From 77d621e3041b770f3a5d9fb6c030c9fe882788a7 Mon Sep 17 00:00:00 2001
From: beuc <beuc@7f0cb862-5218-0410-a997-914c9d46530a>
Date: Sat, 21 Apr 2012 16:45:46 +0000
Subject: [PATCH] fg_gl2: Use GLES2 functions directly

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1253 7f0cb862-5218-0410-a997-914c9d46530a
---
 freeglut/freeglut/src/fg_gl2.c | 16 +++++++++-------
 freeglut/freeglut/src/fg_gl2.h | 30 +++++++++++++++++++++++++++---
 2 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/freeglut/freeglut/src/fg_gl2.c b/freeglut/freeglut/src/fg_gl2.c
index 9e31502..b2f1822 100644
--- a/freeglut/freeglut/src/fg_gl2.c
+++ b/freeglut/freeglut/src/fg_gl2.c
@@ -38,17 +38,19 @@ void FGAPIENTRY glutSetVertexAttribNormal(GLint attrib) {
 }
 
 void fgInitGL2() {
+#ifndef GL_ES_VERSION_2_0
     fgState.HasOpenGL20 = 0;
     // TODO: Mesa returns a valid stub function, rather than NULL,
     // when we request a non-existent function
 #define CHECK(func, a) if ((a) == NULL) { fgWarning("fgInitGL2: " func " is NULL"); return; }
-    CHECK("fghGenBuffers", fghGenBuffers = (FGH_PFNGLGENBUFFERSPROC) glutGetProcAddress ("glGenBuffers"));
-    CHECK("fghDeleteBuffers", fghDeleteBuffers = (FGH_PFNGLDELETEBUFFERSPROC) glutGetProcAddress ("glDeleteBuffers"));
-    CHECK("fghBindBuffer", fghBindBuffer = (FGH_PFNGLBINDBUFFERPROC) glutGetProcAddress ("glBindBuffer"));
-    CHECK("fghBufferData", fghBufferData = (FGH_PFNGLBUFFERDATAPROC) glutGetProcAddress ("glBufferData"));
-    CHECK("fghVertexAttribPointer", fghVertexAttribPointer = (FGH_PFNGLVERTEXATTRIBPOINTERPROC) glutGetProcAddress ("glVertexAttribPointer"));
-    CHECK("fghEnableVertexAttribArray", fghEnableVertexAttribArray = (FGH_PFNGLENABLEVERTEXATTRIBARRAYPROC) glutGetProcAddress ("glEnableVertexAttribArray"));
-    CHECK("fghDisableVertexAttribArray", fghDisableVertexAttribArray = (FGH_PFNGLDISABLEVERTEXATTRIBARRAYPROC) glutGetProcAddress ("glDisableVertexAttribArray"));
+    CHECK("fghGenBuffers", fghGenBuffers = (FGH_PFNGLGENBUFFERSPROC)glutGetProcAddress("glGenBuffers"));
+    CHECK("fghDeleteBuffers", fghDeleteBuffers = (FGH_PFNGLDELETEBUFFERSPROC)glutGetProcAddress("glDeleteBuffers"));
+    CHECK("fghBindBuffer", fghBindBuffer = (FGH_PFNGLBINDBUFFERPROC)glutGetProcAddress("glBindBuffer"));
+    CHECK("fghBufferData", fghBufferData = (FGH_PFNGLBUFFERDATAPROC)glutGetProcAddress("glBufferData"));
+    CHECK("fghVertexAttribPointer", fghVertexAttribPointer = (FGH_PFNGLVERTEXATTRIBPOINTERPROC)glutGetProcAddress("glVertexAttribPointer"));
+    CHECK("fghEnableVertexAttribArray", fghEnableVertexAttribArray = (FGH_PFNGLENABLEVERTEXATTRIBARRAYPROC)glutGetProcAddress("glEnableVertexAttribArray"));
+    CHECK("fghDisableVertexAttribArray", fghDisableVertexAttribArray = (FGH_PFNGLDISABLEVERTEXATTRIBARRAYPROC)glutGetProcAddress("glDisableVertexAttribArray"));
 #undef CHECK
+#endif
     fgState.HasOpenGL20 = 1;
 }
diff --git a/freeglut/freeglut/src/fg_gl2.h b/freeglut/freeglut/src/fg_gl2.h
index 54076d7..d32f012 100644
--- a/freeglut/freeglut/src/fg_gl2.h
+++ b/freeglut/freeglut/src/fg_gl2.h
@@ -26,9 +26,31 @@
 #ifndef  FG_GL2_H
 #define  FG_GL2_H
 
-#ifndef APIENTRY
-#    define APIENTRY
-#endif
+#include <GL/freeglut.h>
+#include "fg_internal.h"
+
+#ifdef GL_ES_VERSION_2_0
+/* Use existing functions on GLES 2.0 */
+
+#define FGH_ARRAY_BUFFER GL_ARRAY_BUFFER
+#define FGH_STATIC_DRAW GL_STATIC_DRAW
+#define FGH_ELEMENT_ARRAY_BUFFER GL_ELEMENT_ARRAY_BUFFER
+
+#define fghGenBuffers glGenBuffers
+#define fghDeleteBuffers glDeleteBuffers
+#define fghBindBuffer glBindBuffer
+#define fghBufferData glBufferData
+#define fghEnableVertexAttribArray glEnableVertexAttribArray
+#define fghDisableVertexAttribArray glDisableVertexAttribArray
+#define fghVertexAttribPointer glVertexAttribPointer
+
+#else
+/* Load functions dynamically, they are not defined in e.g. win32's
+   OpenGL headers */
+
+#    ifndef APIENTRY
+#        define APIENTRY
+#    endif
 
 /* extension #defines, types and entries, avoiding a dependency on additional
    libraries like GLEW or the GL/glext.h header */
@@ -53,4 +75,6 @@ FGH_PFNGLENABLEVERTEXATTRIBARRAYPROC fghEnableVertexAttribArray;
 FGH_PFNGLDISABLEVERTEXATTRIBARRAYPROC fghDisableVertexAttribArray;
 FGH_PFNGLVERTEXATTRIBPOINTERPROC fghVertexAttribPointer;
 
+#    endif
+
 #endif