/* $Id$ */ /* * 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/>. */ /** @file newgrf_animation_base.h Function implementations related to NewGRF animation. */ /* No inclusion guards as this file must only be included from .cpp files. */ #include "animated_tile_func.h" #include "core/random_func.hpp" #include "date_func.h" #include "functions.h" #include "newgrf_animation_type.h" #include "newgrf_callbacks.h" /** * Helper class for a unified approach to NewGRF animation. * @tparam Tbase Instantiation of this class. * @tparam Tspec NewGRF specification related to the animated tile. * @tparam Tobj Object related to the animated tile. * @tparam GetCallback The callback function pointer. */ template <typename Tbase, typename Tspec, typename Tobj, uint16 (*GetCallback)(CallbackID callback, uint32 param1, uint32 param2, const Tspec *statspec, const Tobj *st, TileIndex tile)> struct AnimationBase { /** * Animate a single tile. * @param cb The callback to actually call. * @param spec Specification related to the tile. * @param obj Object related to the tile. * @param tile Tile to animate changes for. * @param random_animation Whether to pass random bits to the "next frame" callback. */ static void AnimateTile(const Tspec *spec, const Tobj *obj, TileIndex tile, bool random_animation) { assert(spec != NULL); /* Acquire the animation speed from the NewGRF. */ uint8 animation_speed = spec->animation.speed; if (HasBit(spec->callback_mask, Tbase::cbm_animation_speed)) { uint16 callback = GetCallback(Tbase::cb_animation_speed, 0, 0, spec, obj, tile); if (callback != CALLBACK_FAILED) animation_speed = Clamp(callback & 0xFF, 0, 16); } /* An animation speed of 2 means the animation frame changes 4 ticks, and * increasing this value by one doubles the wait. 0 is the minimum value * allowed for animation_speed, which corresponds to 30ms, and 16 is the * maximum, corresponding to around 33 minutes. */ if (_tick_counter % (1 << animation_speed) != 0) return; uint8 frame = GetAnimationFrame(tile); uint8 num_frames = spec->animation.frames; bool frame_set_by_callback = false; if (HasBit(spec->callback_mask, Tbase::cbm_animation_next_frame)) { uint16 callback = GetCallback(Tbase::cb_animation_next_frame, random_animation ? Random() : 0, 0, spec, obj, tile); if (callback != CALLBACK_FAILED) { frame_set_by_callback = true; switch (callback & 0xFF) { case 0xFF: DeleteAnimatedTile(tile); break; case 0xFE: frame_set_by_callback = false; break; default: frame = callback & 0xFF; break; } /* If the lower 7 bits of the upper byte of the callback * result are not empty, it is a sound effect. */ if (GB(callback, 8, 7) != 0) PlayTileSound(spec->grf_prop.grffile, GB(callback, 8, 7), tile); } } if (!frame_set_by_callback) { if (frame < num_frames) { frame++; } else if (frame == num_frames && spec->animation.status == ANIM_STATUS_LOOPING) { /* This animation loops, so start again from the beginning */ frame = 0; } else { /* This animation doesn't loop, so stay here */ DeleteAnimatedTile(tile); } } SetAnimationFrame(tile, frame); MarkTileDirtyByTile(tile); } /** * Check a callback to determine what the next animation step is and * execute that step. This includes stopping and starting animations * as well as updating animation frames and playing sounds. * @param cb The callback to actually call. * @param spec Specification related to the tile. * @param obj Object related to the tile. * @param tile Tile to consider animation changes for. * @param random_bits Random bits for this update. To be passed as parameter to the NewGRF. * @param trigger What triggered this update? To be passed as parameter to the NewGRF. */ static void ChangeAnimationFrame(CallbackID cb, const Tspec *spec, const Tobj *obj, TileIndex tile, uint32 random_bits, uint32 trigger) { uint16 callback = GetCallback(cb, random_bits, trigger, spec, obj, tile); if (callback == CALLBACK_FAILED) return; switch (callback & 0xFF) { case 0xFD: /* Do nothing. */ break; case 0xFE: AddAnimatedTile(tile); break; case 0xFF: DeleteAnimatedTile(tile); break; default: SetAnimationFrame(tile, callback); AddAnimatedTile(tile); break; } /* If the lower 7 bits of the upper byte of the callback * result are not empty, it is a sound effect. */ if (GB(callback, 8, 7) != 0) PlayTileSound(spec->grf_prop.grffile, GB(callback, 8, 7), tile); } };