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Tile-based approaches with compute\nare used for screen space ambient occlusion, de-noising, and other\npost-processing algorithms.",{"type":10,"tag":11,"props":29,"children":30},{},[31],{"type":15,"value":32},"Most mobile GPUs utilize Tile-Based Deferred Rendering (TBDR) combined\nwith high-bandwidth \"tile memory\" to optimize for power and performance.\nConversely, most desktop GPUs use Immediate-Mode (IM) rendering without\ntile memory.",{"type":10,"tag":11,"props":34,"children":35},{},[36],{"type":15,"value":37},"A TBDR architecture divides the color and depth buffer attachments into a regular\ngrid of smaller regions called \"tiles\".\nWhen the commands for a renderpass instance are submitted for execution, the GPU\nmay perform a tile visibility pass with the resulting per-tile visibility information\ndeferred for use in a subsequent series of tile rendering passes — one rendering\npass for each tile in the framebuffer. Since the tile rendering passes are\nindependent, some implementations may render multiple tiles in parallel. After\neach tile is rendered, the resulting tile is copied to the framebuffer.\nThe tile rendering passes render into a specialized high-bandwidth\non-die memory called \"tile memory\".\nGPU access to tile memory is dramatically more efficient than the device memory\nthat backs the framebuffer attachments.",{"type":10,"tag":11,"props":39,"children":40},{},[41],{"type":15,"value":42},"The TBDR architecture creates an opportunity to express operations that execute\nper-tile after each tile rendering pass completes, and while the framebuffer\ncontent is still cached in highly efficient tile memory.\nWhile the primary focus is on executing compute workloads that operate on\ntiles, there are also use-cases for executing draw commands after the\ntile rendering pass completes.\nSince these dispatch and/or draw commands execute per-tile, they can only\naccess those pixel locations within the boundaries of the current tile.\nThis proposal describes a Vulkan API extension for the above\ntile-based features, collectively referred to as \"tile shading\".",{"type":10,"tag":17,"props":44,"children":46},{"id":45},"_solution_space",[47],{"type":15,"value":48},"Solution Space",{"type":10,"tag":11,"props":50,"children":51},{},[52],{"type":15,"value":53},"For the common use-cases, the tile shading pass will consume the attachment\npixels that were rendered in a previous pass, or will generate outputs that\nare to be consumed in a subsequent pass.\nFor this reason, tile shading fits naturally as some variant of Vulkan render passes.",{"type":10,"tag":11,"props":55,"children":56},{},[57],{"type":15,"value":58},"The options considered for addressing this issue:\n* Add tile shading functionality as a set of individual API extensions corresponding to individual features\n* Create a single, cohesive extension for the tile shading, that brings Vulkan to parity with other APIs.",{"type":10,"tag":11,"props":60,"children":61},{},[62],{"type":15,"value":63},"Option 1 has an advantage in that each extension is smaller and has reduced API surface area. It also\nincreases the likelihood that some extensions would be supported by multiple GPU vendors.