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

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * 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 TUNGSTEN GRAPHICS 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.

 *

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

/**

 * Functions for pixel buffer objects and vertex/element buffer objects.

 */

#include "main/imports.h"

#include "main/mtypes.h"

#include "main/arrayobj.h"

#include "main/bufferobj.h"

#include "st_context.h"

#include "st_cb_bufferobjects.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "util/u_inlines.h"

/**

 * There is some duplication between mesa's bufferobjects and our

 * bufmgr buffers.  Both have an integer handle and a hashtable to

 * lookup an opaque structure.  It would be nice if the handles and

 * internal structure where somehow shared.

 */

static struct gl_buffer_object *

st_bufferobj_alloc(struct gl_context *ctx, GLuint name, GLenum target)

{

   struct st_buffer_object *st_obj = ST_CALLOC_STRUCT(st_buffer_object);

   if (!st_obj)

      return NULL;

   _mesa_initialize_buffer_object(&st_obj->Base, name, target);

   return &st_obj->Base;

}

/**

 * Deallocate/free a vertex/pixel buffer object.

 * Called via glDeleteBuffersARB().

 */

static void

st_bufferobj_free(struct gl_context *ctx, struct gl_buffer_object *obj)

{

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   assert(obj->RefCount == 0);

   assert(st_obj->transfer == NULL);

   if (st_obj->buffer)

      pipe_resource_reference(&st_obj->buffer, NULL);

   free(st_obj);

}

/**

 * Replace data in a subrange of buffer object.  If the data range

 * specified by size + offset extends beyond the end of the buffer or

 * if data is NULL, no copy is performed.

 * Called via glBufferSubDataARB().

 */

static void

st_bufferobj_subdata(struct gl_context *ctx,

		     GLenum target,

		     GLintptrARB offset,

		     GLsizeiptrARB size,

		     const GLvoid * data, struct gl_buffer_object *obj)

{

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   /* we may be called from VBO code, so double-check params here */

   ASSERT(offset >= 0);

   ASSERT(size >= 0);

   ASSERT(offset + size <= obj->Size);

   if (!size)

      return;

   /*

    * According to ARB_vertex_buffer_object specification, if data is null,

    * then the contents of the buffer object's data store is undefined. We just

    * ignore, and leave it unchanged.

    */

   if (!data)

      return;

   /* Now that transfers are per-context, we don't have to figure out

    * flushing here.  Usually drivers won't need to flush in this case

    * even if the buffer is currently referenced by hardware - they

    * just queue the upload as dma rather than mapping the underlying

    * buffer directly.

    */

   pipe_buffer_write(st_context(ctx)->pipe,

		     st_obj->buffer,

		     offset, size, data);

}

/**

 * Called via glGetBufferSubDataARB().

 */

static void

st_bufferobj_get_subdata(struct gl_context *ctx,

                         GLenum target,

                         GLintptrARB offset,

                         GLsizeiptrARB size,

                         GLvoid * data, struct gl_buffer_object *obj)

{

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   /* we may be called from VBO code, so double-check params here */

   ASSERT(offset >= 0);

   ASSERT(size >= 0);

   ASSERT(offset + size <= obj->Size);

   if (!size)

      return;

   pipe_buffer_read(st_context(ctx)->pipe, st_obj->buffer,

                    offset, size, data);

}

/**

 * Allocate space for and store data in a buffer object.  Any data that was

 * previously stored in the buffer object is lost.  If data is NULL,

 * memory will be allocated, but no copy will occur.

 * Called via ctx->Driver.BufferData().

