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OpenRCT2/src/world/climate.c
2016-06-03 11:29:50 +02:00

428 lines
16 KiB
C

#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
/*****************************************************************************
* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
*
* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
* For more information, visit https://github.com/OpenRCT2/OpenRCT2
*
* OpenRCT2 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, either version 3 of the License, or
* (at your option) any later version.
*
* A full copy of the GNU General Public License can be found in licence.txt
*****************************************************************************/
#pragma endregion
#include "../audio/audio.h"
#include "../audio/mixer.h"
#include "../cheats.h"
#include "../config.h"
#include "../drawing/drawing.h"
#include "../game.h"
#include "../interface/window.h"
#include "../localisation/date.h"
#include "../scenario.h"
#include "../util/util.h"
#include "climate.h"
enum {
THUNDER_STATUS_NULL = 0,
THUNDER_STATUS_PLAYING = 1,
MAX_THUNDER_INSTANCES = 2
};
#pragma pack(push, 1)
typedef struct rct_weather_transition {
sint8 base_temperature;
sint8 distribution_size;
sint8 distribution[24];
} rct_weather_transition;
assert_struct_size(rct_weather_transition, 26);
#pragma pack(pop)
static const rct_weather_transition* climate_transitions[4];
uint16 gClimateLightningFlash;
// Sound data
static int _rainVolume = 1;
static unsigned int _lightningTimer, _thunderTimer;
static void* _thunderSoundChannels[MAX_THUNDER_INSTANCES];
static int _thunderStatus[MAX_THUNDER_INSTANCES] = { THUNDER_STATUS_NULL, THUNDER_STATUS_NULL };
static unsigned int _thunderSoundId;
static int _thunderVolume;
static int _thunderStereoEcho = 0;
static void climate_determine_future_weather(int randomDistribution);
static void climate_update_rain_sound();
static void climate_update_thunder_sound();
static void climate_update_lightning();
static void climate_update_thunder();
static int climate_play_thunder(int instanceIndex, int soundId, int volume, int pan);
int climate_celsius_to_fahrenheit(int celsius)
{
return (celsius * 29) / 16 + 32;
}
/**
* Set climate and determine start weather.
* rct2: 0x006C45ED
*/
void climate_reset(int climate)
{
gClimate = climate;
sint8 month = gDateMonthsElapsed & 7;
const rct_weather_transition* climate_table = climate_transitions[climate];
rct_weather_transition transition = climate_table[month];
sint8 weather = WEATHER_PARTIALLY_CLOUDY;
gClimateCurrentWeather = weather;
gClimateCurrentTemperature = transition.base_temperature + climate_weather_data[weather].temp_delta;
gClimateCurrentWeatherEffect = climate_weather_data[weather].effect_level;
gClimateCurrentWeatherGloom = climate_weather_data[weather].gloom_level;
gClimateCurrentRainLevel = climate_weather_data[weather].rain_level;
_lightningTimer = 0;
_thunderTimer = 0;
if (_rainVolume != 1){
audio_stop_rain_sound();
_rainVolume = 1;
}
climate_determine_future_weather(util_rand());
}
sint8 step_weather_level(sint8 cur_weather_level, sint8 next_weather_level) {
if (next_weather_level > cur_weather_level) {
return cur_weather_level + 1;
} else {
return cur_weather_level - 1;
}
}
/**
* Weather & climate update iteration.
* Gradually changes the weather parameters towards their determined next values.
