2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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15 * shall be included in all copies or substantial portions of the Software.
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28 * Silicon Graphics, Inc.
32 #include "glxclient.h"
35 ** Return the number of elements per group of a specified format
38 __glElementsPerGroup(GLenum format, GLenum type)
41 ** To make row length computation valid for image extraction,
42 ** packed pixel types assume elements per group equals one.
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:
72 case GL_422_AVERAGE_EXT:
73 case GL_422_REV_AVERAGE_EXT:
74 case GL_YCBCR_422_APPLE:
75 case GL_LUMINANCE_ALPHA:
82 case GL_STENCIL_INDEX:
83 case GL_DEPTH_COMPONENT:
97 ** Return the number of bytes per element, based on the element type (other
101 __glBytesPerElement(GLenum type)
104 case GL_UNSIGNED_SHORT:
106 case GL_UNSIGNED_SHORT_5_6_5:
107 case GL_UNSIGNED_SHORT_5_6_5_REV:
108 case GL_UNSIGNED_SHORT_4_4_4_4:
109 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
110 case GL_UNSIGNED_SHORT_5_5_5_1:
111 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
112 case GL_UNSIGNED_SHORT_8_8_APPLE:
113 case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
115 case GL_UNSIGNED_BYTE:
117 case GL_UNSIGNED_BYTE_3_3_2:
118 case GL_UNSIGNED_BYTE_2_3_3_REV:
121 case GL_UNSIGNED_INT:
123 case GL_UNSIGNED_INT_8_8_8_8:
124 case GL_UNSIGNED_INT_8_8_8_8_REV:
125 case GL_UNSIGNED_INT_10_10_10_2:
126 case GL_UNSIGNED_INT_2_10_10_10_REV:
127 case GL_UNSIGNED_INT_24_8_NV:
135 ** Compute memory required for internal packed array of data of given type
139 __glImageSize(GLsizei width, GLsizei height, GLsizei depth,
140 GLenum format, GLenum type, GLenum target)
146 case GL_PROXY_TEXTURE_1D:
147 case GL_PROXY_TEXTURE_2D:
148 case GL_PROXY_TEXTURE_3D:
149 case GL_PROXY_TEXTURE_4D_SGIS:
150 case GL_PROXY_TEXTURE_CUBE_MAP:
151 case GL_PROXY_TEXTURE_RECTANGLE_ARB:
152 case GL_PROXY_HISTOGRAM:
153 case GL_PROXY_COLOR_TABLE:
154 case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
155 case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
156 case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
157 case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP:
161 if (width < 0 || height < 0 || depth < 0) {
166 ** Zero is returned if either format or type are invalid.
168 components = __glElementsPerGroup(format, type);
169 if (type == GL_BITMAP) {
170 if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
171 bytes_per_row = (width + 7) >> 3;
178 bytes_per_row = __glBytesPerElement(type) * width;
181 return bytes_per_row * height * depth * components;