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/*
* 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;
}
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