kc3-lang/SDL/src/video/sdlgenblit.pl

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• Hash : 18c4db67
  Author :
  Date : 2023-03-16T09:47:34
  

  Simplify SDL_BLENDMODE_MUL in sdlgenblit.pl

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• src/video/sdlgenblit.pl

• #!/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_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",
      "ARGB8888",
  );
  
  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_ignore_alpha = (
      "RGB888" => "_R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel;",
      "BGR888" => "_B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel;",
      "ARGB8888" => "_R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel;",
      "RGBA8888" => "_R = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _B = (Uint8)(_pixel >> 8);",
      "ABGR8888" => "_B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel;",
      "BGRA8888" => "_B = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _R = (Uint8)(_pixel >> 8);",
  );
  
  my %get_rgba_string = (
      "RGB888" => $get_rgba_string_ignore_alpha{"RGB888"},
      "BGR888" => $get_rgba_string_ignore_alpha{"BGR888"},
      "ARGB8888" => $get_rgba_string_ignore_alpha{"ARGB8888"} . " _A = (Uint8)(_pixel >> 24);",
      "RGBA8888" => $get_rgba_string_ignore_alpha{"RGBA8888"} . " _A = (Uint8)_pixel;",
      "ABGR8888" => $get_rgba_string_ignore_alpha{"ABGR8888"} . " _A = (Uint8)(_pixel >> 24);",
      "BGRA8888" => $get_rgba_string_ignore_alpha{"BGRA8888"} . " _A = (Uint8)_pixel;",
  );
  
  my %set_rgba_string = (
      "RGB888" => "_pixel = (_R << 16) | (_G << 8) | _B;",
      "BGR888" => "_pixel = (_B << 16) | (_G << 8) | _R;",
      "ARGB8888" => "_pixel = (_A << 24) | (_R << 16) | (_G << 8) | _B;",
      "RGBA8888" => "_pixel = (_R << 24) | (_G << 16) | (_B << 8) | _A;",
      "ABGR8888" => "_pixel = (_A << 24) | (_B << 16) | (_G << 8) | _R;",
      "BGRA8888" => "_pixel = (_B << 24) | (_G << 16) | (_R << 8) | _A;",
  );
  
  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 */
  /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2023 Sam Lantinga <slouken\@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../SDL_internal.h"
  
  #if SDL_HAVE_BLIT_AUTO
  
  /* *INDENT-OFF* */ /* clang-format off */
  
  __EOF__
  }
  
  sub close_file {
      my $name = shift;
      print FILE <<__EOF__;
  /* *INDENT-ON* */ /* clang-format on */
  
  #endif /* SDL_HAVE_BLIT_AUTO */
  
  /* 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__;
  extern SDL_BlitFuncEntry SDL_GeneratedBlitFuncTable[];
  __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;
  
      print FILE "$prefix SDL_Blit_${src}_${dst}";
      if ( $modulate ) {
          print FILE "_Modulate";
      }
      if ( $blend ) {
          print FILE "_Blend";
      }
      if ( $scale ) {
          print FILE "_Scale";
      }
      if ( $args ) {
          print FILE "(SDL_BlitInfo *info)";
      }
      print FILE "$suffix";
  }
  
  sub get_rgba
  {
      my $prefix = shift;
      my $format = shift;
      my $ignore_alpha = shift;
  
      my $string;
      if ($ignore_alpha) {
          $string = $get_rgba_string_ignore_alpha{$format};
      } else {
          $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;
      my $is_modulateA_done = shift;
      my $A_is_const_FF = shift;
      my $s = "";
      my $d = "";
      my $dst_has_alpha = ($dst =~ /A/) ? 1 : 0;
      my $src_has_alpha = ($src =~ /A/) ? 1 : 0;
      my $sa = "";
      my $da = "";
  
      if (!$modulate && !$blend) {
          # Nice and easy...
          if ( $src eq $dst ) {
              print FILE <<__EOF__;
              *dst = *src;
  __EOF__
              return;
          }
  
