233 lines
7.4 KiB
ReStructuredText
233 lines
7.4 KiB
ReStructuredText
ANV
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===
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Debugging
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---------
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Here are a few environment variable debug environment variables
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specific to Anv:
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:envvar:`ANV_ENABLE_PIPELINE_CACHE`
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If defined to ``0`` or ``false``, this will disable pipeline
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caching, forcing Anv to reparse and recompile any VkShaderModule
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(SPIRV) it is given.
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:envvar:`ANV_DISABLE_SECONDARY_CMD_BUFFER_CALLS`
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If defined to ``1`` or ``true``, this will prevent usage of self
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modifying command buffers to implement ``vkCmdExecuteCommands``. As
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a result of this, it will also disable ``VK_KHR_performance_query``.
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:envvar:`ANV_ALWAYS_BINDLESS`
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If defined to ``1`` or ``true``, this forces all descriptor sets to
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use the internal `Bindless model`_.
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:envvar:`ANV_QUEUE_THREAD_DISABLE`
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If defined to ``1`` or ``true``, this disables support for timeline
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semaphores.
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:envvar:`ANV_USERSPACE_RELOCS`
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If defined to ``1`` or ``true``, this forces Anv to always do
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kernel relocations in command buffers. This should only have an
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effect on hardware that doesn't support soft-pinning (Ivybridge,
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Haswell, Cherryview).
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:envvar:`ANV_PRIMITIVE_REPLICATION_MAX_VIEWS`
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Specifies up to how many view shaders can be lowered to handle
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VK_KHR_multiview. Beyond this number, multiview is implemented
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using instanced rendering. If unspecified, the value default to
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``2``.
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Experimental features
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---------------------
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:envvar:`ANV_EXPERIMENTAL_NV_MESH_SHADER`
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If defined to ``1`` or ``true``, this advertise support for
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VK_NV_mesh_shader extension for platforms that have hardware
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support for it.
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.. _`Bindless model`:
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Binding Model
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-------------
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Here is the Anv bindless binding model that was implemented for the
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descriptor indexing feature of Vulkan 1.2 :
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.. graphviz::
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digraph G {
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fontcolor="black";
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compound=true;
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subgraph cluster_1 {
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label = "Binding Table (HW)";
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bgcolor="cornflowerblue";
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node [ style=filled,shape="record",fillcolor="white",
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label="RT0" ] n0;
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node [ label="RT1" ] n1;
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node [ label="dynbuf0"] n2;
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node [ label="set0" ] n3;
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node [ label="set1" ] n4;
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node [ label="set2" ] n5;
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n0 -> n1 -> n2 -> n3 -> n4 -> n5 [style=invis];
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}
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subgraph cluster_2 {
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label = "Descriptor Set 0";
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bgcolor="burlywood3";
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fixedsize = true;
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node [ style=filled,shape="record",fillcolor="white", fixedsize = true, width=4,
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label="binding 0 - STORAGE_IMAGE\n anv_storage_image_descriptor" ] n8;
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node [ label="binding 1 - COMBINED_IMAGE_SAMPLER\n anv_sampled_image_descriptor" ] n9;
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node [ label="binding 2 - UNIFORM_BUFFER\n anv_address_range_descriptor" ] n10;
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node [ label="binding 3 - UNIFORM_TEXEL_BUFFER\n anv_storage_image_descriptor" ] n11;
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n8 -> n9 -> n10 -> n11 [style=invis];
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}
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subgraph cluster_5 {
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label = "Vulkan Objects"
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fontcolor="black";
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bgcolor="darkolivegreen4";
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subgraph cluster_6 {
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label = "VkImageView";
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bgcolor=darkolivegreen3;
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node [ style=filled,shape="box",fillcolor="white", fixedsize = true, width=2,
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label="surface_state" ] n12;
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}
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subgraph cluster_7 {
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label = "VkSampler";
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bgcolor=darkolivegreen3;
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node [ style=filled,shape="box",fillcolor="white", fixedsize = true, width=2,
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label="sample_state" ] n13;
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}
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subgraph cluster_8 {
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label = "VkImageView";
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bgcolor="darkolivegreen3";
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node [ style=filled,shape="box",fillcolor="white", fixedsize = true, width=2,
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label="surface_state" ] n14;
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}
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subgraph cluster_9 {
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label = "VkBuffer";