\nThis piecemeal approach is likely to result in fractured support in the ecosystem, and makes it difficult\nfor developers to rely on a single cohesive set of functionality.",{"type":10,"tag":11,"props":65,"children":66},{},[67],{"type":15,"value":68},"Option 2 has the advantage of collecting a set of related features into a single extension, but\nis likely to align with the capabilities of a single TBDR architecture, in this case Adreno ™ GPUs.",{"type":10,"tag":11,"props":70,"children":71},{},[72],{"type":15,"value":73},"This proposal focuses on option 2, and specifically on evangelizing the tile shading features\nthat are available on Adreno ™ GPUs. Some features in this vendor extension may\nbe incorporated into a future cross-vendor tile shading extension while other features may\nbe unique to Adreno ™ and never supported by other vendors.",{"type":10,"tag":17,"props":75,"children":77},{"id":76},"_proposal",[78],{"type":15,"value":79},"Proposal",{"type":10,"tag":11,"props":81,"children":82},{},[83],{"type":15,"value":84},"This proposal builds on two existing extensions:",{"type":10,"tag":86,"props":87,"children":88},"ul",{},[89,104],{"type":10,"tag":90,"props":91,"children":92},"li",{},[93,102],{"type":10,"tag":94,"props":95,"children":99},"a",{"href":96,"rel":97},"https://docs.vulkan.org/spec/latest/appendices/extensions.html#VK_QCOM_tile_properties",[98],"nofollow",[100],{"type":15,"value":101},"VK_QCOM_tile_properties",{"type":15,"value":103}," which exposes tile locations\nand dimensions to the application.",{"type":10,"tag":90,"props":105,"children":106},{},[107,114],{"type":10,"tag":94,"props":108,"children":111},{"href":109,"rel":110},"https://docs.vulkan.org/spec/latest/appendices/extensions.html#VK_KHR_dynamic_rendering_local_read",[98],[112],{"type":15,"value":113},"VK_KHR_dynamic_rendering_local_read",{"type":15,"value":115},"\nwhich extends dynamic rendering to support multiple passes with input attachments.",{"type":10,"tag":11,"props":117,"children":118},{},[119,121,127],{"type":15,"value":120},"Implementations exposing this extension must support ",{"type":10,"tag":122,"props":123,"children":125},"code",{"className":124},[],[126],{"type":15,"value":101},{"type":15,"value":128}," because the ability\nto query how the implementation has sub-divided the attachments into tiles is so fundamental to tile\nshading. 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The tile’s\nextent is exposed in the shader via ",{"type":10,"tag":94,"props":207,"children":208},{"href":157},[209],{"type":15,"value":160},{"type":15,"value":211},"\nand in the API via ",{"type":10,"tag":122,"props":213,"children":215},{"className":214},[],[216],{"type":15,"value":101},{"type":15,"value":218},".",{"type":10,"tag":90,"props":220,"children":221},{},[222,224,229,231,235,237,242],{"type":15,"value":223},"Compute shaders have all the same functionality described above for fragment shaders.\nThis includes load/store/sample of ",{"type":10,"tag":94,"props":225,"children":226},{"href":144},[227],{"type":15,"value":228},"tile image attachments",{"type":15,"value":230},",\n",{"type":10,"tag":94,"props":232,"children":233},{"href":157},[234],{"type":15,"value":160},{"type":15,"value":236},", and ",{"type":10,"tag":94,"props":238,"children":239},{"href":168},[240],{"type":15,"value":241},"tile 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Note that for aprons to be useful, one\nof the below tileShading*Attachments features needs to be supported.",{"type":10,"tag":90,"props":4201,"children":4202},{},[4203,4209],{"type":10,"tag":122,"props":4204,"children":4206},{"className":4205},[],[4207],{"type":15,"value":4208},"tileShadingAnisotropicApron",{"type":15,"value":4210}," indicates the implementation supports\naprons with a width and height that are different values.",{"type":10,"tag":90,"props":4212,"children":4213},{},[4214,4219],{"type":10,"tag":122,"props":4215,"children":4217},{"className":4216},[],[4218],{"type":15,"value":1022},{"type":15,"value":4220}," indicates the implementation support atomic\noperations with tile attachments.",{"type":10,"tag":90,"props":4222,"children":4223},{},[4224,4230],{"type":10,"tag":122,"props":4225,"children":4227},{"className":4226},[],[4228],{"type":15,"value":4229},"tileShadingImageProcessing",{"type":15,"value":4231}," indicates that the implementation\nsupports