rensize.c

/*
** 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.
**
*/

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <GL/gl.h>
#include "glxserver.h"
#include "GL/glxproto.h"
#include "unpack.h"
#include "impsize.h"

#define SWAPL(a) \
  (((a & 0xff000000U)>>24) | ((a & 0xff0000U)>>8) | \
   ((a & 0xff00U)<<8) | ((a & 0xffU)<<24))

int __glXCallListsReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLsizei n = *(GLsizei *)(pc + 0);
    GLenum type = *(GLenum *)(pc + 4);

    if (swap) {
	n = SWAPL( n );
	type = SWAPL( type );
    }
    return n * __glCallLists_size( type );
}

int __glXFogivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 0);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glFogiv_size( pname );		/* defined in samplegl lib */
}

int __glXFogfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXFogivReqSize( pc, swap, reqlen);
}

int __glXLightfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glLightfv_size( pname );	/* defined in samplegl lib */
}

int __glXLightivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXLightfvReqSize( pc, swap, reqlen);
}

int __glXLightModelfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 0);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glLightModelfv_size( pname );	/* defined in samplegl lib */
}

int __glXLightModelivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXLightModelfvReqSize( pc, swap, reqlen);
}

int __glXMaterialfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glMaterialfv_size( pname );	/* defined in samplegl lib */
}

int __glXMaterialivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXMaterialfvReqSize( pc, swap, reqlen);
}

int __glXTexGendvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 8 * __glTexGendv_size( pname );	/* defined in samplegl lib */
}

int __glXTexGenfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glTexGenfv_size( pname );	/* defined in samplegl lib */
}

int __glXTexGenivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXTexGenfvReqSize( pc, swap, reqlen);
}

int __glXTexParameterfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glTexParameterfv_size( pname ); /* defined in samplegl lib */
}

int __glXTexParameterivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXTexParameterfvReqSize( pc, swap, reqlen);
}

int __glXTexEnvfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glTexEnvfv_size( pname );	/* defined in samplegl lib */
}

int __glXTexEnvivReqSize(GLbyte *pc, Bool swap, int reqlen )
{
    return __glXTexEnvfvReqSize( pc, swap, reqlen);
}

int __glXMap1dReqSize(GLbyte *pc, Bool swap, int reqlen )
{
    GLenum target;
    GLint order;

    target = *(GLenum*) (pc + 16);
    order = *(GLint*) (pc + 20);
    if (swap) {
	target = SWAPL( target );
	order = SWAPL( order );
    }
    if (order < 1)
	return -1;
    return safe_mul(8, safe_mul(__glMap1d_size(target), order));
}

int __glXMap1fReqSize(GLbyte *pc, Bool swap, int reqlen )
{
    GLenum target;
    GLint order;

    target = *(GLenum *)(pc + 0);
    order = *(GLint *)(pc + 12);
    if (swap) {
	target = SWAPL( target );
	order = SWAPL( order );
    }
    if (order < 1)
	return -1;
    return safe_mul(4, safe_mul(__glMap1f_size(target), order));
}

static int Map2Size(int k, int majorOrder, int minorOrder)
{
    if (majorOrder < 1 || minorOrder < 1) return -1;
    return safe_mul(k, safe_mul(majorOrder, minorOrder));
}

int __glXMap2dReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum target;
    GLint uorder, vorder;

    target = *(GLenum *)(pc + 32);
    uorder = *(GLint *)(pc + 36);
    vorder = *(GLint *)(pc + 40);
    if (swap) {
	target = SWAPL( target );
	uorder = SWAPL( uorder );
	vorder = SWAPL( vorder );
    }
    return safe_mul(8, Map2Size(__glMap2d_size(target), uorder, vorder));
}

int __glXMap2fReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum target;
    GLint uorder, vorder;

    target = *(GLenum *)(pc + 0);
    uorder = *(GLint *)(pc + 12);
    vorder = *(GLint *)(pc + 24);
    if (swap) {
	target = SWAPL( target );
	uorder = SWAPL( uorder );
	vorder = SWAPL( vorder );
    }
    return safe_mul(4, Map2Size(__glMap2f_size(target), uorder, vorder));
}

int __glXPixelMapfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLint mapsize;
    mapsize = *(GLint *)(pc + 4);
    if (swap) {
	mapsize = SWAPL( mapsize );
    }
    return 4 * mapsize;
}

int __glXPixelMapuivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXPixelMapfvReqSize( pc, swap, reqlen);
}

int __glXPixelMapusvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLint mapsize;
    mapsize = *(GLint *)(pc + 4);
    if (swap) {
	mapsize = SWAPL( mapsize );
    }
    return 2 * mapsize;
}

/**
 * Calculate the size of an image.
 * 
 * The size of an image sent to the server from the client or sent from the
 * server to the client is calculated.  The size is based on the dimensions
 * of the image, the type of pixel data, padding in the image, and the
 * alignment requirements of the image.
 * 
 * \param format       Format of the pixels.  Same as the \c format parameter
 *                     to \c glTexImage1D
 * \param type         Type of the pixel data.  Same as the \c type parameter
 *                     to \c glTexImage1D
 * \param target       Typically the texture target of the image.  If the
 *                     target is one of \c GL_PROXY_*, the size returned is
 *                     always zero. For uses that do not have a texture target
 *                     (e.g, glDrawPixels), zero should be specified.
 * \param w            Width of the image data.  Must be >= 1.
 * \param h            Height of the image data.  Must be >= 1, even for 1D
 *                     images.
 * \param d            Depth of the image data.  Must be >= 1, even for 1D or
 *                     2D images.
 * \param imageHeight  If non-zero, defines the true height of a volumetric
 *                     image.  This value will be used instead of \c h for
 *                     calculating the size of the image.
 * \param rowLength    If non-zero, defines the true width of an image.  This
 *                     value will be used instead of \c w for calculating the
 *                     size of the image.
 * \param skipImages   Number of extra layers of image data in a volumtric
 *                     image that are to be skipped before the real data.
 * \param skipRows     Number of extra rows of image data in an image that are
 *                     to be skipped before the real data.
 * \param alignment    Specifies the alignment for the start of each pixel row
 *                     in memory.  This value must be one of 1, 2, 4, or 8.
 *
 * \returns
 * The size of the image is returned.  If the specified \c format and \c type
 * are invalid, -1 is returned.  If \c target is one of \c GL_PROXY_*, zero
 * is returned.
 */
int __glXImageSize( GLenum format, GLenum type, GLenum target,
		    GLsizei w, GLsizei h, GLsizei d,
		    GLint imageHeight, GLint rowLength,
		    GLint skipImages, GLint skipRows, GLint alignment )
{
    GLint bytesPerElement, elementsPerGroup, groupsPerRow;
    GLint groupSize, rowSize, padding, imageSize;

    if (w == 0 || h == 0 || d == 0)
        return 0;

    if (w < 0 || h < 0 || d < 0 ||
	(type == GL_BITMAP &&
	 (format != GL_COLOR_INDEX && format != GL_STENCIL_INDEX))) {
	return -1;
    }

    /* proxy targets have no data */
    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;
    }

    /* real data has to have real sizes */
    if (imageHeight < 0 || rowLength < 0 || skipImages < 0 || skipRows < 0)
        return -1;
    if (alignment != 1 && alignment != 2 && alignment != 4 && alignment != 8)
        return -1;

    if (type == GL_BITMAP) {
	if (rowLength > 0) {
	    groupsPerRow = rowLength;
	} else {
	    groupsPerRow = w;
	}
	rowSize = (groupsPerRow + 7) >> 3;
        if (rowSize < 0)
            return -1;
	padding = (rowSize % alignment);
	if (padding) {
	    rowSize += alignment - padding;
	}
        return safe_mul(safe_add(h, skipRows), rowSize);
    } else {
	switch(format) {
	  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:
	    elementsPerGroup = 1;
	    break;
	  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_DEPTH_STENCIL_MESA:
	  case GL_YCBCR_MESA:
	  case GL_LUMINANCE_ALPHA:
	    elementsPerGroup = 2;
	    break;
	  case GL_RGB:
	  case GL_BGR:
	    elementsPerGroup = 3;
	    break;
	  case GL_RGBA:
	  case GL_BGRA:
	  case GL_ABGR_EXT:
	    elementsPerGroup = 4;
	    break;
	  default:
	    return -1;
	}
	switch(type) {
	  case GL_UNSIGNED_BYTE:
	  case GL_BYTE:
	    bytesPerElement = 1;
	    break;
	  case GL_UNSIGNED_BYTE_3_3_2:
	  case GL_UNSIGNED_BYTE_2_3_3_REV:
	    bytesPerElement = 1;	    
	    elementsPerGroup = 1;
	    break;
	  case GL_UNSIGNED_SHORT:
	  case GL_SHORT:
	    bytesPerElement = 2;
	    break;
	  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:
	    bytesPerElement = 2;
	    elementsPerGroup = 1;
	    break;
	  case GL_INT:
	  case GL_UNSIGNED_INT:
	  case GL_FLOAT:
	    bytesPerElement = 4;
	    break;
	  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:
	    bytesPerElement = 4;
	    elementsPerGroup = 1;
	    break;
	  default:
	    return -1;
	}
        /* known safe by the switches above, not checked */
	groupSize = bytesPerElement * elementsPerGroup;
	if (rowLength > 0) {
	    groupsPerRow = rowLength;
	} else {
	    groupsPerRow = w;
	}
        if ((rowSize = safe_mul(groupsPerRow, groupSize)) < 0)
            return -1;
	padding = (rowSize % alignment);
	if (padding) {
	    rowSize += alignment - padding;
	}
        if (imageHeight > 0)
            h = imageHeight;
        h = safe_add(h, skipRows);

