X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Ftexturing.cpp;fp=source%2Ftexturing.cpp;h=c30216f139ebbf91e4a7fdcb53021e1fa6cbc39f;hp=d8d178b385c05e54da6d588df0e4866e6da1a460;hb=96e13fc706ba4e1702ff90eb999ee0660278cb0d;hpb=e701721bde143379bb5c5fa4c0326c6b0e8551a4

diff --git a/source/texturing.cpp b/source/texturing.cpp
index d8d178b3..c30216f1 100644
--- a/source/texturing.cpp
+++ b/source/texturing.cpp
@@ -1,3 +1,4 @@
+#include <msp/core/hash.h>
 #include "texture.h"
 #include "texturing.h"
 #include "texunit.h"
@@ -13,6 +14,23 @@ Texturing::~Texturing()
 		unbind();
 }
 
+int Texturing::find_free_unit(const string &name_hint) const
+{
+	unsigned max_unit = TexUnit::get_n_units();
+	// Leave some space for effect textures
+	max_unit -= min(max_unit/4, 8U);
+	unsigned initial_unit = (name_hint.empty() ? 0 : hash32(name_hint)%max_unit);
+	unsigned unit = initial_unit;
+	while(get_attached_texture(unit))
+	{
+		unit = (unit+1)%max_unit;
+		if(unit==initial_unit)
+			return -1;
+	}
+
+	return unit;
+}
+
 void Texturing::attach(unsigned attch, const Texture &tex)
 {
 	set_attachment(attch, &tex);