image processing instructions with tile attachments.",{"type":10,"tag":11,"props":4233,"children":4234},{},[4235],{"type":15,"value":4236},"The following properties structure is proposed.",{"type":10,"tag":300,"props":4238,"children":4240},{"className":302,"code":4239,"language":304,"meta":305,"style":305},"typedef struct VkPhysicalDeviceTileShadingPropertiesQCOM {\n    VkStructureType    sType;\n    void*              pNext;\n    uint32_t           maxApronSize;\n    VkBool32           preferNonCoherent;\n    VkExtent2D         tileGranularity;\n    VkExtent2D         maxTileShadingRate;\n} VkPhysicalDeviceTileShadingPropertiesQCOM;\n",[4241],{"type":10,"tag":122,"props":4242,"children":4243},{"__ignoreMap":305},[4244,4260,4267,4278,4291,4299,4307,4315],{"type":10,"tag":311,"props":4245,"children":4246},{"class":313,"line":314},[4247,4251,4255],{"type":10,"tag":311,"props":4248,"children":4249},{"style":318},[4250],{"type":15,"value":321},{"type":10,"tag":311,"props":4252,"children":4253},{"style":318},[4254],{"type":15,"value":462},{"type":10,"tag":311,"props":4256,"children":4257},{"style":329},[4258],{"type":15,"value":4259}," VkPhysicalDeviceTileShadingPropertiesQCOM {\n",{"type":10,"tag":311,"props":4261,"children":4262},{"class":313,"line":335},[4263],{"type":10,"tag":311,"props":4264,"children":4265},{"style":329},[4266],{"type":15,"value":625},{"type":10,"tag":311,"props":4268,"children":4269},{"class":313,"line":364},[4270,4274],{"type":10,"tag":311,"props":4271,"children":4272},{"style":318},[4273],{"type":15,"value":3794},{"type":10,"tag":311,"props":4275,"children":4276},{"style":329},[4277],{"type":15,"value":3799},{"type":10,"tag":311,"props":4279,"children":4280},{"class":313,"line":390},[4281,4286],{"type":10,"tag":311,"props":4282,"children":4283},{"style":318},[4284],{"type":15,"value":4285},"    uint32_t",{"type":10,"tag":311,"props":4287,"children":4288},{"style":329},[4289],{"type":15,"value":4290},"           maxApronSize;\n",{"type":10,"tag":311,"props":4292,"children":4293},{"class":313,"line":412},[4294],{"type":10,"tag":311,"props":4295,"children":4296},{"style":329},[4297],{"type":15,"value":4298},"    VkBool32           preferNonCoherent;\n",{"type":10,"tag":311,"props":4300,"children":4301},{"class":313,"line":421},[4302],{"type":10,"tag":311,"props":4303,"children":4304},{"style":329},[4305],{"type":15,"value":4306},"    VkExtent2D         tileGranularity;\n",{"type":10,"tag":311,"props":4308,"children":4309},{"class":313,"line":431},[4310],{"type":10,"tag":311,"props":4311,"children":4312},{"style":329},[4313],{"type":15,"value":4314},"    VkExtent2D         maxTileShadingRate;\n",{"type":10,"tag":311,"props":4316,"children":4317},{"class":313,"line":444},[4318],{"type":10,"tag":311,"props":4319,"children":4320},{"style":329},[4321],{"type":15,"value":4322},"} VkPhysicalDeviceTileShadingPropertiesQCOM;\n",{"type":10,"tag":86,"props":4324,"children":4325},{},[4326,4338,4358,4370],{"type":10,"tag":90,"props":4327,"children":4328},{},[4329,4330,4336],{"type":15,"value":2003},{"type":10,"tag":122,"props":4331,"children":4333},{"className":4332},[],[4334],{"type":15,"value":4335},"maxApronSize",{"type":15,"value":4337}," property defines the maximum tile apron size allowed.",{"type":10,"tag":90,"props":4339,"children":4340},{},[4341,4342,4348,4350,4356],{"type":15,"value":2003},{"type":10,"tag":122,"props":4343,"children":4345},{"className":4344},[],[4346],{"type":15,"value":4347},"preferNonCoherent",{"type":15,"value":4349}," property indicates whether the implementation prefers\nSPIR-V ",{"type":10,"tag":122,"props":4351,"children":4353},{"className":4352},[],[4354],{"type":15,"value":4355},"NonCoherentTileAttachment",{"type":15,"value":4357}," execution mode.",{"type":10,"tag":90,"props":4359,"children":4360},{},[4361,4362,4368],{"type":15,"value":2003},{"type":10,"tag":122,"props":4363,"children":4365},{"className":4364},[],[4366],{"type":15,"value":4367},"tileGranularity",{"type":15,"value":4369}," property provides a guarantee on the granularity of each tile.