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/* $Id: m_xform_tmp.h,v 1.1 2003-02-28 11:48:05 pj Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  3.5

 *

 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

/*

 * New (3.1) transformation code written by Keith Whitwell.

 */

/*----------------------------------------------------------------------

 * Begin Keith's new code

 *

 *----------------------------------------------------------------------

 */

/* KW: Fixed stride, now measured in bytes as is the OpenGL array stride.

 */

/* KW: These are now parameterized to produce two versions, one

 *     which transforms all incoming points, and a second which

 *     takes notice of a cullmask array, and only transforms

 *     unculled vertices.

 */

/* KW: 1-vectors can sneak into the texture pipeline via the array

 *     interface.  These functions are here because I want consistant

 *     treatment of the vertex sizes and a lazy strategy for

 *     cleaning unused parts of the vector, and so as not to exclude

 *     them from the vertex array interface.

 *

 *     Under our current analysis of matrices, there is no way that

 *     the product of a matrix and a 1-vector can remain a 1-vector,

 *     with the exception of the identity transform.

 */

/* KW: No longer zero-pad outgoing vectors.  Now that external

 *     vectors can get into the pipeline we cannot ever assume

 *     that there is more to a vector than indicated by its

 *     size.

 */

/* KW: Now uses clipmask and a flag to allow us to skip both/either

 *     cliped and/or culled vertices.

 */

/* GH: Not any more -- it's easier (and faster) to just process the

 *     entire vector.  Clipping and culling are handled further down

 *     the pipe, most often during or after the conversion to some

 *     driver-specific vertex format.

 */

static void _XFORMAPI

TAG(transform_points1_general)( GLvector4f *to_vec,

                                const GLfloat m[16],

                                const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0],  m12 = m[12];

   const GLfloat m1 = m[1],  m13 = m[13];

   const GLfloat m2 = m[2],  m14 = m[14];

   const GLfloat m3 = m[3],  m15 = m[15];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0];

      to[i][0] = m0 * ox + m12;

      to[i][1] = m1 * ox + m13;

      to[i][2] = m2 * ox + m14;

      to[i][3] = m3 * ox + m15;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points1_identity)( GLvector4f *to_vec,

                                 const GLfloat m[16],

                                 const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLuint count = from_vec->count;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint i;

   if (to_vec == from_vec) return;

   STRIDE_LOOP {

      to[i][0] = from[0];

   }

   to_vec->size = 1;

   to_vec->flags |= VEC_SIZE_1;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points1_2d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1];

   const GLfloat m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0];

      to[i][0] = m0 * ox + m12;

      to[i][1] = m1 * ox + m13;

   }

   to_vec->size = 2;

   to_vec->flags |= VEC_SIZE_2;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points1_2d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0];

      to[i][0] = m0 * ox + m12;

      to[i][1] =           m13;

   }

   to_vec->size = 2;

   to_vec->flags |= VEC_SIZE_2;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points1_3d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1], m2 = m[2];

   const GLfloat m12 = m[12], m13 = m[13], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0];

      to[i][0] = m0 * ox + m12;

      to[i][1] = m1 * ox + m13;

      to[i][2] = m2 * ox + m14;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points1_3d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0];

   const GLfloat m12 = m[12], m13 = m[13], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0];

      to[i][0] = m0 * ox           + m12;

      to[i][1] =                     m13;

      to[i][2] =                     m14;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points1_perspective)( GLvector4f *to_vec,

                                    const GLfloat m[16],

                                    const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0];

      to[i][0] = m0 * ox                ;

      to[i][1] =           0            ;

      to[i][2] =                     m14;

      to[i][3] = 0;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

/* 2-vectors, which are a lot more relevant than 1-vectors, are

 * present early in the geometry pipeline and throughout the

 * texture pipeline.

