--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/x11/fg_window_x11_glx.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,264 @@
+/*
+ * fg_window_x11_glx.c
+ *
+ * Window management methods for X11 with GLX
+ *
+ * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
+ * Written by Pawel W. Olszta, <olszta@sourceforge.net>
+ * Copied for Platform code by Evan Felix <karcaw at gmail.com>
+ * Creation date: Thur Feb 2 2012
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#define FREEGLUT_BUILDING_LIB
+#include <GL/freeglut.h>
+#include "fg_internal.h"
+
+/* pushing attribute/value pairs into an array */
+#define ATTRIB(a) attributes[where++]=(a)
+#define ATTRIB_VAL(a,v) {ATTRIB(a); ATTRIB(v);}
+
+/*
+ * Chooses a visual basing on the current display mode settings
+ */
+
+int fghChooseConfig(GLXFBConfig* fbconfig)
+{
+  GLboolean wantIndexedMode = GL_FALSE;
+  int attributes[ 100 ];
+  int where = 0, numAuxBuffers;
+
+  /* First we have to process the display mode settings... */
+  if( fgState.DisplayMode & GLUT_INDEX ) {
+    ATTRIB_VAL( GLX_BUFFER_SIZE, 8 );
+    /*  Buffer size is selected later.  */
+
+    ATTRIB_VAL( GLX_RENDER_TYPE, GLX_COLOR_INDEX_BIT );
+    wantIndexedMode = GL_TRUE;
+  } else {
+    ATTRIB_VAL( GLX_RED_SIZE,   1 );
+    ATTRIB_VAL( GLX_GREEN_SIZE, 1 );
+    ATTRIB_VAL( GLX_BLUE_SIZE,  1 );
+    if( fgState.DisplayMode & GLUT_ALPHA ) {
+      ATTRIB_VAL( GLX_ALPHA_SIZE, 1 );
+    }
+  }
+
+  if( fgState.DisplayMode & GLUT_DOUBLE ) {
+    ATTRIB_VAL( GLX_DOUBLEBUFFER, True );
+  }
+
+  if( fgState.DisplayMode & GLUT_STEREO ) {
+    ATTRIB_VAL( GLX_STEREO, True );
+  }
+
+  if( fgState.DisplayMode & GLUT_DEPTH ) {
+    ATTRIB_VAL( GLX_DEPTH_SIZE, 1 );
+  }
+
+  if( fgState.DisplayMode & GLUT_STENCIL ) {
+    ATTRIB_VAL( GLX_STENCIL_SIZE, 1 );
+  }
+
+  if( fgState.DisplayMode & GLUT_ACCUM ) {
+    ATTRIB_VAL( GLX_ACCUM_RED_SIZE, 1 );
+    ATTRIB_VAL( GLX_ACCUM_GREEN_SIZE, 1 );
+    ATTRIB_VAL( GLX_ACCUM_BLUE_SIZE, 1 );
+    if( fgState.DisplayMode & GLUT_ALPHA ) {
+      ATTRIB_VAL( GLX_ACCUM_ALPHA_SIZE, 1 );
+    }
+  }
+
+  numAuxBuffers = fghNumberOfAuxBuffersRequested();
+  if ( numAuxBuffers > 0 ) {
+    ATTRIB_VAL( GLX_AUX_BUFFERS, numAuxBuffers );
+  }
+
+  if( fgState.DisplayMode & GLUT_SRGB ) {
+    ATTRIB_VAL( GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB, True );
+  }
+
+  if (fgState.DisplayMode & GLUT_MULTISAMPLE) {
+    ATTRIB_VAL(GLX_SAMPLE_BUFFERS, 1);
+    ATTRIB_VAL(GLX_SAMPLES, fgState.SampleNumber);
+  }
+
+  /* Push a terminator at the end of the list */
+  ATTRIB( None );
+
+    {
+        GLXFBConfig * fbconfigArray;  /*  Array of FBConfigs  */
+        int fbconfigArraySize;        /*  Number of FBConfigs in the array  */
+
+
+        /*  Get all FBConfigs that match "attributes".  */
+        fbconfigArray = glXChooseFBConfig( fgDisplay.pDisplay.Display,
+                                           fgDisplay.pDisplay.Screen,
+                                           attributes,
+                                           &fbconfigArraySize );
+
+        if (fbconfigArray != NULL)
+        {
+            int result __fg_unused;  /* Returned by glXGetFBConfigAttrib, not checked. */
+
+
+            if( wantIndexedMode )
+            {
+                /*
+                 * In index mode, we want the largest buffer size, i.e. visual
+                 * depth.  Here, FBConfigs are sorted by increasing buffer size
+                 * first, so FBConfigs with the largest size come last.
+                 */
+
+                int bufferSizeMin, bufferSizeMax;
+
+                /*  Get bufferSizeMin.  */
+                result =
+                  glXGetFBConfigAttrib( fgDisplay.pDisplay.Display,
+                                        fbconfigArray[0],
+                                        GLX_BUFFER_SIZE,
+                                        &bufferSizeMin );
+                /*  Get bufferSizeMax.  */
+                result =
+                  glXGetFBConfigAttrib( fgDisplay.pDisplay.Display,
+                                        fbconfigArray[fbconfigArraySize - 1],
+                                        GLX_BUFFER_SIZE,
+                                        &bufferSizeMax );
+
+                if (bufferSizeMax > bufferSizeMin)
+                {
+                    /* 
+                     * Free and reallocate fbconfigArray, keeping only FBConfigs
+                     * with the largest buffer size.