\nEach tile will have dimensions that are a multiple of this granularity in width and height.",{"type":10,"tag":90,"props":4371,"children":4372},{},[4373,4374,4379,4381,4387],{"type":15,"value":2003},{"type":10,"tag":122,"props":4375,"children":4377},{"className":4376},[],[4378],{"type":15,"value":1564},{"type":15,"value":4380}," property defines the maximum value that the ",{"type":10,"tag":122,"props":4382,"children":4384},{"className":4383},[],[4385],{"type":15,"value":4386},"TileShadingRateQCOM",{"type":15,"value":4388},"\nspecified in the shader can be, and must be a power of 2.",{"type":10,"tag":17,"props":4390,"children":4392},{"id":4391},"_issues",[4393],{"type":15,"value":4394},"Issues",{"type":10,"tag":249,"props":4396,"children":4398},{"id":4397},"_are_all_attachment_typescolor_depthstencil_input_resolve_accessible_via_tile_attachment_loadstore_operations",[4399],{"type":15,"value":4400},"Are all attachment types(color, depth/stencil, input, resolve) accessible via tile attachment load/store operations.",{"type":10,"tag":11,"props":4402,"children":4403},{},[4404],{"type":15,"value":4405},"PROPOSED:  No, we propose the following restrictions for specific attachment types and shader stages:",{"type":10,"tag":86,"props":4407,"children":4408},{},[4409,4414],{"type":10,"tag":90,"props":4410,"children":4411},{},[4412],{"type":15,"value":4413},"Compute and fragment shaders must not store to depth/stencil attachments, resolve attachments,\nnor input attachments.",{"type":10,"tag":90,"props":4415,"children":4416},{},[4417],{"type":15,"value":4418},"Fragment shaders must not store to color attachments.",{"type":10,"tag":11,"props":4420,"children":4421},{},[4422],{"type":15,"value":4423},"There are no known use-cases for tile stores to input attachments, and it seemed\nunexpected that an \"input attachment\" would be modified. Shader writes to\ndepth/stencil attachments is unexpected and may require disablement of\nimplementation-specific depth acceleration features. Resolve attachments are\nunlikely to be backed by tile memory  Within a fragment shader, stores to the\ncolor attachment do not seem useful and could be difficult to synchronize with\nfragment output writes. For those reasons, the above cases are disallowed\nin this extension.",{"type":10,"tag":249,"props":4425,"children":4427},{"id":4426},"_should_draw_commands_be_allowed_when_per_tile_execution_mode_is_enabled",[4428],{"type":15,"value":4429},"Should draw commands be allowed when per-tile execution mode is enabled?",{"type":10,"tag":11,"props":4431,"children":4432},{},[4433],{"type":15,"value":4434},"PROPOSED: Yes, this is allowed, because it can be useful for certain use-cases.",{"type":10,"tag":11,"props":4436,"children":4437},{},[4438],{"type":15,"value":4439},"Without this extension, a TBDR GPU can \"distribute\" the draw call across the tiles.\nAs the GPU processes each tile, if a draw command includes primitives that do not\ncover the current tile, then the implementation may \"skip\" such primitives for\nthat tile.\nIf a draw command contains no primitives that cover the current tile, the\ndraw call may be entirely skipped for that tile.\nThis is important feature for maximizing TBDR rendering efficiency.",{"type":10,"tag":11,"props":4441,"children":4442},{},[4443,4445,4450],{"type":15,"value":4444},"With this extension, per-tile draws are introduced. A per-tile draw guarantees\nthe draw will be executed for each tile, effectively bypassing the above\nmechanisms.\nThe intended use-case for per-tile draws is for GPU-driven rendering.