clientattrib.c

来自「Mesa is an open-source implementation of」· C语言 代码 · 共 136 行

/*
 * 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 <assert.h>
#include "glxclient.h"
#include "indirect.h"
#include "indirect_vertex_array.h"

/*****************************************************************************/

static void
do_enable_disable(GLenum array, GLboolean val )
{
    __GLXcontext *gc = __glXGetCurrentContext();
    __GLXattribute * state = (__GLXattribute *)(gc->client_state_private);
    unsigned index = 0;

    if ( array == GL_TEXTURE_COORD_ARRAY ) {
	index = __glXGetActiveTextureUnit( state );
    }

    if ( ! __glXSetArrayEnable( state, array, index, val ) ) {
	__glXSetError(gc, GL_INVALID_ENUM);
    }
}

void __indirect_glEnableClientState(GLenum array)
{
    do_enable_disable( array, GL_TRUE );
}

void __indirect_glDisableClientState(GLenum array)
{
    do_enable_disable( array, GL_FALSE );
}

/************************************************************************/

void __indirect_glPushClientAttrib(GLuint mask)
{
    __GLXcontext *gc = __glXGetCurrentContext();
    __GLXattribute * state = (__GLXattribute *)(gc->client_state_private);
    __GLXattribute **spp = gc->attributes.stackPointer, *sp;

    if (spp < &gc->attributes.stack[__GL_CLIENT_ATTRIB_STACK_DEPTH]) {
	if (!(sp = *spp)) {
	    sp = (__GLXattribute *)Xmalloc(sizeof(__GLXattribute));
	    *spp = sp;
	}
	sp->mask = mask;
	gc->attributes.stackPointer = spp + 1;
	if (mask & GL_CLIENT_PIXEL_STORE_BIT) {
	    sp->storePack = state->storePack;
	    sp->storeUnpack = state->storeUnpack;
	}
	if (mask & GL_CLIENT_VERTEX_ARRAY_BIT) {
	    __glXPushArrayState( state );
	}
    } else {
	__glXSetError(gc, GL_STACK_OVERFLOW);
	return;
    }
}

void __indirect_glPopClientAttrib(void)
{
    __GLXcontext *gc = __glXGetCurrentContext();
    __GLXattribute * state = (__GLXattribute *)(gc->client_state_private);
    __GLXattribute **spp = gc->attributes.stackPointer, *sp;
    GLuint mask;

    if (spp > &gc->attributes.stack[0]) {
	--spp;
	sp = *spp;
	assert(sp != 0);
	mask = sp->mask;
	gc->attributes.stackPointer = spp;

	if (mask & GL_CLIENT_PIXEL_STORE_BIT) {
	    state->storePack = sp->storePack;
	    state->storeUnpack = sp->storeUnpack;
	}
	if (mask & GL_CLIENT_VERTEX_ARRAY_BIT) {
	    __glXPopArrayState( state );
	}

	sp->mask = 0;
    } else {
	__glXSetError(gc, GL_STACK_UNDERFLOW);
	return;
    }
}

void __glFreeAttributeState(__GLXcontext *gc)
{
    __GLXattribute *sp, **spp;

    for (spp = &gc->attributes.stack[0];
         spp < &gc->attributes.stack[__GL_CLIENT_ATTRIB_STACK_DEPTH];
	 spp++) {
	sp = *spp;
        if (sp) {
            XFree((char *)sp);
        } else {
            break;
	}
    }
}