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gzdoom-gles/src/r_drawt.cpp
Randy Heit 94ffa6d5ae - Added << operators for FString that function exactly like +=, except they 
are left-associative, so you can use them like you would with an ostream
  and append to a string in a single expression without any overhead from
  allocating temporary strings as would happen if you used the + operator.
  In other words, instead of this:
     string += "Some string " + "that is assembled" + " in parts";
  You can do this and be more efficient while still being just as readable:
     string << "Some string " << "that is assembled" << " in parts";
- Changed PCD_PRINTBIND to include the command in its output if it isn't
  bound.
- Fixed: ACS_ExecuteWithResultValue could not be used inside a script because
  DLevelScript::RunScript() was not reentrant, thanks to having a global stack.
  The stack should be local to each instance of RunScript.
- Fixed: rt_draw4cols() could get stuck in rare situations where it thinks it
  should be drawing something but doesn't. Since long-term I plan to just
  replace all the masked drawing the variants of maskwallscan, I'm not going
  to try and find the real cause and fix it there. Instead, it just detects
  the situation and bails out when it finds it.


SVN r492 (trunk)
2007-02-24 17:56:43 +00:00

1137 lines
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/*
** r_drawt.cpp
** Faster column drawers for modern processors
**
**---------------------------------------------------------------------------
** Copyright 1998-2006 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
** These functions stretch columns into a temporary buffer and then
** map them to the screen. On modern machines, this is faster than drawing
** them directly to the screen.
**
** Will I be able to even understand any of this if I come back to it later?
** Let's hope so. :-)
*/
#include "templates.h"
#include "doomtype.h"
#include "doomdef.h"
#include "r_defs.h"
#include "r_draw.h"
#include "r_main.h"
#include "r_things.h"
#include "v_video.h"
// I should have commented this stuff better.
//
// dc_temp is the buffer R_DrawColumnHoriz writes into.
// dc_tspans points into it.
// dc_ctspan points into dc_tspans.
// But what is horizspan, and what is its relation with dc_ctspan?
BYTE dc_temp[MAXHEIGHT*4];
unsigned int dc_tspans[4][MAXHEIGHT];
unsigned int *dc_ctspan[4];
unsigned int *horizspan[4];
#ifndef USEASM
// Copies one span at hx to the screen at sx.
void rt_copy1col_c (int hx, int sx, int yl, int yh)
{
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
if (count & 1) {
*dest = *source;
source += 4;
dest += pitch;
}
if (count & 2) {
dest[0] = source[0];
dest[pitch] = source[4];
source += 8;
dest += pitch*2;
}
if (!(count >>= 2))
return;
do {
dest[0] = source[0];
dest[pitch] = source[4];
dest[pitch*2] = source[8];
dest[pitch*3] = source[12];
source += 16;
dest += pitch*4;
} while (--count);
}
// Copies all four spans to the screen starting at sx.
void rt_copy4cols_c (int sx, int yl, int yh)
{
int *source;
int *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
dest = (int *)(ylookup[yl] + sx + dc_destorg);
source = (int *)(&dc_temp[yl*4]);
pitch = dc_pitch/sizeof(int);
if (count & 1) {
*dest = *source;
source += 4/sizeof(int);
dest += pitch;
}
if (!(count >>= 1))
return;
do {
dest[0] = source[0];
dest[pitch] = source[4/sizeof(int)];
source += 8/sizeof(int);
dest += pitch*2;
} while (--count);
}
// Maps one span at hx to the screen at sx.
void rt_map1col_c (int hx, int sx, int yl, int yh)
{
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
if (count & 1) {
*dest = colormap[*source];
source += 4;
dest += pitch;
}
if (!(count >>= 1))
return;
do {
dest[0] = colormap[source[0]];
dest[pitch] = colormap[source[4]];
source += 8;
dest += pitch*2;
} while (--count);
}
// Maps all four spans to the screen starting at sx.
void rt_map4cols_c (int sx, int yl, int yh)
{
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
if (count & 1) {
dest[0] = colormap[source[0]];
dest[1] = colormap[source[1]];
dest[2] = colormap[source[2]];
dest[3] = colormap[source[3]];
source += 4;
dest += pitch;
}
if (!(count >>= 1))
return;
do {
dest[0] = colormap[source[0]];
dest[1] = colormap[source[1]];
dest[2] = colormap[source[2]];
dest[3] = colormap[source[3]];
dest[pitch] = colormap[source[4]];
dest[pitch+1] = colormap[source[5]];
dest[pitch+2] = colormap[source[6]];
dest[pitch+3] = colormap[source[7]];
source += 8;
dest += pitch*2;
} while (--count);
}
#endif /* !USEASM */
// Translates one span at hx to the screen at sx.
