OpenGL/packer/pack_bounds.c

/* Copyright (c) 2001, Stanford University
 * All rights reserved
 *
 * See the file LICENSE.txt for information on redistributing this software.
 */

#include "packer.h"
#include "cr_opcodes.h"
#include "cr_mem.h"

void PACK_APIENTRY crPackBoundsInfoCR( CR_PACKER_CONTEXT_ARGDECL const CRrecti *bounds, const GLbyte *payload, GLint len, GLint num_opcodes )
{
    CR_GET_PACKER_CONTEXT(pc);
    /* Don't get the buffered_ptr here because we've already
     * verified that there's enough space for everything. */

    unsigned char *data_ptr;
    int len_aligned, total_len;

    CR_LOCK_PACKER_CONTEXT(pc);

    data_ptr = pc->buffer.data_current;
    len_aligned     = ( len + 0x3 ) & ~0x3;
    total_len = 24 + len_aligned;

    WRITE_DATA( 0, int, total_len );
    WRITE_DATA( 4, int, bounds->x1 );
    WRITE_DATA( 8, int, bounds->y1 );
    WRITE_DATA( 12, int, bounds->x2 );
    WRITE_DATA( 16, int, bounds->y2 );
    WRITE_DATA( 20, int, num_opcodes );

    /* skip the BOUNDSINFO */
    data_ptr += 24;

    /* put in padding opcodes (deliberately bogus) */
    switch ( len_aligned - len )
    {
      case 3: *data_ptr++ = 0xff; /* FALLTHROUGH */
      case 2: *data_ptr++ = 0xff; /* FALLTHROUGH */
      case 1: *data_ptr++ = 0xff; /* FALLTHROUGH */
      default: break;
    }

    crMemcpy( data_ptr, payload, len );

    WRITE_OPCODE( pc, CR_BOUNDSINFOCR_OPCODE );
    pc->buffer.data_current += 24 + len_aligned;
    CR_UNLOCK_PACKER_CONTEXT(pc);
}