From 39c957d9929f0aba775c4a07a70b6124bc4b50e6 Mon Sep 17 00:00:00 2001
From: Sylvain Beucler <beuc@beuc.net>
Date: Sat, 31 Mar 2012 20:52:48 +0000
Subject: [PATCH] OpenGL 2.0: add 2 user-defined, per-context vertex
 attributes for coordinates and normals (e.g. for use in
 fg_geometry)

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1221 7f0cb862-5218-0410-a997-914c9d46530a
---
 include/GL/freeglut_ext.h |    5 +++++
 src/fg_gl2.c              |   10 ++++++++++
 src/fg_gl2.h              |    1 +
 src/fg_internal.h         |    4 +++-
 src/fg_window.c           |    2 ++
 5 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/GL/freeglut_ext.h b/include/GL/freeglut_ext.h
index 0fda0e2..911f224 100644
--- a/include/GL/freeglut_ext.h
+++ b/include/GL/freeglut_ext.h
@@ -226,6 +226,11 @@ FGAPI void    FGAPIENTRY glutInitContextProfile( int profile );
 FGAPI void    FGAPIENTRY glutInitErrorFunc( void (* vError)( const char *fmt, va_list ap ) );
 FGAPI void    FGAPIENTRY glutInitWarningFunc( void (* vWarning)( const char *fmt, va_list ap ) );
 
+/* OpenGL >= 2.0 support */
+FGAPI void    FGAPIENTRY glutSetVertexAttribCoord3(GLint attrib);
+FGAPI void    FGAPIENTRY glutSetVertexAttribNormal(GLint attrib);
+
+
 /*
  * GLUT API macro definitions -- the display mode definitions
  */
diff --git a/src/fg_gl2.c b/src/fg_gl2.c
index 47913f4..e7dea50 100644
--- a/src/fg_gl2.c
+++ b/src/fg_gl2.c
@@ -27,6 +27,16 @@
 #include "fg_internal.h"
 #include "fg_gl2.h"
 
+void glutSetVertexAttribCoord3(GLint attrib) {
+  if (fgStructure.CurrentWindow != NULL)
+    fgStructure.CurrentWindow->Window.attribute_v_coord = attrib;
+}
+
+void glutSetVertexAttribNormal(GLint attrib) {
+  if (fgStructure.CurrentWindow != NULL)
+    fgStructure.CurrentWindow->Window.attribute_v_normal = attrib;
+}
+
 typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
 typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
 typedef void (APIENTRY *PFNGLBUFFERDATAPROC) (GLenum target, fghGLsizeiptr size, const GLvoid *data, GLenum usage);
diff --git a/src/fg_gl2.h b/src/fg_gl2.h
index 788db43..2450f8d 100644
--- a/src/fg_gl2.h
+++ b/src/fg_gl2.h
@@ -29,6 +29,7 @@
 #ifndef APIENTRY
 #    define APIENTRY
 #endif
+
 typedef ptrdiff_t fghGLsizeiptr;
 typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
 typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
diff --git a/src/fg_internal.h b/src/fg_internal.h
index c7dd53b..da0b44d 100644
--- a/src/fg_internal.h
+++ b/src/fg_internal.h
@@ -319,8 +319,8 @@ struct tagSFG_State
     int              MajorVersion;         /* Major OpenGL context version  */
     int              MinorVersion;         /* Minor OpenGL context version  */
     int              ContextFlags;         /* OpenGL context flags          */
-    int              HasOpenGL20;          /* fgInitGL2 could find all OpenGL 2.0 functions */
     int              ContextProfile;       /* OpenGL context profile        */
+    int              HasOpenGL20;          /* fgInitGL2 could find all OpenGL 2.0 functions */
     FGError          ErrorFunc;            /* User defined error handler    */
     FGWarning        WarningFunc;          /* User defined warning handler  */
 };
@@ -361,6 +361,8 @@ struct tagSFG_Context
 	SFG_PlatformContext pContext;    /* The window's FBConfig (X11) or device context (Windows) */
 
     int             DoubleBuffered;  /* Treat the window as double-buffered */
+    GLint attribute_v_coord;
+    GLint attribute_v_normal;
 };
 
 
diff --git a/src/fg_window.c b/src/fg_window.c
index 06efa03..9a980f8 100644
--- a/src/fg_window.c
+++ b/src/fg_window.c
@@ -145,6 +145,8 @@ void fgOpenWindow( SFG_Window* window, const char* title,
         glReadBuffer ( GL_FRONT );
     }
 #endif
+    window->Window.attribute_v_coord = -1;
+    window->Window.attribute_v_normal = -1;
 }
 
 /*
-- 
1.7.10.4