void rt_tlate1col (int hx, int sx, int yl, int yh)
{
BYTE *translation;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
translation = dc_translation;
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
do {
*dest = colormap[translation[*source]];
source += 4;
dest += pitch;
} while (--count);
}
// Translates all four spans to the screen starting at sx.
void rt_tlate4cols (int sx, int yl, int yh)
{
BYTE *translation;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
translation = dc_translation;
count = yh-yl;
if (count < 0)
return;
count++;
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
do {
dest[0] = colormap[translation[source[0]]];
dest[1] = colormap[translation[source[1]]];
dest[2] = colormap[translation[source[2]]];
dest[3] = colormap[translation[source[3]]];
source += 4;
dest += pitch;
} while (--count);
}
// Adds one span at hx to the screen at sx without clamping.
void rt_add1col (int hx, int sx, int yl, int yh)
{
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
colormap = dc_colormap;
do {
DWORD fg = colormap[*source];
DWORD bg = *dest;
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
*dest = RGB32k[0][0][fg & (fg>>15)];
source += 4;
dest += pitch;
} while (--count);
}
// Adds all four spans to the screen starting at sx without clamping.
void rt_add4cols (int sx, int yl, int yh)
{
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
colormap = dc_colormap;
do {
DWORD fg = colormap[source[0]];
DWORD bg = dest[0];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[0] = RGB32k[0][0][fg & (fg>>15)];
fg = colormap[source[1]];
bg = dest[1];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[1] = RGB32k[0][0][fg & (fg>>15)];
fg = colormap[source[2]];
bg = dest[2];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[2] = RGB32k[0][0][fg & (fg>>15)];
fg = colormap[source[3]];
bg = dest[3];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[3] = RGB32k[0][0][fg & (fg>>15)];
source += 4;
dest += pitch;
} while (--count);
}
// Translates and adds one span at hx to the screen at sx without clamping.
void rt_tlateadd1col (int hx, int sx, int yl, int yh)
{
BYTE *translation;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
translation = dc_translation;
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
do {
DWORD fg = colormap[translation[*source]];
DWORD bg = *dest;
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
*dest = RGB32k[0][0][fg & (fg>>15)];
source += 4;
dest += pitch;
} while (--count);
}
// Translates and adds all four spans to the screen starting at sx without clamping.
void rt_tlateadd4cols (int sx, int yl, int yh)
{
BYTE *translation;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
translation = dc_translation;
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
do {
DWORD fg = colormap[translation[source[0]]];
DWORD bg = dest[0];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[0] = RGB32k[0][0][fg & (fg>>15)];
fg = colormap[translation[source[1]]];
bg = dest[1];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[1] = RGB32k[0][0][fg & (fg>>15)];
fg = colormap[translation[source[2]]];
bg = dest[2];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[2] = RGB32k[0][0][fg & (fg>>15)];
fg = colormap[translation[source[3]]];
bg = dest[3];
fg = fg2rgb[fg];
bg = bg2rgb[bg];
fg = (fg+bg) | 0x1f07c1f;
dest[3] = RGB32k[0][0][fg & (fg>>15)];
source += 4;
dest += pitch;
} while (--count);
}
// Shades one span at hx to the screen at sx.
void rt_shaded1col (int hx, int sx, int yl, int yh)
{
DWORD *fgstart;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
fgstart = &Col2RGB8[0][dc_color];
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
do {
DWORD val = colormap[*source];
DWORD fg = fgstart[val<<8];
val = (Col2RGB8[64-val][*dest] + fg) | 0x1f07c1f;
*dest = RGB32k[0][0][val & (val>>15)];
source += 4;
dest += pitch;
} while (--count);
}
// Shades all four spans to the screen starting at sx.
