From 84b733d9bbe7a466092fd655fa3566633247223b Mon Sep 17 00:00:00 2001
From: Nigel Stewart <nigels@users.sourceforge.net>
Date: Sat, 23 Jan 2016 21:32:55 +1000
Subject: [PATCH] EGL refinements and fixes

---
 auto/Makefile            |  2 ++
 auto/bin/make_str.pl     |  6 +++---
 auto/src/eglew_head.h    |  2 ++
 auto/src/glew_init_egl.c | 39 +++++++++++++++++++++++++++------------
 auto/src/glew_str_glx.c  |  2 +-
 auto/src/glewinfo_glx.c  |  2 +-
 auto/src/glewinfo_head.c |  2 +-
 7 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/auto/Makefile b/auto/Makefile
index 145a33c..d6b35e7 100644
--- a/auto/Makefile
+++ b/auto/Makefile
@@ -280,6 +280,8 @@ $(S.DEST)/glewinfo.c: $(EXT)/.dummy
 	$(BIN)/make_info.pl $(GL_CORE_SPEC) >> $@
 	$(BIN)/make_info.pl $(GL_EXT_SPEC) >> $@
 	echo -e "#if defined(GLEW_EGL)\n" >> $@
+	$(BIN)/make_info.pl $(EGL_CORE_SPEC) >> $@
+	$(BIN)/make_info.pl $(EGL_EXT_SPEC) >> $@
 	echo -e "#elif _WIN32\n" >> $@
 	$(BIN)/make_info.pl $(WGL_EXT_SPEC) >> $@
 	echo -e "#else /* _UNIX */\n" >> $@
diff --git a/auto/bin/make_str.pl b/auto/bin/make_str.pl
index 5b83ef8..6673a80 100755
--- a/auto/bin/make_str.pl
+++ b/auto/bin/make_str.pl
@@ -24,11 +24,11 @@ if (@ARGV)
 	{
 		my ($extname, $exturl, $extstring, $reuse, $types, $tokens, $functions, $exacts) = parse_ext($ext);
 		my $exttype = $extname;
-		$exttype =~ s/(W*?)GL(X*?)_(.*?_)(.*)/$3/;
+		$exttype =~ s/(W?E?)GL(X?)_(.*?_)(.*)/$3/;
 		my $extrem = $extname;
-		$extrem =~ s/(W*?)GL(X*?)_(.*?_)(.*)/$4/;
+		$extrem =~ s/(W?E?)GL(X?)_(.*?_)(.*)/$4/;
 		my $extvar = $extname;
-		$extvar =~ s/(W*)GL(X*)_/$1GL$2EW_/;
+		$extvar =~ s/(W?E?)GL(X?)_/$1GL$2EW_/;
 		if(!($exttype =~ $curexttype))
 		{
 			if(length($curexttype) > 0)
diff --git a/auto/src/eglew_head.h b/auto/src/eglew_head.h
index f0ec663..bb95b1a 100644
--- a/auto/src/eglew_head.h
+++ b/auto/src/eglew_head.h
@@ -66,6 +66,8 @@ typedef khronos_utime_nanoseconds_t EGLuint64NV;
 
 struct EGLClientPixmapHI;
 
+#define EGL_DEFAULT_DISPLAY               ((EGLNativeDisplayType)0)
+
 EGLAPI __eglMustCastToProperFunctionPointerType EGLAPIENTRY eglGetProcAddress (const char *procname);
 
 #ifdef __cplusplus
diff --git a/auto/src/glew_init_egl.c b/auto/src/glew_init_egl.c
index e2e481a..44453c3 100644
--- a/auto/src/glew_init_egl.c
+++ b/auto/src/glew_init_egl.c
@@ -5,27 +5,42 @@ GLboolean eglewGetExtension (const char* name)
   const GLubyte* start;
   const GLubyte* end;
 
