32bpp_anim_sse2.cpp

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifdef WITH_SSE
 
#include "../stdafx.h"
#include "../video/video_driver.hpp"
#include "32bpp_anim_sse2.hpp"
#include "32bpp_sse_func.hpp"
 
#include "../safeguards.h"
 
static FBlitter_32bppSSE2_Anim iFBlitter_32bppSSE2_Anim;
 
GNU_TARGET("sse2")
void Blitter_32bppSSE2_Anim::PaletteAnimate(const Palette &palette)
{
  assert(!_screen_disable_anim);
 
  this->palette = palette;
  /* If first_dirty is 0, it is for 8bpp indication to send the new
   *  palette. However, only the animation colours might possibly change.
   *  Especially when going between toyland and non-toyland. */
  assert(this->palette.first_dirty == PALETTE_ANIM_START || this->palette.first_dirty == 0);
 
  const uint16_t *anim = this->anim_buf;
  Colour *dst = (Colour *)_screen.dst_ptr;
 
  bool screen_dirty = false;
 
  /* Let's walk the anim buffer and try to find the pixels */
  const int width = this->anim_buf_width;
  const int screen_pitch = _screen.pitch;
  const int anim_pitch = this->anim_buf_pitch;
  __m128i anim_cmp = _mm_set1_epi16(PALETTE_ANIM_START - 1);
  __m128i brightness_cmp = _mm_set1_epi16(Blitter_32bppBase::DEFAULT_BRIGHTNESS);
  __m128i colour_mask = _mm_set1_epi16(0xFF);
  for (int y = this->anim_buf_height; y != 0 ; y--) {
    Colour *next_dst_ln = dst + screen_pitch;
    const uint16_t *next_anim_ln = anim + anim_pitch;
    int x = width;
    while (x > 0) {
      __m128i data = _mm_load_si128((const __m128i *) anim);
 
      /* low bytes only, shifted into high positions */
      __m128i colour_data = _mm_and_si128(data, colour_mask);
 
      /* test if any colour >= PALETTE_ANIM_START */
      int colour_cmp_result = _mm_movemask_epi8(_mm_cmpgt_epi16(colour_data, anim_cmp));
      if (colour_cmp_result) {
        /* test if any brightness is unexpected */
        if (x < 8 || colour_cmp_result != 0xFFFF ||
            _mm_movemask_epi8(_mm_cmpeq_epi16(_mm_srli_epi16(data, 8), brightness_cmp)) != 0xFFFF) {
          /* slow path: < 8 pixels left or unexpected brightnesses */
          for (int z = std::min<int>(x, 8); z != 0 ; z--) {
            int value = _mm_extract_epi16(data, 0);
            uint8_t colour = GB(value, 0, 8);
            if (colour >= PALETTE_ANIM_START) {
              /* Update this pixel */
              *dst = AdjustBrightneSSE(LookupColourInPalette(colour), GB(value, 8, 8));
              screen_dirty = true;
            }
            data = _mm_srli_si128(data, 2);
            dst++;
          }
        } else {
          /* medium path: 8 pixels to animate all of expected brightnesses */
          for (int z = 0; z < 8; z++) {
            *dst = LookupColourInPalette(_mm_extract_epi16(colour_data, 0));
            colour_data = _mm_srli_si128(colour_data, 2);
            dst++;
          }
          screen_dirty = true;
        }
      } else {
        /* fast path, no animation */
        dst += 8;
      }
      anim += 8;
      x -= 8;
    }
    dst = next_dst_ln;
    anim = next_anim_ln;
  }
 
  if (screen_dirty) {
    /* Make sure the backend redraws the whole screen */
    VideoDriver::GetInstance()->MakeDirty(0, 0, _screen.width, _screen.height);
  }
}
 
#endif /* WITH_SSE */