This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
sdlgenblit.pl
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#!/usr/bin/perl -w
#
# A script to generate optimized C blitters for Simple DirectMedia Layer
# http://www.libsdl.org/
use warnings;
use strict;
my %file;
# The formats potentially supported by this script:
# SDL_PIXELFORMAT_INDEX8
# SDL_PIXELFORMAT_RGB332
# SDL_PIXELFORMAT_RGB444
# SDL_PIXELFORMAT_RGB555
# SDL_PIXELFORMAT_ARGB4444
# SDL_PIXELFORMAT_ARGB1555
# SDL_PIXELFORMAT_RGB565
# SDL_PIXELFORMAT_RGB24
# SDL_PIXELFORMAT_BGR24
# SDL_PIXELFORMAT_RGB888
# SDL_PIXELFORMAT_BGR888
# SDL_PIXELFORMAT_ARGB8888
# SDL_PIXELFORMAT_RGBA8888
# SDL_PIXELFORMAT_ABGR8888
# SDL_PIXELFORMAT_BGRA8888
# SDL_PIXELFORMAT_ARGB2101010
# The formats we're actually creating blitters for:
my @src_formats = (
"RGB888",
"BGR888",
"ARGB8888",
"RGBA8888",
"ABGR8888",
"BGRA8888",
);
my @dst_formats = (
"RGB888",
"BGR888",
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"ARGB8888",
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);
my %format_size = (
"RGB888" => 4,
"BGR888" => 4,
"ARGB8888" => 4,
"RGBA8888" => 4,
"ABGR8888" => 4,
"BGRA8888" => 4,
);
my %format_type = (
"RGB888" => "Uint32",
"BGR888" => "Uint32",
"ARGB8888" => "Uint32",
"RGBA8888" => "Uint32",
"ABGR8888" => "Uint32",
"BGRA8888" => "Uint32",
);
my %get_rgba_string = (
"RGB888" => "_R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel; _A = 0xFF;",
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"BGR888" => "_B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel; _A = 0xFF;", "ARGB8888" => "_A = (Uint8)(_pixel >> 24); _R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel;",
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"RGBA8888" => "_R = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _B = (Uint8)(_pixel >> 8); _A = (Uint8)_pixel;",
"ABGR8888" => "_A = (Uint8)(_pixel >> 24); _B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel;",
"BGRA8888" => "_B = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _R = (Uint8)(_pixel >> 8); _A = (Uint8)_pixel;",
);
my %set_rgba_string = (
"RGB888" => "_pixel = ((Uint32)_R << 16) | ((Uint32)_G << 8) | _B;",
"BGR888" => "_pixel = ((Uint32)_B << 16) | ((Uint32)_G << 8) | _R;",
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"ARGB8888" => "_pixel = ((Uint32)_A << 24) | ((Uint32)_R << 16) | ((Uint32)_G << 8) | _B;",
"RGBA8888" => "_pixel = ((Uint32)_R << 24) | ((Uint32)_G << 16) | ((Uint32)_B << 8) | _A;",
"ABGR8888" => "_pixel = ((Uint32)_A << 24) | ((Uint32)_B << 16) | ((Uint32)_G << 8) | _R;",
"BGRA8888" => "_pixel = ((Uint32)_B << 24) | ((Uint32)_G << 16) | ((Uint32)_R << 8) | _A;",
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);
sub open_file {
my $name = shift;
open(FILE, ">$name.new") || die "Cant' open $name.new: $!";
print FILE <<__EOF__;
/* DO NOT EDIT! This file is generated by sdlgenblit.pl */
/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken\@libsdl.org
*/
#include "SDL_config.h"
/* *INDENT-OFF* */
__EOF__
}
sub close_file {
my $name = shift;
print FILE <<__EOF__;
/* *INDENT-ON* */
/* vi: set ts=4 sw=4 expandtab: */
__EOF__
close FILE;
if ( ! -f $name || system("cmp -s $name $name.new") != 0 ) {
rename("$name.new", "$name");
} else {
unlink("$name.new");
}
}
sub output_copydefs
{
print FILE <<__EOF__;
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extern SDL_BlitFuncEntry SDL_GeneratedBlitFuncTable[];
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__EOF__
}
sub output_copyfuncname
{
my $prefix = shift;
my $src = shift;
my $dst = shift;
my $modulate = shift;
my $blend = shift;
my $scale = shift;
my $args = shift;
my $suffix = shift;
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print FILE "$prefix SDL_Blit_${src}_${dst}";
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if ( $modulate ) {
print FILE "_Modulate";
}
if ( $blend ) {
print FILE "_Blend";
}
if ( $scale ) {
print FILE "_Scale";
}
if ( $args ) {
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print FILE "(SDL_BlitInfo *info)";
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}
print FILE "$suffix";
}
sub get_rgba
{
my $prefix = shift;
my $format = shift;
my $string = $get_rgba_string{$format};
$string =~ s/_/$prefix/g;
if ( $prefix ne "" ) {
print FILE <<__EOF__;
${prefix}pixel = *$prefix;
__EOF__
} else {
print FILE <<__EOF__;
pixel = *src;
__EOF__
}
print FILE <<__EOF__;
$string
__EOF__
}
sub set_rgba
{
my $prefix = shift;
my $format = shift;
my $string = $set_rgba_string{$format};
$string =~ s/_/$prefix/g;
print FILE <<__EOF__;
$string
*dst = ${prefix}pixel;
__EOF__
}
sub output_copycore
{
my $src = shift;
my $dst = shift;
my $modulate = shift;
my $blend = shift;
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my $s = "";
my $d = "";
