Enhance the extension generator to support different APIs

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

diff --git a/source/texenv.cpp b/source/texenv.cpp
index c1585391bdcddc04ce809f25ce767001a046116f..c8af55f85febad1b22c5560efb0c7f688fca405e 100644 (file)
--- a/source/texenv.cpp
+++ b/source/texenv.cpp
@@ -5,45 +5,72 @@ namespace Msp {
 namespace GL {
 
 TexEnv::TexEnv():
-       mode(MODULATE)
+       mode(MODULATE),
+       color(0, 0, 0, 0)
 { }
 
+TexEnv::~TexEnv()
+{
+       if(this!=&default_object())
+       {
+               while(TexUnit *unit = TexUnit::find_unit(this))
+                       unbind_from(unit->get_index());
+       }
+}
+
+const TexEnv &TexEnv::default_object()
+{
+       static TexEnv obj;
+       return obj;
+}
+
+void TexEnv::update_parameter(int mask) const
+{
+       if(TexUnit::current().get_texenv()!=this)
+       {
+               TexUnit *unit = TexUnit::find_unit(this);
+               if(!unit)
+                       return;
+
+               unit->bind();
+       }
+
+       if(mask&MODE)
+               glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, mode);
+       if(mask&COLOR)
+               glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, &color.r);
+}
+
 void TexEnv::set_mode(TexEnvMode m)
 {
        mode = m;
-       if(current()==this)
-               glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, mode);
+       update_parameter(MODE);
 }
 
 void TexEnv::set_color(const Color &c)
 {
        color = c;
-       if(current()==this)
-               glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, &color.r);
+       update_parameter(COLOR);
 }
 
-void TexEnv::bind() const
+void TexEnv::bind_to(unsigned i) const
 {
-       if(TexUnit::current().set_texenv(this))
+       TexUnit &unit = TexUnit::get_unit(i);
+       if(unit.set_texenv(this))
        {
-               glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, mode);
-               glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, &color.r);
+               unit.bind();
+               update_parameter(-1);
        }
 }
 
-const TexEnv *TexEnv::current()
+const TexEnv *TexEnv::current(unsigned i)
 {
-       return TexUnit::current().get_texenv();
+       return TexUnit::get_unit(i).get_texenv();
 }
 
-void TexEnv::unbind()
+void TexEnv::unbind_from(unsigned i)
 {
-       if(TexUnit::current().set_texenv(0))
-       {
-               Color black(0, 0, 0, 0);
-               glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, MODULATE);
-               glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, &black.r);
-       }
+       default_object().bind_to(i);
 }
 
 } // namespace GL