\nIn this use-case, a per-tile dispatch invokes a per-tile compute shader that writes\ndata to an indirect buffer, followed by a per-tile vkCmdDrawIndirect* that\nconsumes the same buffer. The application should ensure that each\nper-tile draw contains only primitives that cover the current tile. This is also\nthe motivation for adding ",{"type":10,"tag":122,"props":4446,"children":4448},{"className":4447},[],[4449],{"type":15,"value":3639},{"type":15,"value":4451}," as a\nframebuffer-space pipeline stage, enabling BY_REGION dependencies for the\nDRAW_INDIRECT stage.",{"type":10,"tag":11,"props":4453,"children":4454},{},[4455],{"type":15,"value":4456},"Other than such GPU-driven use-cases, the use of per-tile draws is discouraged.",{"type":10,"tag":249,"props":4458,"children":4460},{"id":4459},"_should_texture_sampling_be_supported_on_tile_attachments",[4461],{"type":15,"value":4462},"Should texture sampling be supported on tile attachments?",{"type":10,"tag":11,"props":4464,"children":4465},{},[4466,4468,4474],{"type":15,"value":4467},"PROPOSED: Yes, this has been included in the current proposal, but\nguarded by feature bit ",{"type":10,"tag":122,"props":4469,"children":4471},{"className":4470},[],[4472],{"type":15,"value":4473},"tileShadingSampledAttachments",{"type":15,"value":218},{"type":10,"tag":86,"props":4476,"children":4477},{},[4478,4513,4550,4555],{"type":10,"tag":90,"props":4479,"children":4480},{},[4481,4483,4489,4491,4497,4499,4504,4506,4511],{"type":15,"value":4482},"Tile attachment images used to construct ",{"type":10,"tag":122,"props":4484,"children":4486},{"className":4485},[],[4487],{"type":15,"value":4488},"OpSampledImage",{"type":15,"value":4490}," must\nhave been declared with the ",{"type":10,"tag":122,"props":4492,"children":4494},{"className":4493},[],[4495],{"type":15,"value":4496},"tileSampledImageQCOM",{"type":15,"value":4498}," storage qualifier,\nand will have an associated ",{"type":10,"tag":122,"props":4500,"children":4502},{"className":4501},[],[4503],{"type":15,"value":979},{"type":15,"value":4505}," or\n",{"type":10,"tag":122,"props":4507,"children":4509},{"className":4508},[],[4510],{"type":15,"value":1865},{"type":15,"value":4512}," descriptor.",{"type":10,"tag":90,"props":4514,"children":4515},{},[4516,4518,4523,4525,4530,4531,4536,4537,4542,4543,4548],{"type":15,"value":4517},"The resulting ",{"type":10,"tag":122,"props":4519,"children":4521},{"className":4520},[],[4522],{"type":15,"value":4488},{"type":15,"value":4524}," variable can be used with all the texture\n",{"type":10,"tag":122,"props":4526,"children":4528},{"className":4527},[],[4529],{"type":15,"value":4065},{"type":15,"value":1131},{"type":10,"tag":122,"props":4532,"children":4534},{"className":4533},[],[4535],{"type":15,"value":4072},{"type":15,"value":1131},{"type":10,"tag":122,"props":4538,"children":4540},{"className":4539},[],[4541],{"type":15,"value":4079},{"type":15,"value":236},{"type":10,"tag":122,"props":4544,"children":4546},{"className":4545},[],[4547],{"type":15,"value":4086},{"type":15,"value":4549},"\ninstructions.",{"type":10,"tag":90,"props":4551,"children":4552},{},[4553],{"type":15,"value":4554},"Texture coordinates for are relative to the attachment dimensions, rather than\nrelative to the tile dimensions.",{"type":10,"tag":90,"props":4556,"children":4557},{},[4558],{"type":15,"value":4559},"When sampling from a sampled tile attachment, if the texture coordinates\nare near a tile edge, or fully outside the tile, the texels participating in\ntexture filter may extend beyond the boundaries of the tile, resulting in reads\nof invalid texel locations, resulting in undefined values returned to the\nshader. The implementation is not required to clamp the coordinates to a valid\nrange. Applications will need to guarantee