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Python API: allow passing None to some BGL functions instead of bgl.Buffer 

Many OpenGL functions take NULL pointers, passing those was quite complicated
with some addons even using ctypes to manipulate internal bgl.Buffer pointers.
This commit is contained in:
Brecht Van Lommel 2019-03-26 19:48:44 +01:00
parent c515ea2e93
commit 85915ae1aa
1 changed files with 19 additions and 3 deletions
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22
source/blender/python/generic/bgl.c
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@ -132,9 +132,9 @@
#define GLclampfP_def(number) Buffer *bgl_buffer##number
#endif
#define GLvoidP_str "O!"
#define GLvoidP_var(number) (bgl_buffer##number)->buf.asvoid
#define GLvoidP_ref(number) &BGL_bufferType, &bgl_buffer##number
#define GLvoidP_str "O&"
#define GLvoidP_var(number) ((bgl_buffer##number) ? (bgl_buffer##number)->buf.asvoid : NULL)
#define GLvoidP_ref(number) BGL_BufferOrNoneConverter, &bgl_buffer##number
#define GLvoidP_def(number) Buffer *bgl_buffer##number
#define GLsizeiP_str "O!"
@ -703,6 +703,22 @@ Buffer *BGL_MakeBuffer(int type, int ndimensions, int *dimensions, void *initbuf
return buffer;
}
/* Custom converter function so we can support a buffer or NULL. */
static int BGL_BufferOrNoneConverter(PyObject *object, Buffer **buffer)
{
if (object == Py_None) {
*buffer = NULL;
return 1;
}
else if (PyObject_TypeCheck(object, &BGL_bufferType)) {
*buffer = (Buffer *)object;
return 1;
}
else {
PyErr_SetString(PyExc_TypeError, "expected a bgl.Buffer or None");
return 0;
}
}
#define MAX_DIMENSIONS 256
static PyObject *Buffer_new(PyTypeObject *UNUSED(type), PyObject *args, PyObject *kwds)