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/* $Id$ */
/*
* 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 "viewport_func.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 Textra Custom extra callback data.
* @tparam GetCallback The callback function pointer.
*/
template <typename Tbase, typename Tspec, typename Tobj, typename Textra, uint16 (*GetCallback)(CallbackID callback, uint32 param1, uint32 param2, const Tspec *statspec, Tobj *st, TileIndex tile, Textra extra_data)>
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.
* @param extra_data Custom extra callback data.
*/
static void AnimateTile(const Tspec *spec, Tobj *obj, TileIndex tile, bool random_animation, Textra extra_data = 0)
{
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, extra_data);
if (callback != CALLBACK_FAILED) {
if (callback >= 0x100 && spec->grf_prop.grffile->grf_version >= 8) ErrorUnknownCallbackResult(spec->grf_prop.grffile->grfid, Tbase::cb_animation_speed, callback);
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, extra_data);
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.
* @param extra_data Custom extra data for callback processing.
*/
static void ChangeAnimationFrame(CallbackID cb, const Tspec *spec, Tobj *obj, TileIndex tile, uint32 random_bits, uint32 trigger, Textra extra_data = 0)
{
uint16 callback = GetCallback(cb, random_bits, trigger, spec, obj, tile, extra_data);
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);
}
};
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