 */

static void _XFORMAPI

TAG(transform_points2_general)( GLvector4f *to_vec,

                                const GLfloat m[16],

                                const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0],  m4 = m[4],  m12 = m[12];

   const GLfloat m1 = m[1],  m5 = m[5],  m13 = m[13];

   const GLfloat m2 = m[2],  m6 = m[6],  m14 = m[14];

   const GLfloat m3 = m[3],  m7 = m[7],  m15 = m[15];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1];

      to[i][0] = m0 * ox + m4 * oy + m12;

      to[i][1] = m1 * ox + m5 * oy + m13;

      to[i][2] = m2 * ox + m6 * oy + m14;

      to[i][3] = m3 * ox + m7 * oy + m15;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points2_identity)( GLvector4f *to_vec,

                                 const GLfloat m[16],

                                 const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   GLuint i;

   if (to_vec == from_vec) return;

   STRIDE_LOOP {

      to[i][0] = from[0];

      to[i][1] = from[1];

   }

   to_vec->size = 2;

   to_vec->flags |= VEC_SIZE_2;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points2_2d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1], m4 = m[4], m5 = m[5];

   const GLfloat m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1];

      to[i][0] = m0 * ox + m4 * oy + m12;

      to[i][1] = m1 * ox + m5 * oy + m13;

   }

   to_vec->size = 2;

   to_vec->flags |= VEC_SIZE_2;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points2_2d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m5 = m[5], m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1];

      to[i][0] = m0 * ox           + m12;

      to[i][1] =           m5 * oy + m13;

   }

   to_vec->size = 2;

   to_vec->flags |= VEC_SIZE_2;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points2_3d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1], m2 = m[2], m4 = m[4], m5 = m[5];

   const GLfloat m6 = m[6], m12 = m[12], m13 = m[13], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1];

      to[i][0] = m0 * ox + m4 * oy + m12;

      to[i][1] = m1 * ox + m5 * oy + m13;

      to[i][2] = m2 * ox + m6 * oy + m14;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

/* I would actually say this was a fairly important function, from

 * a texture transformation point of view.

 */

static void _XFORMAPI

TAG(transform_points2_3d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m5 = m[5];

   const GLfloat m12 = m[12], m13 = m[13], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1];

      to[i][0] = m0 * ox           + m12;

      to[i][1] =           m5 * oy + m13;

      to[i][2] =                     m14;

   }

   if (m14 == 0) {

      to_vec->size = 2;

      to_vec->flags |= VEC_SIZE_2;

   } else {

      to_vec->size = 3;

      to_vec->flags |= VEC_SIZE_3;

   }

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points2_perspective)( GLvector4f *to_vec,

                                    const GLfloat m[16],

                                    const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m5 = m[5], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1];

      to[i][0] = m0 * ox                ;

      to[i][1] =           m5 * oy      ;

      to[i][2] =                     m14;

      to[i][3] = 0;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points3_general)( GLvector4f *to_vec,

                                const GLfloat m[16],

                                const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0],  m4 = m[4],  m8 = m[8],  m12 = m[12];

   const GLfloat m1 = m[1],  m5 = m[5],  m9 = m[9],  m13 = m[13];

   const GLfloat m2 = m[2],  m6 = m[6],  m10 = m[10],  m14 = m[14];

   const GLfloat m3 = m[3],  m7 = m[7],  m11 = m[11],  m15 = m[15];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2];

      to[i][0] = m0 * ox + m4 * oy + m8  * oz + m12;

      to[i][1] = m1 * ox + m5 * oy + m9  * oz + m13;

      to[i][2] = m2 * ox + m6 * oy + m10 * oz + m14;

      to[i][3] = m3 * ox + m7 * oy + m11 * oz + m15;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points3_identity)( GLvector4f *to_vec,

                                 const GLfloat m[16],

                                 const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   GLuint i;

   if (to_vec == from_vec) return;

   STRIDE_LOOP {

      to[i][0] = from[0];

      to[i][1] = from[1];

      to[i][2] = from[2];

