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The drawIndirect() method of the GPURenderPassEncoder interface draws primitives using parameters read from a GPUBuffer.
drawIndirect(indirectBuffer, indirectOffset)
indirectBuffer
A GPUBuffer containing the vertexCount, instanceCount, firstVertex, and firstInstance values needed to carry out the drawing operation. The buffer must contain a tightly packed block of four 32-bit unsigned integer values representing the values (16 bytes total), given in the same order as the arguments for GPURenderPassEncoder.draw(). So for example:
const uint32 = new Uint32Array(4);
uint32[0] = 3; // The vertexCount value
uint32[1] = 1; // The instanceCount value
uint32[2] = 0; // The firstVertex value
uint32[3] = 0; // The firstInstance value
// Write values into a GPUBuffer
device.queue.writeBuffer(buffer, 0, uint32, 0, uint32.length);
Note: The indirect-first-instance feature needs to be enabled for non-zero firstInstance values to be used. If the indirect-first-instance feature is not enabled and firstInstance is not zero, the drawIndirect() call will be treated as a no-op.
indirectOffset
The offset, in bytes, into indirectBuffer where the value data begins.
None (Undefined).
The following criteria must be met when calling drawIndirect(), otherwise a GPUValidationError is generated and the GPURenderPassEncoder becomes invalid:
indirectBuffer's GPUBuffer.usage contains the GPUBufferUsage.INDIRECT flag.indirectOffset + the total size specified by the value parameters in the indirectBuffer is less than or equal to the indirectBuffer's GPUBuffer.size.indirectOffset is a multiple of 4.// â¦
// Create GPURenderPassEncoder
const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
// Set pipeline and vertex buffer
passEncoder.setPipeline(renderPipeline);
passEncoder.setVertexBuffer(0, vertexBuffer);
// Create drawIndirect values
const uint32 = new Uint32Array(4);
uint32[0] = 3;
uint32[1] = 1;
uint32[2] = 0;
uint32[3] = 0;
// Create a GPUBuffer and write the draw values into it
const drawValues = device.createBuffer({
size: 16,
usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.INDIRECT,
});
device.queue.writeBuffer(drawValues, 0, uint32, 0, uint32.length);
// Draw the vertices
passEncoder.drawIndirect(drawValues, 0);
// End the render pass
passEncoder.end();
// End frame by passing array of GPUCommandBuffers to command queue for execution
device.queue.submit([commandEncoder.finish()]);
// â¦
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