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25 * @brief Definitions for SWR_CONTEXT and DRAW_CONTEXT
26 * The SWR_CONTEXT is our global context and contains the DC ring,
29 * The DRAW_CONTEXT contains all state associated with a draw operation.
31 ******************************************************************************/
34 #include <condition_variable>
38 #include "core/utils.h"
39 #include "core/arena.h"
40 #include "core/fifo.hpp"
41 #include "core/knobs.h"
42 #include "common/simdintrin.h"
43 #include "core/threads.h"
44 #include "ringbuffer.h"
46 // x.8 fixed point precision values
47 #define FIXED_POINT_SHIFT 8
48 #define FIXED_POINT_SCALE 256
50 // x.16 fixed point precision values
51 #define FIXED_POINT16_SHIFT 16
52 #define FIXED_POINT16_SCALE 65536
59 uint32_t frontFacing
: 1;
61 uint32_t coverageMask
: (SIMD_TILE_X_DIM
* SIMD_TILE_Y_DIM
);
62 uint32_t reserved
: 32 - 1 - 1 - (SIMD_TILE_X_DIM
* SIMD_TILE_Y_DIM
);
65 uint32_t renderTargetArrayIndex
;
68 //////////////////////////////////////////////////////////////////////////
70 /////////////////////////////////////////////////////////////////////////
71 struct SWR_TRIANGLE_DESC
83 float *pUserClipBuffer
;
85 uint64_t coverageMask
[SWR_MAX_NUM_MULTISAMPLES
];
86 uint64_t innerCoverageMask
; // Conservative rasterization inner coverage: marked covered if entire pixel is covered
87 uint64_t anyCoveredSamples
;
92 struct TRIANGLE_WORK_DESC
96 float *pUserClipBuffer
;
113 float clearRTColor
[4]; // RGBA_32F
114 float clearDepth
; // [0..1]
115 uint8_t clearStencil
;
118 struct DISCARD_INVALIDATE_TILES_DESC
120 uint32_t attachmentMask
;
122 SWR_TILE_STATE newTileState
;
129 PFN_CALLBACK_FUNC pfnCallbackFunc
;
140 struct STORE_TILES_DESC
142 SWR_RENDERTARGET_ATTACHMENT attachment
;
143 SWR_TILE_STATE postStoreTileState
;
148 uint32_t threadGroupCountX
;
149 uint32_t threadGroupCountY
;
150 uint32_t threadGroupCountZ
;
153 typedef void(*PFN_WORK_FUNC
)(DRAW_CONTEXT
* pDC
, uint32_t workerId
, uint32_t macroTile
, void* pDesc
);
160 DISCARDINVALIDATETILES
,
168 PFN_WORK_FUNC pfnWork
;
172 TRIANGLE_WORK_DESC tri
;
174 DISCARD_INVALIDATE_TILES_DESC discardInvalidateTiles
;
175 STORE_TILES_DESC storeTiles
;
176 QUERY_DESC queryStats
;
185 uint32_t numIndices
; // DrawIndexed: Number of indices for draw.
186 uint32_t numVerts
; // Draw: Number of verts (triangles, lines, etc)
190 const int32_t* pIB
; // DrawIndexed: App supplied indices
191 uint32_t startVertex
; // Draw: Starting vertex in VB to render from.