void rt_shaded4cols (int sx, int yl, int yh)
{
BYTE fill;
DWORD *fgstart;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
fgstart = &Col2RGB8[0][dc_color];
colormap = dc_colormap;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
{
DWORD val = fgstart[64<<8] | 0x1f07c1f;
fill = RGB32k[0][0][val & (val>>15)];
}
do {
DWORD val = colormap[source[0]];
DWORD fg;
if (val < 64)
{
fg = fgstart[val<<8];
val = (Col2RGB8[64-val][dest[0]] + fg) | 0x1f07c1f;
dest[0] = RGB32k[0][0][val & (val>>15)];
}
else
{
dest[0] = fill;
}
val = colormap[source[1]];
if (val < 64)
{
fg = fgstart[val<<8];
val = (Col2RGB8[64-val][dest[1]] + fg) | 0x1f07c1f;
dest[1] = RGB32k[0][0][val & (val>>15)];
}
else
{
dest[1] = fill;
}
val = colormap[source[2]];
if (val < 64)
{
fg = fgstart[val<<8];
val = (Col2RGB8[64-val][dest[2]] + fg) | 0x1f07c1f;
dest[2] = RGB32k[0][0][val & (val>>15)];
}
else
{
dest[2] = fill;
}
val = colormap[source[3]];
if (val < 64)
{
fg = fgstart[val<<8];
val = (Col2RGB8[64-val][dest[3]] + fg) | 0x1f07c1f;
dest[3] = RGB32k[0][0][val & (val>>15)];
}
else
{
dest[3] = fill;
}
source += 4;
dest += pitch;
} while (--count);
}
// Adds one span at hx to the screen at sx with clamping.
void rt_addclamp1col (int hx, int sx, int yl, int yh)
{
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
colormap = dc_colormap;
do {
DWORD a = fg2rgb[colormap[*source]] + bg2rgb[*dest];
DWORD b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
*dest = RGB32k[0][0][(a>>15) & a];
source += 4;
dest += pitch;
} while (--count);
}
// Adds all four spans to the screen starting at sx with clamping.
void rt_addclamp4cols (int sx, int yl, int yh)
{
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
colormap = dc_colormap;
do {
DWORD a = fg2rgb[colormap[source[0]]] + bg2rgb[dest[0]];
DWORD b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[0] = RGB32k[0][0][(a>>15) & a];
a = fg2rgb[colormap[source[1]]] + bg2rgb[dest[1]];
b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[1] = RGB32k[0][0][(a>>15) & a];
a = fg2rgb[colormap[source[2]]] + bg2rgb[dest[2]];
b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[2] = RGB32k[0][0][(a>>15) & a];
a = fg2rgb[colormap[source[3]]] + bg2rgb[dest[3]];
b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[3] = RGB32k[0][0][(a>>15) & a];
source += 4;
dest += pitch;
} while (--count);
}
// Translates and adds one span at hx to the screen at sx with clamping.
void rt_tlateaddclamp1col (int hx, int sx, int yl, int yh)
{
BYTE *translation;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4 + hx];
pitch = dc_pitch;
colormap = dc_colormap;
translation = dc_translation;
do {
DWORD a = fg2rgb[colormap[translation[*source]]] + bg2rgb[*dest];
DWORD b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
*dest = RGB32k[0][0][(a>>15) & a];
source += 4;
dest += pitch;
} while (--count);
}
// Translates and adds all four spans to the screen starting at sx with clamping.
void rt_tlateaddclamp4cols (int sx, int yl, int yh)
{
BYTE *translation;
BYTE *colormap;
BYTE *source;
BYTE *dest;
int count;
int pitch;
count = yh-yl;
if (count < 0)
return;
count++;
DWORD *fg2rgb = dc_srcblend;
DWORD *bg2rgb = dc_destblend;
dest = ylookup[yl] + sx + dc_destorg;
source = &dc_temp[yl*4];
pitch = dc_pitch;
colormap = dc_colormap;
translation = dc_translation;
do {
DWORD a = fg2rgb[colormap[translation[source[0]]]] + bg2rgb[dest[0]];
DWORD b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[0] = RGB32k[0][0][(a>>15) & a];
a = fg2rgb[colormap[translation[source[1]]]] + bg2rgb[dest[1]];
b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[1] = RGB32k[0][0][(a>>15) & a];
a = fg2rgb[colormap[translation[source[2]]]] + bg2rgb[dest[2]];
b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[2] = RGB32k[0][0][(a>>15) & a];
a = fg2rgb[colormap[translation[source[3]]]] + bg2rgb[dest[3]];
b = a;
a |= 0x01f07c1f;
b &= 0x40100400;
a &= 0x3fffffff;
b = b - (b >> 5);
a |= b;
dest[3] = RGB32k[0][0][(a>>15) & a];
source += 4;
dest += pitch;
} while (--count);
}
// Copies all spans in all four columns to the screen starting at sx.
