Hi Kai,
I checked RenderStage::runCameraSetUp() source code, and found that
bufferAttachments only have Texture1D, Texture2D, Texture3D,
TextureCubeMap, TextureRetangle, but without TextureArray, and I don`t
know weather OSG using glFramebufferTextureLayer or glFramebufferTexture
when bind TextureArray, cubeMap and Texture3D, if using
glFramebufferTexture, no layer rendering is available. I will try
Texture3D for layer rendering.
BTW,
shadowCamera->attach(osg::Camera::COLOR_BUFFER0, ta, 0, 0);
shadowCamera->attach(osg::Camera::COLOR_BUFFER1, ta, 0, 1);
shadowCamera->attach(osg::Camera::COLOR_BUFFER2, ta, 0, 2);
does not take effects, each color_buffer only accept the rastered
fragments of primitive in first layer, the other 2 in geometry shader does
not shown.
That seems to prove what I was afraid of. Using layered rendering (
glFramebufferTexture() with complex
texture and GLSL gl_Layer variable ) is bit differently processed in OpenGL
than multiple render targets.
You could probably emulate gl_Layer with custom extra vertex
attribute/varying to store layer. Set the value in geometry shader and pass
along to vertex & fragment shaders for selection of target draw buffer.
But I would rather try to modify OSG to do layered rendering in recommended
way. This way you could post your work and others could benefit as well...
Cheers,
Wojtek
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