src/gallium/drivers/swr/rasterizer/core/context.h

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  22 *
  23 * @file context.h
  24 *
  25 * @brief Definitions for SWR_CONTEXT and DRAW_CONTEXT
  26 *        The SWR_CONTEXT is our global context and contains the DC ring,
  27 *        thread state, etc.
  28 *
  29 *        The DRAW_CONTEXT contains all state associated with a draw operation.
  30 *
  31 ******************************************************************************/
  32 #pragma once
  33
  34 #include <condition_variable>
  35 #include <algorithm>
  36
  37 #include "core/api.h"
  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"
  45
  46 // x.8 fixed point precision values
  47 #define FIXED_POINT_SHIFT 8
  48 #define FIXED_POINT_SCALE 256
  49
  50 // x.16 fixed point precision values
  51 #define FIXED_POINT16_SHIFT 16
  52 #define FIXED_POINT16_SCALE 65536
  53
  54 struct SWR_CONTEXT;
  55 struct DRAW_CONTEXT;
  56
  57 struct TRI_FLAGS
  58 {
  59     uint32_t frontFacing : 1;
  60     uint32_t yMajor : 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);
  63     float pointSize;
  64     uint32_t primID;
  65     uint32_t renderTargetArrayIndex;
  66 };
  67
  68 //////////////////////////////////////////////////////////////////////////
  69 /// SWR_TRIANGLE_DESC
  70 /////////////////////////////////////////////////////////////////////////
  71 struct SWR_TRIANGLE_DESC
  72 {
  73     float I[3];
  74     float J[3];
  75     float Z[3];
  76     float OneOverW[3];
  77     float recipDet;
  78
  79     float *pRecipW;
  80     float *pAttribs;
  81     float *pPerspAttribs;
  82     float *pSamplePos;
  83     float *pUserClipBuffer;
  84
  85     uint64_t coverageMask[SWR_MAX_NUM_MULTISAMPLES];
  86     uint64_t conservativeCoverageMask;
  87     uint64_t innerConservativeCoverageMask;
  88     uint64_t anyCoveredSamples;
  89
  90     TRI_FLAGS triFlags;
  91 };
  92
  93 struct TRIANGLE_WORK_DESC
  94 {
  95     float *pTriBuffer;
  96     float *pAttribs;
  97     float *pUserClipBuffer;
  98     uint32_t numAttribs;
  99     TRI_FLAGS triFlags;
 100 };
 101
 102 union CLEAR_FLAGS
 103 {
 104     struct
 105     {
 106         uint32_t mask : 3;
 107     };
 108     uint32_t bits;
 109 };
 110
 111 struct CLEAR_DESC
 112 {
 113     CLEAR_FLAGS flags;
 114     float clearRTColor[4];  // RGBA_32F
 115     float clearDepth;   // [0..1]
 116     uint8_t clearStencil;
 117 };
 118
 119 struct DISCARD_INVALIDATE_TILES_DESC
 120 {
 121     uint32_t attachmentMask;
 122     SWR_RECT rect;
 123     SWR_TILE_STATE newTileState;
 124     bool createNewTiles;
 125     bool fullTilesOnly;
 126 };
 127
 128 struct SYNC_DESC
 129 {
 130     PFN_CALLBACK_FUNC pfnCallbackFunc;
 131     uint64_t userData;
 132     uint64_t userData2;
 133     uint64_t userData3;
 134 };
 135
 136 struct QUERY_DESC
 137 {
 138     SWR_STATS* pStats;
 139 };
 140
 141 struct STORE_TILES_DESC
 142 {
 143     SWR_RENDERTARGET_ATTACHMENT attachment;
 144     SWR_TILE_STATE postStoreTileState;
 145 };
 146
 147 struct COMPUTE_DESC
 148 {
 149     uint32_t threadGroupCountX;
 150     uint32_t threadGroupCountY;
 151     uint32_t threadGroupCountZ;
 152 };
 153
 154 typedef void(*PFN_WORK_FUNC)(DRAW_CONTEXT* pDC, uint32_t workerId, uint32_t macroTile, void* pDesc);
 155
 156 enum WORK_TYPE
 157 {
 158     SYNC,
 159     DRAW,
 160     CLEAR,
 161     DISCARDINVALIDATETILES,
 162     STORETILES,
 163     QUERYSTATS,
 164 };
 165
 166 struct BE_WORK
 167 {
 168     WORK_TYPE type;
 169     PFN_WORK_FUNC pfnWork;
 170     union
 171     {
 172         SYNC_DESC sync;
 173         TRIANGLE_WORK_DESC tri;
 174         CLEAR_DESC clear;
 175         DISCARD_INVALIDATE_TILES_DESC discardInvalidateTiles;
 176         STORE_TILES_DESC storeTiles;
 177         QUERY_DESC queryStats;
 178     } desc;
 179 };
 180
 181 struct DRAW_WORK
 182 {
 183     DRAW_CONTEXT*   pDC;
 184     union
 185     {
 186         uint32_t   numIndices;      // DrawIndexed: Number of indices for draw.