        imageSize = safe_mul(h, rowSize);
        return safe_mul(safe_add(d, skipImages), imageSize);
    }
}


int __glXDrawPixelsReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchDrawPixelsHeader *hdr = (__GLXdispatchDrawPixelsHeader *) pc;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    return __glXImageSize( format, type, 0, w, h, 1,
			   0, rowLength, 0, skipRows, alignment );
}

int __glXBitmapReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchBitmapHeader *hdr = (__GLXdispatchBitmapHeader *) pc;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	w = SWAPL( w );
	h = SWAPL( h );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    return __glXImageSize( GL_COLOR_INDEX, GL_BITMAP, 0, w, h, 1,
		      0, rowLength, 0, skipRows, alignment );
}

int __glXTexImage1DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchTexImageHeader *hdr = (__GLXdispatchTexImageHeader *) pc;
    GLenum target = hdr->target;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	target = SWAPL( target );
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    if (target == GL_PROXY_TEXTURE_1D) {
	return 0;
    } else if (format == GL_STENCIL_INDEX || format == GL_DEPTH_COMPONENT) {
	return -1;
    }
    return __glXImageSize( format, type, 0, w, 1, 1,
			   0, rowLength, 0, skipRows, alignment );
}

int __glXTexImage2DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchTexImageHeader *hdr = (__GLXdispatchTexImageHeader *) pc;
    GLenum target = hdr->target;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	target = SWAPL( target );
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    if (target == GL_PROXY_TEXTURE_2D || target == GL_PROXY_TEXTURE_CUBE_MAP_ARB) {
	return 0;
    } else if (format == GL_STENCIL_INDEX || format == GL_DEPTH_COMPONENT) {
	return -1;
    }
    return __glXImageSize( format, type, 0, w, h, 1,
			   0, rowLength, 0, skipRows, alignment );
}

/* XXX this is used elsewhere - should it be exported from glxserver.h? */
int __glXTypeSize(GLenum enm)
{
  switch(enm) {
    case GL_BYTE:		return sizeof(GLbyte);
    case GL_UNSIGNED_BYTE:	return sizeof(GLubyte);
    case GL_SHORT:		return sizeof(GLshort);
    case GL_UNSIGNED_SHORT:	return sizeof(GLushort);
    case GL_INT:		return sizeof(GLint);
    case GL_UNSIGNED_INT:	return sizeof(GLint);
    case GL_FLOAT:		return sizeof(GLfloat);
    case GL_DOUBLE:		return sizeof(GLdouble);
    default:			return -1;
  }
}

int __glXDrawArraysSize( GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchDrawArraysHeader *hdr = (__GLXdispatchDrawArraysHeader *) pc;
    __GLXdispatchDrawArraysComponentHeader *compHeader;
    GLint numVertexes = hdr->numVertexes;
    GLint numComponents = hdr->numComponents;
    GLint arrayElementSize = 0;
	GLint x, size;
    int i;

    if (swap) {
	numVertexes = SWAPL( numVertexes );
	numComponents = SWAPL( numComponents );
    }

    pc += sizeof(__GLXdispatchDrawArraysHeader);
    reqlen -= sizeof(__GLXdispatchDrawArraysHeader);

    size = safe_mul(sizeof(__GLXdispatchDrawArraysComponentHeader),
		    numComponents);
    if (size < 0 || reqlen < 0 || reqlen < size)
        return -1;
    
    compHeader = (__GLXdispatchDrawArraysComponentHeader *) pc;

