explosion effect is looking nice

assets/shaders/mask.fs

@@ -5,11 +5,13 @@ precision mediump float;
 // Input vertex attributes (from vertex shader)
 varying vec3 fragPosition;
 
+uniform float alpha;
+
 void main() {
     // Texel color fetching from texture sampler
 
     // NOTE: Implement here your fragment shader code
 
-    gl_FragColor = vec4(fragPosition, 1.0);
+    gl_FragColor = vec4(fragPosition, alpha);
 
 }

sources/Component/Shaders/Items/BombExplosionShaderComponent.hpp

@@ -19,6 +19,11 @@ namespace BBM
 		float explosionRadius = 4;
 		//! @brief to have the shader move by the time
 		float frameCounter = 0;
+		//! @brief Transparency
+		float alpha = 1;
+
+		//! @brief max explosion radius
+		static constexpr float maxRadius = 1.2;
 
 		//! @brief The clock to use
 		std::chrono::nanoseconds clock = 0ns;

sources/System/BombHolder/BombHolderSystem.cpp

@@ -58,13 +58,17 @@ namespace BBM
 				if (duration_cast<std::chrono::milliseconds>(ctx.clock).count() <= 10)
 					return;
 				ctx.clock = 0ns;
-				ctx.explosionRadius -= 0.3;
-				if (ctx.explosionRadius < 1.2) {
-					ctx.explosionRadius = 1.2;
+				ctx.explosionRadius -= 1;
+				if (ctx.explosionRadius < BombExplosionShaderComponent::maxRadius) {
+					ctx.explosionRadius = BombExplosionShaderComponent::maxRadius;
+					ctx.alpha -= 0.1;
+					// slow the explosion movement
+					ctx.frameCounter -= 0.1;
 				}
+				ctx.frameCounter += 0.2;
 				shader.shader.setShaderUniformVar("frame", ctx.frameCounter);
+				shader.shader.setShaderUniformVar("alpha", ctx.alpha);
 				shader.shader.setShaderUniformVar("radius", ctx.explosionRadius);
-				ctx.frameCounter += 0.1;
 			})
 			.addComponent<TimerComponent>(500ms, [](WAL::Entity &explosion, WAL::Wal &wal) {
 				explosion.scheduleDeletion();