Rendering to texture (RTT) in CEGUI - Revision history

Ident: /* Displaying a (RTT) texture inside your GUI using a CEGUI window */

2015-04-27T15:47:24Z

‎Displaying a (RTT) texture inside your GUI using a CEGUI window

Ident: /* Displaying a (RTT) texture inside your GUI using a CEGUI window */

2015-04-27T14:22:59Z

‎Displaying a (RTT) texture inside your GUI using a CEGUI window

Ident: /* Displaying a (RTT) texture inside your GUI using a CEGUI window */

2015-04-27T14:20:58Z

‎Displaying a (RTT) texture inside your GUI using a CEGUI window

Ident: /* Displaying a (RTT) texture inside your GUI using a CEGUI window */

2015-04-27T13:57:33Z

‎Displaying a (RTT) texture inside your GUI using a CEGUI window

Ident: /* Displaying a (RTT) texture inside your GUI using a CEGUI window */

2015-04-26T22:59:36Z

‎Displaying a (RTT) texture inside your GUI using a CEGUI window

Ident: /* Displaying a (RTT) texture inside your GUI using a CEGUI window */

2015-04-26T22:57:43Z

‎Displaying a (RTT) texture inside your GUI using a CEGUI window

Ident at 20:16, 30 March 2015

2015-03-30T20:16:02Z

Ident at 20:15, 30 March 2015

2015-03-30T20:15:39Z

Ident at 17:08, 21 March 2015

2015-03-21T17:08:41Z

Thesheeep: Added possible problems.

2015-03-18T18:44:15Z

Added possible problems.

@@ Line 67: / Line 67: @@
 // Texture coord flipping is necessary due to differences between renderers regarding top or bottom being the origin.
-// In 0.8.5+ you can use the isTexCoordSystemFlipped() function of your specific Renderer (e.g. OpenGLRenderer, not the CEGUI::Renderer)
+// In 0.8.5+ you can use the isTexCoordSystemFlipped() function of your specific Renderer (e.g. CEGUI::OpenGLRenderer, but not CEGUI::Renderer)
-// Starting with 1.0 you can directly call isTexCoordSystemFlipped() for your Renderer*.
+// Starting with 1.0 you can directly call isTexCoordSystemFlipped() for any Renderer instance.
 // In 0.8.4- none of these functions are available directly, in which case you should use isTextureTargetVerticallyFlipped = true for OpenGL (including OpenGL and OpenGL ES) and else =false.
 OgreRenderer* ogreRenderer = static_cast<OgreRenderer*>(ceguiSystem.getRenderer());

@@ Line 67: / Line 67: @@
 // Texture coord flipping is necessary due to differences between renderers regarding top or bottom being the origin.
-// In 0.8.5+ use the isTexCoordSystemFlipped() function of your Renderer (e.g. OpenGLRenderer, not the CEGUI::Renderer) . Starting with 1.0 Release you can directly call isTexCoordSystemFlipped() on your Renderer*.
+// In 0.8.5+ you can use the isTexCoordSystemFlipped() function of your specific Renderer (e.g. OpenGLRenderer, not the CEGUI::Renderer)
-// If none of these funcions are available (0.8.4-) i suggest to assume that the value is true for OpenGL (including OpenGL and OpenGL ES) and false in any other case.
+// Starting with 1.0 you can directly call isTexCoordSystemFlipped() for your Renderer*.
 OgreRenderer* ogreRenderer = static_cast<OgreRenderer*>(ceguiSystem.getRenderer());
 bool isTextureTargetVerticallyFlipped = ogreRenderer->isTexCoordSystemFlipped();

@@ Line 67: / Line 67: @@
 // Texture coord flipping is necessary due to differences between renderers regarding top or bottom being the origin.
-// Use the "isTexCoordSystemFlipped" function of your Renderer (e.g. OpenGLRenderer, not the just CEGUI::Renderer) in 0.8.5+. Starting with 1.0 Release you can directly call isTexCoordSystemFlipped() on your Renderer*.
+// In 0.8.5+ use the isTexCoordSystemFlipped() function of your Renderer (e.g. OpenGLRenderer, not the CEGUI::Renderer) . Starting with 1.0 Release you can directly call isTexCoordSystemFlipped() on your Renderer*.
-bool isTextureTargetVerticallyFlipped = renderTextureTarget->isRenderingInverted();
+// If none of these funcions are available (0.8.4-) i suggest to assume that the value is true for OpenGL (including OpenGL and OpenGL ES) and false in any other case.
 CEGUI::Rectf imageArea;

