Contents
- 1 How to create a compute shader-win32 apps?
- 2 How to optimize GPU performance with large shaders?
- 3 How to optimize compute shader with shared memory?
- 4 Why are compute shaders a single stage program?
- 5 What’s the difference between compute shaders and OpenGL?
- 6 How to pass input to a shader game?
- 7 How to compute shaders on a graphics card?
How to create a compute shader-win32 apps?
To create a compute shader: Compile the HLSL shader code by calling D3DCompileFromFile. UINT flags = D3DCOMPILE_ENABLE_STRICTNESS; #if defined ( DEBUG ) || defined ( _DEBUG ) flags |= D3DCOMPILE_DEBUG; #endif // Prefer higher CS shader profile when possible as CS 5.0 provides better performance on 11-class hardware.
How to optimize GPU performance with large shaders?
Sebastian is going to cover an interesting problem he faced while working on Claybook: how you can optimize GPU occupancy and resource usage of compute shaders that use large thread groups. When using a compute shader, it is important to consider the impact of thread group size on performance.
How does thread size affect compute shader performance?
When using a compute shader, it is important to consider the impact of thread group size on performance. Limited register space, memory latency and SIMD occupancy each affect shader performance in different ways.
I have a first version working that uses a Shader Storage Buffer Object. I dispatch a thread per cell I want to update and that thread samples the SSBO 8 times to gather the cell’s neighbors. This works fine. I’m now trying to optimize this by using shared memory.
Why are compute shaders a single stage program?
To address this, Compute Shaders are a new single-stage program. They are launched in a manner that is essentially stateless. This allows arbitrary workloads to be sent to the graphics hardware with minimal disturbance to the GL state machine.
How is a Mesh Shader used in a cluster?
The task shader typically culls one meshlet per thread. Like compute shaders performing cluster culling, it is common to use a bounding shape for frustum or occlusion tests and a cone to approximate the triangle normals in the cluster for back-face culling.
What’s the difference between compute shaders and OpenGL?
• Compute Shaders use the GLSL language, something that all OpenGL programmers should already be familiar with (or will be soon). • Compute shaders use the same context as does the OpenGL rendering pipeline. There is no need to acquire and release the context as OpenGL+OpenCLmust do.
How to pass input to a shader game?
I’ve seen some samples use a constant buffer (cbuffer), but it seems very restrictive to me (in the hlsl cbuffer declaration I’d have to specify the amount of input (e.g. if a want to process an array of floats, I’d have to declare in my hlsl cbuffer an array of floats with a specific number of elements).
What is the main function of a compute shader?
A compute shader needs to contain a main function known as a kernel, indicated via the #pragma kernel directive followed by a name, like #pragma surface of our surface shader. Add this directive as the first and currently only line, using the name FunctionKernel.
How to compute shaders on a graphics card?
Compute Shaders 1 Store positions in a compute buffer. 2 Let the GPU do most of the work. 3 Procedurally draw many cubes. 4 Copy the entire function library to the GPU. More