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 *

 * Copyright 2003 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.

 *

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

#include "main/macros.h"

#include "main/mtypes.h"

#include "main/pbo.h"

#include "main/texobj.h"

#include "main/texstore.h"

#include "main/texcompress.h"

#include "main/enums.h"

#include "intel_batchbuffer.h"

#include "intel_tex.h"

#include "intel_mipmap_tree.h"

#include "intel_blit.h"

intel_blit_texsubimage(struct gl_context * ctx,

		       struct gl_texture_image *texImage,

		       GLint xoffset, GLint yoffset,

		       GLint width, GLint height,

		       GLenum format, GLenum type, const void *pixels,

		       const struct gl_pixelstore_attrib *packing)

{

   struct brw_context *brw = brw_context(ctx);

   struct intel_texture_image *intelImage = intel_texture_image(texImage);

    * currently busy.

    */

   if (!intelImage->mt)

      return false;

   if (intelImage->mt->region->tiling == I915_TILING_Y)

      return false;

      return false;

    * this because of all the overhead involved.

    */

   if (brw->gen >= 6)

      return false;

      return false;

       __FUNCTION__,

       _mesa_lookup_enum_by_nr(texImage->TexObject->Target),

       texImage->Level, xoffset, yoffset, width, height);

					format, type, pixels, packing,

					"glTexSubImage");

   if (!pixels)

      return false;

      intel_miptree_create(brw, GL_TEXTURE_2D, texImage->TexFormat,

                           0, 0,

                           width, height, 1,

                           false, 0, INTEL_MIPTREE_TILING_NONE);

   if (!temp_mt)

      goto err;

   if (!dst)

      goto err;

		       texImage->TexFormat,

		       temp_mt->region->pitch,

		       &dst,

		       width, height, 1,

		       format, type, pixels, packing)) {

      _mesa_error(ctx, GL_OUT_OF_MEMORY, "intelTexSubImage");

   }

                            temp_mt, 0, 0,

                            0, 0, false,

                            intelImage->mt, texImage->Level, texImage->Face,

                            xoffset, yoffset, false,

                            width, height, GL_COPY);

   assert(ret);

   _mesa_unmap_teximage_pbo(ctx, packing);

   _mesa_error(ctx, GL_OUT_OF_MEMORY, "intelTexSubImage");

   intel_miptree_release(&temp_mt);

   _mesa_unmap_teximage_pbo(ctx, packing);

   return false;

}

 * \brief A fast path for glTexImage and glTexSubImage.

 *

 * \param for_glTexImage Was this called from glTexImage or glTexSubImage?

 *

 * This fast path is taken when the hardware natively supports the texture

 * format (such as GL_BGRA) and when the texture memory is X-tiled. It uploads

 * the texture data by mapping the texture memory without a GTT fence, thus

 * acquiring a tiled view of the memory, and then memcpy'ing sucessive

 * subspans within each tile.

 *

 * This is a performance win over the conventional texture upload path because

 * it avoids the performance penalty of writing through the write-combine

 * buffer. In the conventional texture upload path,

 * texstore.c:store_texsubimage(), the texture memory is mapped through a GTT

 * fence, thus acquiring a linear view of the memory, then each row in the

 * image is memcpy'd. In this fast path, we replace each row's memcpy with

 * a sequence of memcpy's over each bit6 swizzle span in the row.

 *

 * This fast path's use case is Google Chrome's paint rectangles.  Chrome (as

 * of version 21) renders each page as a tiling of 256x256 GL_BGRA textures.

 * Each page's content is initially uploaded with glTexImage2D and damaged

 * regions are updated with glTexSubImage2D. On some workloads, the

 * performance gain of this fastpath on Sandybridge is over 5x.

 */

bool

intel_texsubimage_tiled_memcpy(struct gl_context * ctx,

                               GLuint dims,

                               struct gl_texture_image *texImage,

                               GLint xoffset, GLint yoffset, GLint zoffset,

                               GLsizei width, GLsizei height, GLsizei depth,

                               GLenum format, GLenum type,

                               const GLvoid *pixels,

                               const struct gl_pixelstore_attrib *packing,

                               bool for_glTexImage)

{

   struct brw_context *brw = brw_context(ctx);

   struct intel_texture_image *image = intel_texture_image(texImage);

   drm_intel_bo *bo;

    * a 2D BGRA texture. It could be generalized to support more types by

    * varying the arithmetic loop below.

