configure: opengl overhaul

Rename config option from "glx" to "opengl", glx will not be the only
option for opengl in near future.  Also switch over to pkg-config for
opengl support detection.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

configure

@@ -309,7 +309,7 @@ rbd=""
 smartcard_nss=""
 libusb=""
 usb_redir=""
-glx=""
+opengl=""
 zlib="yes"
 lzo=""
 snappy=""
@@ -1027,9 +1027,9 @@ for opt do
   ;;
   --enable-vhost-scsi) vhost_scsi="yes"
   ;;
-  --disable-glx) glx="no"
+  --disable-opengl) opengl="no"
   ;;
-  --enable-glx) glx="yes"
+  --enable-opengl) opengl="yes"
   ;;
   --disable-rbd) rbd="no"
   ;;
@@ -3107,23 +3107,18 @@ fi
 libs_softmmu="$libs_softmmu $fdt_libs"
 
 ##########################################
-# GLX probe, used by milkymist-tmu2
-if test "$glx" != "no" ; then
-  glx_libs="-lGL -lX11"
-  cat > $TMPC << EOF
-#include <X11/Xlib.h>
-#include <GL/gl.h>
-#include <GL/glx.h>
-int main(void) { glBegin(0); glXQueryVersion(0,0,0); return 0; }
-EOF
-  if compile_prog "" "-lGL -lX11" ; then
-    glx=yes
+# opengl probe (for sdl2, milkymist-tmu2)
+if test "$opengl" != "no" ; then
+  opengl_pkgs="gl glx"
+  if $pkg_config $opengl_pkgs; then
+    opengl_libs="$($pkg_config --libs $opengl_pkgs) -lX11"
+    opengl=yes
   else
-    if test "$glx" = "yes" ; then
-      feature_not_found "glx" "Install GL devel (e.g. MESA)"
+    if test "$opengl" = "yes" ; then
+      feature_not_found "opengl" "Install GL devel (e.g. MESA)"
     fi
-    glx_libs=
-    glx=no
+    opengl_libs=""
+    opengl=no
   fi
 fi
 
@@ -4390,7 +4385,7 @@ echo "xfsctl support    $xfs"
 echo "nss used          $smartcard_nss"
 echo "libusb            $libusb"
 echo "usb net redir     $usb_redir"
-echo "GLX support       $glx"
+echo "OpenGL support    $opengl"
 echo "libiscsi support  $libiscsi"
 echo "libnfs support    $libnfs"
 echo "build guest agent $guest_agent"
@@ -4756,9 +4751,9 @@ if test "$usb_redir" = "yes" ; then
   echo "CONFIG_USB_REDIR=y" >> $config_host_mak
 fi
 
-if test "$glx" = "yes" ; then
-  echo "CONFIG_GLX=y" >> $config_host_mak
-  echo "GLX_LIBS=$glx_libs" >> $config_host_mak
+if test "$opengl" = "yes" ; then
+  echo "CONFIG_OPENGL=y" >> $config_host_mak
+  echo "OPENGL_LIBS=$opengl_libs" >> $config_host_mak
 fi
 
 if test "$lzo" = "yes" ; then

default-configs/lm32-softmmu.mak

@@ -2,7 +2,7 @@
 
 CONFIG_LM32=y
 CONFIG_MILKYMIST=y
-CONFIG_MILKYMIST_TMU2=$(CONFIG_GLX)
+CONFIG_MILKYMIST_TMU2=$(CONFIG_OPENGL)
 CONFIG_FRAMEBUFFER=y
 CONFIG_PTIMER=y
 CONFIG_PFLASH_CFI01=y

hw/display/Makefile.objs

@@ -20,7 +20,7 @@ common-obj-$(CONFIG_ZAURUS) += tc6393xb.o
 
 ifeq ($(CONFIG_MILKYMIST_TMU2),y)
 common-obj-y += milkymist-tmu2.o
-libs_softmmu += $(GLX_LIBS)
+libs_softmmu += $(OPENGL_LIBS)
 endif
 
 obj-$(CONFIG_OMAP) += omap_dss.o

hw/lm32/milkymist-hw.h

@@ -86,7 +86,7 @@ static inline DeviceState *milkymist_pfpu_create(hwaddr base,
     return dev;
 }
 
-#ifdef CONFIG_GLX
+#ifdef CONFIG_OPENGL
 #include <X11/Xlib.h>
 #include <GL/glx.h>
 static const int glx_fbconfig_attr[] = {
@@ -100,7 +100,7 @@ static const int glx_fbconfig_attr[] = {
 static inline DeviceState *milkymist_tmu2_create(hwaddr base,
         qemu_irq irq)
 {
-#ifdef CONFIG_GLX
+#ifdef CONFIG_OPENGL
     DeviceState *dev;
     Display *d;
     GLXFBConfig *configs;

include/sysemu/sysemu.h

@@ -114,6 +114,7 @@ extern int graphic_width;
 extern int graphic_height;
 extern int graphic_depth;
 extern DisplayType display_type;
+extern int display_opengl;
 extern const char *keyboard_layout;
 extern int win2k_install_hack;
 extern int alt_grab;

vl.c

@@ -130,6 +130,7 @@ static int data_dir_idx;
 const char *bios_name = NULL;
 enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
 DisplayType display_type = DT_DEFAULT;
+int display_opengl;
 static int display_remote;
 const char* keyboard_layout = NULL;
 ram_addr_t ram_size;