From 18b2da68d0ae157778bab38d6a90f71e5bb95da2 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Sat, 12 Jul 2014 21:17:51 +0300
Subject: Add functions to get ARB or EXT OpenGL functions.

---
 src/graphicsmanager.cpp   | 47 ++++++++++++++++++-----------------------------
 src/render/mglfunctions.h | 22 ++++++++++++++++++++++
 src/render/mglxinit.cpp   | 14 +++++++-------
 3 files changed, 47 insertions(+), 36 deletions(-)

diff --git a/src/graphicsmanager.cpp b/src/graphicsmanager.cpp
index ae7e911de..258c0f9f5 100644
--- a/src/graphicsmanager.cpp
+++ b/src/graphicsmanager.cpp
@@ -911,16 +911,15 @@ void GraphicsManager::initOpenGLFunctions()
     else if (supportExtension("GL_EXT_framebuffer_object"))
     {   // old frame buffer extension
         logger->log1("found GL_EXT_framebuffer_object");
-        assignFunction2(glGenRenderbuffers, "glGenRenderbuffersEXT");
-        assignFunction2(glBindRenderbuffer, "glBindRenderbufferEXT");
-        assignFunction2(glRenderbufferStorage, "glRenderbufferStorageEXT");
-        assignFunction2(glGenFramebuffers, "glGenFramebuffersEXT");
-        assignFunction2(glBindFramebuffer, "glBindFramebufferEXT");
-        assignFunction2(glFramebufferTexture2D, "glFramebufferTexture2DEXT");
-        assignFunction2(glFramebufferRenderbuffer,
-            "glFramebufferRenderbufferEXT");
-        assignFunction2(glDeleteFramebuffers, "glDeleteFramebuffersEXT");
-        assignFunction2(glDeleteRenderbuffers, "glDeleteRenderbuffersEXT");
+        assignFunctionEXT(glGenRenderbuffers);
+        assignFunctionEXT(glBindRenderbuffer);
+        assignFunctionEXT(glRenderbufferStorage);
+        assignFunctionEXT(glGenFramebuffers);
+        assignFunctionEXT(glBindFramebuffer);
+        assignFunctionEXT(glFramebufferTexture2D);
+        assignFunctionEXT(glFramebufferRenderbuffer);
+        assignFunctionEXT(glDeleteFramebuffers);
+        assignFunctionEXT(glDeleteRenderbuffers);
     }
     else
     {   // no frame buffer support
@@ -943,8 +942,8 @@ void GraphicsManager::initOpenGLFunctions()
     else if (supportExtension("GL_ARB_debug_output"))
     {
         logger->log1("found GL_ARB_debug_output");
-        assignFunction2(glDebugMessageControl, "glDebugMessageControlARB");
-        assignFunction2(glDebugMessageCallback, "glDebugMessageCallbackARB");
+        assignFunctionARB(glDebugMessageControl);
+        assignFunctionARB(glDebugMessageCallback);
         mSupportDebug = 1;
     }
     else
@@ -965,14 +964,10 @@ void GraphicsManager::initOpenGLFunctions()
     if (supportExtension("GL_EXT_debug_label"))
     {
         logger->log1("found GL_EXT_debug_label");
-        assignFunction2(glLabelObject, "glLabelObjectEXT");
-        if (!mglLabelObject)
-            assignFunction2(glLabelObject, "glLabelObject");
+        assignFunctionEXT(glLabelObject);
         if (!mglLabelObject)
             assignFunction2(glLabelObject, "glObjectLabel");
-        assignFunction2(glGetObjectLabel, "glGetObjectLabelEXT");
-        if (!mglGetObjectLabel)
-            assignFunction2(glGetObjectLabel, "glGetObjectLabel");
+        assignFunctionEXT(glGetObjectLabel);
     }
     else
     {
@@ -990,15 +985,9 @@ void GraphicsManager::initOpenGLFunctions()
     if (supportExtension("GL_EXT_debug_marker"))
     {
         logger->log1("found GL_EXT_debug_marker");
-        assignFunction2(glInsertEventMarker, "glInsertEventMarkerEXT");
-        if (!mglInsertEventMarker)
-            assignFunction2(glInsertEventMarker, "glInsertEventMarker");
-        assignFunction2(glPushGroupMarker, "glPushGroupMarkerEXT");
-        if (!mglPushGroupMarker)
-            assignFunction2(glPushGroupMarker, "glPushGroupMarker");
-        assignFunction2(glPopGroupMarker, "glPopGroupMarkerEXT");
-        if (!mglPopGroupMarker)
-            assignFunction2(glPopGroupMarker, "glPopGroupMarker");
+        assignFunctionEXT(glInsertEventMarker);
+        assignFunctionEXT(glPushGroupMarker);
+        assignFunctionEXT(glPopGroupMarker);
     }
     else
     {
@@ -1012,7 +1001,7 @@ void GraphicsManager::initOpenGLFunctions()
         assignFunction(glEndQuery);
         assignFunction(glDeleteQueries);
         assignFunction(glGetQueryObjectiv);
-        assignFunction2(glGetQueryObjectui64v, "glGetQueryObjectui64vEXT");
+        assignFunctionEXT(glGetQueryObjectui64v);
     }
     else
     {
@@ -1142,7 +1131,7 @@ void GraphicsManager::initOpenGLFunctions()
     }
 
