Add powerup emitter. (#34)

Author: karnkaul

.clang-tidy

@@ -12,6 +12,7 @@ Checks: 'clang-analyzer-*,
 	portability-*,
 	readability-*,
 	-readability-identifier-length,
-	-readability-magic-numbers
+	-readability-magic-numbers,
+	-readability-redundant-member-init,
 	-readability-uppercase-literal-suffix'
 ...

assets/particles/powerup.json

@@ -0,0 +1,57 @@
+{
+  "asset_type": "ParticleEmitter",
+  "texture": "images/foam_bubble.png",
+  "config": {
+    "initial": {
+      "position": {
+        "lo": [
+          0.000000,
+          0.000000
+        ],
+        "hi": [
+          0.000000,
+          0.000000
+        ]
+      },
+      "rotation": 0.000000
+    },
+    "velocity": {
+      "linear": {
+        "angle": {
+          "lo": -180.000000,
+          "hi": 180.000000
+        },
+        "speed": {
+          "lo": -360.000000,
+          "hi": -80.000000
+        }
+      },
+      "angular": {
+        "lo": -90.000000,
+        "hi": 90.000000
+      }
+    },
+    "lerp": {
+      "scale": {
+        "lo": [
+          1.000000,
+          1.000000
+        ],
+        "hi": [
+          0.000000,
+          0.000000
+        ]
+      }
+    },
+    "ttl": {
+      "lo": 0.500000,
+      "hi": 1.000000
+    },
+    "quad_size": [
+      50.000000,
+      50.000000
+    ],
+    "count": 20,
+    "respawn": true
+  }
+}

src/spaced/spaced/game/powerups/pu_base.cpp

@@ -1,21 +1,40 @@
 #include <spaced/game/powerups/pu_base.hpp>
+#include <spaced/services/resources.hpp>
 
 namespace spaced {
-using bave::Circle;
+using bave::ParticleEmitter;
+using bave::RoundedQuad;
 using bave::Seconds;
 using bave::Shader;
 
 PUBase::PUBase(Services const& services, std::string_view const name) : m_services(&services), m_layout(&services.get<ILayout>()), m_name(name) {
-	auto circle = Circle{.diameter = 50.0f};
-	shape.set_shape(circle);
+	auto quad = RoundedQuad{};
+	quad.size = glm::vec2{40.0f};
+	quad.corner_radius = 12.5f;
+	shape.set_shape(quad);
+
+	auto const& resources = services.get<Resources>();
+	if (auto const pu_emitter = resources.get<ParticleEmitter>("particles/powerup.json")) { emitter = *pu_emitter; }
+
+	emitter.config.respawn = true;
 }
 
 void PUBase::tick(Seconds const dt) {
 	shape.transform.position.x -= speed * dt.count();
-	if (shape.transform.position.x < m_layout->get_play_area().lt.x - 0.5f * shape.get_shape().diameter) { m_destroyed = true; }
+	if (shape.transform.position.x < m_layout->get_play_area().lt.x - 0.5f * shape.get_shape().size.x) { m_destroyed = true; }
+
+	emitter.set_position(shape.transform.position);
+	if (!m_emitter_ticked) {
+		m_emitter_ticked = true;
+		emitter.pre_warm();
+	}
+	emitter.tick(dt);
 }
 
-void PUBase::draw(Shader& shader) const { shape.draw(shader); }
+void PUBase::draw(Shader& shader) const {
+	shape.draw(shader);
+	emitter.draw(shader);
+}
 
 void PUBase::activate(Player& player) {
 	do_activate(player);

src/spaced/spaced/game/powerups/pu_base.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <bave/core/time.hpp>
+#include <bave/graphics/particle_system.hpp>
 #include <bave/graphics/shape.hpp>
 #include <spaced/game/powerup.hpp>
 #include <spaced/services/layout.hpp>
@@ -19,14 +20,16 @@ class PUBase : public IPowerup {
 	[[nodiscard]] auto is_destroyed() const -> bool final { return m_destroyed; }
 
 	float speed{300.0f};
-	bave::CircleShape shape{};
+	bave::RoundedQuadShape shape{};
+	bave::ParticleEmitter emitter{};
 
   protected:
 	virtual void do_activate(Player& player) = 0;
 
 	bave::NotNull<Services const*> m_services;
 	bave::NotNull<ILayout const*> m_layout;
 	std::string_view m_name{};
+	bool m_emitter_ticked{};
 	bool m_destroyed{};
 };
 } // namespace spaced

src/spaced/spaced/game/powerups/pu_beam.cpp

@@ -4,7 +4,10 @@
 #include <spaced/services/styles.hpp>
 
 namespace spaced {
-PUBeam::PUBeam(Services const& services, int rounds) : PUBase(services, "Beam"), m_rounds(rounds) { shape.tint = services.get<Styles>().rgbas["gun_beam"]; }
+PUBeam::PUBeam(Services const& services, int rounds) : PUBase(services, "Beam"), m_rounds(rounds) {
+	emitter.config.lerp.tint.lo = emitter.config.lerp.tint.hi = shape.tint = services.get<Styles>().rgbas["gun_beam"];
+	emitter.config.lerp.tint.hi.channels.w = 0;
+}
 
 void PUBeam::do_activate(Player& player) {
 	auto beam = std::make_unique<GunBeam>(*m_services);

src/spaced/spaced/scenes/game.cpp

@@ -30,6 +30,7 @@ auto Game::get_manifest() -> AssetManifest {
 			{
 				"particles/exhaust.json",
 				"particles/explode.json",
+				"particles/powerup.json",
 			},
 	};
 }