that the filter does not result in\nreading locations outside the tile+apron boundary.",{"type":10,"tag":249,"props":4561,"children":4563},{"id":4562},"_does_this_extension_offer_any_guarantees_for_the_granularity_of_the_tile_dimensions",[4564],{"type":15,"value":4565},"Does this extension offer any guarantees for the granularity of the tile dimensions?",{"type":10,"tag":11,"props":4567,"children":4568},{},[4569],{"type":15,"value":4570},"PROPOSED: Yes, the granularity is guaranteed.",{"type":10,"tag":11,"props":4572,"children":4573},{},[4574,4579],{"type":10,"tag":94,"props":4575,"children":4577},{"href":96,"rel":4576},[98],[4578],{"type":15,"value":101},{"type":15,"value":4580}," reports\ntile dimensions but does not provide any guarantees on the granularity of the tile\ndimension, making it difficult to author compute shaders that operate on a workgroup\nsize of known dimensions.",{"type":10,"tag":11,"props":4582,"children":4583},{},[4584,4586,4591],{"type":15,"value":4585},"An extension property ",{"type":10,"tag":122,"props":4587,"children":4589},{"className":4588},[],[4590],{"type":15,"value":4367},{"type":15,"value":4592}," is exposed to provide this.",{"type":10,"tag":249,"props":4594,"children":4596},{"id":4595},"_should_we_support_atomic_operations_on_tile_attachments",[4597],{"type":15,"value":4598},"Should we support atomic operations on tile attachments?",{"type":10,"tag":11,"props":4600,"children":4601},{},[4602],{"type":15,"value":4603},"PROPOSED:  Yes, the atomic operations on tile attachments are supported but\nthe functionality is currently guarded by a feature bit.",{"type":10,"tag":249,"props":4605,"children":4607},{"id":4606},"_does_this_extension_support_multiview_rendering",[4608],{"type":15,"value":4609},"Does this extension support multiview rendering?",{"type":10,"tag":11,"props":4611,"children":4612},{},[4613],{"type":15,"value":4614},"PROPOSED: Yes, this is supported.",{"type":10,"tag":11,"props":4616,"children":4617},{},[4618,4620,4625],{"type":15,"value":4619},"Without this extension, implementations may implement multiview\nrendering as single-pass rendering to a multi-layered attachment, or multi-pass\nrendering where each pass renders one view/layer. With this extension,\nthe former would use multi-layered tiles and the latter would use\nsingle-layered tiles. The number of layers in the tile would affect\nmost application use-cases for tile shading. ",{"type":10,"tag":122,"props":4621,"children":4623},{"className":4622},[],[4624],{"type":15,"value":101},{"type":15,"value":4626}," exposes\nthe number of layers in the tile, allowing the application to handle either\nimplementation style.",{"type":10,"tag":249,"props":4628,"children":4630},{"id":4629},"_does_this_extension_support_attachments_with_a_layer_count_greater_than_1",[4631],{"type":15,"value":4632},"Does this extension support attachments with a layer count greater than 1?",{"type":10,"tag":11,"props":4634,"children":4635},{},[4636,4638,4643],{"type":15,"value":4637},"PROPOSED: Yes, this is supported. The the existing ",{"type":10,"tag":122,"props":4639,"children":4641},{"className":4640},[],[4642],{"type":15,"value":101},{"type":15,"value":4644},"\nextension exposes support for multi-layered tiles.",{"type":10,"tag":249,"props":4646,"children":4648},{"id":4647},"_are_store_operations_allowed_for_apron_pixels",[4649],{"type":15,"value":4650},"Are store operations allowed for apron pixels?",{"type":10,"tag":11,"props":4652,"children":4653},{},[4654],{"type":15,"value":4655},"PROPOSED: No, this is not allowed.",{"type":10,"tag":11,"props":4657,"children":4658},{},[4659],{"type":15,"value":4660},"There are no known use-cases, for stores to the apron pixels\nand supporting this may come at a performance cost on