 #ifdef WIN32
-    assignFunction2(wglGetExtensionsString, "wglGetExtensionsStringARB");
+    assignFunctionARB(wglGetExtensionsString);
 #endif
 }
 
diff --git a/src/render/mglfunctions.h b/src/render/mglfunctions.h
index 569f4aac4..23e3bea6d 100644
--- a/src/render/mglfunctions.h
+++ b/src/render/mglfunctions.h
@@ -45,6 +45,28 @@
             logger->log("assigned function: " #func); \
     }
 
+#define assignFunction3(func, ext) \
+    { \
+        m##func = reinterpret_cast<func##_t>(getFunction(#func#ext)); \
+        if (m##func == nullptr) \
+        { \
+            logger->log("function not found: " #func#ext); \
+            m##func = reinterpret_cast<func##_t>(getFunction(#func)); \
+            if (m##func == nullptr) \
+                logger->log("function not found: " #func); \
+            else \
+                logger->log("assigned function: " #func); \
+        } \
+        else \
+        { \
+            logger->log("assigned function: " #func#ext); \
+        } \
+    }
+
+#define assignFunctionARB(func) assignFunction3(func, ARB)
+
+#define assignFunctionEXT(func) assignFunction3(func, EXT)
+
 #define assignFunction2(func, name) \
     { \
         m##func = reinterpret_cast<func##_t>(getFunction(name)); \
diff --git a/src/render/mglxinit.cpp b/src/render/mglxinit.cpp
index e6763d45e..23c592d8d 100644
--- a/src/render/mglxinit.cpp
+++ b/src/render/mglxinit.cpp
@@ -30,13 +30,13 @@
 
 void Glx::initFunctions()
 {
-    assignFunction2(glXCreateContext, "glXCreateContext");
-    assignFunction2(glXGetCurrentContext, "glXGetCurrentContext");
-    assignFunction2(glXCreateContextAttribs, "glXCreateContextAttribsARB");
-    assignFunction2(glXChooseFBConfig, "glXChooseFBConfig");
-    assignFunction2(glXDestroyContext, "glXDestroyContext");
-    assignFunction2(glXMakeCurrent, "glXMakeCurrent");
-    assignFunction2(glXSwapBuffers, "glXSwapBuffers");
+    assignFunction(glXCreateContext);
+    assignFunction(glXGetCurrentContext);
+    assignFunctionARB(glXCreateContextAttribs);
+    assignFunction(glXChooseFBConfig);
+    assignFunction(glXDestroyContext);
+    assignFunction(glXMakeCurrent);
+    assignFunction(glXSwapBuffers);
 }
 
 #endif
-- 
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