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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 #include <stdio.h>
30 #include <stddef.h>
31 
32 #include "main/glheader.h"
33 #include "main/macros.h"
34 
35 #include "m_vector.h"
36 
37 #include "util/u_memory.h"
38 
39 
40 
41 /**
42  * Given a vector [count][4] of floats, set all the [][elt] values
43  * to 0 (if elt = 0, 1, 2) or 1.0 (if elt = 3).
44  */
45 void
_mesa_vector4f_clean_elem(GLvector4f * vec,GLuint count,GLuint elt)46 _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint count, GLuint elt )
47 {
48    static const GLubyte elem_bits[4] = {
49       VEC_DIRTY_0,
50       VEC_DIRTY_1,
51       VEC_DIRTY_2,
52       VEC_DIRTY_3
53    };
54    static const GLfloat clean[4] = { 0, 0, 0, 1 };
55    const GLfloat v = clean[elt];
56    GLfloat (*data)[4] = (GLfloat (*)[4])vec->start;
57    GLuint i;
58 
59    for (i = 0; i < count; i++)
60       data[i][elt] = v;
61 
62    vec->flags &= ~elem_bits[elt];
63 }
64 
65 
66 static const GLubyte size_bits[5] = {
67    0,
68    VEC_SIZE_1,
69    VEC_SIZE_2,
70    VEC_SIZE_3,
71    VEC_SIZE_4,
72 };
73 
74 
75 /**
76  * Initialize GLvector objects.
77  * \param v  the vector object to initialize.
78  * \param flags  bitwise-OR of VEC_* flags
79  * \param storage  pointer to storage for the vector's data
80  */
81 void
_mesa_vector4f_init(GLvector4f * v,GLbitfield flags,GLfloat (* storage)[4])82 _mesa_vector4f_init( GLvector4f *v, GLbitfield flags, GLfloat (*storage)[4] )
83 {
84    STATIC_ASSERT(V4F_DATA == offsetof(GLvector4f, data));
85    STATIC_ASSERT(V4F_START == offsetof(GLvector4f, start));
86    STATIC_ASSERT(V4F_COUNT == offsetof(GLvector4f, count));
87    STATIC_ASSERT(V4F_STRIDE == offsetof(GLvector4f, stride));
88    STATIC_ASSERT(V4F_SIZE == offsetof(GLvector4f, size));
89    STATIC_ASSERT(V4F_FLAGS == offsetof(GLvector4f, flags));
90 
91    v->stride = 4 * sizeof(GLfloat);
92    v->size = 2;   /* may change: 2-4 for vertices and 1-4 for texcoords */
93    v->data = storage;
94    v->start = (GLfloat *) storage;
95    v->count = 0;
96    v->flags = size_bits[4] | flags;
97 }
98 
99 
100 /**
101  * Initialize GLvector objects and allocate storage.
102  * \param v  the vector object
103  * \param flags  bitwise-OR of VEC_* flags
104  * \param count  number of elements to allocate in vector
105  * \param alignment  desired memory alignment for the data (in bytes)
106  */
107 void
_mesa_vector4f_alloc(GLvector4f * v,GLbitfield flags,GLuint count,GLuint alignment)108 _mesa_vector4f_alloc( GLvector4f *v, GLbitfield flags, GLuint count,
109                       GLuint alignment )
110 {
111    v->stride = 4 * sizeof(GLfloat);
112    v->size = 2;
113    v->storage = align_malloc( count * 4 * sizeof(GLfloat), alignment );
114    v->storage_count = count;
115    v->start = (GLfloat *) v->storage;
116    v->data = (GLfloat (*)[4]) v->storage;
117    v->count = 0;
118    v->flags = size_bits[4] | flags | VEC_MALLOC;
119 }
120 
121 
122 /**
123  * Vector deallocation.  Free whatever memory is pointed to by the
124  * vector's storage field if the VEC_MALLOC flag is set.
125  * DO NOT free the GLvector object itself, though.
126  */
127 void
_mesa_vector4f_free(GLvector4f * v)128 _mesa_vector4f_free( GLvector4f *v )
129 {
130    if (v->flags & VEC_MALLOC) {
131       align_free( v->storage );
132       v->data = NULL;
133       v->start = NULL;
134       v->storage = NULL;
135       v->flags &= ~VEC_MALLOC;
136    }
137 }
138 
139 
140 /**
141  * For debugging
142  */
143 void
_mesa_vector4f_print(const GLvector4f * v,const GLubyte * cullmask,GLboolean culling)144 _mesa_vector4f_print( const GLvector4f *v, const GLubyte *cullmask,
145                       GLboolean culling )
146 {
147    static const GLfloat c[4] = { 0, 0, 0, 1 };
148    static const char *templates[5] = {
149       "%d:\t0, 0, 0, 1\n",
150       "%d:\t%f, 0, 0, 1\n",
151       "%d:\t%f, %f, 0, 1\n",
152       "%d:\t%f, %f, %f, 1\n",
153       "%d:\t%f, %f, %f, %f\n"
154    };
155 
156    const char *t = templates[v->size];
157    GLfloat *d = (GLfloat *)v->data;
158    GLuint j, i = 0, count;
159 
160    printf("data-start\n");
161    for (; d != v->start; STRIDE_F(d, v->stride), i++)
162       printf(t, i, d[0], d[1], d[2], d[3]);
163 
164    printf("start-count(%u)\n", v->count);
165    count = i + v->count;
166 
167    if (culling) {
168       for (; i < count; STRIDE_F(d, v->stride), i++)
169 	 if (cullmask[i])
170 	    printf(t, i, d[0], d[1], d[2], d[3]);
171    }
172    else {
173       for (; i < count; STRIDE_F(d, v->stride), i++)
174 	 printf(t, i, d[0], d[1], d[2], d[3]);
175    }
176 
177    for (j = v->size; j < 4; j++) {
178       if ((v->flags & (1<<j)) == 0) {
179 
180 	 printf("checking col %u is clean as advertised ", j);
181 
182 	 for (i = 0, d = (GLfloat *) v->data;
183 	      i < count && d[j] == c[j];
184 	      i++, STRIDE_F(d, v->stride)) {
185             /* no-op */
186          }
187 
188 	 if (i == count)
189 	    printf(" --> ok\n");
190 	 else
191 	    printf(" --> Failed at %u ******\n", i);
192       }
193    }
194 }
195