*
* rct2: 0x006C46B1
*/
void climate_update()
{
uint8 screen_flags = gScreenFlags;
sint8 temperature = gClimateCurrentTemperature,
target_temperature = gClimateNextTemperature,
cur_gloom = gClimateCurrentWeatherGloom,
next_gloom = gClimateNextWeatherGloom,
cur_rain = gClimateCurrentRainLevel,
next_rain = gClimateNextRainLevel;
if (gCheatsFreezeClimate) //for cheats
return;
if (screen_flags & (~SCREEN_FLAGS_PLAYING)) // only normal play mode gets climate
return;
if (gClimateUpdateTimer) {
if (gClimateUpdateTimer == 960) {
gToolbarDirtyFlags |= BTM_TB_DIRTY_FLAG_CLIMATE;
}
gClimateUpdateTimer--;
} else if (!(gCurrentTicks & 0x7F)) {
if (temperature == target_temperature) {
if (cur_gloom == next_gloom) {
gClimateCurrentWeatherEffect = gClimateNextWeatherEffect;
_thunderTimer = 0;
_lightningTimer = 0;
if (cur_rain == next_rain) {
gClimateCurrentWeather = gClimateNextWeather;
climate_determine_future_weather(scenario_rand());
gToolbarDirtyFlags |= BTM_TB_DIRTY_FLAG_CLIMATE;
} else if (next_rain <= 2) { // Safe-guard
gClimateCurrentRainLevel = step_weather_level(cur_rain, next_rain);
}
} else {
gClimateCurrentWeatherGloom = step_weather_level(cur_gloom, next_gloom);
gfx_invalidate_screen();
}
} else {
gClimateCurrentTemperature = step_weather_level(temperature, target_temperature);
gToolbarDirtyFlags |= BTM_TB_DIRTY_FLAG_CLIMATE;
}
}
if (_thunderTimer != 0) {
climate_update_lightning();
climate_update_thunder();
} else if (gClimateCurrentWeatherEffect == 2) {
// Create new thunder and lightning
unsigned int randomNumber = util_rand();
if ((randomNumber & 0xFFFF) <= 0x1B4) {
randomNumber >>= 16;
_thunderTimer = 43 + (randomNumber % 64);
_lightningTimer = randomNumber % 32;
}
}
}
void climate_force_weather(uint8 weather){
gClimateCurrentWeather = weather;
gClimateCurrentWeatherGloom = climate_weather_data[weather].gloom_level;
gClimateCurrentRainLevel = climate_weather_data[weather].rain_level;
gClimateCurrentWeatherEffect = climate_weather_data[weather].effect_level;
gClimateUpdateTimer = 1920;
climate_update();
// In case of change in gloom level force a complete redraw
gfx_invalidate_screen();
}
/**
* Calculates future weather development.
* RCT2 implements this as discrete probability distributions dependant on month and climate
* for next_weather. The other weather parameters are then looked up depending only on the
* next weather.
*
* rct2: 0x006C461C
*/
static void climate_determine_future_weather(int randomDistribution)
{
sint8 climate = gClimate;
const rct_weather_transition* climate_table = climate_transitions[climate];
sint8 month = gDateMonthsElapsed & 7;
rct_weather_transition transition = climate_table[month];
// Generate a random variable with values 0 up to distribution_size-1 and chose weather from the distribution table accordingly
sint8 next_weather = transition.distribution[ ((randomDistribution & 0xFF) * transition.distribution_size) >> 8 ];
gClimateNextWeather = next_weather;
gClimateNextTemperature = transition.base_temperature + climate_weather_data[next_weather].temp_delta;
gClimateNextWeatherEffect = climate_weather_data[next_weather].effect_level;
gClimateNextWeatherGloom = climate_weather_data[next_weather].gloom_level;
gClimateNextRainLevel = climate_weather_data[next_weather].rain_level;
gClimateUpdateTimer = 1920;
}
/**
*
* rct2: 0x006BCB91
*/
void climate_update_sound()
{
if (gAudioCurrentDevice == -1)
return;
if (gGameSoundsOff)
return;
if (!gConfigSound.sound_enabled)
return;
if (gScreenFlags & SCREEN_FLAGS_TITLE_DEMO)
return;
climate_update_rain_sound();
climate_update_thunder_sound();
}
static void climate_update_rain_sound()
{
if (gClimateCurrentWeatherEffect == 1 || gClimateCurrentWeatherEffect == 2) {
// Start playing the rain sound
if (!gRainSoundChannel) {
