The gl.getActiveAttrib method returns some GLSL building variables (e.g. gl_InstanceID, gl_VertexID) as attributes with location == -1, so they need to be filtered out.
Also, to make it easier to use istancing draw without any additional attributes, the setInstancedCount method will automatically set the isInstanced flag depending on the given count value.
gordonnl
commented
2 years ago
The
gl.getActiveAttribmethod returns some GLSL building variables (e.g.gl_InstanceID,gl_VertexID) as attributes with location == -1, so they need to be filtered out. Also, to make it easier to use istancing draw without any additional attributes, thesetInstancedCountmethod will automatically set theisInstancedflag depending on the given count value.