Render to texture with 1 float x channel

[mattneri]

Since we need to save some additional information we would like to render to a texture using the ECF_A32B32G32R32F color format. In this way we should have a float available for each channel.
I've created the render texture in this way:

Code: Select all

_renderTexture = _videoDriver->addRenderTargetTexture(irr::core::dimension2d<irr::u32>(dimension, dimension),"RTT", irr::video::ECF_A32B32G32R32F); 

My problem is the following: when I try to retrieve the floats by calling _renderTexture.lock() the texture data is using a ECF_A8R8G8B8 color format instead of the A32B32G32R32F
I'm using the OpenGl Driver.
The problem seems to be in the lock method of the class COpenGLTexture that creates an image using the A8R8G8B8 format and returns a pointer to it.

Is this functionality not supported at the moment by the opengl implementation or am I doing something wrong?
Is it supported by the D9x implementation?

[hendu]

Not implemented.

[mattneri]

even by the directx implementation?

[hendu]

I don't know, I only use GL. Code looks like it may work.

[mattneri]

Thanks hendu.
Yes with directx seems working fine.

[CuteAlien]

Yeah, I also just took a quick look and CD3D9Texture doesn't hardcode A8R8G8B8. Unfortunately no idea why OpenGL implementation does.

[Nadro]

Sorry, but I also don't know why we force ARGB8. Even in OGL ES2 we don't force this format.

[REDDemon]

Do CImage allow reading writing "float" pixel values?