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/*

 * Mesa 3-D graphics library

 *

 * Copyright (C) 2014 Intel Corporation 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.

 *

 * Authors:

 *    Jason Ekstrand 

 */

#include "intel_tex.h"

#include "intel_blit.h"

#include "intel_mipmap_tree.h"

#include "main/formats.h"

#include "drivers/common/meta.h"

static bool

copy_image_with_blitter(struct brw_context *brw,

                        struct intel_mipmap_tree *src_mt, int src_level,

                        int src_x, int src_y, int src_z,

                        struct intel_mipmap_tree *dst_mt, int dst_level,

                        int dst_x, int dst_y, int dst_z,

                        int src_width, int src_height)

{

   GLuint bw, bh;

   uint32_t src_image_x, src_image_y, dst_image_x, dst_image_y;

   int cpp;

   /* The blitter doesn't understand multisampling at all. */

   if (src_mt->num_samples > 0 || dst_mt->num_samples > 0)

      return false;

   /* According to the Ivy Bridge PRM, Vol1 Part4, section 1.2.1.2 (Graphics

    * Data Size Limitations):

    *

    *    The BLT engine is capable of transferring very large quantities of

    *    graphics data. Any graphics data read from and written to the

    *    destination is permitted to represent a number of pixels that

    *    occupies up to 65,536 scan lines and up to 32,768 bytes per scan line

    *    at the destination. The maximum number of pixels that may be

    *    represented per scan line’s worth of graphics data depends on the

    *    color depth.

    *

    * Furthermore, intelEmitCopyBlit (which is called below) uses a signed

    * 16-bit integer to represent buffer pitch, so it can only handle buffer

    * pitches < 32k.

    *

    * As a result of these two limitations, we can only use the blitter to do

    * this copy when the miptree's pitch is less than 32k.

    */

   if (src_mt->pitch >= 32768 ||

       dst_mt->pitch >= 32768) {

      perf_debug("Falling back due to >=32k pitch\n");

      return false;

   }

   intel_miptree_get_image_offset(src_mt, src_level, src_z,

                                  &src_image_x, &src_image_y);

   if (_mesa_is_format_compressed(src_mt->format)) {

      _mesa_get_format_block_size(src_mt->format, &bw, &bh);

      assert(src_x % bw == 0);

      assert(src_y % bh == 0);

      assert(src_width % bw == 0);

      assert(src_height % bh == 0);

      src_x /= (int)bw;

      src_y /= (int)bh;

      src_width /= (int)bw;

      src_height /= (int)bh;

      /* Inside of the miptree, the x offsets are stored in pixels while

       * the y offsets are stored in blocks.  We need to scale just the x

       * offset.

       */

      src_image_x /= bw;

      cpp = _mesa_get_format_bytes(src_mt->format);

   } else {

      cpp = src_mt->cpp;

   }

   src_x += src_image_x;

   src_y += src_image_y;

   intel_miptree_get_image_offset(dst_mt, dst_level, dst_z,

                                  &dst_image_x, &dst_image_y);

   if (_mesa_is_format_compressed(dst_mt->format)) {

      _mesa_get_format_block_size(dst_mt->format, &bw, &bh);

      assert(dst_x % bw == 0);

      assert(dst_y % bh == 0);

      dst_x /= (int)bw;

      dst_y /= (int)bh;

      /* Inside of the miptree, the x offsets are stored in pixels while

       * the y offsets are stored in blocks.  We need to scale just the x

       * offset.

       */

      dst_image_x /= bw;

   }

   dst_x += dst_image_x;

   dst_y += dst_image_y;

   return intelEmitCopyBlit(brw,

                            cpp,

                            src_mt->pitch,

                            src_mt->bo, src_mt->offset,

                            src_mt->tiling,

                            dst_mt->pitch,

                            dst_mt->bo, dst_mt->offset,

                            dst_mt->tiling,

                            src_x, src_y,

                            dst_x, dst_y,

                            src_width, src_height,

                            GL_COPY);

}

static void

copy_image_with_memcpy(struct brw_context *brw,

                       struct intel_mipmap_tree *src_mt, int src_level,

                       int src_x, int src_y, int src_z,

                       struct intel_mipmap_tree *dst_mt, int dst_level,

                       int dst_x, int dst_y, int dst_z,

                       int src_width, int src_height)

{

   bool same_slice;

   void *mapped, *src_mapped, *dst_mapped;

   ptrdiff_t src_stride, dst_stride, cpp;

   int map_x1, map_y1, map_x2, map_y2;

   GLuint src_bw, src_bh;

   cpp = _mesa_get_format_bytes(src_mt->format);

   _mesa_get_format_block_size(src_mt->format, &src_bw, &src_bh);

   assert(src_width % src_bw == 0);

   assert(src_height % src_bw == 0);

   assert(src_x % src_bw == 0);

   assert(src_y % src_bw == 0);

   /* If we are on the same miptree, same level, and same slice, then

    * intel_miptree_map won't let us map it twice.  We have to do things a

    * bit differently.  In particular, we do a single map large enough for

    * both portions and in read-write mode.

