TexUnit's constructor shouldn't be public

[libs/gl.git] / source / texunit.cpp

diff --git a/source/texunit.cpp b/source/texunit.cpp
index 4d5ff81a297dc9f4d3b1f5dfb564111a3257ecbb..fd36a4f15b5e77b7455af08ed4133f6e578c8c44 100644 (file)
--- a/source/texunit.cpp
+++ b/source/texunit.cpp
@@ -1,14 +1,9 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007-2008  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include "extension.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"
-#include "version_1_3.h"
 
 using namespace std;
 
@@ -21,7 +16,9 @@ TexUnit *TexUnit::cur_unit = 0;
 TexUnit::TexUnit():
        texture(0),
        texenv(0)
-{ }
+{
+       fill(texgen, texgen+4, static_cast<const TexGen *>(0));
+}
 
 bool TexUnit::set_texture(const Texture *tex)
 {
@@ -37,32 +34,58 @@ bool TexUnit::set_texenv(const TexEnv *env)
        return result;
 }
 
+bool TexUnit::set_texgen(unsigned i, const TexGen *gen)
+{
+       if(i>=4)
+               throw out_of_range("TexUnit::set_texgen");
+       bool result = (texgen[i]!=gen);
+       texgen[i] = gen;
+       return result;
+}
+
+const TexGen *TexUnit::get_texgen(unsigned i)
+{
+       if(i>=4)
+               throw out_of_range("TexUnit::get_texgen");
+       return texgen[i];
+}
+
+void TexUnit::bind()
+{
+       if(cur_unit!=this && (cur_unit || index))
+               glActiveTexture(GL_TEXTURE0+index);
+       cur_unit = this;
+}
+
 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);
+               if(ARB_vertex_shader)
+                       count = get_i(GL_MAX_TEXTURE_IMAGE_UNITS);
+               else if(ARB_multitexture)
+                       count = get_i(GL_MAX_TEXTURE_UNITS);
                else
                        count = 1;
        }
        return count;
 }
 
-TexUnit &TexUnit::activate(unsigned n)
+TexUnit &TexUnit::get_unit(unsigned n)
 {
+       if(n>0)
+               static Require _req(ARB_multitexture);
        if(n>=get_n_units())
-               throw InvalidParameterValue("Invalid texture unit number");
+               throw out_of_range("TexUnit::get_unit");
 
        if(units.size()<=n)
-               units.resize(n+1);
-
-       if(cur_unit!=&units[n] && (cur_unit || n))
-               glActiveTexture(GL_TEXTURE0+n);
-       cur_unit = &units[n];
+       {
+               unsigned i = units.size();
+               units.resize(n+1, TexUnit());
+               for(; i<units.size(); ++i)
+                       units[i].index = i;
+       }
 
        return units[n];
 }
@@ -70,9 +93,25 @@ TexUnit &TexUnit::activate(unsigned n)
 TexUnit &TexUnit::current()
 {
        if(!cur_unit)
-               return activate(0);
+               get_unit(0).bind();
        return *cur_unit;
 }
 
+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;
+}
+
+TexUnit *TexUnit::find_unit(const TexEnv *env)
+{
+       for(vector<TexUnit>::iterator i=units.begin(); i!=units.end(); ++i)
+               if(i->texenv==env)
+                       return &*i;
+       return 0;
+}
+
 } // namespace GL
 } // namespace Msp