gRainSoundChannel = Mixer_Play_Effect(SOUND_RAIN_1, MIXER_LOOP_INFINITE, DStoMixerVolume(-4000), 0.5f, 1, 0);
}
if (_rainVolume == 1) {
_rainVolume = -4000;
} else {
// Increase rain sound
_rainVolume = min(-1400, _rainVolume + 80);
if (gRainSoundChannel) {
Mixer_Channel_Volume(gRainSoundChannel, DStoMixerVolume(_rainVolume));
}
}
} else if (_rainVolume != 1) {
// Decrease rain sound
_rainVolume -= 80;
if (_rainVolume > -4000) {
if (gRainSoundChannel) {
Mixer_Channel_Volume(gRainSoundChannel, DStoMixerVolume(_rainVolume));
}
} else {
audio_stop_rain_sound();
_rainVolume = 1;
}
}
}
static void climate_update_thunder_sound()
{
if (_thunderStereoEcho) {
// Play thunder on right side
_thunderStereoEcho = 0;
climate_play_thunder(1, _thunderSoundId, _thunderVolume, 10000);
}
// Stop thunder sounds if they have finished
for (int i = 0; i < MAX_THUNDER_INSTANCES; i++) {
if (_thunderStatus[i] == THUNDER_STATUS_NULL)
continue;
if (!Mixer_Channel_IsPlaying(_thunderSoundChannels[i])) {
Mixer_Stop_Channel(_thunderSoundChannels[i]);
_thunderStatus[i] = THUNDER_STATUS_NULL;
}
}
}
static void climate_update_lightning()
{
if (_lightningTimer == 0)
return;
if (!gConfigGeneral.disable_lightning_effect) {
_lightningTimer--;
if (gClimateLightningFlash == 0)
if ((util_rand() & 0xFFFF) <= 0x2000)
gClimateLightningFlash = 1;
}
}
static void climate_update_thunder()
{
_thunderTimer--;
if (_thunderTimer != 0)
return;
unsigned int randomNumber = util_rand();
if (randomNumber & 0x10000) {
if (_thunderStatus[0] == THUNDER_STATUS_NULL && _thunderStatus[1] == THUNDER_STATUS_NULL) {
// Play thunder on left side
_thunderSoundId = (randomNumber & 0x20000) ? SOUND_THUNDER_1 : SOUND_THUNDER_2;
_thunderVolume = (-((int)((randomNumber >> 18) & 0xFF))) * 8;
climate_play_thunder(0, _thunderSoundId, _thunderVolume, -10000);
// Let thunder play on right side
_thunderStereoEcho = 1;
}
} else {
if (_thunderStatus[0] == THUNDER_STATUS_NULL){
_thunderSoundId = (randomNumber & 0x20000) ? SOUND_THUNDER_1 : SOUND_THUNDER_2;
int pan = (((randomNumber >> 18) & 0xFF) - 128) * 16;
climate_play_thunder(0, _thunderSoundId, 0, pan);
}
}
}
static int climate_play_thunder(int instanceIndex, int soundId, int volume, int pan)
{
_thunderSoundChannels[instanceIndex] = Mixer_Play_Effect(soundId, MIXER_LOOP_NONE, DStoMixerVolume(volume), DStoMixerPan(pan), 1, 0);
if (_thunderSoundChannels[instanceIndex]) {
_thunderStatus[instanceIndex] = THUNDER_STATUS_PLAYING;
return 1;
}
return 0;
}
#pragma region Climate / Weather data tables
// rct2: 0x00993C94
// There is actually a sprite at 0x5A9C for snow but only these weather types seem to be fully implemented
const rct_weather climate_weather_data[6] = {
{ .temp_delta = 10, .effect_level = 0, .gloom_level = 0, .rain_level = 0, .sprite_id = 0x5A96 }, // Sunny
{ .temp_delta = 5, .effect_level = 0, .gloom_level = 0, .rain_level = 0, .sprite_id = 0x5A97 }, // Partially Cloudy
{ .temp_delta = 0, .effect_level = 0, .gloom_level = 0, .rain_level = 0, .sprite_id = 0x5A98 }, // Cloudy
{ .temp_delta = -2, .effect_level = 1, .gloom_level = 1, .rain_level = 1, .sprite_id = 0x5A99 }, // Rain
{ .temp_delta = -4, .effect_level = 1, .gloom_level = 2, .rain_level = 2, .sprite_id = 0x5A9A }, // Heavy Rain
{ .temp_delta = 2, .effect_level = 2, .gloom_level = 2, .rain_level = 2, .sprite_id = 0x5A9B }, // Thunderstorm
};
// rct2: 00993998
static const rct_weather_transition climate_cool_and_wet_transitions[] = {
{ .base_temperature = 8, .distribution_size = 18,
.distribution = { 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 0, 0, 0, 0, 0 } },
{ .base_temperature = 10, .distribution_size = 21,
.distribution = { 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 0, 0 } },
{ .base_temperature = 14, .distribution_size = 17,
.distribution = { 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 17, .distribution_size = 17,
