ADD: Particle system

shaders/particles.frag

@@ -0,0 +1,26 @@
+#version 450
+
+layout(location = 0) in vec4 v_color;
+layout(location = 1) in vec2 v_uv;
+
+layout(location = 0) out vec4 outColor;
+
+void main()
+{
+    // Soft circular sprite.
+    vec2 p = v_uv * 2.0 - 1.0;
+    float r = length(p);
+    float mask = smoothstep(1.0, 0.0, r);
+
+    vec4 c = v_color;
+    c.rgb *= mask;
+    c.a *= mask;
+
+    if (c.a <= 0.001)
+    {
+        discard;
+    }
+
+    outColor = c;
+}
+