geometryshader parameters

[Andy]

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?


#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?

[farshizzo]

You should be able to use the layout modifier in your geometry shader source to specify these parameters. Example:#version 330 compatibility
layout(triangles) in;
layout(triangle_strip, max_vertices=3) out;

[Andy]

thanks, it works :)