.distribution = { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 19, .distribution_size = 23,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 4 } },
{ .base_temperature = 20, .distribution_size = 23,
.distribution = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 4, 4, 5 } },
{ .base_temperature = 16, .distribution_size = 19,
.distribution = { 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 0, 0, 0, 0 } },
{ .base_temperature = 13, .distribution_size = 16,
.distribution = { 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0 } }
};
static const rct_weather_transition climate_warm_transitions[] = {
{ .base_temperature = 12, .distribution_size = 21,
.distribution = { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 4, 0, 0 } },
{ .base_temperature = 13, .distribution_size = 22,
.distribution = { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 5, 0 } },
{ .base_temperature = 16, .distribution_size = 17,
.distribution = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 19, .distribution_size = 18,
.distribution = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 0, 0, 0, 0, 0 } },
{ .base_temperature = 21, .distribution_size = 22,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 0 } },
{ .base_temperature = 22, .distribution_size = 17,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 5, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 19, .distribution_size = 17,
.distribution = { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 16, .distribution_size = 17,
.distribution = { 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 0, 0, 0, 0, 0, 0 } }
};
static const rct_weather_transition climate_hot_and_dry_transitions[] = {
{ .base_temperature = 12, .distribution_size = 15,
.distribution = { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 14, .distribution_size = 12,
.distribution = { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 16, .distribution_size = 11,
.distribution = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 19, .distribution_size = 9,
.distribution = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 21, .distribution_size = 13,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 22, .distribution_size = 11,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 21, .distribution_size = 12,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 16, .distribution_size = 13,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } }
};
static const rct_weather_transition climate_cold_transitions[] = {
{ .base_temperature = 4, .distribution_size = 18,
.distribution = { 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 4, 0, 0, 0, 0, 0 } },
{ .base_temperature = 5, .distribution_size = 21,
.distribution = { 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 4, 5, 0, 0 } },
{ .base_temperature = 7, .distribution_size = 17,
.distribution = { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 9, .distribution_size = 17,
.distribution = { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 0, 0, 0, 0, 0, 0 } },
{ .base_temperature = 10, .distribution_size = 23,
.distribution = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 4 } },
{ .base_temperature = 11, .distribution_size = 23,
.distribution = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 5 } },
{ .base_temperature = 9, .distribution_size = 19,
.distribution = { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 4, 5, 0, 0, 0, 0 } },
{ .base_temperature = 6, .distribution_size = 16,
.distribution = { 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0 } }
};
static const rct_weather_transition* climate_transitions[] = {
climate_cool_and_wet_transitions,
climate_warm_transitions,
climate_hot_and_dry_transitions,
climate_cold_transitions
};
#pragma endregion