src/mesa/math/m_vector.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * New (3.1) transformation code written by Keith Whitwell.
  27  */
  28
  29
  30 #include "main/glheader.h"
  31 #include "main/imports.h"
  32 #include "main/macros.h"
  33
  34 #include "m_vector.h"
  35
  36
  37
  38 /**
  39  * Given a vector [count][4] of floats, set all the [][elt] values
  40  * to 0 (if elt = 0, 1, 2) or 1.0 (if elt = 3).
  41  */
  42 void
  43 _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint count, GLuint elt )
  44 {
  45    static const GLubyte elem_bits[4] = {
  46       VEC_DIRTY_0,
  47       VEC_DIRTY_1,
  48       VEC_DIRTY_2,
  49       VEC_DIRTY_3
  50    };
  51    static const GLfloat clean[4] = { 0, 0, 0, 1 };
  52    const GLfloat v = clean[elt];
  53    GLfloat (*data)[4] = (GLfloat (*)[4])vec->start;
  54    GLuint i;
  55
  56    for (i = 0; i < count; i++)
  57       data[i][elt] = v;
  58
  59    vec->flags &= ~elem_bits[elt];
  60 }
  61
  62
  63 static const GLubyte size_bits[5] = {
  64    0,
  65    VEC_SIZE_1,
  66    VEC_SIZE_2,
  67    VEC_SIZE_3,
  68    VEC_SIZE_4,
  69 };
  70
  71
  72 /**
  73  * Initialize GLvector objects.
  74  * \param v  the vector object to initialize.
  75  * \param flags  bitwise-OR of VEC_* flags
  76  * \param storage  pointer to storage for the vector's data
  77  */
  78 void
  79 _mesa_vector4f_init( GLvector4f *v, GLbitfield flags, GLfloat (*storage)[4] )
  80 {
  81    v->stride = 4 * sizeof(GLfloat);
  82    v->size = 2;   /* may change: 2-4 for vertices and 1-4 for texcoords */
  83    v->data = storage;
  84    v->start = (GLfloat *) storage;
  85    v->count = 0;
  86    v->flags = size_bits[4] | flags;
  87 }
  88
  89
  90 /**
  91  * Initialize GLvector objects and allocate storage.
  92  * \param v  the vector object
  93  * \param flags  bitwise-OR of VEC_* flags
  94  * \param count  number of elements to allocate in vector
  95  * \param alignment  desired memory alignment for the data (in bytes)
  96  */
  97 void
  98 _mesa_vector4f_alloc( GLvector4f *v, GLbitfield flags, GLuint count,
  99                       GLuint alignment )
 100 {
 101    v->stride = 4 * sizeof(GLfloat);
 102    v->size = 2;
 103    v->storage = _mesa_align_malloc( count * 4 * sizeof(GLfloat), alignment );
 104    v->storage_count = count;
 105    v->start = (GLfloat *) v->storage;
 106    v->data = (GLfloat (*)[4]) v->storage;
 107    v->count = 0;
 108    v->flags = size_bits[4] | flags | VEC_MALLOC;
 109 }
 110
 111
 112 /**
 113  * Vector deallocation.  Free whatever memory is pointed to by the
 114  * vector's storage field if the VEC_MALLOC flag is set.
 115  * DO NOT free the GLvector object itself, though.
 116  */
 117 void
 118 _mesa_vector4f_free( GLvector4f *v )
 119 {
 120    if (v->flags & VEC_MALLOC) {
 121       _mesa_align_free( v->storage );
 122       v->data = NULL;
 123       v->start = NULL;
 124       v->storage = NULL;
 125       v->flags &= ~VEC_MALLOC;
 126    }
 127 }
 128
 129
 130 /**
 131  * For debugging
 132  */
 133 void
 134 _mesa_vector4f_print( const GLvector4f *v, const GLubyte *cullmask,
 135                       GLboolean culling )
 136 {
 137    static const GLfloat c[4] = { 0, 0, 0, 1 };
 138    static const char *templates[5] = {
 139       "%d:\t0, 0, 0, 1\n",
 140       "%d:\t%f, 0, 0, 1\n",
 141       "%d:\t%f, %f, 0, 1\n",
 142       "%d:\t%f, %f, %f, 1\n",
 143       "%d:\t%f, %f, %f, %f\n"
 144    };
 145
 146    const char *t = templates[v->size];
 147    GLfloat *d = (GLfloat *)v->data;
 148    GLuint j, i = 0, count;
 149
 150    printf("data-start\n");
 151    for (; d != v->start; STRIDE_F(d, v->stride), i++)
 152       printf(t, i, d[0], d[1], d[2], d[3]);
 153
 154    printf("start-count(%u)\n", v->count);
 155    count = i + v->count;
 156
 157    if (culling) {
 158       for (; i < count; STRIDE_F(d, v->stride), i++)
 159          if (cullmask[i])
 160             printf(t, i, d[0], d[1], d[2], d[3]);
 161    }
 162    else {
 163       for (; i < count; STRIDE_F(d, v->stride), i++)
 164          printf(t, i, d[0], d[1], d[2], d[3]);
 165    }
 166
 167    for (j = v->size; j < 4; j++) {
 168       if ((v->flags & (1<<j)) == 0) {
 169
 170          printf("checking col %u is clean as advertised ", j);
 171
 172          for (i = 0, d = (GLfloat *) v->data;
 173               i < count && d[j] == c[j];
 174               i++, STRIDE_F(d, v->stride)) {
 175             /* no-op */
 176          }
 177
 178          if (i == count)
 179             printf(" --> ok\n");
 180          else
 181             printf(" --> Failed at %u ******\n", i);
 182       }
 183    }
 184 }