/*
 * Copyright (c) 2012-2015 Etnaviv Project
 *
 * 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
 * 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:
 *    Wladimir J. van der Laan <laanwj@gmail.com>
 */

#include "etnaviv_tiling.h"

#include <stdint.h>
#include <stdio.h>

#define TEX_TILE_WIDTH (4)
#define TEX_TILE_HEIGHT (4)
#define TEX_TILE_WORDS (TEX_TILE_WIDTH * TEX_TILE_HEIGHT)

#define DO_TILE(type)                                                   \
   src_stride /= sizeof(type);                                          \
   dst_stride = (dst_stride * TEX_TILE_HEIGHT) / sizeof(type);          \
   for (unsigned srcy = 0; srcy < height; ++srcy) {                     \
      unsigned dsty = basey + srcy;                                     \
      unsigned ty = (dsty / TEX_TILE_HEIGHT) * dst_stride +             \
                    (dsty % TEX_TILE_HEIGHT) * TEX_TILE_WIDTH;          \
      for (unsigned srcx = 0; srcx < width; ++srcx) {                   \
         unsigned dstx = basex + srcx;                                  \
         ((type *)dest)[ty + (dstx / TEX_TILE_WIDTH) * TEX_TILE_WORDS + \
                        (dstx % TEX_TILE_WIDTH)] =                      \
            ((type *)src)[srcy * src_stride + srcx];                    \
      }                                                                 \
   }

#define DO_UNTILE(type)                                                   \
   src_stride = (src_stride * TEX_TILE_HEIGHT) / sizeof(type);            \
   dst_stride /= sizeof(type);                                            \
   for (unsigned dsty = 0; dsty < height; ++dsty) {                       \
      unsigned srcy = basey + dsty;                                       \
      unsigned sy = (srcy / TEX_TILE_HEIGHT) * src_stride +               \
                    (srcy % TEX_TILE_HEIGHT) * TEX_TILE_WIDTH;            \
      for (unsigned dstx = 0; dstx < width; ++dstx) {                     \
         unsigned srcx = basex + dstx;                                    \
         ((type *)dest)[dsty * dst_stride + dstx] =                       \
            ((type *)src)[sy + (srcx / TEX_TILE_WIDTH) * TEX_TILE_WORDS + \
                          (srcx % TEX_TILE_WIDTH)];                       \
      }                                                                   \
   }

void
etna_texture_tile(void *dest, void *src, unsigned basex, unsigned basey,
                  unsigned dst_stride, unsigned width, unsigned height,
                  unsigned src_stride, unsigned elmtsize)
{
   if (elmtsize == 4) {
      DO_TILE(uint32_t)
   } else if (elmtsize == 2) {
      DO_TILE(uint16_t)
   } else if (elmtsize == 1) {
      DO_TILE(uint8_t)
   } else {
      printf("etna_texture_tile: unhandled element size %i\n", elmtsize);
   }
}

void
etna_texture_untile(void *dest, void *src, unsigned basex, unsigned basey,
                    unsigned src_stride, unsigned width, unsigned height,
                    unsigned dst_stride, unsigned elmtsize)
{
   if (elmtsize == 4) {
      DO_UNTILE(uint32_t);
   } else if (elmtsize == 2) {
      DO_UNTILE(uint16_t);
   } else if (elmtsize == 1) {
      DO_UNTILE(uint8_t);
   } else {
      printf("etna_texture_tile: unhandled element size %i\n", elmtsize);
   }
}