          # Matching color-order
          $sa = $src;
          $sa =~ s/[A8]//g;
          $da = $dst;
          $da =~ s/[A8]//g;
          if ($sa eq $da) {
              if ($dst_has_alpha && $src_has_alpha) {
                  $da = substr $dst, 0, 1;
                  if ($da eq "A") {
                      # RGBA -> ARGB
                      print FILE <<__EOF__;
              pixel = *src;
              pixel = (pixel >> 8) | (pixel << 24);
              *dst = pixel;
  __EOF__
                  } else {
                      # ARGB -> RGBA -- unused
                      print FILE <<__EOF__;
              pixel = *src;
              pixel = (pixel << 8) | A;
              *dst = pixel;
  __EOF__
                  }
              } elsif ($dst_has_alpha) {
                  $da = substr $dst, 0, 1;
                  if ($da eq "A") {
                      # RGB -> ARGB
                      print FILE <<__EOF__;
              pixel = *src;
              pixel |= (A << 24);
              *dst = pixel;
  __EOF__
                  } else {
                      # RGB -> RGBA -- unused
                      print FILE <<__EOF__;
              pixel = *src;
              pixel = (pixel << 8) | A;
              *dst = pixel;
  __EOF__
                  }
              } else {
                  $sa = substr $src, 0, 1;
                  if ($sa eq "A") {
                      # ARGB -> RGB
                      print FILE <<__EOF__;
              pixel = *src;
              pixel &= 0xFFFFFF;
              *dst = pixel;
  __EOF__
                  } else {
                      # RGBA -> RGB
                      print FILE <<__EOF__;
              pixel = *src;
              pixel >>= 8;
              *dst = pixel;
  __EOF__
                  }
              }
              return;
          }
      }
  
      my $ignore_dst_alpha = !$dst_has_alpha && !$blend;
  
      if ( $blend ) {
          get_rgba("src", $src, $ignore_dst_alpha);
          get_rgba("dst", $dst, !$dst_has_alpha);
          $s = "src";
          $d = "dst";
      } else {
          get_rgba("", $src, $ignore_dst_alpha);
      }
  
      if ( $modulate ) {
          print FILE <<__EOF__;
              if (flags & SDL_COPY_MODULATE_COLOR) {
                  ${s}R = (${s}R * modulateR) / 255;
                  ${s}G = (${s}G * modulateG) / 255;
                  ${s}B = (${s}B * modulateB) / 255;
              }
  __EOF__
          if (!$ignore_dst_alpha && !$is_modulateA_done) {
              print FILE <<__EOF__;
              if (flags & SDL_COPY_MODULATE_ALPHA) {
                  ${s}A = (${s}A * modulateA) / 255;
              }
  __EOF__
          }
      }
      if ( $blend ) {
          if (!$A_is_const_FF) {
              print FILE <<__EOF__;
              if (flags & (SDL_COPY_BLEND|SDL_COPY_ADD)) {
                  /* This goes away if we ever use premultiplied alpha */
                  if (${s}A < 255) {
                      ${s}R = (${s}R * ${s}A) / 255;
                      ${s}G = (${s}G * ${s}A) / 255;
                      ${s}B = (${s}B * ${s}A) / 255;
                  }
              }
  __EOF__
          }
          print FILE <<__EOF__;
              switch (flags & (SDL_COPY_BLEND|SDL_COPY_ADD|SDL_COPY_MOD|SDL_COPY_MUL)) {
              case SDL_COPY_BLEND:
  __EOF__
          if ($A_is_const_FF) {
              print FILE <<__EOF__;
                  ${d}R = ${s}R;
                  ${d}G = ${s}G;
                  ${d}B = ${s}B;
  __EOF__
          } else {
              print FILE <<__EOF__;
                  ${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;
  __EOF__
          }
          if ( $dst_has_alpha ) {
              if ($A_is_const_FF) {
                  print FILE <<__EOF__;
                  ${d}A = 0xFF;
  __EOF__
              } else {
                  print FILE <<__EOF__;
                  ${d}A = ${s}A + ((255 - ${s}A) * ${d}A) / 255;
  __EOF__
              }
          }
  