    for (i=0; i<numComponents; i++) {
	GLenum datatype = compHeader[i].datatype;
	GLint numVals = compHeader[i].numVals;
	GLint component = compHeader[i].component;

	if (swap) {
	    datatype = SWAPL( datatype );
	    numVals = SWAPL( numVals );
	    component = SWAPL( component );
	}

	switch (component) {
	  case GL_VERTEX_ARRAY:
	  case GL_COLOR_ARRAY:
	  case GL_TEXTURE_COORD_ARRAY:
	    break;
	  case GL_SECONDARY_COLOR_ARRAY:
	  case GL_NORMAL_ARRAY:
	    if (numVals != 3) {
		/* bad size */
		return -1;
	    }
	    break;
	  case GL_FOG_COORD_ARRAY:
	  case GL_INDEX_ARRAY:
	    if (numVals != 1) {
		/* bad size */
		return -1;
	    }
	    break;
	  case GL_EDGE_FLAG_ARRAY:
	    if ((numVals != 1) && (datatype != GL_UNSIGNED_BYTE)) {
		/* bad size or bad type */
		return -1;
	    }
	    break;
	  default:
	    /* unknown component type */
	    return -1;
	}

        x = safe_pad(safe_mul(numVals, __glXTypeSize(datatype)));
        if ((arrayElementSize = safe_add(arrayElementSize, x)) < 0)
            return -1;

	pc += sizeof(__GLXdispatchDrawArraysComponentHeader);
    }

    return safe_add(size, safe_mul(numVertexes, arrayElementSize));
}

int __glXPrioritizeTexturesReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLint n = *(GLsizei *)(pc + 0);
    if (swap) n = SWAPL(n);
    return(8*n); /* 4*n for textures, 4*n for priorities */
}

int __glXTexSubImage1DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchTexSubImageHeader *hdr = (__GLXdispatchTexSubImageHeader *) pc;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    return __glXImageSize( format, type, 0, w, 1, 1,
			   0, rowLength, 0, skipRows, alignment );
}

int __glXTexSubImage2DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchTexSubImageHeader *hdr = (__GLXdispatchTexSubImageHeader *) pc;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    return __glXImageSize( format, type, 0, w, h, 1,
			   0, rowLength, 0, skipRows, alignment );
}

int __glXTexImage3DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchTexImage3DHeader *hdr = (__GLXdispatchTexImage3DHeader *) pc;
    GLenum target = hdr->target;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint d = hdr->depth;
    GLint imageHeight = hdr->imageHeight;
    GLint rowLength = hdr->rowLength;
    GLint skipImages = hdr->skipImages;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;
    GLint nullImage = hdr->nullimage;

    if (swap) {
	target = SWAPL( target );
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	d = SWAPL( d );
	imageHeight = SWAPL( imageHeight );
	rowLength = SWAPL( rowLength );
	skipImages = SWAPL( skipImages );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    if (target == GL_PROXY_TEXTURE_3D || nullImage) {
	return 0;
    } else {
	return __glXImageSize( format, type, target, w, h, d, imageHeight,
			       rowLength, skipImages, skipRows, alignment );
    }
}

int __glXTexSubImage3DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchTexSubImage3DHeader *hdr =
					(__GLXdispatchTexSubImage3DHeader *) pc;
    GLenum target = hdr->target;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint d = hdr->depth;
    GLint imageHeight = hdr->imageHeight;
    GLint rowLength = hdr->rowLength;
    GLint skipImages = hdr->skipImages;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	target = SWAPL( target );
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	d = SWAPL( d );
	imageHeight = SWAPL( imageHeight );
	rowLength = SWAPL( rowLength );
	skipImages = SWAPL( skipImages );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }
    if (target == GL_PROXY_TEXTURE_3D) {
	return 0;
    } else {
	return __glXImageSize( format, type, target, w, h, d, imageHeight,
			       rowLength, skipImages, skipRows, alignment );
    }
}

int __glXConvolutionFilter1DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchConvolutionFilterHeader *hdr =
			(__GLXdispatchConvolutionFilterHeader *) pc;

    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint rowLength = hdr->rowLength;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	rowLength = SWAPL( rowLength );
	alignment = SWAPL( alignment );
    }

    return __glXImageSize( format, type, 0, w, 1, 1, 
			   0, rowLength, 0, 0, alignment );
}

int __glXConvolutionFilter2DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchConvolutionFilterHeader *hdr =
			(__GLXdispatchConvolutionFilterHeader *) pc;

