func (s *Shader) initAttribute(name string, att *gl.Uint) {
att_name := gl.GLString(name)
defer gl.GLStringFree(att_name)
att_tmp := gl.GetAttribLocation(s.program, att_name)
if att_tmp == -1 {
fmt.Println("Error in getting attribute ", gl.GoString(att_name))
} else {
*att = gl.Uint(att_tmp)
}
}
// Draw draws the Shape object.
func (shape *Shape) Draw() error {
gl.BindBuffer(gl.ARRAY_BUFFER, shape.vertexBuffer)
vertexAttribLoc := gl.GetAttribLocation(paunchEffect.program, gl.GLString("position"))
gl.VertexAttribPointer(gl.Uint(vertexAttribLoc), 2, gl.FLOAT, gl.FALSE, 0, gl.Offset(nil, 0))
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.EnableVertexAttribArray(gl.Uint(vertexAttribLoc))
gl.DrawArrays(shape.mode, 0, gl.Sizei(shape.size/2))
gl.DisableVertexAttribArray(gl.Uint(vertexAttribLoc))
//gl.DisableVertexAttribArray(gl.Uint(1))
//gl.BindTexture(gl.TEXTURE_2D, 0)
return checkForErrors()
}