mirror of https://gitlab.freedesktop.org/mesa/mesa
295 lines
10 KiB
ReStructuredText
295 lines
10 KiB
ReStructuredText
Graphics state
|
|
==============
|
|
|
|
The Mesa Vulkan runtime provides helpers for managing the numerous pieces
|
|
of graphics state associated with a ``VkPipeline`` or set dynamically on a
|
|
command buffer. No such helpers are provided for compute or ray-tracing
|
|
because they have little or no state besides the shaders themselves.
|
|
|
|
|
|
Pipeline state
|
|
--------------
|
|
|
|
All (possibly dynamic) Vulkan graphics pipeline state is encapsulated into
|
|
a single :c:struct:`vk_graphics_pipeline_state` structure which contains
|
|
pointers to sub-structures for each of the different state categories.
|
|
Unlike :c:type:`VkGraphicsPipelineCreateInfo`, the pointers in
|
|
:c:struct:`vk_graphics_pipeline_state` are guaranteed to be either be
|
|
NULL or point to valid and properly populated memory.
|
|
|
|
When creating a pipeline, the
|
|
:c:func:`vk_graphics_pipeline_state_fill()` function can be used to
|
|
gather all of the state from the core structures as well as various ``pNext``
|
|
chains into a single state structure. Whenever an extension struct is
|
|
missing, a reasonable default value is provided whenever possible.
|
|
|
|
|
|
:c:func:`vk_graphics_pipeline_state_fill()` automatically handles both
|
|
the render pass and dynamic rendering. For drivers which use
|
|
:c:struct:`vk_render_pass`, the :c:struct:`vk_render_pass_state`
|
|
structure will be populated as if for dynamic rendering, regardless of
|
|
which path is used. Drivers which use their own render pass structure
|
|
should parse the render pass, if available, and pass a
|
|
:c:struct:`vk_render_pass_state` to the ``driver_rp`` argument of
|
|
:c:func:`vk_graphics_pipeline_state_fill()` with the relevant information
|
|
from the specified subpass. If a render pass is available,
|
|
:c:struct:`vk_render_pass_state` will be populated with the
|
|
the information from the :c:struct:`driver_rp`. If dynamic
|
|
rendering is used or the driver provides a ``NULL``
|
|
:c:struct:`driver_rp`, the :c:struct:`vk_render_pass_state`
|
|
structure will be populated for dynamic rendering, including color, depth,
|
|
and stencil attachment formats.
|
|
|
|
The usual flow for creating a full graphics pipeline (not library) looks
|
|
like this:
|
|
|
|
.. code-block:: c
|
|
|
|
struct vk_graphics_pipeline_state state = { };
|
|
struct vk_graphics_pipeline_all_state all;
|
|
vk_graphics_pipeline_state_fill(&device->vk, &state, pCreateInfo,
|
|
NULL, &all, NULL, 0, NULL);
|
|
|
|
/* Emit stuff using the state in `state` */
|
|
|
|
The :c:struct:`vk_graphics_pipeline_all_state` structure exists to allow
|
|
the state to sit on the stack instead of requiring a heap allocation. This
|
|
is useful if you intend to use the state right away and don't need to store
|
|
it. For pipeline libraries, it's likely more useful to use the dynamically
|
|
allocated version and store the dynamically allocated memory in the
|
|
library pipeline.
|
|
|
|
.. code-block:: c
|
|
|
|
/* Assuming we have a vk_graphics_pipeline_state in pipeline */
|
|
memset(&pipeline->state, 0, sizeof(pipeline->state));
|
|
|
|
for (uint32_t i = 0; i < lib_info->libraryCount; i++) {
|
|
VK_FROM_HANDLE(drv_graphics_pipeline_library, lib, lib_info->pLibraries[i]);
|
|
vk_graphics_pipeline_state_merge(&pipeline->state, &lib->state);
|
|
}
|
|
|
|
/* This assumes you have a void **state_mem in pipeline */
|
|
result = vk_graphics_pipeline_state_fill(&device->vk, &pipeline->state,
|
|
pCreateInfo, NULL, NULL, pAllocator,
|
|
VK_SYSTEM_ALLOCATION_SCOPE_OBJECT,
|
|
&pipeline->state_mem);
|
|
if (result != VK_SUCCESS)
|
|
return result;
|
|
|
|
State from dependent libraries can be merged together using
|
|
:c:func:`vk_graphics_pipeline_state_merge`.
|
|
:c:func:`vk_graphics_pipeline_state_fill` will then only attempt to
|
|
populate missing fields. You can also merge dependent pipeline libraries
|
|
together but store the final state on the stack for immediate consumption:
|
|
|
|
.. code-block:: c
|
|
|
|
struct vk_graphics_pipeline_state state = { };
|
|
|
|
for (uint32_t i = 0; i < lib_info->libraryCount; i++) {
|
|
VK_FROM_HANDLE(drv_graphics_pipeline_library, lib, lib_info->pLibraries[i]);
|
|
vk_graphics_pipeline_state_merge(&state, &lib->state);
|
|
}
|
|
|
|
struct vk_graphics_pipeline_all_state all;
|
|
vk_graphics_pipeline_state_fill(&device->vk, &state, pCreateInfo,
|
|
NULL, &all, NULL, 0, NULL);
|
|
|
|
.. c:autofunction:: vk_graphics_pipeline_state_fill
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
.. c:autofunction:: vk_graphics_pipeline_state_merge
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
|
|
Dynamic state
|
|
-------------
|
|
|
|
All dynamic states in Vulkan, regardless of which API version or extension
|
|
introduced them, are represented by the
|
|
:c:enum:`mesa_vk_dynamic_graphics_state` enum. This corresponds to the
|
|
:c:type:`VkDynamicState` enum in the Vulkan API only it's compact (has no
|
|
holes due to extension namespacing) and a bit better organized. Each
|
|
enumerant is named with the name of the state group to which the dynamic
|
|
state belongs as well as the name of the dynamic state itself. The fact
|
|
that it's compact allows us to use to index bitsets.