    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint rowLength = hdr->rowLength;
    GLint skipRows = hdr->skipRows;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	rowLength = SWAPL( rowLength );
	skipRows = SWAPL( skipRows );
	alignment = SWAPL( alignment );
    }

    return __glXImageSize( format, type, 0, w, h, 1,
			   0, rowLength, 0, skipRows, alignment );
}

int __glXConvolutionParameterivSize(GLenum pname)
{
    switch (pname) {
      case GL_CONVOLUTION_BORDER_COLOR:
      case GL_CONVOLUTION_FILTER_SCALE:
      case GL_CONVOLUTION_FILTER_BIAS:
	return 4;
      case GL_CONVOLUTION_BORDER_MODE:
	return 1;
      default:
	return -1;
    }
}

int __glXConvolutionParameterfvSize(GLenum pname)
{
    return __glXConvolutionParameterivSize(pname);
}

int __glXConvolutionParameterivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glXConvolutionParameterivSize( pname );
}

int __glXConvolutionParameterfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    return __glXConvolutionParameterivReqSize( pc, swap, reqlen);
}

int __glXSeparableFilter2DReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchConvolutionFilterHeader *hdr =
			(__GLXdispatchConvolutionFilterHeader *) pc;

    GLint image1size, image2size;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint h = hdr->height;
    GLint rowLength = hdr->rowLength;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	h = SWAPL( h );
	rowLength = SWAPL( rowLength );
	alignment = SWAPL( alignment );
    }

    /* XXX Should rowLength be used for either or both image? */
    image1size = __glXImageSize( format, type, 0, w, 1, 1,
				 0, rowLength, 0, 0, alignment );
    image2size = __glXImageSize( format, type, 0, h, 1, 1,
				 0, rowLength, 0, 0, alignment );
    return safe_add(safe_pad(image1size), image2size);

}

int __glXColorTableParameterfvSize(GLenum pname)
{
    /* currently, only scale and bias are supported; return RGBA */
    switch(pname) {
    case GL_COLOR_TABLE_SCALE:
    case GL_COLOR_TABLE_BIAS:
	return 4;
    default:
	return 0;
    }
}

int __glXColorTableParameterivSize(GLenum pname)
{
    /* fv and iv are the same in this context */
    return __glXColorTableParameterfvSize(pname);
}

int __glXColorTableReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchColorTableHeader *hdr =
			(__GLXdispatchColorTableHeader *) pc;

    GLenum target = hdr->target;
    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint w = hdr->width;
    GLint rowLength = hdr->rowLength;
    GLint alignment = hdr->alignment;

    switch (target) {
      case GL_PROXY_TEXTURE_1D:
      case GL_PROXY_TEXTURE_2D:
      case GL_PROXY_TEXTURE_3D:
      case GL_PROXY_COLOR_TABLE:
      case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
      case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
      case GL_PROXY_TEXTURE_CUBE_MAP_ARB:
          return 0;
    }

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	w = SWAPL( w );
	rowLength = SWAPL( rowLength );
	alignment = SWAPL( alignment );
    }

    return __glXImageSize( format, type, 0, w, 1, 1,
			   0, rowLength, 0, 0, alignment );
}

int __glXColorSubTableReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    __GLXdispatchColorSubTableHeader *hdr =
			(__GLXdispatchColorSubTableHeader *) pc;

    GLenum format = hdr->format;
    GLenum type = hdr->type;
    GLint count = hdr->count;
    GLint rowLength = hdr->rowLength;
    GLint alignment = hdr->alignment;

    if (swap) {
	format = SWAPL( format );
	type = SWAPL( type );
	count = SWAPL( count );
	rowLength = SWAPL( rowLength );
	alignment = SWAPL( alignment );
    }

    return __glXImageSize( format, type, 0, count, 1, 1,
			   0, rowLength, 0, 0, alignment );
}

int __glXColorTableParameterfvReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 4);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glXColorTableParameterfvSize(pname);
}

int __glXColorTableParameterivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    /* no difference between fv and iv versions */
    return __glXColorTableParameterfvReqSize(pc, swap, reqlen);
}

int __glXPointParameterfvARBReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    GLenum pname = *(GLenum *)(pc + 0);
    if (swap) {
	pname = SWAPL( pname );
    }
    return 4 * __glPointParameterfvEXT_size( pname );
}

int __glXPointParameterivReqSize(GLbyte *pc, Bool swap, int reqlen)
{
    /* no difference between fv and iv versions */
    return __glXPointParameterfvARBReqSize(pc, swap, reqlen);
}