Add functions to get ARB or EXT OpenGL functions.

2 files changed, 29 insertions, 7 deletions

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