OpenTTD: src/newgrf_animation_base.h Source File

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newgrf_animation_base.h
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1 /* $Id: newgrf_animation_base.h 24846 2012-12-23 21:09:09Z frosch $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 /* No inclusion guards as this file must only be included from .cpp files. */
13
14 #include "animated_tile_func.h"
15 #include "core/random_func.hpp"
16 #include "date_func.h"
17 #include "viewport_func.h"
18 #include "newgrf_animation_type.h"
19 #include "newgrf_callbacks.h"
20 #include "tile_map.h"
21
30 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)>
31 struct AnimationBase {
41 static void AnimateTile(const Tspec *spec, Tobj *obj, TileIndex tile, bool random_animation, Textra extra_data = 0)
42 {
43 assert(spec != NULL);
44
45 /* Acquire the animation speed from the NewGRF. */
46 uint8 animation_speed = spec->animation.speed;
47 if (HasBit(spec->callback_mask, Tbase::cbm_animation_speed)) {
48 uint16 callback = GetCallback(Tbase::cb_animation_speed, 0, 0, spec, obj, tile, extra_data);
49 if (callback != CALLBACK_FAILED) {
50 if (callback >= 0x100 && spec->grf_prop.grffile->grf_version >= 8) ErrorUnknownCallbackResult(spec->grf_prop.grffile->grfid, Tbase::cb_animation_speed, callback);
51 animation_speed = Clamp(callback & 0xFF, 0, 16);
52 }
53 }
54
55 /* An animation speed of 2 means the animation frame changes 4 ticks, and
56 * increasing this value by one doubles the wait. 0 is the minimum value
57 * allowed for animation_speed, which corresponds to 30ms, and 16 is the
58 * maximum, corresponding to around 33 minutes. */
59 if (_tick_counter % (1 << animation_speed) != 0) return;
60
61 uint8 frame = GetAnimationFrame(tile);
62 uint8 num_frames = spec->animation.frames;
63
64 bool frame_set_by_callback = false;
65
66 if (HasBit(spec->callback_mask, Tbase::cbm_animation_next_frame)) {
67 uint16 callback = GetCallback(Tbase::cb_animation_next_frame, random_animation ? Random() : 0, 0, spec, obj, tile, extra_data);
68
69 if (callback != CALLBACK_FAILED) {
70 frame_set_by_callback = true;
71
72 switch (callback & 0xFF) {
73 case 0xFF:
74 DeleteAnimatedTile(tile);
75 break;
76
77 case 0xFE:
78 frame_set_by_callback = false;
79 break;
80
81 default:
82 frame = callback & 0xFF;
83 break;
84 }
85
86 /* If the lower 7 bits of the upper byte of the callback
87 * result are not empty, it is a sound effect. */
88 if (GB(callback, 8, 7) != 0 && _settings_client.sound.ambient) PlayTileSound(spec->grf_prop.grffile, GB(callback, 8, 7), tile);
89 }
90 }
91
92 if (!frame_set_by_callback) {
93 if (frame < num_frames) {
94 frame++;
95 } else if (frame == num_frames && spec->animation.status == ANIM_STATUS_LOOPING) {
96 /* This animation loops, so start again from the beginning */
97 frame = 0;
98 } else {
99 /* This animation doesn't loop, so stay here */
100 DeleteAnimatedTile(tile);
101 }
102 }
103
104 SetAnimationFrame(tile, frame);
105 MarkTileDirtyByTile(tile);
106 }
107
120 static void ChangeAnimationFrame(CallbackID cb, const Tspec *spec, Tobj *obj, TileIndex tile, uint32 random_bits, uint32 trigger, Textra extra_data = 0)
121 {
122 uint16 callback = GetCallback(cb, random_bits, trigger, spec, obj, tile, extra_data);
123 if (callback == CALLBACK_FAILED) return;
124
125 switch (callback & 0xFF) {
126 case 0xFD: /* Do nothing. */ break;
127 case 0xFE: AddAnimatedTile(tile); break;
128 case 0xFF: DeleteAnimatedTile(tile); break;
129 default:
130 SetAnimationFrame(tile, callback);
131 AddAnimatedTile(tile);
132 break;
133 }
134
135 /* If the lower 7 bits of the upper byte of the callback
136 * result are not empty, it is a sound effect. */
137 if (GB(callback, 8, 7) != 0 && _settings_client.sound.ambient) PlayTileSound(spec->grf_prop.grffile, GB(callback, 8, 7), tile);
138 }
139 };