfrac, yfrac;
byte *dest;
int count, spot;
#ifdef RANGECHECK
if (ds_x2 < ds_x1 || ds_x1 < 0 || ds_x2 >= SCREENWIDTH
|| (unsigned) ds_y > SCREENHEIGHT)
I_Error("R_DrawSpan: %i to %i at %i", ds_x1, ds_x2, ds_y);
// dscount++;
#endif
xfrac = ds_xfrac;
yfrac = ds_yfrac;
dest = ylookup[ds_y] + columnofs[ds_x1];
count = ds_x2 - ds_x1;
do
{
spot = ((yfrac >> (16 - 6)) & (63 * 64)) + ((xfrac >> 16) & 63);
*dest++ = ds_colormap[ds_source[spot]];
xfrac += ds_xstep;
yfrac += ds_ystep;
}
while (count--);
}
void R_DrawSpanLow(void)
{
fixed_t xfrac, yfrac;
byte *dest;
int count, spot;
#ifdef RANGECHECK
if (ds_x2 < ds_x1 || ds_x1 < 0 || ds_x2 >= SCREENWIDTH
|| (unsigned) ds_y > SCREENHEIGHT)
I_Error("R_DrawSpan: %i to %i at %i", ds_x1, ds_x2, ds_y);
// dscount++;
#endif
xfrac = ds_xfrac;
yfrac = ds_yfrac;
dest = ylookup[ds_y] + columnofs[ds_x1];
count = ds_x2 - ds_x1;
do
{
spot = ((yfrac >> (16 - 6)) & (63 * 64)) + ((xfrac >> 16) & 63);
*dest++ = ds_colormap[ds_source[spot]];
xfrac += ds_xstep;
yfrac += ds_ystep;
}
while (count--);
}
/*
================
=
= R_InitBuffer
=
=================
*/
void R_InitBuffer(int width, int height)
{
int i;
viewwindowx = (SCREENWIDTH - width) >> 1;
for (i = 0; i < width; i++)
columnofs[i] = viewwindowx + i;
if (width == SCREENWIDTH)
viewwindowy = 0;
else
viewwindowy = (SCREENHEIGHT - SBARHEIGHT - height) >> 1;
for (i = 0; i < height; i++)
ylookup[i] = I_VideoBuffer + (i + viewwindowy) * SCREENWIDTH;
}
/*
==================
=
= R_DrawViewBorder
=
= Draws the border around the view for different size windows
==================
*/
boolean BorderNeedRefresh;
void R_DrawViewBorder(void)
{
byte *src, *dest;
int x, y;
if (scaledviewwidth == SCREENWIDTH)
return;
if (gamemode == shareware)
{
src = W_CacheLumpName(DEH_String("FLOOR04"), PU_CACHE);
}
else
{
src = W_CacheLumpName(DEH_String("FLAT513"), PU_CACHE);
}
dest = I_VideoBuffer;
for (y = 0; y < SCREENHEIGHT - SBARHEIGHT; y++)
{
for (x = 0; x < SCREENWIDTH / 64; x++)
{
memcpy(dest, src + ((y & 63) << 6), 64);
dest += 64;
}
if (SCREENWIDTH & 63)
{
memcpy(dest, src + ((y & 63) << 6), SCREENWIDTH & 63);
dest += (SCREENWIDTH & 63);
}
}
for (x = viewwindowx; x < viewwindowx + viewwidth; x += 16)
{
V_DrawPatch(x, viewwindowy - 4,
W_CacheLumpName(DEH_String("bordt"), PU_CACHE));
V_DrawPatch(x, viewwindowy + viewheight,
W_CacheLumpName(DEH_String("bordb"), PU_CACHE));
}
for (y = viewwindowy; y < viewwindowy + viewheight; y += 16)
{
V_DrawPatch(viewwindowx - 4, y,
W_CacheLumpName(DEH_String("bordl"), PU_CACHE));
V_DrawPatch(viewwindowx + viewwidth, y,
W_CacheLumpName(DEH_String("bordr"), PU_CACHE));
}
V_DrawPatch(viewwindowx - 4, viewwindowy - 4,
W_CacheLumpName(DEH_String("bordtl"), PU_CACHE));
V_DrawPatch(viewwindowx + viewwidth, viewwindowy - 4,
W_CacheLumpName(DEH_String("bordtr"), PU_CACHE));
V_DrawPatch(viewwindowx + viewwidth, viewwindowy + viewheight,
W_CacheLumpName(DEH_String("bordbr"), PU_CACHE));
V_DrawPatch(viewwindowx - 4, viewwindowy + viewheight,
W_CacheLumpName(DEH_String("bordbl"), PU_CACHE));
}
/*
==================
=
= R_DrawTopBorder
=
= Draws the top border around the view for different size windows
==================
*/
boolean BorderTopRefresh;
void R_DrawTopBorder(void)
{
byte *src, *dest;
int x, y;
if (scaledviewwidth == SCREENWIDTH)
return;
if (gamemode == shareware)
{
src = W_CacheLumpName(DEH_String("FLOOR04"), PU_CACHE);
}
else
{
src = W_CacheLumpName(DEH_String("FLAT513"), PU_CACHE);
}
dest = I_VideoBuffer;
for (y = 0; y < 30; y++)
{
for (x = 0; x < SCREENWIDTH / 64; x++)
{
memcpy(dest, src + ((y & 63) << 6), 64);
dest += 64;
}
if (SCREENWIDTH & 63)
{
memcpy(dest, src + ((y & 63) << 6), SCREENWIDTH & 63);
dest += (SCREENWIDTH & 63);
}
}
if (viewwindowy < 25)
{
for (x = viewwindowx; x < viewwindowx + viewwidth; x += 16)
{
V_DrawPatch(x, viewwindowy - 4,
W_CacheLumpName(DEH_String("bordt"), PU_CACHE));
}
V_DrawPatch(viewwindowx - 4, viewwindowy,
W_CacheLumpName(DEH_String("bordl"), PU_CACHE));
V_DrawPatch(viewwindowx + viewwidth, viewwindowy,
W_CacheLumpName(DEH_String("bordr"), PU_CACHE));
V_DrawPatch(viewwindowx - 4, viewwindowy + 16,
W_CacheLumpName(DEH_String("bordl"), PU_CACHE));
V_DrawPatch(viewwindowx + viewwidth, viewwindowy + 16,
W_CacheLumpName(DEH_String("bordr"), PU_CACHE));
V_DrawPatch(viewwindowx - 4, viewwindowy - 4,
W_CacheLumpName(DEH_String("bordtl"), PU_CACHE));
V_DrawPatch(viewwindowx + viewwidth, viewwindowy - 4,
W_CacheLumpName(DEH_String("bordtr"), PU_CACHE));
}
}