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Passing data to external libs · Zuzu-Typ/PyGLM Wiki · GitHub
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Passing data to external libs
Zuzu-Typ edited this page Jul 2, 2020
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If you ever come across a situation where you need to pass data from PyGLM's data types to another library that uses external C code, you should be able to accomplish your goal doing the following:
It doesn't matter which kind of PyGLM type you have, but let's pretend you have a 4x4 matrix that you need to pass to PyOpenGL.
# a very important identity matrix
m = glm.mat4()
# a ctypes pointer to m's data
ptr = glm.value_ptr(m)
# size of m's data in bytes (here 4 * 4 * 4 = 64 bytes)
nbytes = glm.sizeof(m)
glBufferData(GL_UNIFORM_BUFFER, nbytes, ptr, GL_STATIC_DRAW)
This also works for any vector, quaternion or array type.
You can take a shortcut for arrays though:
arr = glm.array(glm.mat4(1), glm.mat4(2), glm.mat4(3))
glBufferData(GL_UNIFORM_BUFFER, arr.nbytes, arr.ptr, GL_STATIC_DRAW)
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