-/* TODO */
-/* return _glewSearchExtension(name, start, end); */
-  return GL_FALSE;
+  start = (const GLubyte*) eglQueryString(eglGetDisplay(EGL_DEFAULT_DISPLAY), EGL_EXTENSIONS);
+  if (0 == start) return GL_FALSE;
+  end = start + _glewStrLen(start);
+  return _glewSearchExtension(name, start, end);
 }
 
 GLenum eglewInit ()
 {
-  int major, minor;
+  GLuint dot;
+  GLint major, minor;
+  const GLubyte* version;
   const GLubyte* extStart;
   const GLubyte* extEnd;
 
-  /* initialize flags */
-  EGLEW_VERSION_1_0 = GL_TRUE;
-  EGLEW_VERSION_1_1 = GL_TRUE;
-  EGLEW_VERSION_1_2 = GL_TRUE;
-  EGLEW_VERSION_1_3 = GL_TRUE;
-  EGLEW_VERSION_1_4 = GL_TRUE;
-  EGLEW_VERSION_1_5 = GL_TRUE;
+  /* query EGK version */
+  major = 0;
+  minor = 0;
+  version = (const GLubyte*) eglQueryString(eglGetDisplay(EGL_DEFAULT_DISPLAY), EGL_VERSION);
+  dot = _glewStrCLen(version, '.');
+  if (dot != 0)
+  {
+    major = version[dot-1]-'0';
+    minor = version[dot+1]-'0';
+  }
 
-  /* query EGL version */
+  EGLEW_VERSION_1_5   = ( major > 1 )              || ( major == 1 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
+  EGLEW_VERSION_1_4   = EGLEW_VERSION_1_5 == GL_TRUE || ( major == 1 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
+  EGLEW_VERSION_1_3   = EGLEW_VERSION_1_4 == GL_TRUE || ( major == 1 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
+  EGLEW_VERSION_1_2   = EGLEW_VERSION_1_3 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
+  EGLEW_VERSION_1_1   = EGLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
+  EGLEW_VERSION_1_0   = EGLEW_VERSION_1_1 == GL_TRUE || ( major == 1 && minor >= 0 ) ? GL_TRUE : GL_FALSE;
 
   /* query EGL extension string */
+  extStart = (const GLubyte*) eglQueryString(eglGetDisplay(EGL_DEFAULT_DISPLAY), EGL_EXTENSIONS);
+  if (extStart == 0)
+    extStart = (const GLubyte *)"";
+  extEnd = extStart + _glewStrLen(extStart);
 
   /* initialize extensions */
diff --git a/auto/src/glew_str_glx.c b/auto/src/glew_str_glx.c
index af4f8c6..893d741 100644
--- a/auto/src/glew_str_glx.c
+++ b/auto/src/glew_str_glx.c
@@ -4,7 +4,7 @@
   return ret;
 }
 
-#elif !defined(GLEW_OSMESA) && !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
+#elif !defined(GLEW_OSMESA) && !defined(GLEW_EGL) && !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
 
 GLboolean glxewIsSupported (const char* name)
 {
diff --git a/auto/src/glewinfo_glx.c b/auto/src/glewinfo_glx.c
index ead3051..e60b549 100644
--- a/auto/src/glewinfo_glx.c
+++ b/auto/src/glewinfo_glx.c
@@ -1,6 +1,6 @@
 }
 
-#elif !defined(GLEW_OSMESA) /* _UNIX */
+#elif !defined(GLEW_EGL) && !defined(GLEW_OSMESA) /* _UNIX */
 
 static void glxewInfo ()
 {
diff --git a/auto/src/glewinfo_head.c b/auto/src/glewinfo_head.c
index 6391a72..02089f6 100644
--- a/auto/src/glewinfo_head.c
+++ b/auto/src/glewinfo_head.c
@@ -3,7 +3,7 @@
 #include <string.h>
 #include <GL/glew.h>
 #if defined(GLEW_EGL)
-#include <EGL/egl.h>
+#include <GL/eglew.h>
 #elif defined(GLEW_OSMESA)
 #define GLAPI extern
 #include <GL/osmesa.h>