X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftexunit.cpp;h=4d71e3b9492674a3a3e0f1712d6d45d526c679bb;hb=2157e9320c60d561208dfdf6034e9a06781c9f30;hp=a542796548f0ae120bc9037b81bf0e2e3071c0fd;hpb=7e9e15a12fb398798f2719545cc8553354c1e389;p=libs%2Fgl.git

diff --git a/source/texunit.cpp b/source/texunit.cpp
index a5427965..4d71e3b9 100644
--- a/source/texunit.cpp
+++ b/source/texunit.cpp
@@ -1,10 +1,4 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007-2008  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
+#include <stdexcept>
 #include "extension.h"
 #include "gl.h"
 #include "texunit.h"
@@ -41,19 +35,21 @@ unsigned TexUnit::get_n_units()
 {
 	static int count = -1;
 	if(count<0)
-		// XXX Should use GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS since GL 2.0
-		glGetIntegerv(GL_MAX_TEXTURE_UNITS, &count);
+	{
+		if(is_version_at_least(2, 0) || is_supported("ARB_vertex_shader"))
+			glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &count);
+		else if(is_version_at_least(1, 3))
+			glGetIntegerv(GL_MAX_TEXTURE_UNITS, &count);
+		else
+			count = 1;
+	}
 	return count;
 }
 
 TexUnit &TexUnit::activate(unsigned n)
 {
-	if(n>0)
-	{
-		static RequireVersion _ver(1, 3);
-		if(n>=get_n_units())
-			throw InvalidParameterValue("Invalid texture unit number");
-	}
+	if(n>=get_n_units())
+		throw out_of_range("TexUnit::activate");
 
 	if(units.size()<=n)
 		units.resize(n+1);