Geometry shader

Graphics and GPU Programming Programming OpenGL

Started by Forrest2006 June 14, 2007 05:07 AM

4 comments, last by Krohm 16 years, 10 months ago

Forrest2006

130

Author

June 14, 2007 05:07 AM

When I make a teapot by glutSolidTeapot() , OpenGL sends the data to the pipeline in triangles, but if I need to pass the data in primitive : GL_TRIANGLES_ADJACENCY_EXT to be able to use the adjacency information in my Geometry Shader, how would I do that?

Krohm

5,051

June 14, 2007 08:03 AM

I don't think you can ask GLUT to use GS primitives - there's no way it could know all those years have gone by.

Previously "Krohm"

MARS_999

1,627

June 15, 2007 10:58 PM

If you are referring to the SM4.0 GS, you need a 8800 or 2900 card and GLEE/GLEW with the latest extensions.

V-man

813

June 16, 2007 04:29 AM

Quote:Original post by Krohm
I don't think you can ask GLUT to use GS primitives - there's no way it could know all those years have gone by.

:) that's funny

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

Forrest2006

130

Author

June 19, 2007 07:08 AM

Quote:Original post by MARS_999
If you are referring to the SM4.0 GS, you need a 8800 or 2900 card and GLEE/GLEW with the latest extensions.

I have a G80 and have no problems compiling GS programs. I think what I need is a model loader which would send adjacent triangle vertices to the geometry shader.

Krohm

5,051

June 19, 2007 07:21 AM

Quote:Original post by Forrest2006
I have a G80 and have no problems compiling GS programs. I think what I need is a model loader which would send adjacent triangle vertices to the geometry shader.

No, you need less than that. You need to get the parameter to Begin and change it from PRIMITIVE to PRIMITIVE_ADJACENCY_EXT.
Every valid triangle strip will be just ok, it was a specific design decision.

EDIT: ok, not all of them. Most. You know what the extreme cases are, they're in the spec.

Previously "Krohm"

Geometry shader

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