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samrat/gist:f5f25efd0285694204ce6be5a0e5b7f0

Created July 5, 2016 15:48
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arrowhead in a geometry shader
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gistfile1.txt
/* Arrowhead */
float ang = (PI / 6.0) - atan(vDir[0].y, vDir[0].x);
gl_Position = gl_in[0].gl_Position + vec4(vDir[0], 0.0, 0.0) + vec4(-cos(ang)*0.04, sin(ang)*0.04, 0.0, 0.0);
EmitVertex();
gl_Position = gl_in[0].gl_Position + vec4(vDir[0], 0.0, 0.0);
EmitVertex();
ang = -(PI / 6.0) - atan(vDir[0].y, vDir[0].x);
gl_Position = gl_in[0].gl_Position + vec4(vDir[0], 0.0, 0.0) + vec4(-cos(ang)*0.04, sin(ang)*0.04, 0.0, 0.0);
EmitVertex();
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