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Marc J

Write to Texture3D, gl_Layer problem

4 posts in this topic

Hello,
I have a problem with writing into an other layer than gl_Layer 0, with an 3d Texture attached to my FBO: Here is my code for the texture and FBO generation:
 

glActiveTexture(GL_TEXTURE0);

glGenTextures(1, &tex3DLVRed);
glBindTexture(GL_TEXTURE_3D, tex3DLVRed);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA32F, 32, 32, 32, 0, GL_RGBA, GL_FLOAT, 0);
glBindTexture(GL_TEXTURE_3D, 0);


glGenFramebuffers(1, &fboLightInject);
glBindFramebuffer(GL_FRAMEBUFFER, fboLightInject);

glFramebufferTexture(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,tex3DLVRed,0);
glBindFramebufferEXT(GL_FRAMEBUFFER, 0);

?

?

My display routine looks like:

glUseProgram(lightInjectProgram);
glViewport(0, 0, 32, 32);
glClearColor(0.f, 0.f, 0.f, 0.f);           
glBindFramebuffer(GL_FRAMEBUFFER, fboLightInject);
glBindVertexArray(pointVAO);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDrawArraysInstanced(GL_POINTS,0,1,512*512);
glUseProgram(0);

My geometry shader looks like this:

#version 330
layout(points) in;
layout(points, max_vertices = 1) out;

void main() 
{
	gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
	gl_Layer = 1;
	EmitVertex();
	EndPrimitive();
}

with gl_Layer=0, it works but when I use some other value, for example 1 it does not produce any output. In the Fragment shader I just assign red color for debug purposes.

 

It would be great if anybody comes up with an idea what to try or where my failure is.

I have an example program which works, therefore I am sure that my hardware is ready for this. but the example is such a complex program that I seem to overlook important instructions.

 

Thank you

Edited by MightTower2
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I believe you must enable mipmapping for the texture, by setting the texture parameter GL_GENERATE_MIPMAP to GL_TRUE, but I also recall reading somewhere that using FBOs with mipmapping doesn't work.

 

I would get the texture loaded up by rendering to the FBO, then I would use glGenerateMipmap, which is an extension function:

 

http://www.opengl.org/wiki/GLAPI/glGenerateMipmap

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glDrawArraysInstanced(GL_POINTS,0,1,512*512);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_3D, tex3DLVRed);
glGenerateMipmap(GL_TEXTURE_3D);

You mean to do this?
If so it does not work :(

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Well, according to the documentation, gl_Layer is actually for designating which face of a cubemap to use - which is different.

 

Somehow I confused gl_Layer with sampler2D/3D lod parameter, which allows a fragment shader to specify which texture mipmap to sample from.

 

Can I ask what it is you are trying to achieve through the use of gl_Layer ?

 

http://www.opengl.org/sdk/docs/manglsl/xhtml/gl_Layer.xml

 

You are using glFrameBufferTexture, when there is a glFrameBufferTexture3D. EDIT: apparently the 3D variant is deprecated in favor of the function you are using, but it is still unclear to me what you are trying to accomplish.

Edited by radioteeth
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Yeah,

I am implementing Light Propagation Volumes right now, there I have some 2D Textures which are accumulated into one 3D texture. To do this I have to write into a 3d texture or a 2D texture array which is more or less the same when it comes to the implementation. And for this I need to set gl_Layer to assign to which slice of the 3d texture I want to write.

And yes you are right it is possible to use gl_Layer for cubemaps, but one can use this aswell for 3d textures. I have working and understandable example code right now but I have to adapt it to my program. And then I have to find out where the difference is to my version.

 

If you have another suggestion how to do this please tell me.
 

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