          print FILE <<__EOF__;
                  break;
              case SDL_COPY_ADD:
                  ${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;
                  break;
              case SDL_COPY_MOD:
                  ${d}R = (${s}R * ${d}R) / 255;
                  ${d}G = (${s}G * ${d}G) / 255;
                  ${d}B = (${s}B * ${d}B) / 255;
                  break;
              case SDL_COPY_MUL:
  __EOF__
          if ($A_is_const_FF) {
              print FILE <<__EOF__;
                  ${d}R = (${s}R * ${d}R) / 255;
                  ${d}G = (${s}G * ${d}G) / 255;
                  ${d}B = (${s}B * ${d}B) / 255;
  __EOF__
          } else {
              print FILE <<__EOF__;
                  ${d}R = ((${s}R * ${d}R) + (${d}R * (255 - ${s}A))) / 255; if (${d}R > 255) ${d}R = 255;
                  ${d}G = ((${s}G * ${d}G) + (${d}G * (255 - ${s}A))) / 255; if (${d}G > 255) ${d}G = 255;
                  ${d}B = ((${s}B * ${d}B) + (${d}B * (255 - ${s}A))) / 255; if (${d}B > 255) ${d}B = 255;
  __EOF__
          }
  
          print FILE <<__EOF__;
                  break;
              }
  __EOF__
      }
      if ( $blend ) {
          set_rgba("dst", $dst);
      } else {
          set_rgba("", $dst);
      }
  }
  
  sub output_copyfunc
  {
      my $src = shift;
      my $dst = shift;
      my $modulate = shift;
      my $blend = shift;
      my $scale = shift;
  
      my $dst_has_alpha = ($dst =~ /A/) ? 1 : 0;
      my $ignore_dst_alpha = !$dst_has_alpha && !$blend;
  
      my $src_has_alpha = ($src =~ /A/) ? 1 : 0;
  
      my $is_modulateA_done = 0;
      my $A_is_const_FF = 0;
  
      my $sa = $src;
      my $da = $dst;
      my $matching_colors = 0;
  
      $sa =~ s/[A8]//g;
      $da =~ s/[A8]//g;
      $matching_colors = (!$modulate && !$blend && ($sa eq $da)) ? 1 : 0;
  
      output_copyfuncname("static void", $src, $dst, $modulate, $blend, $scale, 1, "\n");
      print FILE <<__EOF__;
  {
  __EOF__
      if ( $modulate || $blend ) {
          print FILE <<__EOF__;
      const int flags = info->flags;
  __EOF__
      }
      if ( $modulate ) {
          print FILE <<__EOF__;
      const Uint32 modulateR = info->r;
      const Uint32 modulateG = info->g;
      const Uint32 modulateB = info->b;
  __EOF__
          if (!$ignore_dst_alpha) {
              print FILE <<__EOF__;
      const Uint32 modulateA = info->a;
  __EOF__
          }
      }
      if ( $blend ) {
          print FILE <<__EOF__;
      Uint32 srcpixel;
  __EOF__
          if (!$ignore_dst_alpha && !$src_has_alpha) {
              if ($modulate){
                  $is_modulateA_done = 1;
                  print FILE <<__EOF__;
      const Uint32 srcA = (flags & SDL_COPY_MODULATE_ALPHA) ? modulateA : 0xFF;
  __EOF__
              } else {
                  $A_is_const_FF = 1;
              }
              print FILE <<__EOF__;
      Uint32 srcR, srcG, srcB;
  __EOF__
          } else {
              print FILE <<__EOF__;
      Uint32 srcR, srcG, srcB, srcA;
  __EOF__
          }
          print FILE <<__EOF__;
      Uint32 dstpixel;
  __EOF__
          if ($dst_has_alpha) {
              print FILE <<__EOF__;
      Uint32 dstR, dstG, dstB, dstA;
  __EOF__
          } else {
              print FILE <<__EOF__;
      Uint32 dstR, dstG, dstB;
  __EOF__
          }
      } elsif ( $modulate || $src ne $dst ) {
          print FILE <<__EOF__;
      Uint32 pixel;
  __EOF__
          if ( !$ignore_dst_alpha && !$src_has_alpha ) {
              if ( $modulate ) {
                  $is_modulateA_done = 1;
                  print FILE <<__EOF__;
      const Uint32 A = (flags & SDL_COPY_MODULATE_ALPHA) ? modulateA : 0xFF;
  __EOF__
              } else {
                  $A_is_const_FF = 1;
                  print FILE <<__EOF__;
      const Uint32 A = 0xFF;
  __EOF__
              }
              if ( !$matching_colors ) {
                  print FILE <<__EOF__;
      Uint32 R, G, B;
  __EOF__
              }
          } elsif ( !$ignore_dst_alpha ) {
              if ( !$matching_colors ) {
                  print FILE <<__EOF__;
      Uint32 R, G, B, A;
  __EOF__
              }
          } elsif ( !$matching_colors ) {
              print FILE <<__EOF__;
      Uint32 R, G, B;
  __EOF__
          }
      }
      if ( $scale ) {
          print FILE <<__EOF__;
      int srcy, srcx;
      Uint32 posy, posx;
      int incy, incx;
  __EOF__
  
