glxreply.c   [plain text]

/*
 * (C) Copyright Apple Inc. 2008
 * (C) Copyright IBM Corporation 2004, 2005
 * 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
 * IBM,
 * 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.
 */

#include <GL/gl.h>
#include "glxclient.h"
#include <GL/glxproto.h>

CARD32 __glXReadReply(Display * dpy, size_t size, void *dest,
		      GLboolean reply_is_always_array) {
    xGLXSingleReply reply;
    
    (void) _XReply(dpy, (xReply *) & reply, 0, False);
    if (size != 0) {
        if ((reply.length > 0) || reply_is_always_array) {
            const GLint bytes = (reply_is_always_array)
                ? (4 * reply.length) : (reply.size * size);
            const GLint extra = 4 - (bytes & 3);

            _XRead(dpy, dest, bytes);
            if (extra < 4) {
                _XEatData(dpy, extra);
            }
        } else {
            (void) memcpy(dest, &(reply.pad3), size);
        }
    }

    return reply.retval;
}

void __glXReadPixelReply(Display * dpy, __GLXcontext * gc, unsigned max_dim,
                    GLint width, GLint height, GLint depth, GLenum format,
                    GLenum type, void *dest, GLboolean dimensions_in_reply) {
    xGLXSingleReply reply;
    GLint size;

    (void) _XReply(dpy, (xReply *) & reply, 0, False);

    if (dimensions_in_reply) {
        width = reply.pad3;
        height = reply.pad4;
        depth = reply.pad5;

        if ((height == 0) || (max_dim < 2)) {
            height = 1;
        }
        if ((depth == 0) || (max_dim < 3)) {
            depth = 1;
        }
    }

    size = reply.length * 4;
    if (size != 0) {
        void *buf = Xmalloc(size);

        if (buf == NULL) {
            _XEatData(dpy, size);
            __glXSetError(gc, GL_OUT_OF_MEMORY);
        } else {
            const GLint extra = 4 - (size & 3);

            _XRead(dpy, buf, size);
            if (extra < 4) {
                _XEatData(dpy, extra);
            }

            __glEmptyImage(gc, 3, width, height, depth, format, type,
                           buf, dest);
            Xfree(buf);
        }
    }
}

#if 0
GLubyte * __glXSetupSingleRequest(__GLXcontext * gc, GLint sop, GLint cmdlen) {
    xGLXSingleReq *req;
    Display *const dpy = gc->currentDpy;

    (void) __glXFlushRenderBuffer(gc, gc->pc);
    LockDisplay(dpy);
    GetReqExtra(GLXSingle, cmdlen, req);
    req->reqType = gc->majorOpcode;
    req->contextTag = gc->currentContextTag;
    req->glxCode = sop;
    return (GLubyte *) (req) + sz_xGLXSingleReq;
}
#endif

GLubyte *__glXSetupVendorRequest(__GLXcontext * gc, GLint code, GLint vop,
                        GLint cmdlen) {
    xGLXVendorPrivateReq *req;
    Display *const dpy = gc->currentDpy;

    (void) __glXFlushRenderBuffer(gc, gc->pc);
    LockDisplay(dpy);
    GetReqExtra(GLXVendorPrivate, cmdlen, req);
    req->reqType = gc->majorOpcode;
    req->glxCode = code;
    req->vendorCode = vop;
    req->contextTag = gc->currentContextTag;
    return (GLubyte *) (req) + sz_xGLXVendorPrivateReq;
}