some\nTBDRs.",{"type":10,"tag":249,"props":4662,"children":4664},{"id":4663},"_is_functionality_and_performance_expected_to_be_similar_for_both_render_pass_objects_and_dynamic_render_passes",[4665],{"type":15,"value":4666},"Is functionality and performance expected to be similar for both render pass objects and dynamic render passes?",{"type":10,"tag":11,"props":4668,"children":4669},{},[4670,4672,4677],{"type":15,"value":4671},"PROPOSED: Yes, since this extension builds upon\n",{"type":10,"tag":94,"props":4673,"children":4675},{"href":109,"rel":4674},[98],[4676],{"type":15,"value":113},{"type":15,"value":4678},",\nthe functionality and performance is expected to be equivalent.",{"type":10,"tag":11,"props":4680,"children":4681},{},[4682],{"type":15,"value":4683},"Earlier versions of this extension that were not based on\nVK_KHR_dynamic_rendering_local_read resulted in far less functionality\nfor dynamic render passes.",{"type":10,"tag":249,"props":4685,"children":4687},{"id":4686},"_does_this_extension_change_the_behavior_of_render_pass_loadop_or_storeop",[4688],{"type":15,"value":4689},"Does this extension change the behavior of render pass LoadOp or StoreOp?",{"type":10,"tag":11,"props":4691,"children":4692},{},[4693],{"type":15,"value":4694},"RESOLVED: No, there is no change to the behavior.",{"type":10,"tag":249,"props":4696,"children":4698},{"id":4697},"_can_tile_attachment_loadstore_operations_be_used_without_enabling_per_tile_execution",[4699],{"type":15,"value":4700},"Can tile attachment load/store operations be used without enabling per-tile execution?",{"type":10,"tag":11,"props":4702,"children":4703},{},[4704,4706,4710],{"type":15,"value":4705},"RESOLVED: Yes, if a render pass enables tile shading but not the\n",{"type":10,"tag":94,"props":4707,"children":4708},{"href":181},[4709],{"type":15,"value":184},{"type":15,"value":4711},", then\nfragment shader invocations can load pixel values from tile attachment\nvariables.",{"type":10,"tag":11,"props":4713,"children":4714},{},[4715],{"type":15,"value":4716},"This includes loading the pixel value of the fragment coordinate\n(aka \"framebuffer fetch\") as well as the ability to load pixel values\nof other fragments within the tile and/or the apron region.",{"type":10,"tag":249,"props":4718,"children":4720},{"id":4719},"_should_this_extension_include_the_ability_for_fragment_or_compute_shader_to_reinterpret_the_format_of_tile_attachment_pixels",[4721],{"type":15,"value":4722},"Should this extension include the ability for fragment or compute shader to reinterpret the format of tile attachment pixels?",{"type":10,"tag":11,"props":4724,"children":4725},{},[4726],{"type":15,"value":4727},"RESOLVED: No, while such a feature is desirable for many TBDR GPUs and is related to\nto this extension, but was considered beyond the scope of this extension.",{"type":10,"tag":11,"props":4729,"children":4730},{},[4731,4733,4739],{"type":15,"value":4732},"Use-cases such as deferred shading and deferred lighting are often implemented with multiple\ncolor attachments, representing the framebuffer pixels in different formats or layouts.\nThe OpenGL extension ",{"type":10,"tag":122,"props":4734,"children":4736},{"className":4735},[],[4737],{"type":15,"value":4738},"GL_EXT_shader_pixel_local_storage",{"type":15,"value":4740}," supports such reinterpretation,\nand other tile shading APIs incorporate something similar. These mechanisms enable\nthe same block of tile memory to be interpreted as multiple layouts or formats.",{"type":10,"tag":11,"props":4742,"children":4743},{},[4744],{"type":15,"value":4745},"Such reinterpretation of framebuffer pixels can be useful even if tile shading is not\nused. Therefore, it may be best handled as a completely separate extension.",{"type":10,"tag":249,"props":4747,"children":4749},{"id":4748},"_should_this_extension_include_an_area_based_dispatch",[4750],{"type":15,"value":4751},"Should