draw   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/libs/external/gl/gl-objects2.xtm

Implementation

(bind-func draw
  (let ((i 0))
    (lambda (vao:VAO* draw_mode:i32 first_element:i32 count:i32 instances:i32)
      ;; (println 'draw: vao draw_mode first_element count)
      (glBindVertexArray (id vao))
      (gl_print_error "Error binding vertex array")
      (dotimes (i 16)
        (if (aref (attribs vao) i)
            (begin ;; (println 'enable-attrib-list i)
              (glEnableVertexAttribArray i))))
      (gl_print_error "Error enablling attrib arrays in VAO!")
      (if (> instances 0)
          (glDrawArraysInstanced draw_mode first_element count instances)
          (glDrawArrays draw_mode first_element count))
      (gl_print_error "Error drawing VAO!")
      (dotimes (i 16)
        (if (aref (attribs vao) i)
            (begin ;; (println 'disable-attrib-list i)
                   (glDisableVertexAttribArray i))))
      (gl_print_error "Error disabling attrib arrays in VAO!")
      ;; (gl_print_error "Error drawing vertex array")
      ;; (println "done drawing vao")
      (glBindVertexArray 0))))


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