/* * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice including the dates of first publication and * either this permission notice or a reference to * http://oss.sgi.com/projects/FreeB/ * shall be included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Except as contained in this notice, the name of Silicon Graphics, Inc. * shall not be used in advertising or otherwise to promote the sale, use or * other dealings in this Software without prior written authorization from * Silicon Graphics, Inc. */ #include <GL/gl.h> #include "glxclient.h" /* ** Return the number of elements per group of a specified format */ GLint __glElementsPerGroup(GLenum format, GLenum type) { /* ** To make row length computation valid for image extraction, ** packed pixel types assume elements per group equals one. */ switch (type) { case GL_UNSIGNED_BYTE_3_3_2: case GL_UNSIGNED_BYTE_2_3_3_REV: case GL_UNSIGNED_SHORT_5_6_5: case GL_UNSIGNED_SHORT_5_6_5_REV: case GL_UNSIGNED_SHORT_4_4_4_4: case GL_UNSIGNED_SHORT_4_4_4_4_REV: case GL_UNSIGNED_SHORT_5_5_5_1: case GL_UNSIGNED_SHORT_1_5_5_5_REV: case GL_UNSIGNED_SHORT_8_8_APPLE: case GL_UNSIGNED_SHORT_8_8_REV_APPLE: case GL_UNSIGNED_INT_8_8_8_8: case GL_UNSIGNED_INT_8_8_8_8_REV: case GL_UNSIGNED_INT_10_10_10_2: case GL_UNSIGNED_INT_2_10_10_10_REV: case GL_UNSIGNED_INT_24_8_NV: return 1; default: break; } switch (format) { case GL_RGB: case GL_BGR: case GL_RGB_INTEGER_EXT: case GL_BGR_INTEGER_EXT: return 3; case GL_RG: case GL_422_EXT: case GL_422_REV_EXT: case GL_422_AVERAGE_EXT: case GL_422_REV_AVERAGE_EXT: case GL_DEPTH_STENCIL_NV: case GL_YCBCR_422_APPLE: case GL_LUMINANCE_ALPHA: case GL_LUMINANCE_ALPHA_INTEGER_EXT: return 2; case GL_RGBA: case GL_BGRA: case GL_ABGR_EXT: case GL_RGBA_INTEGER_EXT: case GL_BGRA_INTEGER_EXT: return 4; case GL_COLOR_INDEX: case GL_STENCIL_INDEX: case GL_DEPTH_COMPONENT: case GL_RED: case GL_GREEN: case GL_BLUE: case GL_ALPHA: case GL_LUMINANCE: case GL_INTENSITY: case GL_RED_INTEGER_EXT: case GL_GREEN_INTEGER_EXT: case GL_BLUE_INTEGER_EXT: case GL_ALPHA_INTEGER_EXT: case GL_LUMINANCE_INTEGER_EXT: return 1; default: return 0; } } /* ** Return the number of bytes per element, based on the element type (other ** than GL_BITMAP). */ GLint __glBytesPerElement(GLenum type) { switch (type) { case GL_UNSIGNED_SHORT: case GL_SHORT: case GL_UNSIGNED_SHORT_5_6_5: case GL_UNSIGNED_SHORT_5_6_5_REV: case GL_UNSIGNED_SHORT_4_4_4_4: case GL_UNSIGNED_SHORT_4_4_4_4_REV: case GL_UNSIGNED_SHORT_5_5_5_1: case GL_UNSIGNED_SHORT_1_5_5_5_REV: case GL_UNSIGNED_SHORT_8_8_APPLE: case GL_UNSIGNED_SHORT_8_8_REV_APPLE: return 2; case GL_UNSIGNED_BYTE: case GL_BYTE: case GL_UNSIGNED_BYTE_3_3_2: case GL_UNSIGNED_BYTE_2_3_3_REV: return 1; case GL_INT: case GL_UNSIGNED_INT: case GL_FLOAT: case GL_UNSIGNED_INT_8_8_8_8: case GL_UNSIGNED_INT_8_8_8_8_REV: case GL_UNSIGNED_INT_10_10_10_2: case GL_UNSIGNED_INT_2_10_10_10_REV: case GL_UNSIGNED_INT_24_8_NV: return 4; default: return 0; } } /* ** Compute memory required for internal packed array of data of given type ** and format. */ GLint __glImageSize(GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, GLenum target) { int bytes_per_row; int components; switch (target) { case GL_PROXY_TEXTURE_1D: case GL_PROXY_TEXTURE_2D: case GL_PROXY_TEXTURE_3D: case GL_PROXY_TEXTURE_4D_SGIS: case GL_PROXY_TEXTURE_CUBE_MAP: case GL_PROXY_TEXTURE_RECTANGLE_ARB: case GL_PROXY_HISTOGRAM: case GL_PROXY_COLOR_TABLE: case GL_PROXY_TEXTURE_COLOR_TABLE_SGI: case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE: case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE: case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP: return 0; } if (width < 0 || height < 0 || depth < 0) { return 0; } /* ** Zero is returned if either format or type are invalid. */ components = __glElementsPerGroup(format, type); if (type == GL_BITMAP) { if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) { bytes_per_row = (width + 7) >> 3; } else { return 0; } } else { bytes_per_row = __glBytesPerElement(type) * width; } return bytes_per_row * height * depth * components; }