Initial commit

engines/stark/visual/effects/fireflies.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "engines/stark/visual/effects/fireflies.h"
+
+#include "common/random.h"
+#include "common/tokenizer.h"
+
+#include "graphics/surface.h"
+
+#include "engines/stark/gfx/driver.h"
+#include "engines/stark/gfx/surfacerenderer.h"
+#include "engines/stark/gfx/bitmap.h"
+
+#include "engines/stark/services/global.h"
+#include "engines/stark/services/services.h"
+#include "engines/stark/services/settings.h"
+
+namespace Stark {
+
+VisualEffectFireFlies::VisualEffectFireFlies(Gfx::Driver *gfx, const Common::Point &size) :
+		VisualEffect(TYPE, size, gfx),
+		_fireFlyCount(10),
+		_mainColorR(44),
+		_mainColorG(20),
+		_mainColorB(33) {
+}
+
+VisualEffectFireFlies::~VisualEffectFireFlies() {
+}
+
+void VisualEffectFireFlies::render(const Common::Point &position) {
+	// Stop rendering if special effect is off
+	if (!StarkSettings->getBoolSetting(Settings::kSpecialFX)) return;
+
+	_timeRemainingUntilNextUpdate -= StarkGlobal->getMillisecondsPerGameloop();
+	if (_timeRemainingUntilNextUpdate <= 0) {
+		update();
+		_timeRemainingUntilNextUpdate = _timeBetweenTwoUpdates;
+	}
+
+	// Fill with transparent color
+	_surface->fillRect(Common::Rect(_surface->w, _surface->h), 0);
+
+	for (uint i = 0; i < _fireFlies.size(); i++) {
+		drawFireFly(_fireFlies[i]);
+	}
+
+	_bitmap->update(_surface);
+	_surfaceRenderer->render(_bitmap, position);
+}
+
+void VisualEffectFireFlies::setParams(const Common::String &params) {
+	// Example input: GFX_FireFlies( 2, 70 )
+	Common::StringTokenizer tokenizer(params, "(), ");
+
+	int index = 0;
+	while (!tokenizer.empty()) {
+		Common::String token = tokenizer.nextToken();
+		switch (index) {
+		case 0:
+			if (token != "GFX_FireFlies") {
+				error("Unexpected effect type '%s'", token.c_str());
+			}
+			break;
+		case 1:
+			_timeBetweenTwoUpdates = CLIP<uint>(strtol(token.c_str(), nullptr, 10), 0, 1000) * 33;
+			break;
+		case 2:
+			_fireFlyCount = CLIP<uint>(strtol(token.c_str(), nullptr, 10), 1, 300);
+			break;
+		case 3:
+			_mainColorR = strtol(token.c_str(), nullptr, 10);
+			break;
+		case 4:
+			_mainColorG = strtol(token.c_str(), nullptr, 10);
+			break;
+		case 5:
+			_mainColorB = strtol(token.c_str(), nullptr, 10);
+			break;
+		default:
+			warning("Unexpected parameter %d: %s", index, token.c_str());
+		}
+
+		index++;
+	}
+
+	_frames.resize(40);
+	for (uint i = 0; i < _frames.size(); i++) {
+		Frame &frame = _frames[i];
+
+		// Barycentric coordinates
+		float t = (cos((_frames.size() - i) / (float)_frames.size() * 2.1415f + 0.5f) + 1.0f) * 0.5f;
+		frame.weight1 = (1.0f - t) * (1.0f - t) * (1.0f - t) / 6.0f;
+		frame.weight2 = (t * t * t * 3.0f - t * t * 6.0f + 4.0f) / 6.0f;
+		frame.weight3 = (((3.0f - t * 3.0f) * t + 3.0f) * t + 1.0f) / 6.0f;
+		frame.weight4 = t * t * t / 6.0f;
+
+		int green;
+		if (i < 5) {
+			green = _mainColorG + (255 - _mainColorG) * (5 - i) / 5;
+		} else if (i + 4 >= _frames.size()) {
+			green = _mainColorG + (255 - _mainColorG) * (i + 4 - _frames.size()) / 5;
+		} else {
+			green = _mainColorG;
+		}
+		frame.color = _surface->format.RGBToColor(_mainColorR, green, _mainColorB);
+	}
+
+	_fireFlies.resize(_fireFlyCount);
+	for (uint i = 0; i < _fireFlies.size(); i++) {
+		FireFly &fireFly = _fireFlies[i];
+
+		fireFly.point1.x = StarkRandomSource->getRandomNumber(_size.x - 1);
+		fireFly.point1.y = StarkRandomSource->getRandomNumber(_size.y - 1);
+		fireFly.point2.x = StarkRandomSource->getRandomNumber(_size.x - 1);
+		fireFly.point2.y = StarkRandomSource->getRandomNumber(_size.y - 1);
+		fireFly.point3.x = StarkRandomSource->getRandomNumber(_size.x - 1);
+		fireFly.point3.y = StarkRandomSource->getRandomNumber(_size.y - 1);
+		fireFly.point4.x = StarkRandomSource->getRandomNumber(_size.x - 1);
+		fireFly.point4.y = StarkRandomSource->getRandomNumber(_size.y - 1);
+		fireFly.currentFrame = StarkRandomSource->getRandomNumber(_frames.size() - 1);
+	}
+}
+
+void VisualEffectFireFlies::update() {
+	for (uint i = 0; i < _fireFlies.size(); i++) {
+		FireFly &fireFly = _fireFlies[i];
+		fireFly.currentFrame++;
+
+		if (fireFly.currentFrame >= _frames.size()) {
+			fireFly.currentFrame %= _frames.size();
+
+			fireFly.point1 = fireFly.point2;
+			fireFly.point2 = fireFly.point3;
+			fireFly.point3 = fireFly.point4;
+			fireFly.point4.x = StarkRandomSource->getRandomNumber(_size.x - 1);
+			fireFly.point4.y = StarkRandomSource->getRandomNumber(_size.y - 1);
+		}
+	}
+
+	for (uint i = 0; i < _fireFlies.size(); i++) {
+		FireFly &fireFly = _fireFlies[i];
+		const Frame &frame = _frames[fireFly.currentFrame];
+
+		fireFly.currentPosition.x = fireFly.point1.x * frame.weight1 + fireFly.point2.x * frame.weight2
+		                            + fireFly.point3.x * frame.weight3 + fireFly.point4.x * frame.weight4;
+		fireFly.currentPosition.y = fireFly.point1.y * frame.weight1 + fireFly.point2.y * frame.weight2
+		                            + fireFly.point3.y * frame.weight3 + fireFly.point4.y * frame.weight4;
+	}
+}
+
+void VisualEffectFireFlies::drawFireFly(const FireFly &fly) {
+	if (fly.currentPosition.x < 0 || fly.currentPosition.x >= _surface->w
+	    || fly.currentPosition.y < 0 || fly.currentPosition.y >= _surface->h) {
+		return;
+	}
+
+	uint32 *pixel = static_cast<uint32 *>(_surface->getBasePtr(fly.currentPosition.x, fly.currentPosition.y));
+	*pixel = _frames[fly.currentFrame].color;
+}
+
+} // End of namespace Stark