Remove glu #23
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Remove glu #23
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In the OpenGL clip space the coordinates in each axis are expected to be in the range [-1, 1]. The GX API differs from this in that the z coordinate range is half of that: [-1, 0]. In order to work with this difference, we were modifying the glFrustum(), glOrtho() functions, as well as some glu functions, so that they'd compute a projection matrix suitable for the GX API. This had a series of disadvantages: - glGetFloatv() would return a projection matrix which is not the one expected by the client; - if the client manually built its own projection matrix, this could either not work at all, or render a scene very different from what was expected; - it forces opengx to reimplement some glu functions This commit fixes these issues by storing the projection matrix according to the OpenGL specifications, and transforms it to the GX clip space using a scale+transfor matrix. Note that the same transformation is applied to the function that we use to compute the near and far planes, which we need for the fog effect.
They will be provided by the respective libraries.
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These functions are used by glu.
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Please review commit by commit.
Includes #22