gl_tex_width_rect   xtlang


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

Implementation

;; get texture-width
;; for TEXTURE_RECTANGLE only!
(bind-func gl_tex_width_rect
  (lambda (tex)
    (glDisable GL_TEXTURE_2D)
    (glEnable GL_TEXTURE_RECTANGLE_ARB)
    (glBindTexture GL_TEXTURE_RECTANGLE_ARB tex)
    (let ((v:|1,i32|* (salloc)))
      (glGetTexLevelParameteriv GL_TEXTURE_RECTANGLE_ARB 0 GL_TEXTURE_WIDTH (cast v))
      (glDisable GL_TEXTURE_RECTANGLE_ARB)
      (glBindTexture GL_TEXTURE_RECTANGLE_ARB 0)
      (aref v 0))))


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