    */

   if (!brw->has_llc ||

       format != GL_BGRA ||

       type != GL_UNSIGNED_BYTE ||

       texImage->TexFormat != MESA_FORMAT_ARGB8888 ||

       texImage->TexObject->Target != GL_TEXTURE_2D ||

       texImage->Level != 0 ||

       pixels == NULL ||

       _mesa_is_bufferobj(packing->BufferObj) ||

       packing->Alignment > 4 ||

       packing->SkipPixels > 0 ||

       packing->SkipRows > 0 ||

       (packing->RowLength != 0 && packing->RowLength != width) ||

       packing->SwapBytes ||

       packing->LsbFirst ||

       packing->Invert)

      return false;

      ctx->Driver.AllocTextureImageBuffer(ctx, texImage);

       image->mt->region->tiling != I915_TILING_X) {

      /* The algorithm below is written only for X-tiled memory. */

      return false;

   }

    * any pending fast color clears before we start.

    */

   intel_miptree_resolve_color(brw, image->mt);

      perf_debug("Flushing before mapping a referenced bo.\n");

      intel_batchbuffer_flush(brw);

   }

      if (drm_intel_bo_busy(bo)) {

         perf_debug("Mapping a busy BO, causing a stall on the GPU.\n");

      }

   }

   if (error || bo->virtual == NULL) {

      DBG("%s: failed to map bo\n", __FUNCTION__);

      return false;

   }

    * the function.

    */

   DBG("%s: level=%d offset=(%d,%d) (w,h)=(%d,%d)\n",

       __FUNCTION__, texImage->Level, xoffset, yoffset, width, height);

    * others are in units of bytes, and others (such as height) are unitless.

    * Each variable name is suffixed with its units.

    */

   const uint32_t y_max_pixels = yoffset + height;

   const uint32_t tile_width_pixels = 128;

   const uint32_t swizzle_width_pixels = 16;

   const uint32_t width_tiles = stride_bytes / tile_width_bytes;

      const uint32_t y_offset_bytes = (y_pixels / tile_height) * width_tiles * tile_size_bytes

                                    + (y_pixels % tile_height) * tile_width_bytes;

         const uint32_t x_offset_bytes = (x_pixels / tile_width_pixels) * tile_size_bytes

                                       + (x_pixels % tile_width_pixels) * cpp;

         if (brw->has_swizzling) {

#if 0

            /* Clear, unoptimized version. */

            bool bit6 = (offset_bytes >> 6) & 1;

            bool bit9 = (offset_bytes >> 9) & 1;

            bool bit10 = (offset_bytes >> 10) & 1;

               offset_bytes ^= (1 << 6);

#else

            /* Optimized, obfuscated version. */

            offset_bytes ^= ((offset_bytes >> 3) ^ (offset_bytes >> 4))

                          & (1 << 6);

#endif

         }

         const uint32_t memcpy_bound_pixels = MIN2(x_max_pixels, swizzle_bound_pixels);

         const uint32_t copy_size = cpp * (memcpy_bound_pixels - x_pixels);

         pixels += copy_size;

         x_pixels -= (x_pixels % swizzle_width_pixels);

      }

   }

   return true;

}

intelTexSubImage(struct gl_context * ctx,

                 GLuint dims,

                 struct gl_texture_image *texImage,

                 GLint xoffset, GLint yoffset, GLint zoffset,

                 GLsizei width, GLsizei height, GLsizei depth,

                 GLenum format, GLenum type,

                 const GLvoid * pixels,

                 const struct gl_pixelstore_attrib *packing)

{

   bool ok;

                                       xoffset, yoffset, zoffset,

                                       width, height, depth,

                                       format, type, pixels, packing,

                                       false /*for_glTexImage*/);

   if (ok)

     return;

   if (dims != 2 || !intel_blit_texsubimage(ctx, texImage,

			       xoffset, yoffset,

			       width, height,

			       format, type, pixels, packing)) {

      _mesa_store_texsubimage(ctx, dims, texImage,

                              xoffset, yoffset, zoffset,

                              width, height, depth,

                              format, type, pixels, packing);

   }

}

intelInitTextureSubImageFuncs(struct dd_function_table *functions)

{

   functions->TexSubImage = intelTexSubImage;

}