1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
5 * Copyright (C) 2009 VMware, Inc. 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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 #ifndef MATRIX_H
28 #define MATRIX_H
29
30
31 #include "util/glheader.h"
32
33 struct gl_context;
34 struct gl_matrix_stack;
35
36 extern void
37 _mesa_load_identity_matrix(struct gl_context *ctx, struct gl_matrix_stack *s);
38
39 extern void
40 _mesa_load_matrix(struct gl_context *ctx, struct gl_matrix_stack *s,
41 const GLfloat *m);
42
43 extern void
44 _mesa_init_matrix( struct gl_context * ctx );
45
46 extern void
47 _mesa_init_transform( struct gl_context *ctx );
48
49 extern void
50 _mesa_free_matrix_data( struct gl_context *ctx );
51
52 extern void
53 _mesa_update_modelview_project( struct gl_context *ctx, GLuint newstate );
54
55 /* "m" must be a 4x4 matrix. Return true if it's the identity matrix. */
56 static inline bool
_mesa_matrix_is_identity(const float * m)57 _mesa_matrix_is_identity(const float *m)
58 {
59 const uint32_t *u = (const uint32_t *)m;
60 const uint32_t one = IEEE_ONE;
61
62 /* This is faster than memcmp with static identity matrix. Instead of
63 * comparing every non-diagonal element against zero, OR them and compare
64 * the result. Verified with Viewperf13/Sw/teslaTower_shaded.
65 */
66 return u[0] == one && u[5] == one && u[10] == one && u[15] == one &&
67 !(u[1] | u[2] | u[3] | u[4] | u[6] | u[7] | u[8] | u[9] | u[11] |
68 u[12] | u[13] | u[14]);
69 }
70
71 #endif
72