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bgcolor=darkolivegreen3;
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node [ style=filled,shape="box",fillcolor="white", fixedsize = true, width=2,
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label="address" ] n15;
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}
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subgraph cluster_10 {
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label = "VkBufferView";
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bgcolor=darkolivegreen3;
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node [ style=filled,shape="box",fillcolor="white", fixedsize = true, width=2,
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label="surface_state" ] n16;
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}
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n12 -> n13 -> n14 -> n15 -> n16 [style=invis];
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}
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subgraph cluster_11 {
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subgraph cluster_12 {
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label = "CommandBuffer state stream";
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bgcolor="gold3";
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node [ style=filled,shape="box",fillcolor="white", fixedsize = true, width=2,
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label="surface_state" ] n17;
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node [ label="surface_state" ] n18;
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node [ label="surface_state" ] n19;
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n17 -> n18 -> n19 [style=invis];
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}
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}
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n3 -> n8 [lhead=cluster_2];
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n8 -> n12;
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n9 -> n13;
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n9 -> n14;
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n10 -> n15;
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n11 -> n16;
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n0 -> n17;
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n1 -> n18;
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n2 -> n19;
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}
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The HW binding table is generated when the draw or dispatch commands
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are emitted. Here are the types of entries one can find in the binding
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table :
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- The currently bound descriptor sets, one entry per descriptor set
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(our limit is 8).
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- For dynamic buffers, one entry per dynamic buffer.
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- For draw commands, render target entries if needed.
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The entries of the HW binding table for descriptor sets are
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RENDER_SURFACE_STATE similar to what you would have for a normal
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uniform buffer. The shader will emit reads this buffer first to get
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the information it needs to access a surface/sampler/etc... and then
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emits the appropriate message using the information gathered from the
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descriptor set buffer.
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Each binding type entry gets an associated structure in memory
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(``anv_storage_image_descriptor``, ``anv_sampled_image_descriptor``,
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``anv_address_range_descriptor``, ``anv_storage_image_descriptor``).
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This is the information read by the shader.
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.. _`Descriptor Set Memory Layout`:
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Descriptor Set Memory Layout
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----------------------------
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Here is a representation of how the descriptor set bindings, with each
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elements in each binding is mapped to a the descriptor set memory :
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.. graphviz::
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digraph structs {
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node [shape=record];
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rankdir=LR;
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struct1 [label="Descriptor Set | \
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<b0> binding 0\n STORAGE_IMAGE \n (array_length=3) | \
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<b1> binding 1\n COMBINED_IMAGE_SAMPLER \n (array_length=2) | \
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<b2> binding 2\n UNIFORM_BUFFER \n (array_length=1) | \
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<b3> binding 3\n UNIFORM_TEXEL_BUFFER \n (array_length=1)"];
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struct2 [label="Descriptor Set Memory | \
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<b0e0> anv_storage_image_descriptor|\
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<b0e1> anv_storage_image_descriptor|\
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<b0e2> anv_storage_image_descriptor|\
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<b1e0> anv_sampled_image_descriptor|\
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<b1e1> anv_sampled_image_descriptor|\
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<b2e0> anv_address_range_descriptor|\
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<b3e0> anv_storage_image_descriptor"];
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struct1:b0 -> struct2:b0e0;
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struct1:b0 -> struct2:b0e1;
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struct1:b0 -> struct2:b0e2;
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struct1:b1 -> struct2:b1e0;
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struct1:b1 -> struct2:b1e1;
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struct1:b2 -> struct2:b2e0;
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struct1:b3 -> struct2:b3e0;
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}
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Each Binding in the descriptor set is allocated an array of
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``anv_*_descriptor`` data structure. The type of ``anv_*_descriptor``
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used for a binding is selected based on the ``VkDescriptorType`` of
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the bindings.
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The value of ``anv_descriptor_set_binding_layout::descriptor_offset``
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is a byte offset from the descriptor set memory to the associated
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binding. ``anv_descriptor_set_binding_layout::array_size`` is the
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number of ``anv_*_descriptor`` elements in the descriptor set memory
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from that offset for the binding.
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