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points3_2d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1], m4 = m[4], m5 = m[5];

   const GLfloat m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2];

      to[i][0] = m0 * ox + m4 * oy            + m12       ;

      to[i][1] = m1 * ox + m5 * oy            + m13       ;

      to[i][2] =                   +       oz             ;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points3_2d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m5 = m[5], m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2];

      to[i][0] = m0 * ox                      + m12       ;

      to[i][1] =           m5 * oy            + m13       ;

      to[i][2] =                   +       oz             ;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points3_3d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1], m2 = m[2], m4 = m[4], m5 = m[5];

   const GLfloat m6 = m[6], m8 = m[8], m9 = m[9], m10 = m[10];

   const GLfloat m12 = m[12], m13 = m[13], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2];

      to[i][0] = m0 * ox + m4 * oy +  m8 * oz + m12       ;

      to[i][1] = m1 * ox + m5 * oy +  m9 * oz + m13       ;

      to[i][2] = m2 * ox + m6 * oy + m10 * oz + m14       ;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

/* previously known as ortho...

 */

static void _XFORMAPI

TAG(transform_points3_3d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m5 = m[5];

   const GLfloat m10 = m[10], m12 = m[12], m13 = m[13], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2];

      to[i][0] = m0 * ox                      + m12       ;

      to[i][1] =           m5 * oy            + m13       ;

      to[i][2] =                     m10 * oz + m14       ;

   }

   to_vec->size = 3;

   to_vec->flags |= VEC_SIZE_3;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points3_perspective)( GLvector4f *to_vec,

                                    const GLfloat m[16],

                                    const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m5 = m[5], m8 = m[8], m9 = m[9];

   const GLfloat m10 = m[10], m14 = m[14];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2];

      to[i][0] = m0 * ox           + m8  * oz       ;

      to[i][1] =           m5 * oy + m9  * oz       ;

      to[i][2] =                     m10 * oz + m14 ;

      to[i][3] =                          -oz       ;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points4_general)( GLvector4f *to_vec,

                                const GLfloat m[16],

                                const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0],  m4 = m[4],  m8 = m[8],  m12 = m[12];

   const GLfloat m1 = m[1],  m5 = m[5],  m9 = m[9],  m13 = m[13];

   const GLfloat m2 = m[2],  m6 = m[6],  m10 = m[10],  m14 = m[14];

   const GLfloat m3 = m[3],  m7 = m[7],  m11 = m[11],  m15 = m[15];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2], ow = from[3];

      to[i][0] = m0 * ox + m4 * oy + m8  * oz + m12 * ow;

      to[i][1] = m1 * ox + m5 * oy + m9  * oz + m13 * ow;

      to[i][2] = m2 * ox + m6 * oy + m10 * oz + m14 * ow;

      to[i][3] = m3 * ox + m7 * oy + m11 * oz + m15 * ow;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points4_identity)( GLvector4f *to_vec,

                                 const GLfloat m[16],

                                 const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   GLuint i;

   if (to_vec == from_vec) return;

   STRIDE_LOOP {

      to[i][0] = from[0];

      to[i][1] = from[1];

      to[i][2] = from[2];

      to[i][3] = from[3];

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points4_2d)( GLvector4f *to_vec,

                           const GLfloat m[16],

                           const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;

   GLuint count = from_vec->count;

   const GLfloat m0 = m[0], m1 = m[1], m4 = m[4], m5 = m[5];

   const GLfloat m12 = m[12], m13 = m[13];

   GLuint i;

   STRIDE_LOOP {

      const GLfloat ox = from[0], oy = from[1], oz = from[2], ow = from[3];

      to[i][0] = m0 * ox + m4 * oy            + m12 * ow;

      to[i][1] = m1 * ox + m5 * oy            + m13 * ow;

      to[i][2] =                   +       oz           ;

      to[i][3] =                                      ow;

   }

   to_vec->size = 4;

   to_vec->flags |= VEC_SIZE_4;

   to_vec->count = from_vec->count;

}

static void _XFORMAPI

TAG(transform_points4_2d_no_rot)( GLvector4f *to_vec,

                                  const GLfloat m[16],

                                  const GLvector4f *from_vec )

{

   const GLuint stride = from_vec->stride;

   GLfloat *from = from_vec->start;

   GLfloat (*to)[4] = (GLfloat (*)[4])to_vec->start;