 187         uint32_t   numVerts;        // Draw: Number of verts (triangles, lines, etc)
 188     };
 189     union
 190     {
 191         const int32_t* pIB;        // DrawIndexed: App supplied indices
 192         uint32_t   startVertex;    // Draw: Starting vertex in VB to render from.
 193     };
 194     int32_t    baseVertex;
 195     uint32_t   numInstances;        // Number of instances
 196     uint32_t   startInstance;       // Instance offset
 197     uint32_t   startPrimID;         // starting primitiveID for this draw batch
 198     uint32_t   startVertexID;       // starting VertexID for this draw batch (only needed for non-indexed draws)
 199     SWR_FORMAT type;                // index buffer type
 200 };
 201
 202 typedef void(*PFN_FE_WORK_FUNC)(SWR_CONTEXT* pContext, DRAW_CONTEXT* pDC, uint32_t workerId, void* pDesc);
 203 struct FE_WORK
 204 {
 205     WORK_TYPE type;
 206     PFN_FE_WORK_FUNC pfnWork;
 207     union
 208     {
 209         SYNC_DESC sync;
 210         DRAW_WORK draw;
 211         CLEAR_DESC clear;
 212         DISCARD_INVALIDATE_TILES_DESC discardInvalidateTiles;
 213         STORE_TILES_DESC storeTiles;
 214         QUERY_DESC queryStats;
 215     } desc;
 216 };
 217
 218 struct GUARDBAND
 219 {
 220     float left, right, top, bottom;
 221 };
 222
 223 struct PA_STATE;
 224
 225 // function signature for pipeline stages that execute after primitive assembly
 226 typedef void(*PFN_PROCESS_PRIMS)(DRAW_CONTEXT *pDC, PA_STATE& pa, uint32_t workerId, simdvector prims[],
 227     uint32_t primMask, simdscalari primID);
 228
 229 OSALIGNLINE(struct) API_STATE
 230 {
 231     // Vertex Buffers
 232     SWR_VERTEX_BUFFER_STATE vertexBuffers[KNOB_NUM_STREAMS];
 233
 234     // Index Buffer
 235     SWR_INDEX_BUFFER_STATE  indexBuffer;
 236
 237     // FS - Fetch Shader State
 238     PFN_FETCH_FUNC          pfnFetchFunc;
 239
 240     // VS - Vertex Shader State
 241     PFN_VERTEX_FUNC         pfnVertexFunc;
 242
 243     // GS - Geometry Shader State
 244     PFN_GS_FUNC             pfnGsFunc;
 245     SWR_GS_STATE            gsState;
 246
 247     // CS - Compute Shader
 248     PFN_CS_FUNC             pfnCsFunc;
 249     uint32_t                totalThreadsInGroup;
 250     uint32_t                totalSpillFillSize;
 251
 252     // FE - Frontend State
 253     SWR_FRONTEND_STATE      frontendState;
 254
 255     // SOS - Streamout Shader State
 256     PFN_SO_FUNC             pfnSoFunc[MAX_SO_STREAMS];
 257
 258     // Streamout state
 259     SWR_STREAMOUT_STATE     soState;
 260     mutable SWR_STREAMOUT_BUFFER soBuffer[MAX_SO_STREAMS];
 261
 262     // Tessellation State
 263     PFN_HS_FUNC             pfnHsFunc;
 264     PFN_DS_FUNC             pfnDsFunc;
 265     SWR_TS_STATE            tsState;
 266
 267     // Specifies which VS outputs are sent to PS.