// sx should be longword-aligned.
void rt_draw4cols (int sx)
{
int x, bad;
unsigned int maxtop, minbot, minnexttop;
// Place a dummy "span" in each column. These don't get
// drawn. They're just here to avoid special cases in the
// max/min calculations below.
for (x = 0; x < 4; ++x)
{
dc_ctspan[x][0] = screen->GetHeight()+1;
dc_ctspan[x][1] = screen->GetHeight();
}
for (;;)
{
// If a column is out of spans, mark it as such
bad = 0;
minnexttop = 0xffffffff;
for (x = 0; x < 4; ++x)
{
if (horizspan[x] >= dc_ctspan[x])
{
bad |= 1 << x;
}
else if ((horizspan[x]+2)[0] < minnexttop)
{
minnexttop = (horizspan[x]+2)[0];
}
}
// Once all columns are out of spans, we're done
if (bad == 15)
{
return;
}
// Find the largest shared area for the spans in each column
maxtop = MAX (MAX (horizspan[0][0], horizspan[1][0]),
MAX (horizspan[2][0], horizspan[3][0]));
minbot = MIN (MIN (horizspan[0][1], horizspan[1][1]),
MIN (horizspan[2][1], horizspan[3][1]));
// If there is no shared area with these spans, draw each span
// individually and advance to the next spans until we reach a shared area.
// However, only draw spans down to the highest span in the next set of
// spans. If we allow the entire height of a span to be drawn, it could
// prevent any more shared areas from being drawn in these four columns.
//
// Example: Suppose we have the following arrangement:
// A CD
// A CD
// B D
// B D
// aB D
// aBcD
// aBcD
// aBc
//
// If we draw the entire height of the spans, we end up drawing this first:
// A CD
// A CD
// B D
// B D
// B D
// B D
// B D
// B D
// B
//
// This leaves only the "a" and "c" columns to be drawn, and they are not
// part of a shared area, but if we can include B and D with them, we can
// get a shared area. So we cut off everything in the first set just
// above the "a" column and end up drawing this first:
// A CD
// A CD
// B D
// B D
//
// Then the next time through, we have the following arrangement with an
// easily shared area to draw:
// aB D
// aBcD
// aBcD
// aBc
if (bad != 0 || maxtop > minbot)
{
int drawcount = 0;
for (x = 0; x < 4; ++x)
{
if (!(bad & 1))
{
if (horizspan[x][1] < minnexttop)
{
hcolfunc_post1 (x, sx+x, horizspan[x][0], horizspan[x][1]);
horizspan[x] += 2;
drawcount++;
}
else if (minnexttop > horizspan[x][0])
{
hcolfunc_post1 (x, sx+x, horizspan[x][0], minnexttop-1);
horizspan[x][0] = minnexttop;
drawcount++;
}
}
bad >>= 1;
}
// Drawcount *should* always be non-zero. The reality is that some situations
// can make this not true. Unfortunately, I'm not sure what those situations are.
if (drawcount == 0)
{
return;
}
continue;
}
// Draw any span fragments above the shared area.
for (x = 0; x < 4; ++x)
{
if (maxtop > horizspan[x][0])
{
hcolfunc_post1 (x, sx+x, horizspan[x][0], maxtop-1);
}
}
// Draw the shared area.
hcolfunc_post4 (sx, maxtop, minbot);
// For each column, if part of the span is past the shared area,
// set its top to just below the shared area. Otherwise, advance
// to the next span in that column.
for (x = 0; x < 4; ++x)
{
if (minbot < horizspan[x][1])
{
horizspan[x][0] = minbot+1;
}
else
{
horizspan[x] += 2;
}
}
}
}
// Before each pass through a rendering loop that uses these routines,
// call this function to set up the span pointers.
void rt_initcols (void)
{
int y;
for (y = 3; y >= 0; y--)
horizspan[y] = dc_ctspan[y] = &dc_tspans[y][0];
}
// Stretches a column into a temporary buffer which is later
// drawn to the screen along with up to three other columns.