# Nice and easy...
if ( $src eq $dst && !$modulate && !$blend ) {
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print FILE <<__EOF__;
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*dst = *src;
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return;
}
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if ( $blend ) {
get_rgba("src", $src);
get_rgba("dst", $dst);
$s = "src";
$d = "dst";
} else {
get_rgba("", $src);
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if ( $modulate ) {
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print FILE <<__EOF__;
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if (flags & SDL_COPY_MODULATE_COLOR) {
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${s}R = (${s}R * modulateR) / 255;
${s}G = (${s}G * modulateG) / 255;
${s}B = (${s}B * modulateB) / 255;
}
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if (flags & SDL_COPY_MODULATE_ALPHA) {
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${s}A = (${s}A * modulateA) / 255;
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}
__EOF__
}
if ( $blend ) {
print FILE <<__EOF__;
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if (flags & (SDL_COPY_BLEND|SDL_COPY_ADD)) {
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/* This goes away if we ever use premultiplied alpha */
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if (${s}A < 255) {
${s}R = (${s}R * ${s}A) / 255;
${s}G = (${s}G * ${s}A) / 255;
${s}B = (${s}B * ${s}A) / 255;
}
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switch (flags & (SDL_COPY_MASK|SDL_COPY_BLEND|SDL_COPY_ADD|SDL_COPY_MOD)) {
case SDL_COPY_MASK:
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if (${s}A) {
${d}R = ${s}R;
${d}G = ${s}G;
${d}B = ${s}B;
}
break;
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case SDL_COPY_BLEND:
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${d}R = ${s}R + ((255 - ${s}A) * ${d}R) / 255;
${d}G = ${s}G + ((255 - ${s}A) * ${d}G) / 255;
${d}B = ${s}B + ((255 - ${s}A) * ${d}B) / 255;
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case SDL_COPY_ADD:
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${d}R = ${s}R + ${d}R; if (${d}R > 255) ${d}R = 255;
${d}G = ${s}G + ${d}G; if (${d}G > 255) ${d}G = 255;
${d}B = ${s}B + ${d}B; if (${d}B > 255) ${d}B = 255;
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case SDL_COPY_MOD:
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${d}R = (${s}R * ${d}R) / 255;
${d}G = (${s}G * ${d}G) / 255;
${d}B = (${s}B * ${d}B) / 255;
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break;
}
__EOF__
}
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if ( $blend ) {
set_rgba("dst", $dst);
} else {
set_rgba("", $dst);
}
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}
sub output_copyfunc
{
my $src = shift;
my $dst = shift;
my $modulate = shift;
my $blend = shift;
my $scale = shift;
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output_copyfuncname("static void", $src, $dst, $modulate, $blend, $scale, 1, "\n");
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print FILE <<__EOF__;
{
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const int flags = info->flags;
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__EOF__
if ( $modulate ) {
print FILE <<__EOF__;
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const Uint32 modulateR = info->r;
const Uint32 modulateG = info->g;
const Uint32 modulateB = info->b;
const Uint32 modulateA = info->a;
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__EOF__
}
if ( $blend ) {
print FILE <<__EOF__;
Uint32 srcpixel;
Uint32 srcR, srcG, srcB, srcA;
Uint32 dstpixel;
Uint32 dstR, dstG, dstB, dstA;
__EOF__
} elsif ( $modulate || $src ne $dst ) {
print FILE <<__EOF__;
Uint32 pixel;
Uint32 R, G, B, A;
__EOF__
}
if ( $scale ) {
print FILE <<__EOF__;
int srcy, srcx;
int posy, posx;
int incy, incx;
srcy = 0;
posy = 0;
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incy = (info->src_h << 16) / info->dst_h;
incx = (info->src_w << 16) / info->dst_w;
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while (info->dst_h--) {
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$format_type{$src} *src;
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$format_type{$dst} *dst = ($format_type{$dst} *)info->dst;
int n = info->dst_w;
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srcx = -1;
posx = 0x10000L;
while (posy >= 0x10000L) {
++srcy;
posy -= 0x10000L;
}
while (n--) {
if (posx >= 0x10000L) {
while (posx >= 0x10000L) {
++srcx;
posx -= 0x10000L;
}
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src = ($format_type{$src} *)(info->src + (srcy * info->src_pitch) + (srcx * $format_size{$src}));
