Most likely your geometry shader is broken.
I can try to check it using your code later this afternoon (CET).
Cheers
Sebastian
Hi Sebastian,
SMesserschmidt wrote:
1. Is the shader really set to the correct state set? Try some simple
non-geometry shader to see if it is working in general.
I commented line 29 in the .cpp file that adds the geometry shader to the
program, and a red point was displayed in the centre of the screen, so that's
that.
SMesserschmidt wrote:
2. Are there errors when using the shader? Some drivers don't produce an error
if the passed primitive doesn't match the geometry-shader type.
Check the output of the console and try a less complicated shader to see where
it fails.
The shaders compile and link fine (including the geometry shader) but as I said there is
no output. I tried replacing my current geometry shader with a simpler
"pass-through" shader (code below), which worked and I can now see a red point
in the centre of the window.
Code:
#version 330
layout(points) in;
layout(points) out;
in vec4 vPosition[1];
uniform mat4 ModelviewProjection;
void main()
{
gl_Position = ModelviewProjection * vPosition[0];
EmitVertex();
}
So obviously there is something wrong with either the geometry shader or my C++
code, any ideas?
Cheers,
Ahmed
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