1 files changed, 99 insertions, 0 deletions
diff --git a/src/particle.cpp b/src/particle.cpp
new file mode 100644
index 0000000..8090e2d
--- /dev/null
+++ b/src/particle.cpp
@@ -0,0 +1,99 @@
+#include <particle.hpp>
+
+#include <engine.hpp>
+#include <render.hpp>
+#include <world.hpp>
+
+ParticleSystem::ParticleSystem(int count, bool m)
+	: max(m)
+{
+	parts.reserve(count);
+}
+
+void ParticleSystem::add(const vec2& pos, const ParticleType& type)
+{
+	// TODO enforce max
+	//if (max && parts.size() >= std::end(parts))
+	//	return;
+
+	parts.emplace_back(pos, type);
+}
+
+void ParticleSystem::addMultiple(const int& count, const ParticleType& type, std::function<vec2(void)> f)
+{
+	int togo = count;
+	while (togo-- > 0)
+		parts.emplace_back(f(), type);
+}
+
+void ParticleSystem::render(void) const
+{
+	static const GLfloat tex[12] = {
+		0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0
+	};
+
+	Render::worldShader.use();
+	Render::worldShader.enable();
+	Colors::blue.use();
+
+	for (const auto& p : parts) {
+		GLfloat coord[18] = {
+			p.location.x, p.location.y, -1,
+			p.location.x, p.location.y + 5, -1,
+			p.location.x + 5, p.location.y + 5, -1,
+			p.location.x + 5, p.location.y + 5, -1,
+			p.location.x + 5, p.location.y, -1,
+			p.location.x, p.location.y, -1
+		};
+
+		glVertexAttribPointer(Render::worldShader.coord, 3, GL_FLOAT, GL_FALSE, 0, coord);
+		glVertexAttribPointer(Render::worldShader.tex, 2, GL_FLOAT, GL_FALSE, 0, tex);
+		glDrawArrays(GL_TRIANGLES, 0, 6);
+	}
+
+	Render::worldShader.disable();
+	Render::worldShader.unuse();
+}
+
+void ParticleSystem::update(entityx::EntityManager &en, entityx::EventManager &ev, entityx::TimeDelta dt)
+{
+	(void)en;
+	(void)ev;
+	(void)dt; // TODO use for time to die
+
+	auto& worldSystem = *game::engine.getSystem<WorldSystem>();
+
+	for (auto part = std::begin(parts); part != std::end(parts); part++) {
+		auto& p = *part;
+
+		// update timers
+		p.timeLeft -= dt;
+		if (p.timeLeft <= 0)
+			parts.erase(part);
+
+		// update movement
+		switch (p.type) {
+		case ParticleType::Drop:
+			if (p.velocity.y > -.5)
+				p.velocity.y -= 0.001f;
+			break;
+		case ParticleType::Confetti:
+			break;
+		}
+
+		// really update movement
+		p.location.x += p.velocity.x * dt;
+		p.location.y += p.velocity.y * dt;
+
+		// world collision
+		auto height = worldSystem.isAboveGround(p.location);
+		if (height != 0)
+			p.location.y = height + 5, p.velocity.y = randGet() % 10 / 40.0f;
+	}
+}
+
+int ParticleSystem::getCount(void) const
+{
+	return parts.size();
+}
+