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-Context
-=======
-
-The context object represents the purest, most directly accessible, abilities
-of the device's 3D rendering pipeline.
-
-Methods
--------
-
-CSO State
-^^^^^^^^^
-
-All CSO state is created, bound, and destroyed, with triplets of methods that
-all follow a specific naming scheme. For example, ``create_blend_state``,
-``bind_blend_state``, and ``destroy_blend_state``.
-
-CSO objects handled by the context object:
-
-* :ref:`Blend`: ``*_blend_state``
-* :ref:`Sampler`: These are special; they can be bound to either vertex or
- fragment samplers, and they are bound in groups.
- ``bind_fragment_sampler_states``, ``bind_vertex_sampler_states``
-* :ref:`Rasterizer`: ``*_rasterizer_state``
-* :ref:`Depth, Stencil, & Alpha`: ``*_depth_stencil_alpha_state``
-* :ref:`Shader`: These have two sets of methods. ``*_fs_state`` is for
- fragment shaders, and ``*_vs_state`` is for vertex shaders.
-
-
-Resource Binding State
-^^^^^^^^^^^^^^^^^^^^^^
-
-This state describes how resources in various flavours (textures,
-buffers, surfaces) are bound to the driver.
-
-
-* ``set_constant_buffer``
-* ``set_framebuffer_state``
-* ``set_fragment_sampler_textures``
-* ``set_vertex_sampler_textures``
-* ``set_vertex_buffers``
-
-
-Non-CSO State
-^^^^^^^^^^^^^
-
-These pieces of state are too small, variable, and/or trivial to have CSO
-objects. They all follow simple, one-method binding calls, e.g.
-``set_edgeflags``.
-
-* ``set_edgeflags``
-* ``set_blend_color``
-* ``set_clip_state``
-* ``set_polygon_stipple``
-* ``set_scissor_state``
-* ``set_viewport_state``
-* ``set_vertex_elements``
-
-
-Clearing
-^^^^^^^^
-
-``clear`` initializes some or all of the surfaces currently bound to
-the framebuffer to particular RGBA, depth, or stencil values.
-
-Clear is one of the most difficult concepts to nail down to a single
-interface and it seems likely that we will want to add additional
-clear paths, for instance clearing surfaces not bound to the
-framebuffer, or read-modify-write clears such as depth-only or
-stencil-only clears of packed depth-stencil buffers.
-
-
-Drawing
-^^^^^^^
-
-``draw_arrays``
-
-``draw_elements``
-
-``draw_range_elements``
-
-
-Queries
-^^^^^^^
-
-Queries gather some statistic from the 3D pipeline over one or more
-draws. Queries may be nested, though no state tracker currently
-exercises this.
-
-Queries can be created with ``create_query`` and deleted with
-``destroy_query``. To enable a query, use ``begin_query``, and when finished,
-use ``end_query`` to stop the query. Finally, ``get_query_result`` is used
-to retrieve the results.
-
-Flushing
-^^^^^^^^
-
-``flush``
-
-
-Resource Busy Queries
-^^^^^^^^^^^^^^^^^^^^^
-
-``is_texture_referenced``
-
-``is_buffer_referenced``
-
-
-
-Blitting
-^^^^^^^^
-
-These methods emulate classic blitter controls. They are not guaranteed to be
-available; if they are set to NULL, then they are not present.
-
-These methods operate directly on ``pipe_surface`` objects, and stand
-apart from any 3D state in the context. Blitting functionality may be
-moved to a separate abstraction at some point in the future.
-
-``surface_fill`` performs a fill operation on a section of a surface.
-
-``surface_copy`` blits a region of a surface to a region of another surface,
-provided that both surfaces are the same format. The source and destination
-may be the same surface, and overlapping blits are permitted.
-
-The interfaces to these calls are likely to change to make it easier
-for a driver to batch multiple blits with the same source and
-destination.
-