 268     // Does not include position
 269     uint32_t                linkageMask;
 270     uint32_t                linkageCount;
 271     uint8_t                 linkageMap[MAX_ATTRIBUTES];
 272
 273     // attrib mask, specifies the total set of attributes used
 274     // by the frontend (vs, so, gs)
 275     uint32_t                feAttribMask;
 276
 277     PRIMITIVE_TOPOLOGY      topology;
 278     bool                    forceFront;
 279
 280     // RS - Rasterizer State
 281     SWR_RASTSTATE           rastState;
 282     // floating point multisample offsets
 283     float samplePos[SWR_MAX_NUM_MULTISAMPLES * 2];
 284
 285     GUARDBAND               gbState;
 286
 287     SWR_VIEWPORT            vp[KNOB_NUM_VIEWPORTS_SCISSORS];
 288     SWR_VIEWPORT_MATRIX     vpMatrix[KNOB_NUM_VIEWPORTS_SCISSORS];
 289
 290     BBOX                    scissorRects[KNOB_NUM_VIEWPORTS_SCISSORS];
 291     BBOX                    scissorInFixedPoint;
 292
 293     // Backend state
 294     SWR_BACKEND_STATE       backendState;
 295
 296     // PS - Pixel shader state
 297     SWR_PS_STATE            psState;
 298
 299     SWR_DEPTH_STENCIL_STATE depthStencilState;
 300
 301     // OM - Output Merger State
 302     SWR_BLEND_STATE         blendState;
 303     PFN_BLEND_JIT_FUNC      pfnBlendFunc[SWR_NUM_RENDERTARGETS];
 304
 305     // Stats are incremented when this is true.
 306     bool enableStats;
 307
 308     struct
 309     {
 310         uint32_t colorHottileEnable : 8;
 311         uint32_t depthHottileEnable: 1;
 312         uint32_t stencilHottileEnable : 1;
 313     };
 314
 315     PFN_QUANTIZE_DEPTH      pfnQuantizeDepth;
 316 };
 317
 318 class MacroTileMgr;
 319 class DispatchQueue;
 320
 321 struct RenderOutputBuffers
 322 {
 323     uint8_t* pColor[SWR_NUM_RENDERTARGETS];
 324     uint8_t* pDepth;
 325     uint8_t* pStencil;
 326 };
 327
 328 // Plane equation A/B/C coeffs used to evaluate I/J barycentric coords
 329 struct BarycentricCoeffs
 330 {
 331     simdscalar vIa;
 332     simdscalar vIb;
 333     simdscalar vIc;
 334
 335     simdscalar vJa;
 336     simdscalar vJb;
 337     simdscalar vJc;
 338
 339     simdscalar vZa;
 340     simdscalar vZb;
 341     simdscalar vZc;
 342
 343     simdscalar vRecipDet;
 344
 345     simdscalar vAOneOverW;
 346     simdscalar vBOneOverW;
 347     simdscalar vCOneOverW;
 348 };
 349
 350 // pipeline function pointer types
 351 typedef void(*PFN_BACKEND_FUNC)(DRAW_CONTEXT*, uint32_t, uint32_t, uint32_t, SWR_TRIANGLE_DESC&, RenderOutputBuffers&);
 352 typedef void(*PFN_OUTPUT_MERGER)(SWR_PS_CONTEXT &, uint8_t* (&)[SWR_NUM_RENDERTARGETS], uint32_t, const SWR_BLEND_STATE*,
 353                                  const PFN_BLEND_JIT_FUNC (&)[SWR_NUM_RENDERTARGETS], simdscalar&, simdscalar);
 354 typedef void(*PFN_CALC_PIXEL_BARYCENTRICS)(const BarycentricCoeffs&, SWR_PS_CONTEXT &);
 355 typedef void(*PFN_CALC_SAMPLE_BARYCENTRICS)(const BarycentricCoeffs&, SWR_PS_CONTEXT&);
 356 typedef void(*PFN_CALC_CENTROID_BARYCENTRICS)(const BarycentricCoeffs&, SWR_PS_CONTEXT &, const uint64_t *const, const uint32_t,
 357                                               const simdscalar, const simdscalar);
 358
 359 struct BACKEND_FUNCS
 360 {
 361     PFN_BACKEND_FUNC pfnBackend;
 362 };
 363
 364 // Draw State
 365 struct DRAW_STATE
 366 {
 367     API_STATE state;
 368
 369     void* pPrivateState;  // Its required the driver sets this up for each draw.
 370
 371     // pipeline function pointers, filled in by API thread when setting up the draw
 372     BACKEND_FUNCS backendFuncs;
 373     PFN_PROCESS_PRIMS pfnProcessPrims;
 374
 375     CachingArena* pArena;     // This should only be used by API thread.
 376 };
 377
 378 // Draw Context
 379 //    The api thread sets up a draw context that exists for the life of the draw.
 380 //    This draw context maintains all of the state needed for the draw operation.
 381 struct DRAW_CONTEXT
 382 {
 383     SWR_CONTEXT*    pContext;
 384     uint32_t        drawId;
 385     uint32_t        dependency;
 386     union
 387     {
 388         MacroTileMgr*   pTileMgr;
 389         DispatchQueue*  pDispatch;      // Queue for thread groups. (isCompute)
 390     };
 391     DRAW_STATE*     pState;
 392     CachingArena*   pArena;
 393
 394     bool            isCompute;      // Is this DC a compute context?
