What is the PyOpenGL equivalent of
#define BUFFER_OFFSET(i) (reinterpret_cast<void*>(i))
glDrawElements(GL_TRIANGLE_STRIP, count, GL_UNSIGNED_SHORT, BUFFER_OFFSET(offset))
If the offset is 0, then
glDrawElements(GL_TRIANGLE_STRIP, count, GL_UNSIGNED_SHORT, None)
works, but I can not figure out how to specify a non-zero offset into a buffer object.
You can use OpenGL.arrays.vbo.VBO class for that:
from OpenGL.arrays import vbo
# data for your buffer
buf = vbo.VBO( [ 1,2,3,4,5,...], target = GL_ELEMENT_ARRAY_BUFFER )
# calls glBindBuffer
buf.bind()
# starts reading at 14-th byte
glDrawElements(GL_TRIANGLE_STRIP, count, GL_UNSIGNED_SHORT, buf + 14)
You're supposed to pass a ctypes
void pointer, which can constructed by :
ctypes.c_void_p(offset)
There seems to be a more PyOpenGL specific option using a VBO
class, and gotcha with some versions of PyOpenGL according to this .
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