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Unigine::CPUShader Class

Header: #include <UnigineThread.h>

This class is used to create a custom CPU shader, for example, to implement multi-threaded mesh cluster update. Your custom CPU-shader must be inherited from this class. The corresponding sample is included in the SDK(/samples/Api/Systems/CPUShader/). Engine::swap() always waits for CPU shaders, therefore they cannot be used as tasks. CPU shader is updated with the current framerate of the application.

Here is an example of implementing a custom CPU shader:

Source code (C++)
struct UpdateClustersCPUShader: public CPUShader
{
	UpdateClustersCPUShader() {}
	virtual ~UpdateClustersCPUShader() 
	{ 
		// wait until all asynchronous operations are completed
		wait(); 
	}

	Vector<AsyncCluster> clusters;

	volatile int counter{0};
	
	// overriding the process method to performa our calculations
	void process(int thread_num, int threads_count) override
	{
		UNIGINE_PROFILER_FUNCTION;

		while (true)
		{
			int num = AtomicAdd(&counter, 1);
			if (num >= clusters.size())
				break;
			clusters[num].update();
		}
	}

	void run()
	{
		for (auto &c : clusters)
			c.swap();

		counter = 0;
		
		// running shader code in asynchronous mode
		runAsync();
	}
};

CPUShader Class

Members


static CPUShaderPtr create ( ) #

Default CPUShader class constructor.

void runSync ( int threads_count ) #

Runs CPU shader code synchronously. This method is blocking. No additional threads are created, as the Engine's thread pool is used.

Arguments

  • int threads_count - Number of threads to be used. The default value of -1 sets the number of threads equal to the number of CPU cores.

void runAsync ( int threads_count ) #

Runs CPU shader code asynchronously. This method is non-blocking. No additional threads are created, as the Engine's thread pool is used.

Arguments

  • int threads_count - Number of threads to be used. The default value of -1 sets the number of threads equal to the number of CPU cores.

void wait ( ) #

Waits for running asynchronous shader code execution.

int isRunning ( ) #

Returns a value indicating if the CPU shader code is currently executed.

Return value

1 if the shader code is currently executed; otherwise, 0.

int getNumThreads ( ) #

Returns the currently used number of threads.

Return value

Number of currently used threads.

virtual void process ( int thread_num, int threads_count ) #

Override this method to implement calculations.

Arguments

  • int thread_num - Current thread number. This number is not a thread ID, it just a virtual number.
  • int threads_count - Number of threads to be used. The default value of -1 sets the number of threads equal to the number of CPU cores.
Last update: 2020-04-10