src/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
  30 #include "main/glheader.h"
  31 #include "main/imports.h"
  32 #include "main/macros.h"
  33 #include "main/imports.h"
  34
  35 #include "m_vector.h"
  36
  37
  38
  39 /**
  40  * Given a vector [count][4] of floats, set all the [][elt] values
  41  * to 0 (if elt = 0, 1, 2) or 1.0 (if elt = 3).
  42  */
  43 void
  44 _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint count, GLuint elt )
  45 {
  46    static const GLubyte elem_bits[4] = {
  47       VEC_DIRTY_0,
  48       VEC_DIRTY_1,
  49       VEC_DIRTY_2,
  50       VEC_DIRTY_3
  51    };
  52    static const GLfloat clean[4] = { 0, 0, 0, 1 };
  53    const GLfloat v = clean[elt];
  54    GLfloat (*data)[4] = (GLfloat (*)[4])vec->start;
  55    GLuint i;
  56
  57    for (i = 0; i < count; i++)
  58       data[i][elt] = v;
  59
  60    vec->flags &= ~elem_bits[elt];
  61 }
  62
  63
  64 static const GLubyte size_bits[5] = {
  65    0,
  66    VEC_SIZE_1,
  67    VEC_SIZE_2,
  68    VEC_SIZE_3,
  69    VEC_SIZE_4,
  70 };
  71
  72
  73 /**
  74  * Initialize GLvector objects.
  75  * \param v  the vector object to initialize.
  76  * \param flags  bitwise-OR of VEC_* flags
  77  * \param storage  pointer to storage for the vector's data
  78  */
  79 void
  80 _mesa_vector4f_init( GLvector4f *v, GLbitfield flags, GLfloat (*storage)[4] )
  81 {
  82    v->stride = 4 * sizeof(GLfloat);
  83    v->size = 2;   /* may change: 2-4 for vertices and 1-4 for texcoords */
  84    v->data = storage;
  85    v->start = (GLfloat *) storage;
  86    v->count = 0;
  87    v->flags = size_bits[4] | flags;
  88 }
  89
  90
  91 /**
  92  * Initialize GLvector objects and allocate storage.
  93  * \param v  the vector object
  94  * \param flags  bitwise-OR of VEC_* flags
  95  * \param count  number of elements to allocate in vector
  96  * \param alignment  desired memory alignment for the data (in bytes)
  97  */
  98 void
  99 _mesa_vector4f_alloc( GLvector4f *v, GLbitfield flags, GLuint count,
 100                       GLuint alignment )
 101 {
 102    v->stride = 4 * sizeof(GLfloat);
 103    v->size = 2;
 104    v->storage = ALIGN_MALLOC( count * 4 * sizeof(GLfloat), alignment );
 105    v->storage_count = count;
 106    v->start = (GLfloat *) v->storage;
 107    v->data = (GLfloat (*)[4]) v->storage;
 108    v->count = 0;
 109    v->flags = size_bits[4] | flags | VEC_MALLOC;
 110 }
 111
 112
 113 /**
 114  * Vector deallocation.  Free whatever memory is pointed to by the
 115  * vector's storage field if the VEC_MALLOC flag is set.
 116  * DO NOT free the GLvector object itself, though.
 117  */
 118 void
 119 _mesa_vector4f_free( GLvector4f *v )
 120 {
 121    if (v->flags & VEC_MALLOC) {
 122       ALIGN_FREE( v->storage );
 123       v->data = NULL;
 124       v->start = NULL;
 125       v->storage = NULL;
 126       v->flags &= ~VEC_MALLOC;
 127    }
 128 }
 129
 130
 131 /**
 132  * For debugging
 133  */
 134 void
 135 _mesa_vector4f_print( const GLvector4f *v, const GLubyte *cullmask,
 136                       GLboolean culling )
 137 {
 138    static const GLfloat c[4] = { 0, 0, 0, 1 };
 139    static const char *templates[5] = {
 140       "%d:\t0, 0, 0, 1\n",
 141       "%d:\t%f, 0, 0, 1\n",
 142       "%d:\t%f, %f, 0, 1\n",
 143       "%d:\t%f, %f, %f, 1\n",
 144       "%d:\t%f, %f, %f, %f\n"
 145    };
 146
 147    const char *t = templates[v->size];
 148    GLfloat *d = (GLfloat *)v->data;
 149    GLuint j, i = 0, count;
 150
 151    _mesa_printf("data-start\n");
 152    for (; d != v->start; STRIDE_F(d, v->stride), i++)
 153       _mesa_printf(t, i, d[0], d[1], d[2], d[3]);
 154
 155    _mesa_printf("start-count(%u)\n", v->count);
 156    count = i + v->count;
 157
 158    if (culling) {
 159       for (; i < count; STRIDE_F(d, v->stride), i++)
 160          if (cullmask[i])
 161             _mesa_printf(t, i, d[0], d[1], d[2], d[3]);
 162    }
 163    else {
 164       for (; i < count; STRIDE_F(d, v->stride), i++)
 165          _mesa_printf(t, i, d[0], d[1], d[2], d[3]);
 166    }
 167
 168    for (j = v->size; j < 4; j++) {
 169       if ((v->flags & (1<<j)) == 0) {
 170
 171          _mesa_printf("checking col %u is clean as advertised ", j);
 172
 173          for (i = 0, d = (GLfloat *) v->data;
 174               i < count && d[j] == c[j];
 175               i++, STRIDE_F(d, v->stride)) {
 176             /* no-op */
 177          }
 178
 179          if (i == count)
 180             _mesa_printf(" --> ok\n");
 181          else
 182             _mesa_printf(" --> Failed at %u ******\n", i);
 183       }
 184    }
 185 }