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__EOF__
print FILE <<__EOF__;
}
__EOF__
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output_copycore($src, $dst, $modulate, $blend);
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print FILE <<__EOF__;
posx += incx;
++dst;
}
posy += incy;
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info->dst += info->dst_pitch;
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}
__EOF__
} else {
print FILE <<__EOF__;
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while (info->dst_h--) {
$format_type{$src} *src = ($format_type{$src} *)info->src;
$format_type{$dst} *dst = ($format_type{$dst} *)info->dst;
int n = info->dst_w;
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while (n--) {
__EOF__
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output_copycore($src, $dst, $modulate, $blend);
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print FILE <<__EOF__;
++src;
++dst;
}
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info->src += info->src_pitch;
info->dst += info->dst_pitch;
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}
__EOF__
}
print FILE <<__EOF__;
}
__EOF__
}
sub output_copyfunc_h
{
}
sub output_copyinc
{
print FILE <<__EOF__;
#include "SDL_video.h"
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#include "SDL_blit.h"
#include "SDL_blit_auto.h"
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__EOF__
}
sub output_copyfunctable
{
print FILE <<__EOF__;
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SDL_BlitFuncEntry SDL_GeneratedBlitFuncTable[] = {
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__EOF__
for (my $i = 0; $i <= $#src_formats; ++$i) {
my $src = $src_formats[$i];
for (my $j = 0; $j <= $#dst_formats; ++$j) {
my $dst = $dst_formats[$j];
for (my $modulate = 0; $modulate <= 1; ++$modulate) {
for (my $blend = 0; $blend <= 1; ++$blend) {
for (my $scale = 0; $scale <= 1; ++$scale) {
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if ( $modulate || $blend || $scale ) {
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print FILE " { SDL_PIXELFORMAT_$src, SDL_PIXELFORMAT_$dst, ";
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my $flags = "";
my $flag = "";
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if ( $modulate ) {
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$flag = "SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA";
if ( $flags eq "" ) {
$flags = $flag;
} else {
$flags = "$flags | $flag";
}
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}
if ( $blend ) {
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$flag = "SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD";
if ( $flags eq "" ) {
$flags = $flag;
} else {
$flags = "$flags | $flag";
}
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}
if ( $scale ) {
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$flag = "SDL_COPY_NEAREST";
if ( $flags eq "" ) {
$flags = $flag;
} else {
$flags = "$flags | $flag";
}
}
if ( $flags eq "" ) {
$flags = "0";
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print FILE "($flags), SDL_CPU_ANY,";
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output_copyfuncname("", $src_formats[$i], $dst_formats[$j], $modulate, $blend, $scale, 0, " },\n");
}
}
}
}
}
}
print FILE <<__EOF__;
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{ 0, 0, 0, 0, NULL }
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};
__EOF__
}
sub output_copyfunc_c
{
my $src = shift;
my $dst = shift;
for (my $modulate = 0; $modulate <= 1; ++$modulate) {
for (my $blend = 0; $blend <= 1; ++$blend) {
for (my $scale = 0; $scale <= 1; ++$scale) {
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if ( $modulate || $blend || $scale ) {
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output_copyfunc($src, $dst, $modulate, $blend, $scale);
}
}
}
}
}
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open_file("SDL_blit_auto.h");
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output_copydefs();
for (my $i = 0; $i <= $#src_formats; ++$i) {
for (my $j = 0; $j <= $#dst_formats; ++$j) {
output_copyfunc_h($src_formats[$i], $dst_formats[$j]);
}
}
print FILE "\n";
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close_file("SDL_blit_auto.h");
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open_file("SDL_blit_auto.c");
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output_copyinc();
for (my $i = 0; $i <= $#src_formats; ++$i) {
for (my $j = 0; $j <= $#dst_formats; ++$j) {
output_copyfunc_c($src_formats[$i], $dst_formats[$j]);
}
}
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output_copyfunctable();
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close_file("SDL_blit_auto.c");