Write Text to Texture : Mipmap problems

[Klaim]

Hello,

i'm using Eihort 1.4.0, i'll update to the next version once i resolve this problem :

I'm displaying some texts on a texture that is used in the material of a multiple quads mesh.
I write on the texture using this code snipet (that i just updated on the wiki, please check if my modification did'nt change anything but i doubt about that).


Here is the code initializing the texture content :

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//.....
		m_texture = TextureManager::getSingleton().createManual(textureName,"NetRush",TEX_TYPE_2D, 1024, 1024, MIP_UNLIMITED , PF_X8R8G8B8, TU_DYNAMIC_WRITE_ONLY_DISCARDABLE | TU_AUTOMIPMAP);
		
		//Draw the background to the new texture
		m_texture->getBuffer( )->blit( m_backgroundTexture->getBuffer( ));
		
/// some temporary texts
		std::wstring text( L"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Mauris ac mi auctor turpis nonummy tempus. Praesent arcu. Sed vestibulum sapien ac justo. Etiam viverra elit et tortor. Vivamus et lectus ut eros consectetuer condimentum. Donec ullamcorper posuere." );
		for( int i = 0; i < 48 ; ++i)
			text += L"\n> The NetRush Reloaded!! 01001 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		
		//write the test texts on the texture
		WriteTextToTexture( text ,m_texture,Image::Box(0,0,1024,1024),m_font.getPointer(),ColourValue(1.0,1.0,1.0,1.0),'l');
		
				
		// Create the material :
		std::string materialName ( "QuadMat_" + getName() );
		m_material = Ogre::MaterialManager::getSingleton().create( materialName , "NetRush");
		m_material->setSceneBlending( Ogre::SBT_TRANSPARENT_COLOUR );
		TextureUnitState* texUnit =  m_material->getTechnique(0)->getPass(0)->createTextureUnitState( textureName );
		

		// create the entity (from scratch) for this display 
		//m_graphicData = new Ogre::Entity( "CQuad_" + m_name, static_cast< ConsoleDisplayFactory* >(m_type)->getConsoleDisplayMesh()  );
		m_graphicData = scene->createEntity( "ConsoleDisplay_" + getName(), static_cast< ConsoleDisplayFactory* >(getType())->getConsoleDisplayMesh()->getName()  );
		m_graphicData->setVisible( true );
		m_graphicData->setMaterialName( materialName );
		

This works perfectly. I had some problems for updating the mipmaps but adding the automipmap flags on the texture creation did the job.



Now i have another function that is called each time i press a key and that display another text on the same texture. Here is the code :

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// build the text to display...
//...

// draw the background
		m_texture->getBuffer( )->blit( m_backgroundTexture->getBuffer( ));

		// write the result text to the texture (in white)
		
		WriteTextToTexture( textToDisplay ,m_texture,Ogre::Image::Box(0,0,1024,1024), m_font.getPointer(), Ogre::ColourValue(1.0,1.0,1.0,1.0),'l');

But it seem that only the mipmap 0 is updated...

I tried to call WriteTextToTexture two times in the initilization function with two different texts and there is the same problem.

I don't understand why it works the first time and not the other ones. I tried to call material->touch() and material->compile() to make it update the texture mipmaps but it don't seem to work.


Any idea?

[independentCreations]

do you really need mip maps for this texture? maybe u could do with out?

[Klaim]

I'm not sure if i'll keep mipmaping in the end for this texture, but it's not the problem : it should work with mip mapping. It works the first time, why not the other times?

[Klaim]

As the prerformances are verry poor i'll change the technique to display the text .

Anyway i don't understand this mipmapping problem. It could reaveal a problem in the texture automipmap generation but i can't find the bug.

No idea?

[nebukadnezzar]

yes the performance is poor...
since it copies pixel by pixel...

so could gain more performance by using overlays or may be you want to stick with BetaCairo...

[Klaim]

Not if it don't let you display changing texts in 3D and don't let you apply shaders on the display mesh

[DarkStar]

Hi all,

I run into the same mipmap problem. Blitting to a texture or doing some pixel by pixel changes in a texture with mipmaps only takes place in mipmap 0. My hardware has no hardware mipmap generation

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13:26:53: RenderSystem capabilities
13:26:53: -------------------------
13:26:53:  * Hardware generation of mipmaps: no

Ogre generates them in software during startup and uses them correctly for rendering the scene.

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13:26:56: Texture: exit.png: Loading 1 faces(PF_A8R8G8B8,128x128x1) with 7 generated mipmaps from Image. Internal format is PF_A8R8G8B8,128x128x1.

Till now I have not found a way to let Ogre recalculate the mipmaps. I did it once at startup, so there should be a function to do it again ...

Any ideas?

regards

[Elin]

I have tried this piece of code to put text on a sphere, but all I get is that the sphere turn black.

I am new at using ogre, and I am not that familiar with c++, so I can't find the problem, please help?

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Font* font = (Font*) FontManager::getSingleton().getByName("StarWars").getPointer();
TexturePtr texture = TextureManager::getSingleton().createManual("WriteTexture",ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,TEX_TYPE_2D, 512, 512, MIP_UNLIMITED , PF_X8R8G8B8, TU_STATIC|TU_AUTOMIPMAP);
writeToTexture("hello world",texture,Image::Box(25,275,370,500),font,ColourValue(1.0,1.0,1.0,1.0),'c', true);
MaterialPtr mat = MaterialManager::getSingleton().create("SphereMat", ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
  TextureUnitState* t = mat->getTechnique(0)->getPass(0)->createTextureUnitState("WriteTexture");
  
sphereEntity->setMaterialName("SphereMat");

is where I try to put the texture onto the sphere. I don't want to blend the text onto an existing texture, is that why this goes wrong?