WorldViz User Forum - geometryshader parameters

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geometryshader parameters

Hi,
I want to use a simple geometry shader. How can I set the GEOMETRY_INPUT_TYPE_ARB, GL_GEOMETRY_OUTPUT_TYPE_ARB and GL_GEOMETRY_VERTICES_OUT_ARB parameters?

Code:

#version 120

 

#extension GL_ARB_geometry_shader4 : enable

 

//input GL_TRIANGLES

//output GL_LINE_STRIP

 

varying in vec4 V[3];

varying in vec3 N[3];

 

uniform float nLength;

 

void createNormal( vec3 V, vec3 N )

{

    gl_Position = gl_ModelViewProjectionMatrix * vec4( V, 1.0f );

    EmitVertex();

 

    gl_Position = gl_ModelViewProjectionMatrix * vec4( V + N * nLength, 1.0f );

    EmitVertex();

 

    EndPrimitive();

}

 

void main()

{

    for ( int i = 0; i < 3; ++i )

    {

        createNormal( V[i].xyz, N[i] );

    }

}

Any idear?

You should be able to use the layout modifier in your geometry shader source to specify these parameters. Example:

Code:

#version 330 compatibility

layout(triangles) in;

layout(triangle_strip, max_vertices=3) out;