    */

   same_slice = src_mt == dst_mt && src_level == dst_level && src_z == dst_z;

   if (same_slice) {

      assert(dst_x % src_bw == 0);

      assert(dst_y % src_bw == 0);

      map_x1 = MIN2(src_x, dst_x);

      map_y1 = MIN2(src_y, dst_y);

      map_x2 = MAX2(src_x, dst_x) + src_width;

      map_y2 = MAX2(src_y, dst_y) + src_height;

      intel_miptree_map(brw, src_mt, src_level, src_z,

                        map_x1, map_y1, map_x2 - map_x1, map_y2 - map_y1,

                        GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,

                        &mapped, &src_stride);

      dst_stride = src_stride;

      /* Set the offsets here so we don't have to think about while looping */

      src_mapped = mapped + ((src_y - map_y1) / src_bh) * src_stride +

                            ((src_x - map_x1) / src_bw) * cpp;

      dst_mapped = mapped + ((dst_y - map_y1) / src_bh) * dst_stride +

                            ((dst_x - map_x1) / src_bw) * cpp;

   } else {

      intel_miptree_map(brw, src_mt, src_level, src_z,

                        src_x, src_y, src_width, src_height,

                        GL_MAP_READ_BIT, &src_mapped, &src_stride);

      intel_miptree_map(brw, dst_mt, dst_level, dst_z,

                        dst_x, dst_y, src_width, src_height,

                        GL_MAP_WRITE_BIT, &dst_mapped, &dst_stride);

   }

   src_width /= (int)src_bw;

   src_height /= (int)src_bh;

   for (int i = 0; i < src_height; ++i) {

      memcpy(dst_mapped, src_mapped, src_width * cpp);

      src_mapped += src_stride;

      dst_mapped += dst_stride;

   }

   if (same_slice) {

      intel_miptree_unmap(brw, src_mt, src_level, src_z);

   } else {

      intel_miptree_unmap(brw, dst_mt, dst_level, dst_z);

      intel_miptree_unmap(brw, src_mt, src_level, src_z);

   }

}

static void

intel_copy_image_sub_data(struct gl_context *ctx,

                          struct gl_texture_image *src_image,

                          int src_x, int src_y, int src_z,

                          struct gl_texture_image *dst_image,

                          int dst_x, int dst_y, int dst_z,

                          int src_width, int src_height)

{

   struct brw_context *brw = brw_context(ctx);

   struct intel_texture_image *intel_src_image = intel_texture_image(src_image);

   struct intel_texture_image *intel_dst_image = intel_texture_image(dst_image);

   if (_mesa_meta_CopyImageSubData_uncompressed(ctx,

                                                src_image, src_x, src_y, src_z,

                                                dst_image, dst_x, dst_y, dst_z,

                                                src_width, src_height)) {

      return;

   }

   if (intel_src_image->mt->num_samples > 0 ||

       intel_dst_image->mt->num_samples > 0) {

      _mesa_problem(ctx, "Failed to copy multisampled texture with meta path\n");

      return;

   }

   /* Cube maps actually have different images per face */

   if (src_image->TexObject->Target == GL_TEXTURE_CUBE_MAP)

      src_z = src_image->Face;

   if (dst_image->TexObject->Target == GL_TEXTURE_CUBE_MAP)

      dst_z = dst_image->Face;

   /* We are now going to try and copy the texture using the blitter.  If

    * that fails, we will fall back mapping the texture and using memcpy.

    * In either case, we need to do a full resolve.

    */

   intel_miptree_all_slices_resolve_hiz(brw, intel_src_image->mt);

   intel_miptree_all_slices_resolve_depth(brw, intel_src_image->mt);

   intel_miptree_resolve_color(brw, intel_src_image->mt);

   intel_miptree_all_slices_resolve_hiz(brw, intel_dst_image->mt);

   intel_miptree_all_slices_resolve_depth(brw, intel_dst_image->mt);

   intel_miptree_resolve_color(brw, intel_dst_image->mt);

   unsigned src_level = src_image->Level + src_image->TexObject->MinLevel;

   unsigned dst_level = dst_image->Level + dst_image->TexObject->MinLevel;

   if (copy_image_with_blitter(brw, intel_src_image->mt, src_level,

                               src_x, src_y, src_z,

                               intel_dst_image->mt, dst_level,

                               dst_x, dst_y, dst_z,

                               src_width, src_height))

      return;

   /* This is a worst-case scenario software fallback that maps the two

    * textures and does a memcpy between them.

    */

   copy_image_with_memcpy(brw, intel_src_image->mt, src_level,

                          src_x, src_y, src_z,

                          intel_dst_image->mt, dst_level,

                          dst_x, dst_y, dst_z,

                          src_width, src_height);

}

void

intelInitCopyImageFuncs(struct dd_function_table *functions)

{

   functions->CopyImageSubData = intel_copy_image_sub_data;

}