X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftexunit.cpp;h=4d5ff81a297dc9f4d3b1f5dfb564111a3257ecbb;hb=5172d32d67595ea0b70184fadcfcb8e023cccbc8;hp=622599a213d2481acba6707e573286b0d4145f9d;hpb=50e504e2171295d5922ddf87b358e0024db3ce40;p=libs%2Fgl.git

diff --git a/source/texunit.cpp b/source/texunit.cpp
index 622599a2..4d5ff81a 100644
--- a/source/texunit.cpp
+++ b/source/texunit.cpp
@@ -15,36 +15,54 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+vector<TexUnit> TexUnit::units;
+TexUnit *TexUnit::cur_unit = 0;
+
 TexUnit::TexUnit():
-	texture(0)
-{
-}
+	texture(0),
+	texenv(0)
+{ }
 
 bool TexUnit::set_texture(const Texture *tex)
 {
-	bool result=(tex!=texture);
-	texture=tex;
+	bool result = (tex!=texture);
+	texture = tex;
 	return result;
 }
 
 bool TexUnit::set_texenv(const TexEnv *env)
 {
-	bool result=(texenv!=env);
-	texenv=env;
+	bool result = (texenv!=env);
+	texenv = env;
 	return result;
 }
 
+unsigned TexUnit::get_n_units()
+{
+	static int count = -1;
+	if(count<0)
+	{
+		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>=get_n_units())
+		throw InvalidParameterValue("Invalid texture unit number");
+
 	if(units.size()<=n)
 		units.resize(n+1);
 
 	if(cur_unit!=&units[n] && (cur_unit || n))
-	{
-		static RequireVersion _ver(1, 3);
 		glActiveTexture(GL_TEXTURE0+n);
-	}
-	cur_unit=&units[n];
+	cur_unit = &units[n];
 
 	return units[n];
 }
@@ -56,8 +74,5 @@ TexUnit &TexUnit::current()
 	return *cur_unit;
 }
 
-vector<TexUnit> TexUnit::units;
-TexUnit *TexUnit::cur_unit=0;
-
 } // namespace GL
 } // namespace Msp