194 uint32_t numInstances
; // Number of instances
195 uint32_t startInstance
; // Instance offset
196 uint32_t startPrimID
; // starting primitiveID for this draw batch
197 uint32_t startVertexID
; // starting VertexID for this draw batch (only needed for non-indexed draws)
198 SWR_FORMAT type
; // index buffer type
201 typedef void(*PFN_FE_WORK_FUNC
)(SWR_CONTEXT
* pContext
, DRAW_CONTEXT
* pDC
, uint32_t workerId
, void* pDesc
);
205 PFN_FE_WORK_FUNC pfnWork
;
211 DISCARD_INVALIDATE_TILES_DESC discardInvalidateTiles
;
212 STORE_TILES_DESC storeTiles
;
213 QUERY_DESC queryStats
;
219 float left
, right
, top
, bottom
;
224 // function signature for pipeline stages that execute after primitive assembly
225 typedef void(*PFN_PROCESS_PRIMS
)(DRAW_CONTEXT
*pDC
, PA_STATE
& pa
, uint32_t workerId
, simdvector prims
[],
226 uint32_t primMask
, simdscalari primID
);
228 OSALIGNLINE(struct) API_STATE
231 SWR_VERTEX_BUFFER_STATE vertexBuffers
[KNOB_NUM_STREAMS
];
234 SWR_INDEX_BUFFER_STATE indexBuffer
;
236 // FS - Fetch Shader State
237 PFN_FETCH_FUNC pfnFetchFunc
;
239 // VS - Vertex Shader State
240 PFN_VERTEX_FUNC pfnVertexFunc
;
242 // GS - Geometry Shader State
243 PFN_GS_FUNC pfnGsFunc
;
244 SWR_GS_STATE gsState
;
246 // CS - Compute Shader
247 PFN_CS_FUNC pfnCsFunc
;
248 uint32_t totalThreadsInGroup
;
249 uint32_t totalSpillFillSize
;
251 // FE - Frontend State
252 SWR_FRONTEND_STATE frontendState
;
254 // SOS - Streamout Shader State
255 PFN_SO_FUNC pfnSoFunc
[MAX_SO_STREAMS
];
258 SWR_STREAMOUT_STATE soState
;
259 mutable SWR_STREAMOUT_BUFFER soBuffer
[MAX_SO_STREAMS
];
261 // Tessellation State
262 PFN_HS_FUNC pfnHsFunc
;
263 PFN_DS_FUNC pfnDsFunc
;
264 SWR_TS_STATE tsState
;
266 // Number of attributes used by the frontend (vs, so, gs)
267 uint32_t feNumAttributes
;
269 PRIMITIVE_TOPOLOGY topology
;
272 // RS - Rasterizer State
273 SWR_RASTSTATE rastState
;
274 // floating point multisample offsets
275 float samplePos
[SWR_MAX_NUM_MULTISAMPLES
* 2];
279 SWR_VIEWPORT vp
[KNOB_NUM_VIEWPORTS_SCISSORS
];
280 SWR_VIEWPORT_MATRIX vpMatrix
[KNOB_NUM_VIEWPORTS_SCISSORS
];
282 BBOX scissorRects
[KNOB_NUM_VIEWPORTS_SCISSORS
];
283 BBOX scissorInFixedPoint
;
286 SWR_BACKEND_STATE backendState
;
288 // PS - Pixel shader state
289 SWR_PS_STATE psState
;
291 SWR_DEPTH_STENCIL_STATE depthStencilState
;
293 // OM - Output Merger State
294 SWR_BLEND_STATE blendState
;
295 PFN_BLEND_JIT_FUNC pfnBlendFunc
[SWR_NUM_RENDERTARGETS
];
297 // Stats are incremented when this is true.
302 uint32_t colorHottileEnable
: 8;
303 uint32_t depthHottileEnable
: 1;
304 uint32_t stencilHottileEnable
: 1;
307 PFN_QUANTIZE_DEPTH pfnQuantizeDepth
;
313 struct RenderOutputBuffers
315 uint8_t* pColor
[SWR_NUM_RENDERTARGETS
];
320 // Plane equation A/B/C coeffs used to evaluate I/J barycentric coords
321 struct BarycentricCoeffs
335 simdscalar vRecipDet
;
337 simdscalar vAOneOverW
;
338 simdscalar vBOneOverW
;
339 simdscalar vCOneOverW
;
342 // pipeline function pointer types
343 typedef void(*PFN_BACKEND_FUNC
)(DRAW_CONTEXT
*, uint32_t, uint32_t, uint32_t, SWR_TRIANGLE_DESC
&, RenderOutputBuffers
&);
344 typedef void(*PFN_OUTPUT_MERGER
)(SWR_PS_CONTEXT
&, uint8_t* (&)[SWR_NUM_RENDERTARGETS
], uint32_t, const SWR_BLEND_STATE
*,
345 const PFN_BLEND_JIT_FUNC (&)[SWR_NUM_RENDERTARGETS
], simdscalar
&, simdscalar
);
346 typedef void(*PFN_CALC_PIXEL_BARYCENTRICS
)(const BarycentricCoeffs
&, SWR_PS_CONTEXT
&);
347 typedef void(*PFN_CALC_SAMPLE_BARYCENTRICS
)(const BarycentricCoeffs
&, SWR_PS_CONTEXT
&);
348 typedef void(*PFN_CALC_CENTROID_BARYCENTRICS
)(const BarycentricCoeffs
&, SWR_PS_CONTEXT
&, const uint64_t *const, const uint32_t,
349 const simdscalar
, const simdscalar
);
353 PFN_BACKEND_FUNC pfnBackend
;
361 void* pPrivateState
; // Its required the driver sets this up for each draw.
