OpenFL GPU particles support!

rainy · July 21, 2021, 1:13am

Oh, yes, it may be a regional problem. I can’t access it.

rainy · July 21, 2021, 6:23am

When using ShaderBuffer.update, it will consume a lot of performance. Is there a better way to update the Buffer?

The value of paramDataLength is extremely large. If there are 1000 particles, there will be a length of 190000+.

If I just update the time, can I avoid updating it frequently?

rainy · July 21, 2021, 12:00pm

I implemented a ShaderBuffer update method and optimized performance. Now 10000 particles can be maintained at about 20 - 30FPS.

GiG · July 21, 2021, 2:15pm

1W? Do you mean 1M, 1 million?

rainy · July 21, 2021, 2:36pm

Sorry, it is 10000

GiG · July 21, 2021, 4:00pm

Good result indeed! What did you do to optimize the update?

rainy · July 22, 2021, 1:11am

github.com

rainyt/openfl-gpu-particles/blob/18d1372b318f35ea9f57cb47ff49c9868a4e591f/src/openfl/shader/utils/ShaderBufferUtils.hx#L143-L170


					// 判断粒子对象，是否更新，需要更新的才从这里进行刷新
					// Todo : 是否可以判断当前属性是否需要刷新，而不是全部刷新
					for (index => value in updateParams.childs) {
						var indexAt = value.id;
						var indexLen = 0;
						if (floatParam.type == FLOAT) {
							indexAt *= 6;
							indexLen = 1;
						} else if (floatParam.type == FLOAT2) {
							indexAt *= 12;
							indexLen = 2;
						} else if (floatParam.type == FLOAT3) {
							indexAt *= 18;
							indexLen = 3;
						} else if (floatParam.type == FLOAT4) {
							indexAt *= 24;
							indexLen = 4;
						}
						var indexJAt = 0;
						for (j in 0...6) {

This file has been truncated. show original

The main optimization here is that particles that do not need to be updated do not update their data. If only the life time is updated, the performance of the particle will be better, and a parameter may be needed to control it. If only the life time is updated, a certain amount of randomness will be lost.

rainy · July 22, 2021, 2:12am

Release openfl-gpu-particles v0.0.4:

New: Added copy support, copy attributes.
Improvement: The improvement will synchronize the effect according to the zoom ratio of the Sprite.
Added: Added randomLife random life parameter, if you don’t want random parameters, please set it to 0.
New: Added GPUArrayAttribute array parameter, which can fix the queue parameter value.
Fix: Fix the problem that random values would disrupt the survival status.
Optimization: Optimize the data update performance of ShaderBuffer.

rainy · July 27, 2021, 2:09am

Discussion: is it better to use ‘OpenglRenderer’ to implement GPU particles?