      print FILE <<__EOF__;
  
      incy = (info->src_h << 16) / info->dst_h;
      incx = (info->src_w << 16) / info->dst_w;
      posy = incy / 2;
  
      while (info->dst_h--) {
          $format_type{$src} *src = 0;
          $format_type{$dst} *dst = ($format_type{$dst} *)info->dst;
          int n = info->dst_w;
          posx = incx / 2;
  
          srcy = posy >> 16;
          while (n--) {
              srcx = posx >> 16;
              src = ($format_type{$src} *)(info->src + (srcy * info->src_pitch) + (srcx * $format_size{$src}));
  __EOF__
          print FILE <<__EOF__;
  __EOF__
          output_copycore($src, $dst, $modulate, $blend, $is_modulateA_done, $A_is_const_FF);
          print FILE <<__EOF__;
              posx += incx;
              ++dst;
          }
          posy += incy;
          info->dst += info->dst_pitch;
      }
  __EOF__
      } else {
          print FILE <<__EOF__;
  
      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;
          while (n--) {
  __EOF__
          output_copycore($src, $dst, $modulate, $blend, $is_modulateA_done, $A_is_const_FF);
          print FILE <<__EOF__;
              ++src;
              ++dst;
          }
          info->src += info->src_pitch;
          info->dst += info->dst_pitch;
      }
  __EOF__
      }
      print FILE <<__EOF__;
  }
  
  __EOF__
  }
  
  sub output_copyfunc_h
  {
  }
  
  sub output_copyinc
  {
      print FILE <<__EOF__;
  #include "SDL_video.h"
  #include "SDL_blit.h"
  #include "SDL_blit_auto.h"
  
  __EOF__
  }
  
  sub output_copyfunctable
  {
      print FILE <<__EOF__;
  SDL_BlitFuncEntry SDL_GeneratedBlitFuncTable[] = {
  __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) {
                          if ( $modulate || $blend || $scale ) {
                              print FILE "    { SDL_PIXELFORMAT_$src, SDL_PIXELFORMAT_$dst, ";
                              my $flags = "";
                              my $flag = "";
                              if ( $modulate ) {
                                  $flag = "SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA";
                                  if ( $flags eq "" ) {
                                      $flags = $flag;
                                  } else {
                                      $flags = "$flags | $flag";
                                  }
                              }
                              if ( $blend ) {
                                  $flag = "SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL";
                                  if ( $flags eq "" ) {
                                      $flags = $flag;
                                  } else {
                                      $flags = "$flags | $flag";
                                  }
                              }
                              if ( $scale ) {
                                  $flag = "SDL_COPY_NEAREST";
                                  if ( $flags eq "" ) {
                                      $flags = $flag;
                                  } else {
                                      $flags = "$flags | $flag";
                                  }
                              }
                              if ( $flags eq "" ) {
                                  $flags = "0";
                              }
                              print FILE "($flags), SDL_CPU_ANY,";
                              output_copyfuncname("", $src_formats[$i], $dst_formats[$j], $modulate, $blend, $scale, 0, " },\n");
                          }
                      }
                  }
              }
          }
      }
      print FILE <<__EOF__;
      { 0, 0, 0, 0, NULL }
  };
  
  __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) {
                  if ( $modulate || $blend || $scale ) {
                      output_copyfunc($src, $dst, $modulate, $blend, $scale);
                  }
              }
          }
      }
  }
  
  open_file("SDL_blit_auto.h");
  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";
  close_file("SDL_blit_auto.h");
  
  open_file("SDL_blit_auto.c");
  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]);
      }
  }
  output_copyfunctable();
  close_file("SDL_blit_auto.c");
  

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