this extension include an area-based dispatch?",{"type":10,"tag":11,"props":4753,"children":4754},{},[4755],{"type":15,"value":4756},"RESOLVED: Yes, one some Adreno ™ GPUs and for some use-cases, the tile-sized\ndispatch can improve GPU efficiency and has been incorporated into this extension.",{"type":10,"tag":11,"props":4758,"children":4759},{},[4760,4765],{"type":10,"tag":122,"props":4761,"children":4763},{"className":4762},[],[4764],{"type":15,"value":4180},{"type":15,"value":4766}," provides a \"tile-sized dispatch\" where\nthe number of compute shader invocations is a function of the tile dimensions,\nwhere the GPU can construct workgroups that are aligned to implementation specific\nmicro-tiles and assign those workgroups to the shader core that is able to\nmost optimally perform load/store operations for the micro tile’s pixels.",{"type":10,"tag":249,"props":4768,"children":4770},{"id":4769},"_do_we_need_a_new_vk_pipeline_create_bit_to_specify_if_per_tile_execution_mode_will_be_enabled",[4771],{"type":15,"value":4772},"Do we need a new VK_PIPELINE_CREATE bit to specify if per-tile execution mode will be enabled?",{"type":10,"tag":11,"props":4774,"children":4775},{},[4776,4778,4782,4784,4789],{"type":15,"value":4777},"RESOLVED: No. In this proposal, a created graphics pipeline can be used in a render\npass regardless whether the render pass enables tile shading, and regardless whether\n",{"type":10,"tag":94,"props":4779,"children":4780},{"href":181},[4781],{"type":15,"value":592},{"type":15,"value":4783}," is enabled. Similarly,\na created compute pipelines can now be used inside or outside a render pass. We decided\nnot to require these usage flags during pipeline creation because we think it would be a burden\nto developers and because we do not anticipate implementations will require this information.\nWe do specify that the new shader built-ins (e.g., TileDimensionQCOM, TileOffsetQCOM, etc.) contain\nthe value ",{"type":10,"tag":122,"props":4785,"children":4787},{"className":4786},[],[4788],{"type":15,"value":1599},{"type":15,"value":4790}," if the shader is invoked when per-tile execution mode is disabled.",{"type":10,"tag":249,"props":4792,"children":4794},{"id":4793},"_should_vkcomputepipelinecreateinfo_be_extended_with_renderpasssubpass_information",[4795],{"type":15,"value":4796},"Should VkComputePipelineCreateInfo be extended with renderpass/subpass information?",{"type":10,"tag":11,"props":4798,"children":4799},{},[4800],{"type":15,"value":4801},"RESOLVED: No. Similar to above, we believe that limiting\ncompute pipelines to a single renderpass/subpass would be a burden to developers\nand we do not anticipate that implementations need this information.",{"type":10,"tag":249,"props":4803,"children":4805},{"id":4804},"_how_does_this_extension_differ_from_vk_ext_shader_tile_image",[4806,4808,4815],{"type":15,"value":4807},"How does this extension differ from ",{"type":10,"tag":94,"props":4809,"children":4812},{"href":4810,"rel":4811},"https://docs.vulkan.org/spec/latest/appendices/extensions.html#VK_EXT_shader_tile_image",[98],[4813],{"type":15,"value":4814},"VK_EXT_shader_tile_image",{"type":15,"value":4816},"?",{"type":10,"tag":11,"props":4818,"children":4819},{},[4820,4822,4827],{"type":15,"value":4821},"RESOLVED: The functionality of this extension is a superset of ",{"type":10,"tag":122,"props":4823,"children":4825},{"className":4824},[],[4826],{"type":15,"value":4814},{"type":15,"value":218},{"type":10,"tag":11,"props":4829,"children":4830},{},[4831],{"type":15,"value":4832},"VK_EXT_shader_tile_image is limited to bringing the functionality of\nGL_EXT_shader_framebuffer_fetch to Vulkan dynamic render passes. 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