Changeset 3770 in orxonox.OLD for orxonox/branches/textEngine/src/lib/graphics/graphics_engine.cc

Timestamp:

Apr 10, 2005, 11:52:05 PM (20 years ago)

Author:

bensch

Message:

orxonox/branches/textEngine: textEngine rendering again

File:

• orxonox/branches/textEngine/src/lib/graphics/graphics_engine.cc (modified) (1 diff)

orxonox/branches/textEngine/src/lib/graphics/graphics_engine.cc

@@ -167 +167 @@
 
 
+/**
+   \brief entering 2D Mode
+   
+   this is a GL-Projection-mode, that is orthogonal, for placing the font in fron of everything else
+*/
+void GraphicsEngine::enter2DMode(void)
+{
+  SDL_Surface *screen = SDL_GetVideoSurface();
+  
+  /* Note, there may be other things you need to change,
+     depending on how you have your OpenGL state set up.
+  */
+  glPushAttrib(GL_ENABLE_BIT);
+  glDisable(GL_DEPTH_TEST);
+  glDisable(GL_CULL_FACE);
+  glDisable(GL_LIGHTING);  // will be set back when leaving 2D-mode
+  glEnable(GL_TEXTURE_2D);
+
+  /* This allows alpha blending of 2D textures with the scene */
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  
+  glViewport(0, 0, screen->w, screen->h);
+  
+  glMatrixMode(GL_PROJECTION);
+  glPushMatrix();
+  glLoadIdentity();
+  
+  glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0);
+  
+  glMatrixMode(GL_MODELVIEW);
+  glPushMatrix();
+  glLoadIdentity();
+  
+  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+}
+
+/**
+   \brief leaves the 2DMode again also \see Font::enter2DMode(void)
+*/
+void GraphicsEngine::leave2DMode(void)
+{
+  glMatrixMode(GL_MODELVIEW);
+  glPopMatrix();
+  
+  glMatrixMode(GL_PROJECTION);
+  glPopMatrix();
+  
+  glPopAttrib();
+}