void R_DrawColumnHorizP_C (void)
{
int count = dc_count;
BYTE *dest;
fixed_t fracstep;
fixed_t frac;
if (count <= 0)
return;
{
int x = dc_x & 3;
unsigned int **span;
span = &dc_ctspan[x];
(*span)[0] = dc_yl;
(*span)[1] = dc_yh;
*span += 2;
dest = &dc_temp[x + 4*dc_yl];
}
fracstep = dc_iscale;
frac = dc_texturefrac;
{
const BYTE *source = dc_source;
if (count & 1) {
*dest = source[frac>>FRACBITS];
dest += 4;
frac += fracstep;
}
if (count & 2) {
dest[0] = source[frac>>FRACBITS];
frac += fracstep;
dest[4] = source[frac>>FRACBITS];
frac += fracstep;
dest += 8;
}
if (count & 4) {
dest[0] = source[frac>>FRACBITS];
frac += fracstep;
dest[4] = source[frac>>FRACBITS];
frac += fracstep;
dest[8] = source[frac>>FRACBITS];
frac += fracstep;
dest[12] = source[frac>>FRACBITS];
frac += fracstep;
dest += 16;
}
count >>= 3;
if (!count) return;
do
{
dest[0] = source[frac>>FRACBITS];
frac += fracstep;
dest[4] = source[frac>>FRACBITS];
frac += fracstep;
dest[8] = source[frac>>FRACBITS];
frac += fracstep;
dest[12] = source[frac>>FRACBITS];
frac += fracstep;
dest[16] = source[frac>>FRACBITS];
frac += fracstep;
dest[20] = source[frac>>FRACBITS];
frac += fracstep;
dest[24] = source[frac>>FRACBITS];
frac += fracstep;
dest[28] = source[frac>>FRACBITS];
frac += fracstep;
dest += 32;
} while (--count);
}
}
// [RH] Just fills a column with a given color
void R_FillColumnHorizP (void)
{
int count = dc_count;
BYTE color = dc_color;
BYTE *dest;
if (count <= 0)
return;
{
int x = dc_x & 3;
unsigned int **span = &dc_ctspan[x];
(*span)[0] = dc_yl;
(*span)[1] = dc_yh;
*span += 2;
dest = &dc_temp[x + 4*dc_yl];
}
if (count & 1) {
*dest = color;
dest += 4;
}
if (!(count >>= 1))
return;
do {
dest[0] = color;
dest[4] = color;
dest += 8;
} while (--count);
}
// Same as R_DrawMaskedColumn() except that it always uses R_DrawColumnHoriz().
void R_DrawMaskedColumnHoriz (const BYTE *column, const FTexture::Span *span)
{
while (span->Length != 0)
{
const int length = span->Length;
const int top = span->TopOffset;
// calculate unclipped screen coordinates for post
dc_yl = (sprtopscreen + spryscale * top) >> FRACBITS;
dc_yh = (sprtopscreen + spryscale * (top + length) - FRACUNIT) >> FRACBITS;
if (sprflipvert)
{
swap (dc_yl, dc_yh);
}
if (dc_yh >= mfloorclip[dc_x])
{
dc_yh = mfloorclip[dc_x] - 1;
}
if (dc_yl < mceilingclip[dc_x])
{
dc_yl = mceilingclip[dc_x];
}
if (dc_yl <= dc_yh)
{
if (sprflipvert)
{
dc_texturefrac = (dc_yl*dc_iscale) - (top << FRACBITS)
- FixedMul (centeryfrac, dc_iscale) - dc_texturemid;
const fixed_t maxfrac = length << FRACBITS;
while (dc_texturefrac >= maxfrac)
{
if (++dc_yl > dc_yh)
goto nextpost;
dc_texturefrac += dc_iscale;
}
fixed_t endfrac = dc_texturefrac + (dc_yh-dc_yl)*dc_iscale;
while (endfrac < 0)
{
if (--dc_yh < dc_yl)
goto nextpost;
endfrac -= dc_iscale;
}
}
else
{
dc_texturefrac = dc_texturemid - (top << FRACBITS)
+ (dc_yl*dc_iscale) - FixedMul (centeryfrac-FRACUNIT, dc_iscale);
while (dc_texturefrac < 0)
{
if (++dc_yl > dc_yh)
goto nextpost;
dc_texturefrac += dc_iscale;
}
fixed_t endfrac = dc_texturefrac + (dc_yh-dc_yl)*dc_iscale;
const fixed_t maxfrac = length << FRACBITS;
if (dc_yh < mfloorclip[dc_x]-1 && endfrac < maxfrac - dc_iscale)
{
dc_yh++;
}
else while (endfrac >= maxfrac)
{
if (--dc_yh < dc_yl)
goto nextpost;
endfrac -= dc_iscale;
}
}
dc_source = column + top;
dc_dest = ylookup[dc_yl] + dc_x + dc_destorg;
dc_count = dc_yh - dc_yl + 1;
hcolfunc_pre ();
}
nextpost:
span++;
}
if (sprflipvert)
{
unsigned int *front = horizspan[dc_x&3];
unsigned int *back = dc_ctspan[dc_x&3] - 2;
// Reorder the posts so that they get drawn top-to-bottom
// instead of bottom-to-top.
while (front < back)
{
swap (front[0], back[0]);
swap (front[1], back[1]);
front += 2;
back -= 2;
}
}
}
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