1 /*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included 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 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31 #include <GL/gl.h>
32 #include "glxclient.h"
33
34 /*
35 ** Return the number of elements per group of a specified format
36 */
37 GLint
__glElementsPerGroup(GLenum format,GLenum type)38 __glElementsPerGroup(GLenum format, GLenum type)
39 {
40 /*
41 ** To make row length computation valid for image extraction,
42 ** packed pixel types assume elements per group equals one.
43 */
44 switch (type) {
45 case GL_UNSIGNED_BYTE_3_3_2:
46 case GL_UNSIGNED_BYTE_2_3_3_REV:
47 case GL_UNSIGNED_SHORT_5_6_5:
48 case GL_UNSIGNED_SHORT_5_6_5_REV:
49 case GL_UNSIGNED_SHORT_4_4_4_4:
50 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
51 case GL_UNSIGNED_SHORT_5_5_5_1:
52 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
53 case GL_UNSIGNED_SHORT_8_8_APPLE:
54 case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
55 case GL_UNSIGNED_INT_8_8_8_8:
56 case GL_UNSIGNED_INT_8_8_8_8_REV:
57 case GL_UNSIGNED_INT_10_10_10_2:
58 case GL_UNSIGNED_INT_2_10_10_10_REV:
59 case GL_UNSIGNED_INT_24_8_NV:
60 return 1;
61 default:
62 break;
63 }
64
65 switch (format) {
66 case GL_RGB:
67 case GL_BGR:
68 return 3;
69 case GL_RG:
70 case GL_422_EXT:
71 case GL_422_REV_EXT:
72 case GL_422_AVERAGE_EXT:
73 case GL_422_REV_AVERAGE_EXT:
74 case GL_DEPTH_STENCIL_NV:
75 case GL_YCBCR_422_APPLE:
76 case GL_LUMINANCE_ALPHA:
77 return 2;
78 case GL_RGBA:
79 case GL_BGRA:
80 case GL_ABGR_EXT:
81 return 4;
82 case GL_COLOR_INDEX:
83 case GL_STENCIL_INDEX:
84 case GL_DEPTH_COMPONENT:
85 case GL_RED:
86 case GL_GREEN:
87 case GL_BLUE:
88 case GL_ALPHA:
89 case GL_LUMINANCE:
90 case GL_INTENSITY:
91 return 1;
92 default:
93 return 0;
94 }
95 }
96
97 /*
98 ** Return the number of bytes per element, based on the element type (other
99 ** than GL_BITMAP).
100 */
101 GLint
__glBytesPerElement(GLenum type)102 __glBytesPerElement(GLenum type)
103 {
104 switch (type) {
105 case GL_UNSIGNED_SHORT:
106 case GL_SHORT:
107 case GL_UNSIGNED_SHORT_5_6_5:
108 case GL_UNSIGNED_SHORT_5_6_5_REV:
109 case GL_UNSIGNED_SHORT_4_4_4_4:
110 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
111 case GL_UNSIGNED_SHORT_5_5_5_1:
112 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
113 case GL_UNSIGNED_SHORT_8_8_APPLE:
114 case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
115 return 2;
116 case GL_UNSIGNED_BYTE:
117 case GL_BYTE:
118 case GL_UNSIGNED_BYTE_3_3_2:
119 case GL_UNSIGNED_BYTE_2_3_3_REV:
120 return 1;
121 case GL_INT:
122 case GL_UNSIGNED_INT:
123 case GL_FLOAT:
124 case GL_UNSIGNED_INT_8_8_8_8:
125 case GL_UNSIGNED_INT_8_8_8_8_REV:
126 case GL_UNSIGNED_INT_10_10_10_2:
127 case GL_UNSIGNED_INT_2_10_10_10_REV:
128 case GL_UNSIGNED_INT_24_8_NV:
129 return 4;
130 default:
131 return 0;
132 }
133 }
134
135 /*
136 ** Compute memory required for internal packed array of data of given type
137 ** and format.
138 */
139 GLint
__glImageSize(GLsizei width,GLsizei height,GLsizei depth,GLenum format,GLenum type,GLenum target)140 __glImageSize(GLsizei width, GLsizei height, GLsizei depth,
141 GLenum format, GLenum type, GLenum target)
142 {
143 int bytes_per_row;
144 int components;
145
146 switch (target) {
147 case GL_PROXY_TEXTURE_1D:
148 case GL_PROXY_TEXTURE_2D:
149 case GL_PROXY_TEXTURE_3D:
150 case GL_PROXY_TEXTURE_4D_SGIS:
151 case GL_PROXY_TEXTURE_CUBE_MAP:
152 case GL_PROXY_TEXTURE_RECTANGLE_ARB:
153 case GL_PROXY_HISTOGRAM:
154 case GL_PROXY_COLOR_TABLE:
155 case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
156 case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
157 case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
158 case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP:
159 return 0;
160 }
161
162 if (width < 0 || height < 0 || depth < 0) {
163 return 0;
164 }
165
166 /*
167 ** Zero is returned if either format or type are invalid.
168 */
169 components = __glElementsPerGroup(format, type);
170 if (type == GL_BITMAP) {
171 if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
172 bytes_per_row = (width + 7) >> 3;
173 }
174 else {
175 return 0;
176 }
177 }
178 else {
179 bytes_per_row = __glBytesPerElement(type) * width;
180 }
181
182 return bytes_per_row * height * depth * components;
183 }
184