reactos/dll/opengl/mesa/math/m_vector.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  3.5
   4  *
   5  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * New (3.1) transformation code written by Keith Whitwell.
  27  */
  28
  29 #include <precomp.h>
  30
  31 #include "m_vector.h"
  32
  33 /**
  34  * Given a vector [count][4] of floats, set all the [][elt] values
  35  * to 0 (if elt = 0, 1, 2) or 1.0 (if elt = 3).
  36  */
  37 void
  38 _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint count, GLuint elt )
  39 {
  40    static const GLubyte elem_bits[4] = {
  41       VEC_DIRTY_0,
  42       VEC_DIRTY_1,
  43       VEC_DIRTY_2,
  44       VEC_DIRTY_3
  45    };
  46    static const GLfloat clean[4] = { 0, 0, 0, 1 };
  47    const GLfloat v = clean[elt];
  48    GLfloat (*data)[4] = (GLfloat (*)[4])vec->start;
  49    GLuint i;
  50
  51    for (i = 0; i < count; i++)
  52       data[i][elt] = v;
  53
  54    vec->flags &= ~elem_bits[elt];
  55 }
  56
  57
  58 static const GLubyte size_bits[5] = {
  59    0,
  60    VEC_SIZE_1,
  61    VEC_SIZE_2,
  62    VEC_SIZE_3,
  63    VEC_SIZE_4,
  64 };
  65
  66
  67 /**
  68  * Initialize GLvector objects.
  69  * \param v  the vector object to initialize.
  70  * \param flags  bitwise-OR of VEC_* flags
  71  * \param storage  pointer to storage for the vector's data
  72  */
  73 void
  74 _mesa_vector4f_init( GLvector4f *v, GLbitfield flags, GLfloat (*storage)[4] )
  75 {
  76    v->stride = 4 * sizeof(GLfloat);
  77    v->size = 2;   /* may change: 2-4 for vertices and 1-4 for texcoords */
  78    v->data = storage;
  79    v->start = (GLfloat *) storage;
  80    v->count = 0;
  81    v->flags = size_bits[4] | flags;
  82 }
  83
  84
  85 /**
  86  * Initialize GLvector objects and allocate storage.
  87  * \param v  the vector object
  88  * \param flags  bitwise-OR of VEC_* flags
  89  * \param count  number of elements to allocate in vector
  90  * \param alignment  desired memory alignment for the data (in bytes)
  91  */
  92 void
  93 _mesa_vector4f_alloc( GLvector4f *v, GLbitfield flags, GLuint count,
  94                       GLuint alignment )
  95 {
  96    v->stride = 4 * sizeof(GLfloat);
  97    v->size = 2;
  98    v->storage = _mesa_align_malloc( count * 4 * sizeof(GLfloat), alignment );
  99    v->storage_count = count;
 100    v->start = (GLfloat *) v->storage;
 101    v->data = (GLfloat (*)[4]) v->storage;
 102    v->count = 0;
 103    v->flags = size_bits[4] | flags | VEC_MALLOC;
 104 }
 105
 106
 107 /**
 108  * Vector deallocation.  Free whatever memory is pointed to by the
 109  * vector's storage field if the VEC_MALLOC flag is set.
 110  * DO NOT free the GLvector object itself, though.
 111  */
 112 void
 113 _mesa_vector4f_free( GLvector4f *v )
 114 {
 115    if (v->flags & VEC_MALLOC) {
 116       _mesa_align_free( v->storage );
 117       v->data = NULL;
 118       v->start = NULL;
 119       v->storage = NULL;
 120       v->flags &= ~VEC_MALLOC;
 121    }
 122 }
 123
 124
 125 /**
 126  * For debugging
 127  */
 128 void
 129 _mesa_vector4f_print( const GLvector4f *v, const GLubyte *cullmask,
 130                       GLboolean culling )
 131 {
 132    static const GLfloat c[4] = { 0, 0, 0, 1 };
 133    static const char *templates[5] = {
 134       "%d:\t0, 0, 0, 1\n",
 135       "%d:\t%f, 0, 0, 1\n",
 136       "%d:\t%f, %f, 0, 1\n",
 137       "%d:\t%f, %f, %f, 1\n",
 138       "%d:\t%f, %f, %f, %f\n"
 139    };
 140
 141    const char *t = templates[v->size];
 142    GLfloat *d = (GLfloat *)v->data;
 143    GLuint j, i = 0, count;
 144
 145    printf("data-start\n");
 146    for (; d != v->start; STRIDE_F(d, v->stride), i++)
 147       printf(t, i, d[0], d[1], d[2], d[3]);
 148
 149    printf("start-count(%u)\n", v->count);
 150    count = i + v->count;
 151
 152    if (culling) {
 153       for (; i < count; STRIDE_F(d, v->stride), i++)
 154          if (cullmask[i])
 155             printf(t, i, d[0], d[1], d[2], d[3]);
 156    }
 157    else {
 158       for (; i < count; STRIDE_F(d, v->stride), i++)
 159          printf(t, i, d[0], d[1], d[2], d[3]);
 160    }
 161
 162    for (j = v->size; j < 4; j++) {
 163       if ((v->flags & (1<<j)) == 0) {
 164
 165          printf("checking col %u is clean as advertised ", j);
 166
 167          for (i = 0, d = (GLfloat *) v->data;
 168               i < count && d[j] == c[j];
 169               i++, STRIDE_F(d, v->stride)) {
 170             /* no-op */
 171          }
 172
 173          if (i == count)
 174             printf(" --> ok\n");
 175          else
 176             printf(" --> Failed at %u ******\n", i);
 177       }
 178    }
 179 }