-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#define GL_GLEXT_PROTOTYPES
-#include <GL/gl.h>
-#include <GL/glext.h>
+#include <stdexcept>
+#include <msp/gl/extensions/arb_multitexture.h>
+#include <msp/gl/extensions/arb_vertex_shader.h>
+#include "gl.h"
+#include "misc.h"
#include "texunit.h"
using namespace std;
namespace Msp {
namespace GL {
+vector<TexUnit> TexUnit::units;
+TexUnit *TexUnit::cur_unit = 0;
+
TexUnit::TexUnit():
texture(0)
{ }
bool TexUnit::set_texture(const Texture *tex)
{
- bool result=(tex!=texture);
- texture=tex;
+ bool result = (tex!=texture);
+ texture = tex;
return result;
}
-TexUnit &TexUnit::activate(unsigned n)
+void TexUnit::bind()
{
- if(units.size()<=n)
- units.resize(n+1);
+ if(cur_unit!=this && (cur_unit || index))
+ glActiveTexture(GL_TEXTURE0+index);
+ cur_unit = this;
+}
- glActiveTextureARB(GL_TEXTURE0+n);
- cur_unit=&units[n];
+unsigned TexUnit::get_n_units()
+{
+ static int count = -1;
+ if(count<0)
+ {
+ if(ARB_vertex_shader)
+ count = get_i(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS);
+ else if(ARB_multitexture)
+ count = get_i(GL_MAX_TEXTURE_UNITS);
+ else
+ count = 1;
+ }
+ return count;
+}
+
+TexUnit &TexUnit::get_unit(unsigned n)
+{
+ if(n>0)
+ static Require _req(ARB_multitexture);
+ if(n>=get_n_units())
+ throw out_of_range("TexUnit::get_unit");
+
+ if(units.size()<=n)
+ {
+ unsigned i = units.size();
+ units.resize(n+1, TexUnit());
+ for(; i<units.size(); ++i)
+ units[i].index = i;
+ }
return units[n];
}
TexUnit &TexUnit::current()
{
if(!cur_unit)
- return activate(0);
+ get_unit(0).bind();
return *cur_unit;
}
-vector<TexUnit> TexUnit::units;
-TexUnit *TexUnit::cur_unit=0;
+TexUnit *TexUnit::find_unit(const Texture *tex)
+{
+ for(vector<TexUnit>::iterator i=units.begin(); i!=units.end(); ++i)
+ if(i->texture==tex)
+ return &*i;
+ return 0;
+}
} // namespace GL
} // namespace Msp