GPU-based particle system supporting 1M real-time particles, force field interactions, collision detection, bloom post-processing, built with DX11 instancing and Compute Shader architecture.

• GPU-driven particle simulation via DirectX 11 Compute Shaders — emit, update, and cull entirely on the GPU with no per-particle CPU readback

• Ping-pong AliveList architecture for lock-free alive/dead particle routing across frames

• Single-dispatch multi-emitter emit via prefix sum and binary search, allowing all active emitters to emit in one Compute pass

• Definition / Instance separation — shared behavior templates instanced at runtime, with dirty-flag-driven partial uploads to minimize GPU bandwidth

• Multiple force types — Point Force with distance-based falloff, Vortex Force for tangential rotation, Linear Force for constant acceleration, Curl Noise for divergence-free turbulence via numerical curl of a 3D Perlin potential field, and Drag for velocity damping

• Collision detection via MRT collision texture — per-pixel material encoding enables constant-time collision queries at any scene complexity, with five configurable response types (None, Bounce, Die, Stick, Slow)

• FloatCurve / ColorCurve system driving size, rotation speed, color, and force strength over particle lifetime

• Texture2DArray with automatic POT normalization and per-texture UV scale, supporting variable-size textures in a single draw call

• DrawIndexedIndirect rendering — particle count never touches the CPU between simulation and draw

• Bloom post-processing via dual render target output and multi-pass Gaussian blur