src/gallium/drivers/svga/svga_resource_buffer.h

/**********************************************************
 * Copyright 2008-2009 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, 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 and this permission notice 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 THE AUTHORS OR COPYRIGHT HOLDERS
 * 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.
 *
 **********************************************************/

#ifndef SVGA_BUFFER_H
#define SVGA_BUFFER_H


#include "pipe/p_compiler.h"
#include "pipe/p_state.h"
#include "util/u_transfer.h"

#include "util/u_double_list.h"

#include "svga_screen_cache.h"


/**
 * Maximum number of discontiguous ranges
 */
#define SVGA_BUFFER_MAX_RANGES 32


struct svga_screen;
struct svga_context;
struct svga_winsys_buffer;
struct svga_winsys_surface;


extern struct u_resource_vtbl svga_buffer_vtbl;

struct svga_buffer_range
{
   unsigned start;
   unsigned end;
};


/**
 * SVGA pipe buffer.
 */
struct svga_buffer 
{
   struct u_resource b;

   /**
    * Regular (non DMA'able) memory.
    * 
    * Used for user buffers or for buffers which we know before hand that can
    * never be used by the virtual hardware directly, such as constant buffers.
    */
   void *swbuf;
   
   /** 
    * Whether swbuf was created by the user or not.
    */
   boolean user;
   
   /**
    * Creation key for the host surface handle.
    * 
    * This structure describes all the host surface characteristics so that it 
    * can be looked up in cache, since creating a host surface is often a slow
    * operation.
    */
   struct svga_host_surface_cache_key key;
   
   /**
    * Host surface handle.
    * 
    * This is a platform independent abstraction for host SID. We create when 
    * trying to bind.
    *
    * Only set for non-user buffers.
    */
   struct svga_winsys_surface *handle;

   /**
    * Information about ongoing and past map operations.
    */
   struct {
      /**
       * Number of concurrent mappings.
       */
      unsigned count;

      /**
       * Dirty ranges.
       *
       * Ranges that were touched by the application and need to be uploaded to
       * the host.
       *
       * This information will be copied into dma.boxes, when emiting the
       * SVGA3dCmdSurfaceDMA command.
       */
      struct svga_buffer_range ranges[SVGA_BUFFER_MAX_RANGES];
      unsigned num_ranges;
   } map;

   /**
    * Information about uploaded version of user buffers.
    */
   struct {
      struct pipe_resource *buffer;

      /**
       * We combine multiple user buffers into the same hardware buffer. This
       * is the relative offset within that buffer.
       */
      unsigned offset;
   } uploaded;

   /**
    * For user buffers, this is the offset to the data about to be
    * referenced by the next draw command, and hence the data that needs
    * to be uploaded.
    */
   unsigned source_offset;

   /**
    * DMA'ble memory.
    *
    * A piece of GMR memory, with the same size of the buffer. It is created
    * when mapping the buffer, and will be used to upload vertex data to the
    * host.
    *
    * Only set for non-user buffers.
    */
   struct svga_winsys_buffer *hwbuf;

   /**
    * Information about pending DMA uploads.
    *
    */
   struct {
      /**
       * Whether this buffer has an unfinished DMA upload command.
       *
       * If not set then the rest of the information is null.
       */
      boolean pending;

      SVGA3dSurfaceDMAFlags flags;

      /**
       * Pointer to the DMA copy box *inside* the command buffer.
       */
      SVGA3dCopyBox *boxes;

      /**
       * Context that has the pending DMA to this buffer.
       */
      struct svga_context *svga;
   } dma;

   /**
    * Linked list head, used to gather all buffers with pending dma uploads on
    * a context. It is only valid if the dma.pending is set above.
    */
   struct list_head head;
};


static INLINE struct svga_buffer *
svga_buffer(struct pipe_resource *buffer)
{
   if (buffer) {
      assert(((struct svga_buffer *)buffer)->b.vtbl == &svga_buffer_vtbl);
      return (struct svga_buffer *)buffer;
   }
   return NULL;
}


/**
 * Returns TRUE for user buffers.  We may
 * decide to use an alternate upload path for these buffers.
 */
static INLINE boolean 
svga_buffer_is_user_buffer( struct pipe_resource *buffer )
{
   return svga_buffer(buffer)->user;
}




struct pipe_resource *
svga_user_buffer_create(struct pipe_screen *screen,
                        void *ptr,
                        unsigned bytes,
			unsigned usage);

struct pipe_resource *
svga_buffer_create(struct pipe_screen *screen,
		   const struct pipe_resource *template);



/**
 * Get the host surface handle for this buffer.
 *
 * This will ensure the host surface is updated, issuing DMAs as needed.
 *
 * NOTE: This may insert new commands in the context, so it *must* be called
 * before reserving command buffer space. And, in order to insert commands
 * it may need to call svga_context_flush().
 */
struct svga_winsys_surface *
svga_buffer_handle(struct svga_context *svga,
                   struct pipe_resource *buf);

void
svga_context_flush_buffers(struct svga_context *svga);

struct svga_winsys_buffer *
svga_winsys_buffer_create(struct svga_context *svga,
                          unsigned alignment, 
                          unsigned usage,
                          unsigned size);

void
svga_redefine_user_buffer(struct pipe_context *ctx,
                          struct pipe_resource *resource,
                          unsigned offset,
                          unsigned size);

#endif /* SVGA_BUFFER_H */