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Diffstat (limited to 'src/gallium/docs/source/context.rst')
| -rw-r--r-- | src/gallium/docs/source/context.rst | 55 |
1 files changed, 16 insertions, 39 deletions
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst index 4e35a4c4082..f241411a002 100644 --- a/src/gallium/docs/source/context.rst +++ b/src/gallium/docs/source/context.rst @@ -45,6 +45,7 @@ buffers, surfaces) are bound to the driver. * ``set_vertex_buffers`` +* ``set_index_buffer`` Non-CSO State ^^^^^^^^^^^^^ @@ -132,50 +133,26 @@ this surface need not be bound to the framebuffer. Drawing ^^^^^^^ -``draw_arrays`` draws a specified primitive. +``draw_vbo`` draws a specified primitive. The primitive mode and other +properties are described by ``pipe_draw_info``. -This command is equivalent to calling ``draw_arrays_instanced`` -with ``startInstance`` set to 0 and ``instanceCount`` set to 1. +The ``mode``, ``start``, and ``count`` fields of ``pipe_draw_info`` specify the +the mode of the primitive and the vertices to be fetched, in the range between +``start`` to ``start``+``count``-1, inclusive. -``draw_elements`` draws a specified primitive using an optional -index buffer. +Every instance with instanceID in the range between ``start_instance`` and +``start_instance``+``instance_count``-1, inclusive, will be drawn. -This command is equivalent to calling ``draw_elements_instanced`` -with ``startInstance`` set to 0 and ``instanceCount`` set to 1. +All vertex indices must fall inside the range given by ``min_index`` and +``max_index``. In case non-indexed draw, ``min_index`` should be set to +``start`` and ``max_index`` should be set to ``start``+``count``-1. -``draw_range_elements`` +``index_bias`` is a value added to every vertex index before fetching vertex +attributes. It does not affect ``min_index`` and ``max_index``. -XXX: this is (probably) a temporary entrypoint, as the range -information should be available from the vertex_buffer state. -Using this to quickly evaluate a specialized path in the draw -module. - -``draw_arrays_instanced`` draws multiple instances of the same primitive. - -This command is equivalent to calling ``draw_elements_instanced`` -with ``indexBuffer`` set to NULL and ``indexSize`` set to 0. - -``draw_elements_instanced`` draws multiple instances of the same primitive -using an optional index buffer. - -For instanceID in the range between ``startInstance`` -and ``startInstance``+``instanceCount``-1, inclusive, draw a primitive -specified by ``mode`` and sequential numbers in the range between ``start`` -and ``start``+``count``-1, inclusive. - -If ``indexBuffer`` is not NULL, it specifies an index buffer with index -byte size of ``indexSize``. The sequential numbers are used to lookup -the index buffer and the resulting indices in turn are used to fetch -vertex attributes. - -If ``indexBuffer`` is NULL, the sequential numbers are used directly -as indices to fetch vertex attributes. - -``indexBias`` is a value which is added to every index read from the index -buffer before fetching vertex attributes. - -``minIndex`` and ``maxIndex`` describe minimum and maximum index contained in -the index buffer. +If there is an index buffer bound, and ``indexed`` field is true, all vertex +indices will be looked up in the index buffer. ``min_index``, ``max_index``, +and ``index_bias`` apply after index lookup. If a given vertex element has ``instance_divisor`` set to 0, it is said it contains per-vertex data and effective vertex attribute address needs |