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/* $Id: m_vertices.c,v 1.1.1.1 2002/10/22 13:06:29 alanh 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.
*/
#include "glheader.h"
#include "macros.h"
#include "m_vertices.h"
#include "m_xform.h"
#if defined(USE_X86_ASM)
#include "X86/common_x86_asm.h"
#endif
/* The start of a bunch of vertex oriented geometry routines. These
* are expected to support the production of driver-specific fast paths
* for CVA and eventually normal processing.
*
* These have been taken from fxfastpath.c, and are now also used in
* the mga driver.
*
* These should grow to include:
* - choice of 8/16 dword vertices
* - ??
* - use of portable assembly layouts.
*
* More tentatively:
* - more (all?) matrix types
* - more (?) vertex sizes
*
* -- Keith Whitwell.
*/
/* The inline 3dnow code seems to give problems with some peoples
* compiler/binutils.
*/
/* #undef USE_3DNOW_ASM */
#if defined(USE_X86_ASM) && defined(__GNUC__)
#endif
/*
* Transform an array of coordinates by an arbitrary 4x4 matrix.
* Output: f - the results vector [][16]
* Input: m - the 4x4 matrix
* obj - pointer to first 4-component coordinate
* obj_stride - stride in bytes between input coordinates
* count - number of coordinates to transform
*/
static void _PROJAPI transform_v16( GLfloat *f,
const GLfloat *m,
const GLfloat *obj,
GLuint obj_stride,
GLuint count )
{
GLuint i;
for (i = 0; i < count; i++, STRIDE_F(obj, obj_stride), f += 16) {
const GLfloat ox = obj[0], oy = obj[1], oz = obj[2];
f[0] = m[0] * ox + m[4] * oy + m[8] * oz + m[12];
f[1] = m[1] * ox + m[5] * oy + m[9] * oz + m[13];
f[2] = m[2] * ox + m[6] * oy + m[10] * oz + m[14];
f[3] = m[3] * ox + m[7] * oy + m[11] * oz + m[15];
}
}
/*
* Compute the view frustum clipmask for an array of vertices.
* Input: first - pointer to first vertex to process
* (the stride must be 16 floats between coordinates)
* last - pointer to vertex just after the last vertex to process
* Input/output: p_clipOr - the bitwise-OR of all vertex clipmasks
* p_clipAnd - the bitwise-AND of all vertex clipmasks
* Output: clipmask - the clipmask for each vertex
*/
static void _PROJAPI cliptest_v16( GLfloat *firstVertex,
GLfloat *lastVertex,
GLubyte *p_clipOr,
GLubyte *p_clipAnd,
GLubyte *clipmask )
{
GLubyte clipAnd = (GLubyte) ~0;
GLubyte clipOr = 0;
GLfloat *v = firstVertex;
static int i;
i = 0;
for ( ; v != lastVertex; v += 16, clipmask++, i++) {
const GLfloat cx = v[0];
const GLfloat cy = v[1];
const GLfloat cz = v[2];
const GLfloat cw = v[3];
GLubyte mask = 0;
if (cx > cw) mask |= CLIP_RIGHT_BIT;
if (cx < -cw) mask |= CLIP_LEFT_BIT;
if (cy > cw) mask |= CLIP_TOP_BIT;
if (cy < -cw) mask |= CLIP_BOTTOM_BIT;
if (cz > cw) mask |= CLIP_FAR_BIT;
if (cz < -cw) mask |= CLIP_NEAR_BIT;
*clipmask = mask;
clipAnd &= mask;
clipOr |= mask;
}
(*p_clipOr) |= clipOr;
(*p_clipAnd) &= clipAnd;
}
/*
* Project all vertices upto but not including last. Guarenteed to be at
* least one such vertex.
* Input: firstVertex - pointer to first vertex
* lastVertex - pointer to vertex just afte the last to transform
* m - 4x4 matrix, we only look at the scale and translate terms
* stride - stride in bytes between coordinates
*/
static void _PROJAPI project_verts( GLfloat *firstVertex,
GLfloat *lastVertex,
const GLfloat *m,
GLuint stride )
{
const GLfloat sx = m[0], sy = m[5], sz = m[10];
const GLfloat tx = m[12], ty = m[13], tz = m[14];
GLfloat *v;
for (v = firstVertex; v != lastVertex; STRIDE_F(v, stride)) {
const GLfloat oow = 1.0F / v[3];
v[0] = sx * v[0] * oow + tx;
v[1] = sy * v[1] * oow + ty;
v[2] = sz * v[2] * oow + tz;
v[3] = oow;
}
}
/*
* Same as the above function, except only process coordinate [i] if
* clipmask[i] is zero.
*/
static void _PROJAPI project_clipped_verts( GLfloat *firstVertex,
GLfloat *lastVertex,
const GLfloat *m,
GLuint stride,
const GLubyte clipmask[] )
{
const GLfloat sx = m[0], sy = m[5], sz = m[10];
const GLfloat tx = m[12], ty = m[13], tz = m[14];
GLfloat *v;
for (v = firstVertex; v != lastVertex; STRIDE_F(v, stride), clipmask++) {
if (!(*clipmask)) {
const GLfloat oow = 1.0F / v[3];
v[0] = sx * v[0] * oow + tx;
v[1] = sy * v[1] * oow + ty;
v[2] = sz * v[2] * oow + tz;
v[3] = oow;
}
}
}
_mesa_transform_func _mesa_xform_points3_v16_general = 0;
_mesa_cliptest_func _mesa_cliptest_points4_v16 = 0;
_mesa_project_func _mesa_project_v16 = 0;
_mesa_project_clipped_func _mesa_project_clipped_v16 = 0;
void
_math_init_vertices( void )
{
_mesa_xform_points3_v16_general = transform_v16;
_mesa_cliptest_points4_v16 = cliptest_v16;
_mesa_project_v16 = project_verts;
_mesa_project_clipped_v16 = project_clipped_verts;
#if 0
/* GH: Add tests/benchmarks for the vertex asm */
gl_test_all_vertex_functions( "default" );
#endif
#ifdef USE_X86_ASM
_mesa_init_all_x86_vertex_asm();
#endif
}
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