Questions tagged [geometry-shader]

For questions specifically about the Geometry Shader stage in the GPU pipeline.

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1answer
67 views

Opengl geometry shader input point to output point doesn't show any ouput

I am trying a simple passthrough just to get a feel for the geometry shader. I am taking in a single point and trying to output that point from the geometry shader, it works with the vertex and ...
1
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1answer
54 views

draw on cubemap with help of geometry shader each triangle covers each cubemap face (why??)

I want to do some complicated stuff but have problems with my geometry shader / FBO bindings. To hold it as easy as possible I reduced the code to a minimum. If this works, I could continue the hard ...
1
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1answer
87 views

Is it possible to send Texture Buffer to shader dynamically?

I want to send a series of integer to the geometry shader, while the data will be modified every frame. But when I try to retrive the sampleBuffer in geometry shader, it seems to keep output zero. Am ...
2
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1answer
103 views

Vector graphics output from shader program

I’m fairly new to shader programs in general but I have a question concerning vector graphics. I understand that a pixel shader can generate the color information to draw some sort of geometry on ...
1
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1answer
122 views

Generating the end caps of a cylinder using triangle strips for use in a geometry shader

I know how to generate the walls of a cylinder with triangle strips and the caps with triangle fans, but since I am working inside a geometry shader, I can only output triangle strips, so I am kind of ...
1
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1answer
100 views

Issue with declaring inputs to geometry shader?

I am trying to pass vertex attributes from my vertex shader -> geometry shader and then to the fragment shader. Pretty simple program, here is my vertex shader: ...
5
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1answer
1k views

How much should I rely on Geometry shaders in WebGL?

Geometry shaders appear to have been introduced in 3.2, which makes me wonder how common 3.2-enabled cards are, including support for Geometry shaders within WebGL contexts. Will I be cutting out a ...
17
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1answer
2k views

Is there any way to generate primitives in a geometry shader without any input geometry?

A few years ago I tried to implement this GPU Gem in OpenGL to generate 3D procedural terrain using Marching Cubes. The article suggests to implement Marching Cubes in a geometry shader to maximum ...