|
|
|
|
.. c:autofunction:: vk_get_dynamic_graphics_states
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
We also provide a :c:struct:`vk_dynamic_graphics_state` structure which
|
|
contains all the dynamic graphics states, regardless of which API version
|
|
or extension introduced them. This structure can be populated from a
|
|
:c:struct:`vk_graphics_pipeline_state` via
|
|
:c:func:`vk_dynamic_graphics_state_init`.
|
|
|
|
.. c:autofunction:: vk_dynamic_graphics_state_init
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
.. c:autofunction:: vk_dynamic_graphics_state_copy
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
There is also a :c:struct:`vk_dynamic_graphics_state` embedded in
|
|
:c:struct:`vk_command_buffer`. Should you choose to use them, we provide
|
|
common implementations for all ``vkCmdSet*()`` functions. Two additional
|
|
functions are provided for the driver to call in ``CmdBindPipeline()`` and
|
|
``CmdBindVertexBuffers2()``:
|
|
|
|
.. c:autofunction:: vk_cmd_set_dynamic_graphics_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
.. c:autofunction:: vk_cmd_set_vertex_binding_strides
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
To use the dynamic state framework, you will need the following in your
|
|
pipeline structure:
|
|
|
|
.. code-block:: c
|
|
|
|
struct drv_graphics_pipeline {
|
|
....
|
|
struct vk_vertex_input_state vi_state;
|
|
struct vk_sample_locations_state sl_state;
|
|
struct vk_dynamic_graphics_state dynamic;
|
|
...
|
|
};
|
|
|
|
Then, in your pipeline create function,
|
|
|
|
.. code-block:: c
|
|
|
|
memset(&pipeline->dynamic, 0, sizeof(pipeline->dynamic));
|
|
pipeline->dynamic->vi = &pipeline->vi_state;
|
|
pipeline->dynamic->ms.sample_locations = &pipeline->sl_state;
|
|
vk_dynamic_graphics_state_init(&pipeline->dynamic, &state);
|
|
|
|
In your implementation of ``vkCmdBindPipeline()``,
|
|
|
|
.. code-block:: c
|
|
|
|
vk_cmd_set_dynamic_graphics_state(&cmd->vk, &pipeline->dynamic_state);
|
|
|
|
And, finally, at ``vkCmdDraw*()`` time, the code to emit dynamic state into
|
|
your hardware command buffer will look something like this:
|
|
|
|
.. code-block:: c
|
|
|
|
static void
|
|
emit_dynamic_state(struct drv_cmd_buffer *cmd)
|
|
{
|
|
struct vk_dynamic_graphics_state *dyn = &cmd->vk.dynamic_graphics_state;
|
|
|
|
if (!vk_dynamic_graphics_state_any_dirty(dyn))
|
|
return;
|
|
|
|
if (BITSET_TEST(dyn->dirty, MESA_VK_DYNAMIC_VP_VIEWPORTS) |
|
|
BITSET_TEST(dyn->dirty, MESA_VK_DYNAMIC_VP_VIEWPORT_COUNT)) {
|
|
/* Re-emit viewports */
|
|
}
|
|
|
|
if (BITSET_TEST(dyn->dirty, MESA_VK_DYNAMIC_VP_SCISSORS) |
|
|
BITSET_TEST(dyn->dirty, MESA_VK_DYNAMIC_VP_SCISSOR_COUNT)) {
|
|
/* Re-emit scissors */
|
|
}
|
|
|
|
/* etc... */
|
|
|
|
vk_dynamic_graphics_state_clear_dirty(dyn);
|
|
}
|
|
|
|
Any states used by the currently bound pipeline and attachments are always
|
|
valid in ``vk_command_buffer::dynamic_graphics_state`` so you can always
|
|
use a state even if it isn't dirty on this particular draw.
|
|
|
|
.. c:autofunction:: vk_dynamic_graphics_state_dirty_all
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
.. c:autofunction:: vk_dynamic_graphics_state_clear_dirty
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
.. c:autofunction:: vk_dynamic_graphics_state_any_dirty
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
|
|
Depth stencil state optimization
|
|
--------------------------------
|
|
|
|
.. c:autofunction:: vk_optimize_depth_stencil_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
|
|
Reference
|
|
---------
|
|
|
|
.. c:autostruct:: vk_graphics_pipeline_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_vertex_binding_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_vertex_attribute_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_vertex_input_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_input_assembly_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_tessellation_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_viewport_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_discard_rectangles_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_rasterization_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_fragment_shading_rate_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_sample_locations_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_multisample_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_stencil_test_face_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_depth_stencil_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_color_blend_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autostruct:: vk_render_pass_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|
|
|
|
.. c:autoenum:: mesa_vk_dynamic_graphics_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
|
|
.. c:autostruct:: vk_dynamic_graphics_state
|
|
:file: src/vulkan/runtime/vk_graphics_state.h
|
|
:members:
|