C function copying to void *
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- Subject: C function copying to void *
- From: Michael Gogins <michael.gogins@...>
- Date: 2011年2月18日 22:54:26 -0500
local color_t = ffi.typeof('int[4]')
print('color_t:', color_t, ffi.sizeof(color_t))
local color = color_t()
-- void glReadPixels (GLint x, GLint y, GLsizei width,
GLsizei height, GLenum format, GLenum type, GLvoid * pixels);
gl.glReadPixels(x, y, 1, 1, gl.GL_RGB, gl.GL_INT, color)
-- gl.glReadPixels(x, y, 1, 1, gl.GL_RGB, gl.GL_INT,
ffi.cast('void *', color))
Whichever of the two forms of glReadPixels I call above, I get the
same runtime error (Ubuntu 10.04):
Z:\home\mkg\Downloads\malkia-luajit-opencl-e559146\luajit:
../../scripts/ChordSpaceView.lua:488: cannot convert 'void *' to 'int'
It it possible to do this -- allow the C function to copy data into an
address pointed to by a void pointer, then type cast the copied data
back to an array of elementary types?
All the other OpenGL functions I use in this program work fine.
Regards,
Mike Gogins