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+/* $XFree86: xc/lib/GL/glx/compsize.c,v 1.6 2004/01/28 18:11:38 alanh Exp $ */
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+*/
+
+#include <GL/gl.h>
+#include "indirect_size.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;
+}