363 // pipeline function pointers, filled in by API thread when setting up the draw
364 BACKEND_FUNCS backendFuncs
;
365 PFN_PROCESS_PRIMS pfnProcessPrims
;
367 CachingArena
* pArena
; // This should only be used by API thread.
371 // The api thread sets up a draw context that exists for the life of the draw.
372 // This draw context maintains all of the state needed for the draw operation.
375 SWR_CONTEXT
* pContext
;
378 MacroTileMgr
* pTileMgr
;
379 DispatchQueue
* pDispatch
; // Queue for thread groups. (isCompute)
382 CachingArena
* pArena
;
386 bool isCompute
; // Is this DC a compute context?
387 bool cleanupState
; // True if this is the last draw using an entry in the state ring.
388 volatile bool doneFE
; // Is FE work done for this draw?
392 volatile OSALIGNLINE(uint32_t) FeLock
;
393 volatile int64_t threadsDone
;
395 SYNC_DESC retireCallback
; // Call this func when this DC is retired.
398 static_assert((sizeof(DRAW_CONTEXT
) & 63) == 0, "Invalid size for DRAW_CONTEXT");
400 INLINE
const API_STATE
& GetApiState(const DRAW_CONTEXT
* pDC
)
402 SWR_ASSERT(pDC
!= nullptr);
403 SWR_ASSERT(pDC
->pState
!= nullptr);
405 return pDC
->pState
->state
;
408 INLINE
void* GetPrivateState(const DRAW_CONTEXT
* pDC
)
410 SWR_ASSERT(pDC
!= nullptr);
411 SWR_ASSERT(pDC
->pState
!= nullptr);
413 return pDC
->pState
->pPrivateState
;
421 // Each draw needs its own state in order to support mulitple draws in flight across multiple threads.
422 // We maintain N draw contexts configured as a ring. The size of the ring limits the maximum number
423 // of draws that can be in flight at any given time.
426 // 1. State - When an application first sets state we'll request a new draw context to use.
427 // a. If there are no available draw contexts then we'll have to wait until one becomes free.
428 // b. If one is available then set pCurDrawContext to point to it and mark it in use.
429 // c. All state calls set state on pCurDrawContext.
430 // 2. Draw - Creates submits a work item that is associated with current draw context.
431 // a. Set pPrevDrawContext = pCurDrawContext
432 // b. Set pCurDrawContext to NULL.
433 // 3. State - When an applications sets state after draw
434 // a. Same as step 1.
435 // b. State is copied from prev draw context to current.
436 RingBuffer
<DRAW_CONTEXT
> dcRing
;
438 DRAW_CONTEXT
*pCurDrawContext
; // This points to DC entry in ring for an unsubmitted draw.
439 DRAW_CONTEXT
*pPrevDrawContext
; // This points to DC entry for the previous context submitted that we can copy state from.
441 MacroTileMgr
* pMacroTileManagerArray
;
442 DispatchQueue
* pDispatchQueueArray
;
445 // When draw are very large (lots of primitives) then the API thread will break these up.
446 // These split draws all have identical state. So instead of storing the state directly
447 // in the Draw Context (DC) we instead store it in a Draw State (DS). This allows multiple DCs
448 // to reference a single entry in the DS ring.
449 RingBuffer
<DRAW_STATE
> dsRing
;
451 uint32_t curStateId
; // Current index to the next available entry in the DS ring.
453 uint32_t NumWorkerThreads
;
454 uint32_t NumFEThreads
;
455 uint32_t NumBEThreads
;
457 THREAD_POOL threadPool
; // Thread pool associated with this context
459 std::condition_variable FifosNotEmpty
;
462 DRIVER_TYPE driverType
;
464 uint32_t privateStateSize
;
466 HotTileMgr
*pHotTileMgr
;
468 // tile load/store functions, passed in at create context time
469 PFN_LOAD_TILE pfnLoadTile
;
470 PFN_STORE_TILE pfnStoreTile
;
471 PFN_CLEAR_TILE pfnClearTile
;
474 SWR_STATS stats
[KNOB_MAX_NUM_THREADS
];
476 // Scratch space for workers.
477 uint8_t* pScratch
[KNOB_MAX_NUM_THREADS
];
479 CachingAllocator cachingArenaAllocator
;
483 void WaitForDependencies(SWR_CONTEXT
*pContext
, uint64_t drawId
);
484 void WakeAllThreads(SWR_CONTEXT
*pContext
);
486 #define UPDATE_STAT(name, count) if (GetApiState(pDC).enableStats) { pContext->stats[workerId].name += count; }
487 #define SET_STAT(name, count) if (GetApiState(pDC).enableStats) { pContext->stats[workerId].name = count; }