+                     */
+                    XFree(fbconfigArray);
+
+                    /*  Add buffer size token at the end of the list.  */
+                    where--;
+                    ATTRIB_VAL( GLX_BUFFER_SIZE, bufferSizeMax );
+                    ATTRIB( None );
+
+                    fbconfigArray = glXChooseFBConfig( fgDisplay.pDisplay.Display,
+                                                       fgDisplay.pDisplay.Screen,
+                                                       attributes,
+                                                       &fbconfigArraySize );
+                }
+            }
+
+            *fbconfig = fbconfigArray[0];
+        }
+        else
+        {
+           *fbconfig = NULL;
+	   return 0;
+        }
+	XFree(fbconfigArray);
+
+        return 1;
+    }
+}
+
+static void fghFillContextAttributes( int *attributes ) {
+  int where = 0, contextFlags, contextProfile;
+
+  ATTRIB_VAL( GLX_CONTEXT_MAJOR_VERSION_ARB, fgState.MajorVersion );
+  ATTRIB_VAL( GLX_CONTEXT_MINOR_VERSION_ARB, fgState.MinorVersion );
+
+  contextFlags =
+    fghMapBit( fgState.ContextFlags, GLUT_DEBUG, GLX_CONTEXT_DEBUG_BIT_ARB ) |
+    fghMapBit( fgState.ContextFlags, GLUT_FORWARD_COMPATIBLE, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB );
+  if ( contextFlags != 0 ) {
+    ATTRIB_VAL( GLX_CONTEXT_FLAGS_ARB, contextFlags );
+  }
+
+  contextProfile =
+    fghMapBit( fgState.ContextProfile, GLUT_CORE_PROFILE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB ) |
+    fghMapBit( fgState.ContextProfile, GLUT_COMPATIBILITY_PROFILE, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB );
+  if ( contextProfile != 0 ) {
+    ATTRIB_VAL( GLX_CONTEXT_PROFILE_MASK_ARB, contextProfile );
+  }
+
+  ATTRIB( 0 );
+}
+
+typedef GLXContext (*CreateContextAttribsProc)(Display *dpy, GLXFBConfig config,
+					       GLXContext share_list, Bool direct,
+					       const int *attrib_list);
+
+GLXContext fghCreateNewContext( SFG_Window* window )
+{
+  /* for color model calculation */
+  int menu = ( window->IsMenu && !fgStructure.MenuContext );
+  int index_mode = ( fgState.DisplayMode & GLUT_INDEX );
+
+  /* "classic" context creation */
+  Display *dpy = fgDisplay.pDisplay.Display;
+  GLXFBConfig config = window->Window.pContext.FBConfig;
+  int render_type = ( !menu && index_mode ) ? GLX_COLOR_INDEX_TYPE : GLX_RGBA_TYPE;
+  GLXContext share_list = NULL;
+  Bool direct = ( fgState.DirectContext != GLUT_FORCE_INDIRECT_CONTEXT );
+  GLXContext context;
+
+  /* new context creation */
+  int attributes[9];
+  CreateContextAttribsProc createContextAttribs = (CreateContextAttribsProc) fgPlatformGetProcAddress( "glXCreateContextAttribsARB" );
+ 
+  /* glXCreateContextAttribsARB not found, yet the user has requested the new context creation */
+  if ( !createContextAttribs && !fghIsLegacyContextRequested() ) {
+    fgWarning( "OpenGL >2.1 context requested but glXCreateContextAttribsARB is not available! Falling back to legacy context creation" );
+	fgState.MajorVersion = 2;
+	fgState.MinorVersion = 1;
+  }
+
+  /* If nothing fancy has been required, simply use the old context creation GLX API entry */
+  if ( fghIsLegacyContextRequested() || !createContextAttribs )
+  {
+    context = glXCreateNewContext( dpy, config, render_type, share_list, direct );
+    if ( context == NULL ) {
+      fghContextCreationError();
+    }
+    return context;
+  }
+
+  /* color index mode is not available anymore with OpenGL 3.0 */
+  if ( render_type == GLX_COLOR_INDEX_TYPE ) {
+    fgWarning( "color index mode is deprecated, using RGBA mode" );
+  }
+
+  fghFillContextAttributes( attributes );
+
+  context = createContextAttribs( dpy, config, share_list, direct, attributes );
+  if ( context == NULL ) {
+    fghContextCreationError();
+  }
+  return context;
+}
+
+void fgPlatformSetWindow ( SFG_Window *window )
+{
+    if ( window )
+    {
+        glXMakeContextCurrent(
+            fgDisplay.pDisplay.Display,
+            window->Window.Handle,
+            window->Window.Handle,
+            window->Window.Context
+        );
+    }
+}