xserver/glx/indirect_program.c

/*
 * (C) Copyright IBM Corporation 2005, 2006
 * 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, sub license,
 * 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 and this permission notice (including the next
 * paragraph) 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, THE AUTHORS, AND/OR THEIR SUPPLIERS 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.
 */

/**
 * \file indirect_program.c
 * Hand-coded routines needed to support programmable pipeline extensions.
 *
 * \author Ian Romanick <idr@us.ibm.com>
 */

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

#include "glxserver.h"
#include "glxbyteorder.h"
#include "glxext.h"
#include "singlesize.h"
#include "unpack.h"
#include "indirect_size_get.h"
#include "indirect_dispatch.h"
#include "glapitable.h"
#include "glapi.h"
#include "glthread.h"
#include "dispatch.h"

static int DoGetProgramString(struct __GLXclientStateRec *cl, GLbyte * pc,
                              unsigned get_programiv_offset,
                              unsigned get_program_string_offset, Bool do_swap);

/**
 * Handle both types of glGetProgramString calls.
 *
 * This single function handles both \c glGetProgramStringARB and
 * \c glGetProgramStringNV.  The dispatch offsets for the functions to use
 * for \c glGetProgramivARB and \c glGetProgramStringARB are passed in by the
 * caller.  These can be the offsets of either the ARB versions or the NV
 * versions.
 */
int
DoGetProgramString(struct __GLXclientStateRec *cl, GLbyte * pc,
                   unsigned get_programiv_offset,
                   unsigned get_program_string_offset, Bool do_swap)
{
    xGLXVendorPrivateWithReplyReq *const req =
        (xGLXVendorPrivateWithReplyReq *) pc;
    int error;
    __GLXcontext *const cx = __glXForceCurrent(cl, req->contextTag, &error);
    ClientPtr client = cl->client;

    pc += __GLX_VENDPRIV_HDR_SIZE;
    if (cx != NULL) {
        GLenum target;
        GLenum pname;
        GLint compsize = 0;
        char *answer = NULL, answerBuffer[200];

        if (do_swap) {
            target = (GLenum) bswap_32(*(int *) (pc + 0));
            pname = (GLenum) bswap_32(*(int *) (pc + 4));
        }
        else {
            target = *(GLenum *) (pc + 0);
            pname = *(GLuint *) (pc + 4);
        }

        /* The value of the GL_PROGRAM_LENGTH_ARB and GL_PROGRAM_LENGTH_NV
         * enumerants is the same.
         */
        CALL_by_offset(GET_DISPATCH(),
                       (void (GLAPIENTRYP) (GLuint, GLenum, GLint *)),
                       get_programiv_offset,
                       (target, GL_PROGRAM_LENGTH_ARB, &compsize));

        if (compsize != 0) {
            __GLX_GET_ANSWER_BUFFER(answer, cl, compsize, 1);
            __glXClearErrorOccured();

            CALL_by_offset(GET_DISPATCH(),
                           (void (GLAPIENTRYP) (GLuint, GLenum, GLubyte *)),
                           get_program_string_offset,
                           (target, pname, (GLubyte *) answer));
        }

        if (__glXErrorOccured()) {
            __GLX_BEGIN_REPLY(0);
            __GLX_SEND_HEADER();
        }
        else {
            __GLX_BEGIN_REPLY(compsize);
            ((xGLXGetTexImageReply *) &__glXReply)->width = compsize;
            __GLX_SEND_HEADER();
            __GLX_SEND_VOID_ARRAY(compsize);
        }

        error = Success;
    }

    return error;
}

int
__glXDisp_GetProgramStringARB(struct __GLXclientStateRec *cl, GLbyte * pc)
{
    return DoGetProgramString(cl, pc, _gloffset_GetProgramivARB,
                              _gloffset_GetProgramStringARB, False);
}

int
__glXDispSwap_GetProgramStringARB(struct __GLXclientStateRec *cl, GLbyte * pc)
{
    return DoGetProgramString(cl, pc, _gloffset_GetProgramivARB,
                              _gloffset_GetProgramStringARB, True);
}

int
__glXDisp_GetProgramStringNV(struct __GLXclientStateRec *cl, GLbyte * pc)
{
    return DoGetProgramString(cl, pc, _gloffset_GetProgramivNV,
                              _gloffset_GetProgramStringNV, False);
}

int
__glXDispSwap_GetProgramStringNV(struct __GLXclientStateRec *cl, GLbyte * pc)
{
    return DoGetProgramString(cl, pc, _gloffset_GetProgramivNV,
                              _gloffset_GetProgramStringNV, True);
}