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

 *

 * Copyright 2003 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.

 *

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

#include "main/mtypes.h"

#include "main/enums.h"

#include "main/image.h"

#include "main/teximage.h"

#include "main/texobj.h"

#include "main/texstate.h"

#include "main/fbobject.h"

#include "drivers/common/meta.h"

#include "intel_screen.h"

#include "intel_mipmap_tree.h"

#include "intel_fbo.h"

#include "intel_tex.h"

#include "intel_blit.h"

#include "brw_context.h"

#define FILE_DEBUG_FLAG DEBUG_TEXTURE

static bool

intel_copy_texsubimage(struct brw_context *brw,

                       struct intel_texture_image *intelImage,

                       GLint dstx, GLint dsty, GLint slice,

                       struct intel_renderbuffer *irb,

                       GLint x, GLint y, GLsizei width, GLsizei height)

{

   const GLenum internalFormat = intelImage->base.Base.InternalFormat;

   bool ret;

   intel_prepare_render(brw);

   /* glCopyTexSubImage() can be called on a multisampled renderbuffer (if

    * that renderbuffer is associated with the window system framebuffer),

    * however the hardware blitter can't handle this case, so fall back to

    * meta (which can, since it uses ReadPixels).

    */

   if (irb->Base.Base.NumSamples != 0)

      return false;

   /* glCopyTexSubImage() can't be called on a multisampled texture. */

   assert(intelImage->base.Base.NumSamples == 0);

   if (!intelImage->mt || !irb || !irb->mt) {

      if (unlikely(INTEL_DEBUG & DEBUG_PERF))

	 fprintf(stderr, "%s fail %p %p (0x%08x)\n",

		 __func__, intelImage->mt, irb, internalFormat);

      return false;

   }

   /* account for view parameters and face index */

   int dst_level = intelImage->base.Base.Level +

                   intelImage->base.Base.TexObject->MinLevel;

   int dst_slice = slice + intelImage->base.Base.Face +

                   intelImage->base.Base.TexObject->MinLayer;

   _mesa_unlock_texture(&brw->ctx, intelImage->base.Base.TexObject);

   /* blit from src buffer to texture */

   ret = intel_miptree_blit(brw,

                            irb->mt, irb->mt_level, irb->mt_layer,

                            x, y, irb->Base.Base.Name == 0,

                            intelImage->mt, dst_level, dst_slice,

                            dstx, dsty, false,

                            width, height, GL_COPY);

   _mesa_lock_texture(&brw->ctx, intelImage->base.Base.TexObject);

   return ret;

}

static void

intelCopyTexSubImage(struct gl_context *ctx, GLuint dims,

                     struct gl_texture_image *texImage,

                     GLint xoffset, GLint yoffset, GLint slice,

                     struct gl_renderbuffer *rb,

                     GLint x, GLint y,

                     GLsizei width, GLsizei height)

{

   struct brw_context *brw = brw_context(ctx);

   /* Try BLORP first.  It can handle almost everything. */

   if (brw_blorp_copytexsubimage(brw, rb, texImage, slice, x, y,

                                 xoffset, yoffset, width, height))

      return;

   /* Next, try the BLT engine. */

   if (intel_copy_texsubimage(brw,

                              intel_texture_image(texImage),

                              xoffset, yoffset, slice,

                              intel_renderbuffer(rb), x, y, width, height)) {

      return;

   }

   /* Finally, fall back to meta.  This will likely be slow. */

   perf_debug("%s - fallback to swrast\n", __func__);

   _mesa_meta_CopyTexSubImage(ctx, dims, texImage,

                              xoffset, yoffset, slice,

                              rb, x, y, width, height);

}

void

intelInitTextureCopyImageFuncs(struct dd_function_table *functions)

{

   functions->CopyTexSubImage = intelCopyTexSubImage;

}