diff options
Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/context.rst | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst index cdd84bf99cd..da847262c13 100644 --- a/src/gallium/docs/source/context.rst +++ b/src/gallium/docs/source/context.rst @@ -3,8 +3,12 @@ Context ======= -The context object represents the purest, most directly accessible, abilities -of the device's 3D rendering pipeline. +A Gallium rendering context encapsulates the state which effects 3D +rendering such as blend state, depth/stencil state, texture samplers, +etc. + +Note that resource/texture allocation is not per-context but per-screen. + Methods ------- @@ -12,20 +16,23 @@ 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``. +All Constant State Object (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:`Sampler`: Texture sampler states are bound separately for fragment, + vertex and geometry samplers. Note that sampler states are set en masse. + If M is the max number of sampler units supported by the driver and N + samplers are bound with ``bind_fragment_sampler_states`` then sampler + units N..M-1 are considered disabled/NULL. * :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. +* :ref:`Shader`: These are create, bind and destroy methods for vertex, + fragment and geometry shaders. * :ref:`Vertex Elements`: ``*_vertex_elements_state`` @@ -47,6 +54,9 @@ buffers, surfaces) are bound to the driver. * ``set_index_buffer`` +* ``set_stream_output_buffers`` + + Non-CSO State ^^^^^^^^^^^^^ @@ -96,7 +106,9 @@ to the array index which is used for sampling. * ``set_fragment_sampler_views`` binds an array of sampler views to fragment shader stage. Every binding point acquires a reference to a respective sampler view and releases a reference to the previous - sampler view. + sampler view. If M is the maximum number of sampler units and N units + is passed to set_fragment_sampler_views, the driver should unbind the + sampler views for units N..M-1. * ``set_vertex_sampler_views`` binds an array of sampler views to vertex shader stage. Every binding point acquires a reference to a respective |