@@ Line 66: / Line 66: @@
 CEGUI::BasicImage* image = static_cast<CEGUI::BasicImage*>(&CEGUI::ImageManager::getSingleton().create("BasicImage", "MyImageGroup/MyImageName"));
-// Flipping is necessary due to differences between renderers regarding top or bottom being the origin
+// Texture coord flipping is necessary due to differences between renderers regarding top or bottom being the origin.
 bool isTextureTargetVerticallyFlipped = renderTextureTarget->isRenderingInverted();
 CEGUI::Rectf imageArea;

@@ Line 63: / Line 63: @@
 rendererTexture.setOgreTexture(whateverTextureYouWannaUse, false);
-// We create a BasicImage and set the Texture
+// We create a BasicImage (later called BitmapImage)
 CEGUI::BasicImage* image = static_cast<CEGUI::BasicImage*>(&CEGUI::ImageManager::getSingleton().create("BasicImage", "MyImageGroup/MyImageName"));
 // Flipping is necessary due to differences between renderers regarding top or bottom being the origin
@@ Line 76: / Line 75: @@
      imageArea= CEGUI::Rectf(0.0f, 0.0f, textureWidth, textureHeight);
-// This is necessary to define the image's size. Regardless of flipping or not you need to set the size.
+// This is necessary to define the image's size. Regardless of flipping or not you need to set the size. Multiple images can be associated with a single texture.
-image ->setArea(imageArea);
+image->setArea(imageArea);
 // You most likely don't want autoscaling for RTT images. If you display it in stretched-mode inside a button or Generic/Image widget, then this setting does not play a role anyways.
-image ->setAutoScaled(ASM_Disabled);
+image->setAutoScaled(ASM_Disabled);
 </source>

← Older revision		Revision as of 20:16, 30 March 2015
Line 152:		Line 152:
	''The background is not transparent:'' Have a look if everything in your shaders and rendering pipeline is correct. I had the problem that I was re-assigning the texture to the texture unit every frame, which caused the GUI to appear without proper alpha.		''The background is not transparent:'' Have a look if everything in your shaders and rendering pipeline is correct. I had the problem that I was re-assigning the texture to the texture unit every frame, which caused the GUI to appear without proper alpha.

−	[[Category:HowTo]][[Category:~~Tutorial~~]]	+	[[Category:HowTo]][[Category:Tutorials]]

← Older revision		Revision as of 20:15, 30 March 2015
Line 152:		Line 152:
	''The background is not transparent:'' Have a look if everything in your shaders and rendering pipeline is correct. I had the problem that I was re-assigning the texture to the texture unit every frame, which caused the GUI to appear without proper alpha.		''The background is not transparent:'' Have a look if everything in your shaders and rendering pipeline is correct. I had the problem that I was re-assigning the texture to the texture unit every frame, which caused the GUI to appear without proper alpha.

−	[[Category:HowTo]]	+	[[Category:HowTo]][[Category:Tutorial]]

@@ Line 48: / Line 48: @@
 After that you can use the member function to receive whatever render-specific traits you need, such as the textureID in Opengl as an unsigned integer, or an Ogre::Texture*, etc. ...
@@ Line 109: / Line 151: @@
 ''The background is not transparent:'' Have a look if everything in your shaders and rendering pipeline is correct. I had the problem that I was re-assigning the texture to the texture unit every frame, which caused the GUI to appear without proper alpha.
 [[Category:HowTo]]

@@ Line 54: / Line 54: @@
 The following code can be used as an example of how to render a loaded layout directly to an arbitrary Ogre material by replacing on of its texture units with the layout. This obviously only works exactly like that for Ogre, but I guess it is similar for other libraries.
-First of all, we need to load the layout, create our own GuiContext and assign it to the loaded layout as the surface to render to.
+First of all, we need to load the layout, create our own GuiContext and assign the layout to it.
 <source lang="cpp">
@@ Line 94: / Line 94: @@
 </source>
-The only thing remaining is to call render it all whenever you want to update the texture.
+The only thing remaining is to call render it all whenever you want to update the texture:
 <source lang="cpp">
 ogreRenderer->beginRendering();
-textureTarget ->clear();
+textureTarget->clear();
 context->draw();
 ogreRenderer->endRendering();
 </source>
 = Displaying a (RTT) texture inside your GUI using a CEGUI window =