/**************************************************************************
 *
 * Copyright 2006 VMware, 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, 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 VMWARE AND/OR ITS 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
 * Buffer manager using the old texture memory manager.
 * 
 * \author Jose Fonseca <jfonseca@vmware.com>
 */


#include "pipe/p_defines.h"
#include "util/u_debug.h"
#include "os/os_thread.h"
#include "util/u_memory.h"
#include "util/list.h"
#include "util/u_mm.h"
#include "pb_buffer.h"
#include "pb_bufmgr.h"


/**
 * Convenience macro (type safe).
 */
#define SUPER(__derived) (&(__derived)->base)


struct mm_pb_manager
{
   struct pb_manager base;
   
   mtx_t mutex;
   
   pb_size size;
   struct mem_block *heap;
   
   pb_size align2;
   
   struct pb_buffer *buffer;
   void *map;
};


static inline struct mm_pb_manager *
mm_pb_manager(struct pb_manager *mgr)
{
   assert(mgr);
   return (struct mm_pb_manager *)mgr;
}


struct mm_buffer
{
   struct pb_buffer base;
   
   struct mm_pb_manager *mgr;
   
   struct mem_block *block;
};


static inline struct mm_buffer *
mm_buffer(struct pb_buffer *buf)
{
   assert(buf);
   return (struct mm_buffer *)buf;
}


static void
mm_buffer_destroy(void *winsys, struct pb_buffer *buf)
{
   struct mm_buffer *mm_buf = mm_buffer(buf);
   struct mm_pb_manager *mm = mm_buf->mgr;
   
   assert(!pipe_is_referenced(&mm_buf->base.reference));
   
   mtx_lock(&mm->mutex);
   u_mmFreeMem(mm_buf->block);
   FREE(mm_buf);
   mtx_unlock(&mm->mutex);
}


static void *
mm_buffer_map(struct pb_buffer *buf,
              enum pb_usage_flags flags,
              void *flush_ctx)
{
   struct mm_buffer *mm_buf = mm_buffer(buf);
   struct mm_pb_manager *mm = mm_buf->mgr;

   /* XXX: it will be necessary to remap here to propagate flush_ctx */

   return (unsigned char *) mm->map + mm_buf->block->ofs;
}


static void
mm_buffer_unmap(struct pb_buffer *buf)
{
   /* No-op */
}


static enum pipe_error 
mm_buffer_validate(struct pb_buffer *buf, 
                   struct pb_validate *vl,
                   enum pb_usage_flags flags)
{
   struct mm_buffer *mm_buf = mm_buffer(buf);
   struct mm_pb_manager *mm = mm_buf->mgr;
   return pb_validate(mm->buffer, vl, flags);
}


static void
mm_buffer_fence(struct pb_buffer *buf, 
                struct pipe_fence_handle *fence)
{
   struct mm_buffer *mm_buf = mm_buffer(buf);
   struct mm_pb_manager *mm = mm_buf->mgr;
   pb_fence(mm->buffer, fence);
}


static void
mm_buffer_get_base_buffer(struct pb_buffer *buf,
                          struct pb_buffer **base_buf,
                          pb_size *offset)
{
   struct mm_buffer *mm_buf = mm_buffer(buf);
   struct mm_pb_manager *mm = mm_buf->mgr;
   pb_get_base_buffer(mm->buffer, base_buf, offset);
   *offset += mm_buf->block->ofs;
}


static const struct pb_vtbl 
mm_buffer_vtbl = {
      mm_buffer_destroy,
      mm_buffer_map,
      mm_buffer_unmap,
      mm_buffer_validate,
      mm_buffer_fence,
      mm_buffer_get_base_buffer
};


static struct pb_buffer *
mm_bufmgr_create_buffer(struct pb_manager *mgr, 
                        pb_size size,
                        const struct pb_desc *desc)
{
   struct mm_pb_manager *mm = mm_pb_manager(mgr);
   struct mm_buffer *mm_buf;

