acinclude/esd.m4
author Sam Lantinga
Sun, 05 Apr 2020 08:58:47 -0700
changeset 13689 c3055b205671
parent 3342 3da232c5980a
permissions -rw-r--r--
Fixed bug 5015 - SDL_RenderReadPixels on DirectX 11.1 backend seems to be broken

Konrad

It appears that I cannot use SDL_RenderReadPixels on a bound framebuffer (SDL_Texture set as render target) as it simply results in gibberish data. However, drawing that framebuffer into the default target (window surface) does render it correctly. Other backends (OpenGL, software, Direct3D) do work fine.

It looks to me like D3D11_RenderReadPixels just gets the general backbuffer and not the current render target and its backbuffer.

Here is the patch which actually fetches the current render target and its underlying ID3D11Resource which is ID3D11Texture2D.
     1 ##############################################################################
     2 #
     3 # --- esd.m4 ---
     4 #
     5 # Configure paths for ESD
     6 # Manish Singh    98-9-30
     7 # stolen back from Frank Belew
     8 # stolen from Manish Singh
     9 # Shamelessly stolen from Owen Taylor
    10 
    11 dnl AM_PATH_ESD([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
    12 dnl Test for ESD, and define ESD_CFLAGS and ESD_LIBS
    13 dnl
    14 AC_DEFUN([AM_PATH_ESD],
    15 [dnl 
    16 dnl Get the cflags and libraries from the esd-config script
    17 dnl
    18 AC_ARG_WITH(esd-prefix,[  --with-esd-prefix=PFX   Prefix where ESD is installed (optional)],
    19             esd_prefix="$withval", esd_prefix="")
    20 AC_ARG_WITH(esd-exec-prefix,[  --with-esd-exec-prefix=PFX Exec prefix where ESD is installed (optional)],
    21             esd_exec_prefix="$withval", esd_exec_prefix="")
    22 AC_ARG_ENABLE(esdtest, [  --disable-esdtest       Do not try to compile and run a test ESD program],
    23 		    , enable_esdtest=yes)
    24 
    25   if test x$esd_exec_prefix != x ; then
    26      esd_args="$esd_args --exec-prefix=$esd_exec_prefix"
    27      if test x${ESD_CONFIG+set} != xset ; then
    28         ESD_CONFIG=$esd_exec_prefix/bin/esd-config
    29      fi
    30   fi
    31   if test x$esd_prefix != x ; then
    32      esd_args="$esd_args --prefix=$esd_prefix"
    33      if test x${ESD_CONFIG+set} != xset ; then
    34         ESD_CONFIG=$esd_prefix/bin/esd-config
    35      fi
    36   fi
    37 
    38   AC_PATH_PROG(ESD_CONFIG, esd-config, no)
    39   min_esd_version=ifelse([$1], ,0.2.7,$1)
    40   AC_MSG_CHECKING(for ESD - version >= $min_esd_version)
    41   no_esd=""
    42   if test "$ESD_CONFIG" = "no" ; then
    43     no_esd=yes
    44   else
    45     ESD_CFLAGS=`$ESD_CONFIG $esdconf_args --cflags`
    46     ESD_LIBS=`$ESD_CONFIG $esdconf_args --libs`
    47 
    48     esd_major_version=`$ESD_CONFIG $esd_args --version | \
    49            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    50     esd_minor_version=`$ESD_CONFIG $esd_args --version | \
    51            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    52     esd_micro_version=`$ESD_CONFIG $esd_config_args --version | \
    53            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
    54     if test "x$enable_esdtest" = "xyes" ; then
    55       ac_save_CFLAGS="$CFLAGS"
    56       ac_save_LIBS="$LIBS"
    57       CFLAGS="$CFLAGS $ESD_CFLAGS"
    58       LIBS="$LIBS $ESD_LIBS"
    59 dnl
    60 dnl Now check if the installed ESD is sufficiently new. (Also sanity
    61 dnl checks the results of esd-config to some extent
    62 dnl
    63       rm -f conf.esdtest
    64       AC_TRY_RUN([
    65 #include <stdio.h>
    66 #include <stdlib.h>
    67 #include <string.h>
    68 #include <esd.h>
    69 
    70 char*
    71 my_strdup (char *str)
    72 {
    73   char *new_str;
    74   
    75   if (str)
    76     {
    77       new_str = malloc ((strlen (str) + 1) * sizeof(char));
    78       strcpy (new_str, str);
    79     }
