CODEWITHSUNDEEP
c++openglcompute-shader
Strawhare
Strawhare

Reputation: 486

How can I access the size of a Compute Shader's local work group from the CPU?

Given a compute shader where I have set the local size of each dimension to the values x, y and z, is there any way for me to access that information from the c++ code? ie,

//Pseudo Code c++
int size[3]
x = get local sizes from linked compute shader
print(x);

//GLSL Code
layout (local_size_x = a number, local_size_y = a number, local_size_z = a number) in;

Upvotes: 3

Views: 1390

Answers (1)

Strawhare
Strawhare

Reputation: 486

Having run around looking, I found the following on Khronos.org, on its page concerning glGetProgramiv, found here:

https://www.khronos.org/registry/OpenGL-Refpages/es3/html/glGetProgramiv.xhtml

GL_COMPUTE_WORK_GROUP_SIZE params returns an array of three integers containing the local work group size of the compute program as specified by its input layout qualifier(s). program must be the name of a program object that has been previously linked successfully and contains a binary for the compute shader stage.

This makes the line I needed

glGetProgramiv(ComputeShaderID, GL_COMPUTE_WORK_GROUP_SIZE, localWorkGroupSize);

where localWorkGroupSize is an array of 3 integers.

Upvotes: 4

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