static GLvector4f* _XFORMAPI TAG() cliptest_points4	(	GLvector4f *	clip_vec,
		GLvector4f *	proj_vec,
		GLubyte	clipMask[],
		GLubyte *	orMask,
		GLubyte *	andMask
	)		`[static]`

Definition at line 43 of file m_clip_tmp.h.

Referenced by init_c_cliptest().

{
   const GLuint stride = clip_vec->stride;
   const GLfloat *from = (GLfloat *)clip_vec->start;
   const GLuint count = clip_vec->count;
   GLuint c = 0;
   GLfloat (*vProj)[4] = (GLfloat (*)[4])proj_vec->start;
   GLubyte tmpAndMask = *andMask;
   GLubyte tmpOrMask = *orMask;
   GLuint i;
   STRIDE_LOOP {
      const GLfloat cx = from[0];
      const GLfloat cy = from[1];
      const GLfloat cz = from[2];
      const GLfloat cw = from[3];
#if defined(macintosh) || defined(__powerpc__)
      /* on powerpc cliptest is 17% faster in this way. */
      GLuint mask;
      mask = (((cw < cx) << CLIP_RIGHT_SHIFT));
      mask |= (((cw < -cx) << CLIP_LEFT_SHIFT));
      mask |= (((cw < cy) << CLIP_TOP_SHIFT));
      mask |= (((cw < -cy) << CLIP_BOTTOM_SHIFT));
      mask |= (((cw < cz) << CLIP_FAR_SHIFT));
      mask |= (((cw < -cz) << CLIP_NEAR_SHIFT));
#else /* !defined(macintosh)) */
      GLubyte mask = 0;
      if (-cx + cw < 0) mask |= CLIP_RIGHT_BIT;
      if ( cx + cw < 0) mask |= CLIP_LEFT_BIT;
      if (-cy + cw < 0) mask |= CLIP_TOP_BIT;
      if ( cy + cw < 0) mask |= CLIP_BOTTOM_BIT;
      if (-cz + cw < 0) mask |= CLIP_FAR_BIT;
      if ( cz + cw < 0) mask |= CLIP_NEAR_BIT;
#endif /* defined(macintosh) */

      clipMask[i] = mask;
      if (mask) {
     c++;
     tmpAndMask &= mask;
     tmpOrMask |= mask;
     vProj[i][0] = 0;
     vProj[i][1] = 0;
     vProj[i][2] = 0;
     vProj[i][3] = 1;
      } else {
     GLfloat oow = 1.0F / cw;
     vProj[i][0] = cx * oow;
     vProj[i][1] = cy * oow;
     vProj[i][2] = cz * oow;
     vProj[i][3] = oow;
      }
   }

   *orMask = tmpOrMask;
   *andMask = (GLubyte) (c < count ? 0 : tmpAndMask);

   proj_vec->flags |= VEC_SIZE_4;
   proj_vec->size = 4;
   proj_vec->count = clip_vec->count;
   return proj_vec;
}

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