 * \return GL_TRUE for success, GL_FALSE if out of memory

 */

static GLboolean

st_bufferobj_data(struct gl_context *ctx,

		  GLenum target,

		  GLsizeiptrARB size,

		  const GLvoid * data,

		  GLenum usage,

		  struct gl_buffer_object *obj)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   unsigned buffer_usage;

   st_obj->Base.Size = size;

   st_obj->Base.Usage = usage;

   switch(target) {

   case GL_PIXEL_PACK_BUFFER_ARB:

   case GL_PIXEL_UNPACK_BUFFER_ARB:

      buffer_usage = PIPE_BIND_RENDER_TARGET;

      break;

   case GL_ARRAY_BUFFER_ARB:

      buffer_usage = PIPE_BIND_VERTEX_BUFFER;

      break;

   case GL_ELEMENT_ARRAY_BUFFER_ARB:

      buffer_usage = PIPE_BIND_INDEX_BUFFER;

      break;

   default:

      buffer_usage = 0;

   }

   pipe_resource_reference( &st_obj->buffer, NULL );

   if (size != 0) {

      st_obj->buffer = pipe_buffer_create(pipe->screen, buffer_usage, size);

      if (!st_obj->buffer) {

         return GL_FALSE;

      }

      if (data)

         pipe_buffer_write(st_context(ctx)->pipe, st_obj->buffer, 0,

				       size, data);

      return GL_TRUE;

   }

   return GL_TRUE;

}

/**

 * Dummy data whose's pointer is used for zero size buffers or ranges.

 */

static long st_bufferobj_zero_length = 0;

/**

 * Called via glMapBufferARB().

 */

static void *

st_bufferobj_map(struct gl_context *ctx, GLenum target, GLenum access,

                 struct gl_buffer_object *obj)

{

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   uint flags;

   switch (access) {

   case GL_WRITE_ONLY:

      flags = PIPE_TRANSFER_WRITE;

      break;

   case GL_READ_ONLY:

      flags = PIPE_TRANSFER_READ;

      break;

   case GL_READ_WRITE:

   default:

      flags = PIPE_TRANSFER_READ_WRITE;

      break;

   }

   /* Handle zero-size buffers here rather than in drivers */

   if (obj->Size == 0) {

      obj->Pointer = &st_bufferobj_zero_length;

   }

   else {

      obj->Pointer = pipe_buffer_map(st_context(ctx)->pipe,

                                     st_obj->buffer,

                                     flags,

                                     &st_obj->transfer);

   }

   if (obj->Pointer) {

      obj->Offset = 0;

      obj->Length = obj->Size;

   }

   return obj->Pointer;

}

/**

 * Called via glMapBufferRange().

 */

static void *

st_bufferobj_map_range(struct gl_context *ctx, GLenum target,

                       GLintptr offset, GLsizeiptr length, GLbitfield access,

                       struct gl_buffer_object *obj)

{

   struct pipe_context *pipe = st_context(ctx)->pipe;

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   enum pipe_transfer_usage flags = 0x0;

   if (access & GL_MAP_WRITE_BIT)

      flags |= PIPE_TRANSFER_WRITE;

   if (access & GL_MAP_READ_BIT)

      flags |= PIPE_TRANSFER_READ;

   if (access & GL_MAP_FLUSH_EXPLICIT_BIT)

      flags |= PIPE_TRANSFER_FLUSH_EXPLICIT;

   if (access & GL_MAP_INVALIDATE_RANGE_BIT)

      flags |= PIPE_TRANSFER_DISCARD;

   if (access & GL_MAP_INVALIDATE_BUFFER_BIT)

      flags |= PIPE_TRANSFER_DISCARD;

   if (access & GL_MAP_UNSYNCHRONIZED_BIT)

      flags |= PIPE_TRANSFER_UNSYNCHRONIZED;

   /* ... other flags ...

    */

   if (access & MESA_MAP_NOWAIT_BIT)

      flags |= PIPE_TRANSFER_DONTBLOCK;

   assert(offset >= 0);

   assert(length >= 0);

   assert(offset < obj->Size);

   assert(offset + length <= obj->Size);

   /*

    * We go out of way here to hide the degenerate yet valid case of zero

    * length range from the pipe driver.