   /* We don't handle alignments larger then the one initially setup */
   assert(pb_check_alignment(desc->alignment, 1u << mm->align2));
   if(!pb_check_alignment(desc->alignment, 1u << mm->align2))
      return NULL;
   
   mtx_lock(&mm->mutex);

   mm_buf = CALLOC_STRUCT(mm_buffer);
   if (!mm_buf) {
      mtx_unlock(&mm->mutex);
      return NULL;
   }

   pipe_reference_init(&mm_buf->base.reference, 1);
   mm_buf->base.alignment_log2 = util_logbase2(desc->alignment);
   mm_buf->base.usage = desc->usage;
   mm_buf->base.size = size;
   
   mm_buf->base.vtbl = &mm_buffer_vtbl;
   
   mm_buf->mgr = mm;
   
   mm_buf->block = u_mmAllocMem(mm->heap, (int)size, (int)mm->align2, 0);
   if(!mm_buf->block) {
#if 0
      debug_printf("warning: heap full\n");
      mmDumpMemInfo(mm->heap);
#endif
      FREE(mm_buf);
      mtx_unlock(&mm->mutex);
      return NULL;
   }
   
   /* Some sanity checks */
   assert(0 <= (pb_size)mm_buf->block->ofs && (pb_size)mm_buf->block->ofs < mm->size);
   assert(size <= (pb_size)mm_buf->block->size && (pb_size)mm_buf->block->ofs + (pb_size)mm_buf->block->size <= mm->size);
   
   mtx_unlock(&mm->mutex);
   return SUPER(mm_buf);
}


static void
mm_bufmgr_flush(struct pb_manager *mgr)
{
   /* No-op */
}


static void
mm_bufmgr_destroy(struct pb_manager *mgr)
{
   struct mm_pb_manager *mm = mm_pb_manager(mgr);
   
   mtx_lock(&mm->mutex);

   u_mmDestroy(mm->heap);
   
   pb_unmap(mm->buffer);
   pb_reference(&mm->buffer, NULL);
   
   mtx_unlock(&mm->mutex);
   
   FREE(mgr);
}


struct pb_manager *
mm_bufmgr_create_from_buffer(struct pb_buffer *buffer, 
                             pb_size size, pb_size align2) 
{
   struct mm_pb_manager *mm;

   if (!buffer)
      return NULL;
   
   mm = CALLOC_STRUCT(mm_pb_manager);
   if (!mm)
      return NULL;

   mm->base.destroy = mm_bufmgr_destroy;
   mm->base.create_buffer = mm_bufmgr_create_buffer;
   mm->base.flush = mm_bufmgr_flush;

   mm->size = size;
   mm->align2 = align2; /* 64-byte alignment */

   (void) mtx_init(&mm->mutex, mtx_plain);

   mm->buffer = buffer; 

   mm->map = pb_map(mm->buffer, 
		    PB_USAGE_CPU_READ |
		    PB_USAGE_CPU_WRITE, NULL);
   if(!mm->map)
      goto failure;

   mm->heap = u_mmInit(0, (int)size); 
   if (!mm->heap)
      goto failure;

   return SUPER(mm);
   
failure:
   if(mm->heap)
      u_mmDestroy(mm->heap);
   if(mm->map)
      pb_unmap(mm->buffer);
   FREE(mm);
   return NULL;
}


struct pb_manager *
mm_bufmgr_create(struct pb_manager *provider, 
                 pb_size size, pb_size align2) 
{
   struct pb_buffer *buffer;
   struct pb_manager *mgr;
   struct pb_desc desc;

   if (!provider)
      return NULL;
   
   memset(&desc, 0, sizeof(desc));
   desc.alignment = 1 << align2;
   
   buffer = provider->create_buffer(provider, size, &desc); 
   if (!buffer)
      return NULL;
   
   mgr = mm_bufmgr_create_from_buffer(buffer, size, align2);
   if (!mgr) {
      pb_reference(&buffer, NULL);
      return NULL;
   }

  return mgr;
}
