diff options
Diffstat (limited to 'src/glx/compsize.c')
| -rw-r--r-- | src/glx/compsize.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/glx/compsize.c b/src/glx/compsize.c new file mode 100644 index 0000000000..5ba6dc919e --- /dev/null +++ b/src/glx/compsize.c @@ -0,0 +1,189 @@ +/* + * 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_SHORT_15_1_MESA: + case GL_UNSIGNED_SHORT_1_15_REV_MESA: + 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: + case GL_UNSIGNED_INT_24_8_MESA: + case GL_UNSIGNED_INT_8_24_REV_MESA: + return 1; + default: + break; + } + + switch (format) { + case GL_RGB: + case GL_BGR: + return 3; + case GL_422_EXT: + case GL_422_REV_EXT: + case GL_422_AVERAGE_EXT: + case GL_422_REV_AVERAGE_EXT: + case GL_YCBCR_422_APPLE: + case GL_LUMINANCE_ALPHA: + return 2; + case GL_RGBA: + case GL_BGRA: + case GL_ABGR_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: + 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: + case GL_UNSIGNED_SHORT_15_1_MESA: + case GL_UNSIGNED_SHORT_1_15_REV_MESA: + 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: + case GL_UNSIGNED_INT_24_8_MESA: + case GL_UNSIGNED_INT_8_24_REV_MESA: + 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; +} |