[pull] master from beyond-all-reason:master - #96
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…ed) (#3191) * Nano Particles: add NanoParticleUpdate engine callin Batched, unsynced lifecycle events for nano particles, so deferred-lighting widgets can light them without polling. Nothing emits these yet; the standalone nano particle effect added in the following commit owns the batching and the sampling that decides which particles are reported. Events are passed as one flat numeric array of 13-entry records rather than a table per event, because a per-event table would dominate the cost of the callin at the rates involved. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * Nano Particles: add standalone nano particle effect Adds an optional nano particle effect that renders build spray as shader-generated 3D shapes with an additive halo, behind NanoParticlesGL4 (default off). Ported from BAR's gfx_nano_particles_gl4 gadget. The effect is not a projectile. Its particles have no projectile id, take no part in collision or quadfield work, are never handed to Lua as projectiles, and are not serialised; motion is analytic, so the shader reconstructs position from start/velocity/frame and the CPU only touches a particle when it homes or has to clear terrain. All of it lives in rts/Rendering/Env/NanoParticles: NanoParticleConfig every tunable, in one place NanoParticleDefs the PODs the other three share NanoParticleSystem the particle store, homing, ground clamp, LuaUI batching NanoParticleEmitter how much spray a builder produces, and reclaim bursts NanoParticleRenderer shaders, buffers, culling, draw Legacy nano spray is untouched. NanoProjectile, ProjectileDrawer and NanoPieceCache have no diff at all; when the effect is off, or no shader path is usable, emission falls through to CNanoProjectile exactly as before. The simulation cannot tell the difference either way: a work tick still polls QueryNanoPiece once and draws one synced RNG value, and everything the effect adds runs off the unsynced RNG, as nano spray already did. Beyond the shader look the effect also carries, each behind its own setting: * emission proportional to buildSpeed * buildPower rather than one particle per work tick, so a builder's spray tracks the work it is doing instead of its nano piece count, spread round-robin over its pieces * NanoParticlesHoming, particles following moving targets * NanoParticlesGroundClamp, particles routed over intervening terrain * NanoParticlesReclaimBurst, a burst when reclaiming a unit finishes, sized by metal cost and split across the builders that contributed * NanoParticlesUpdateLuaUI, the batched callin added in the previous commit The per-unit emission accumulators and the reclaim contributor tracking are owned by the emitter rather than by CBuilder/CUnit: they are unsynced presentation state, they must not be serialised, and no part of the sim needs to know they exist. No sim class gains a member. The renderer is heap-allocated behind a pointer, as the other GL-owning drawers are. A VBO's constructor calls VBO::IsSupported(), which latches the GLAD extension flags into function-local statics on its first call; constructing one before GLAD has loaded latches them all to false and silently turns every VBO in the process into a no-op. Particles show on the minimap as the legacy ones do, reusing the vertex arrays the world pass already filtered so it costs one walk and no visibility work, and filling the shared projectile minimap buffer rather than adding a draw of its own. The spawn gate is the effect's own rather than the legacy proportional one, which throttles from the first particle and so makes emission approach the budget asymptotically instead of scaling with NanoParticlesRate. Tunables are named and documented in NanoParticleConfig.h instead of being literals spread through the sources. The visual subset reaches both shader paths as uniforms, so the geometry and instanced renderers cannot drift apart. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * Nano Particles: changelog for the standalone effect Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * added `Engine.FeatureSupport.nanoParticlesGL4` boolean, so games can detect that the engine has the standalone nano particle effect and retire their own Lua implementation of it. * moved changelog to: doc\pr-changelogs\3191.md * Nano Particles: added configbool: NanoParticlesTargetLostFade "Nano particles fade out and shrink when the unit they were aimed at is destroyed, cancelled, or finished, instead of flying on into nothing" (ported over this feature from the gadget as well) --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
…n modifiers (#3336) * apply terrain speed mod to max speed for drag calculations
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