Version: 2018.3 (switch to 2019.1b or 2017.4)
LanguageEnglish
  • C#

Graphics.DrawProceduralIndirect

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

public static void DrawProceduralIndirect(MeshTopology topology, ComputeBuffer bufferWithArgs, int argsOffset = 0);

Parameters

topologyTopology of the procedural geometry.
bufferWithArgsBuffer with draw arguments.
argsOffsetByte offset where in the buffer the draw arguments are.

Description

Draws a fully procedural geometry on the GPU.

DrawProceduralIndirect does a draw call on the GPU, without any vertex or index buffers. The amount of geometry to draw is read from a ComputeBuffer. Typical use case is generating arbitrary amount of data from a ComputeShader and then rendering that, without requiring a readback to the CPU.

This is only useful on Shader Model 4.5 level hardware where shaders can read arbitrary data from ComputeBuffer buffers.

Buffer with arguments, bufferWithArgs, has to have four integer numbers at given argsOffset offset: vertex count per instance, instance count, start vertex location, start instance location. This very much maps to Direct3D11 DrawInstancedIndirect and equivalent functions on other graphics APIs. On OpenGL versions before 4.2 and all OpenGL ES versions that support indirect draw, the last argument is reserved and therefore must be zero.

Note that this call executes immediately, similar to Graphics.DrawMeshNow. It uses currently set render target, transformation matrices and currently set shader pass.

There's also a similar functionality in CommandBuffers, see CommandBuffer.DrawProceduralIndirect.

See Also: Graphics.DrawProcedural, ComputeBuffer.CopyCount, SystemInfo.supportsComputeShaders.

Did you find this page useful? Please give it a rating: