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/* $Id: clip_tmp.h,v 1.5 2000/01/30 00:27:01 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.1
*
* Copyright (C) 1999 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.
*/
/* KW: a clever asm implementation would nestle integer versions
* of the outcode calculation underneath the division. Gcc won't
* do this, strangely enough, so I only do the divide in
* the case where the cliptest passes. This isn't essential,
* and an asm implementation needn't replicate that behaviour.
*/
static GLvector4f * _XFORMAPI TAG(cliptest_points4)( GLvector4f *clip_vec,
GLvector4f *proj_vec,
GLubyte clipMask[],
GLubyte *orMask,
GLubyte *andMask )
{
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)
/* 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; /* no longer required? */
vProj[i][1] = 0;
vProj[i][2] = 0;
vProj[i][3] = 1;
} else {
GLfloat oow = 1.0F / cw;
vProj[i][3] = oow;
vProj[i][0] = cx * oow;
vProj[i][1] = cy * oow;
vProj[i][2] = cz * oow;
}
}
*orMask = tmpOrMask;
*andMask = (GLubyte) (c < count ? 0 : tmpAndMask);
proj_vec->flags |= VEC_SIZE_4;
proj_vec->size = 3;
proj_vec->count = clip_vec->count;
return proj_vec;
}
static GLvector4f * _XFORMAPI TAG(cliptest_points3)( GLvector4f *clip_vec,
GLvector4f *proj_vec,
GLubyte clipMask[],
GLubyte *orMask,
GLubyte *andMask )
{
const GLuint stride = clip_vec->stride;
const GLuint count = clip_vec->count;
const GLfloat *from = (GLfloat *)clip_vec->start;
GLubyte tmpOrMask = *orMask;
GLubyte tmpAndMask = *andMask;
GLuint i;
STRIDE_LOOP {
const GLfloat cx = from[0], cy = from[1], cz = from[2];
GLubyte mask = 0;
if (cx > 1.0) mask |= CLIP_RIGHT_BIT;
else if (cx < -1.0) mask |= CLIP_LEFT_BIT;
if (cy > 1.0) mask |= CLIP_TOP_BIT;
else if (cy < -1.0) mask |= CLIP_BOTTOM_BIT;
if (cz > 1.0) mask |= CLIP_FAR_BIT;
else if (cz < -1.0) mask |= CLIP_NEAR_BIT;
clipMask[i] = mask;
tmpOrMask |= mask;
tmpAndMask &= mask;
}
gl_vector4f_clean_elem(proj_vec, count, 3);
*orMask = tmpOrMask;
*andMask = tmpAndMask;
return clip_vec;
}
static GLvector4f * _XFORMAPI TAG(cliptest_points2)( GLvector4f *clip_vec,
GLvector4f *proj_vec,
GLubyte clipMask[],
GLubyte *orMask,
GLubyte *andMask )
{
const GLuint stride = clip_vec->stride;
const GLuint count = clip_vec->count;
const GLfloat *from = (GLfloat *)clip_vec->start;
GLubyte tmpOrMask = *orMask;
GLubyte tmpAndMask = *andMask;
GLuint i;
STRIDE_LOOP {
const GLfloat cx = from[0], cy = from[1];
GLubyte mask = 0;
if (cx > 1.0) mask |= CLIP_RIGHT_BIT;
else if (cx < -1.0) mask |= CLIP_LEFT_BIT;
if (cy > 1.0) mask |= CLIP_TOP_BIT;
else if (cy < -1.0) mask |= CLIP_BOTTOM_BIT;
clipMask[i] = mask;
tmpOrMask |= mask;
tmpAndMask &= mask;
}
gl_vector4f_clean_elem(proj_vec, count, 3);
*orMask = tmpOrMask;
*andMask = tmpAndMask;
return clip_vec;
}
static void TAG(init_c_cliptest)( void )
{
gl_clip_tab[4] = TAG(cliptest_points4);
gl_clip_tab[3] = TAG(cliptest_points3);
gl_clip_tab[2] = TAG(cliptest_points2);
}
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