    */

   if (!length) {

      obj->Pointer = &st_bufferobj_zero_length;

   }

   else {

      obj->Pointer = pipe_buffer_map_range(pipe,

                                           st_obj->buffer,

                                           offset, length,

                                           flags,

                                           &st_obj->transfer);

      if (obj->Pointer) {

         obj->Pointer = (ubyte *) obj->Pointer + offset;

      }

   }

   if (obj->Pointer) {

      obj->Offset = offset;

      obj->Length = length;

      obj->AccessFlags = access;

   }

   return obj->Pointer;

}

static void

st_bufferobj_flush_mapped_range(struct gl_context *ctx, GLenum target,

                                GLintptr offset, GLsizeiptr length,

                                struct gl_buffer_object *obj)

{

   struct pipe_context *pipe = st_context(ctx)->pipe;

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   /* Subrange is relative to mapped range */

   assert(offset >= 0);

   assert(length >= 0);

   assert(offset + length <= obj->Length);

   assert(obj->Pointer);

   if (!length)

      return;

   pipe_buffer_flush_mapped_range(pipe, st_obj->transfer,

                                  obj->Offset + offset, length);

}

/**

 * Called via glUnmapBufferARB().

 */

static GLboolean

st_bufferobj_unmap(struct gl_context *ctx, GLenum target, struct gl_buffer_object *obj)

{

   struct pipe_context *pipe = st_context(ctx)->pipe;

   struct st_buffer_object *st_obj = st_buffer_object(obj);

   if (obj->Length)

      pipe_buffer_unmap(pipe, st_obj->buffer, st_obj->transfer);

   st_obj->transfer = NULL;

   obj->Pointer = NULL;

   obj->Offset = 0;

   obj->Length = 0;

   return GL_TRUE;

}

/**

 * Called via glCopyBufferSubData().

 */

static void

st_copy_buffer_subdata(struct gl_context *ctx,

                       struct gl_buffer_object *src,

                       struct gl_buffer_object *dst,

                       GLintptr readOffset, GLintptr writeOffset,

                       GLsizeiptr size)

{

   struct pipe_context *pipe = st_context(ctx)->pipe;

   struct st_buffer_object *srcObj = st_buffer_object(src);

   struct st_buffer_object *dstObj = st_buffer_object(dst);

   struct pipe_transfer *src_transfer;

   struct pipe_transfer *dst_transfer;

   ubyte *srcPtr, *dstPtr;

   if(!size)

      return;

   /* buffer should not already be mapped */

   assert(!src->Pointer);

   assert(!dst->Pointer);

   srcPtr = (ubyte *) pipe_buffer_map_range(pipe,

                                            srcObj->buffer,

                                            readOffset, size,

                                            PIPE_TRANSFER_READ,

					    &src_transfer);

   dstPtr = (ubyte *) pipe_buffer_map_range(pipe,

                                            dstObj->buffer,

                                            writeOffset, size,

                                            PIPE_TRANSFER_WRITE,

					    &dst_transfer);

   if (srcPtr && dstPtr)

      memcpy(dstPtr + writeOffset, srcPtr + readOffset, size);

   pipe_buffer_unmap(pipe, srcObj->buffer, src_transfer);

   pipe_buffer_unmap(pipe, dstObj->buffer, dst_transfer);

}

/* TODO: if buffer wasn't created with appropriate usage flags, need

 * to recreate it now and copy contents -- or possibly create a

 * gallium entrypoint to extend the usage flags and let the driver

 * decide if a copy is necessary.

 */

void

st_bufferobj_validate_usage(struct st_context *st,

			    struct st_buffer_object *obj,

			    unsigned usage)

{

}

void

st_init_bufferobject_functions(struct dd_function_table *functions)

{

   functions->NewBufferObject = st_bufferobj_alloc;

   functions->DeleteBuffer = st_bufferobj_free;

   functions->BufferData = st_bufferobj_data;

   functions->BufferSubData = st_bufferobj_subdata;

   functions->GetBufferSubData = st_bufferobj_get_subdata;

   functions->MapBuffer = st_bufferobj_map;

   functions->MapBufferRange = st_bufferobj_map_range;

   functions->FlushMappedBufferRange = st_bufferobj_flush_mapped_range;

   functions->UnmapBuffer = st_bufferobj_unmap;

   functions->CopyBufferSubData = st_copy_buffer_subdata;

   /* For GL_APPLE_vertex_array_object */

   functions->NewArrayObject = _mesa_new_array_object;

   functions->DeleteArrayObject = _mesa_delete_array_object;

}