 395     bool            cleanupState;   // True if this is the last draw using an entry in the state ring.
 396     volatile bool   doneFE;         // Is FE work done for this draw?
 397
 398     FE_WORK         FeWork;
 399
 400     volatile OSALIGNLINE(uint32_t)   FeLock;
 401     volatile int64_t    threadsDone;
 402 };
 403
 404 static_assert((sizeof(DRAW_CONTEXT) & 63) == 0, "Invalid size for DRAW_CONTEXT");
 405
 406 INLINE const API_STATE& GetApiState(const DRAW_CONTEXT* pDC)
 407 {
 408     SWR_ASSERT(pDC != nullptr);
 409     SWR_ASSERT(pDC->pState != nullptr);
 410
 411     return pDC->pState->state;
 412 }
 413
 414 INLINE void* GetPrivateState(const DRAW_CONTEXT* pDC)
 415 {
 416     SWR_ASSERT(pDC != nullptr);
 417     SWR_ASSERT(pDC->pState != nullptr);
 418
 419     return pDC->pState->pPrivateState;
 420 }
 421
 422 class HotTileMgr;
 423
 424 struct SWR_CONTEXT
 425 {
 426     // Draw Context Ring
 427     //  Each draw needs its own state in order to support mulitple draws in flight across multiple threads.
 428     //  We maintain N draw contexts configured as a ring. The size of the ring limits the maximum number
 429     //  of draws that can be in flight at any given time.
 430     //
 431     //  Description:
 432     //  1. State - When an application first sets state we'll request a new draw context to use.
 433     //     a. If there are no available draw contexts then we'll have to wait until one becomes free.
 434     //     b. If one is available then set pCurDrawContext to point to it and mark it in use.
 435     //     c. All state calls set state on pCurDrawContext.
 436     //  2. Draw - Creates submits a work item that is associated with current draw context.
 437     //     a. Set pPrevDrawContext = pCurDrawContext
 438     //     b. Set pCurDrawContext to NULL.
 439     //  3. State - When an applications sets state after draw
 440     //     a. Same as step 1.
 441     //     b. State is copied from prev draw context to current.
 442     RingBuffer<DRAW_CONTEXT> dcRing;
 443
 444     DRAW_CONTEXT *pCurDrawContext;    // This points to DC entry in ring for an unsubmitted draw.
 445     DRAW_CONTEXT *pPrevDrawContext;   // This points to DC entry for the previous context submitted that we can copy state from.
 446
 447     MacroTileMgr* pMacroTileManagerArray;
 448     DispatchQueue* pDispatchQueueArray;
 449
 450     // Draw State Ring
 451     //  When draw are very large (lots of primitives) then the API thread will break these up.
 452     //  These split draws all have identical state. So instead of storing the state directly
 453     //  in the Draw Context (DC) we instead store it in a Draw State (DS). This allows multiple DCs
 454     //  to reference a single entry in the DS ring.
 455     RingBuffer<DRAW_STATE> dsRing;
 456
 457     uint32_t curStateId;               // Current index to the next available entry in the DS ring.
 458
 459     uint32_t NumWorkerThreads;
 460     uint32_t NumFEThreads;
 461     uint32_t NumBEThreads;
 462
 463     THREAD_POOL threadPool; // Thread pool associated with this context
 464
 465     std::condition_variable FifosNotEmpty;
 466     std::mutex WaitLock;
 467
 468     DRIVER_TYPE driverType;
 469
 470     uint32_t privateStateSize;
 471
 472     HotTileMgr *pHotTileMgr;
 473
 474     // tile load/store functions, passed in at create context time
 475     PFN_LOAD_TILE pfnLoadTile;
 476     PFN_STORE_TILE pfnStoreTile;
 477     PFN_CLEAR_TILE pfnClearTile;
 478
 479     // Global Stats
 480     SWR_STATS stats[KNOB_MAX_NUM_THREADS];
 481
 482     // Scratch space for workers.
 483     uint8_t* pScratch[KNOB_MAX_NUM_THREADS];
 484
 485     CachingAllocator cachingArenaAllocator;
 486     uint32_t frameCount;
 487 };
 488
 489 void WaitForDependencies(SWR_CONTEXT *pContext, uint64_t drawId);
 490 void WakeAllThreads(SWR_CONTEXT *pContext);
 491
 492 #define UPDATE_STAT(name, count) if (GetApiState(pDC).enableStats) { pContext->stats[workerId].name += count; }
 493 #define SET_STAT(name, count) if (GetApiState(pDC).enableStats) { pContext->stats[workerId].name = count; }