Create input data for a compute shader in URP

1. Create a graphics buffer, then add a handle to it in your pass data. For example:

   // Declare an input bufferpublic GraphicsBuffer inputBuffer;// Add a handle to the input buffer in your pass dataclass PassData{    ...    public BufferHandle input;}// Create the buffer in the render pass constructorpublic ComputePass(ComputeShader computeShader){    // Create the input buffer as a structured buffer    // Create the buffer with a length of 5 integers, so you can input 5 values.    inputBuffer = new GraphicsBuffer(GraphicsBuffer.Target.Structured, 5, sizeof(int));}

2. Set the data in the buffer. For example:

   var inputValues = new List<int> { 1, 2, 3, 4, 5 };inputBuffer.SetData(inputValues);

3. Use the

   ImportBuffer

   render graph API to convert the buffer to a handle the render graph system can use, then set the

   BufferHandle

   field in the pass data. For example:

   BufferHandle inputHandleRG = renderGraph.ImportBuffer(inputBuffer);passData.input = inputHandleRG;

4. Use the

   UseBuffer

   method to set the buffer as a readable buffer in the render graph system. For example:

   builder.UseBuffer(passData.input, AccessFlags.Read);

5. In your

   SetRenderFunc

   method, use the

   SetComputeBufferParam

   API to attach the buffer to the compute shader. For example:

   // The first parameter is the compute shader// The second parameter is the function that uses the buffer// The third parameter is the RWStructuredBuffer input variable to attach the buffer to// The fourth parameter is the handle to the input buffercontext.cmd.SetComputeBufferParam(passData.computeShader, passData.computeShader.FindKernel("Main"), "inputData", passData.input);

Example

Additional resources

• Compute shaders
• Writing shaders