    80   else
    81     new_str = NULL;
    82   
    83   return new_str;
    84 }
    85 
    86 int main ()
    87 {
    88   int major, minor, micro;
    89   char *tmp_version;
    90 
    91   system ("touch conf.esdtest");
    92 
    93   /* HP/UX 9 (%@#!) writes to sscanf strings */
    94   tmp_version = my_strdup("$min_esd_version");
    95   if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    96      printf("%s, bad version string\n", "$min_esd_version");
    97      exit(1);
    98    }
    99 
   100    if (($esd_major_version > major) ||
   101       (($esd_major_version == major) && ($esd_minor_version > minor)) ||
   102       (($esd_major_version == major) && ($esd_minor_version == minor) && ($esd_micro_version >= micro)))
   103     {
   104       return 0;
   105     }
   106   else
   107     {
   108       printf("\n*** 'esd-config --version' returned %d.%d.%d, but the minimum version\n", $esd_major_version, $esd_minor_version, $esd_micro_version);
   109       printf("*** of ESD required is %d.%d.%d. If esd-config is correct, then it is\n", major, minor, micro);
   110       printf("*** best to upgrade to the required version.\n");
   111       printf("*** If esd-config was wrong, set the environment variable ESD_CONFIG\n");
   112       printf("*** to point to the correct copy of esd-config, and remove the file\n");
   113       printf("*** config.cache before re-running configure\n");
   114       return 1;
   115     }
   116 }
   117 
   118 ],, no_esd=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
   119        CFLAGS="$ac_save_CFLAGS"
   120        LIBS="$ac_save_LIBS"
   121      fi
   122   fi
   123   if test "x$no_esd" = x ; then
   124      AC_MSG_RESULT(yes)
   125      ifelse([$2], , :, [$2])     
   126   else
   127      AC_MSG_RESULT(no)
   128      if test "$ESD_CONFIG" = "no" ; then
   129        echo "*** The esd-config script installed by ESD could not be found"
   130        echo "*** If ESD was installed in PREFIX, make sure PREFIX/bin is in"
   131        echo "*** your path, or set the ESD_CONFIG environment variable to the"
   132        echo "*** full path to esd-config."
   133      else
   134        if test -f conf.esdtest ; then
   135         :
   136        else
   137           echo "*** Could not run ESD test program, checking why..."
   138           CFLAGS="$CFLAGS $ESD_CFLAGS"
   139           LIBS="$LIBS $ESD_LIBS"
   140           AC_TRY_LINK([
   141 #include <stdio.h>
   142 #include <esd.h>
   143 ],      [ return 0; ],
   144         [ echo "*** The test program compiled, but did not run. This usually means"
   145           echo "*** that the run-time linker is not finding ESD or finding the wrong"
   146           echo "*** version of ESD. If it is not finding ESD, you'll need to set your"
   147           echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
   148           echo "*** to the installed location  Also, make sure you have run ldconfig if that"
   149           echo "*** is required on your system"
   150 	  echo "***"
   151           echo "*** If you have an old version installed, it is best to remove it, although"
   152           echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
   153         [ echo "*** The test program failed to compile or link. See the file config.log for the"
   154           echo "*** exact error that occured. This usually means ESD was incorrectly installed"
   155           echo "*** or that you have moved ESD since it was installed. In the latter case, you"
   156           echo "*** may want to edit the esd-config script: $ESD_CONFIG" ])
   157           CFLAGS="$ac_save_CFLAGS"
   158           LIBS="$ac_save_LIBS"
   159        fi
   160      fi
   161      ESD_CFLAGS=""
   162      ESD_LIBS=""
   163      ifelse([$3], , :, [$3])
   164   fi
   165   AC_SUBST(ESD_CFLAGS)
   166   AC_SUBST(ESD_LIBS)
   167   rm -f conf.esdtest
   168 ])