1 /* 2 * Copyright 2010 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrDrawTarget_DEFINED 9 #define GrDrawTarget_DEFINED 10 11 #include "GrClipData.h" 12 #include "GrContext.h" 13 #include "GrDrawState.h" 14 #include "GrIndexBuffer.h" 15 #include "GrTraceMarker.h" 16 17 #include "SkClipStack.h" 18 #include "SkMatrix.h" 19 #include "SkPath.h" 20 #include "SkStrokeRec.h" 21 #include "SkTArray.h" 22 #include "SkTLazy.h" 23 #include "SkTypes.h" 24 #include "SkXfermode.h" 25 26 class GrClipData; 27 class GrDrawTargetCaps; 28 class GrPath; 29 class GrVertexBuffer; 30 31 class GrDrawTarget : public SkRefCnt { 32 protected: 33 class DrawInfo; 34 35 public: 36 SK_DECLARE_INST_COUNT(GrDrawTarget) 37 38 /////////////////////////////////////////////////////////////////////////// 39 40 // The context may not be fully constructed and should not be used during GrDrawTarget 41 // construction. 42 GrDrawTarget(GrContext* context); 43 virtual ~GrDrawTarget(); 44 45 /** 46 * Gets the capabilities of the draw target. 47 */ 48 const GrDrawTargetCaps* caps() const { return fCaps.get(); } 49 50 /** 51 * Sets the current clip to the region specified by clip. All draws will be 52 * clipped against this clip if kClip_StateBit is enabled. 53 * 54 * Setting the clip may (or may not) zero out the client's stencil bits. 55 * 56 * @param description of the clipping region 57 */ 58 void setClip(const GrClipData* clip); 59 60 /** 61 * Gets the current clip. 62 * 63 * @return the clip. 64 */ 65 const GrClipData* getClip() const; 66 67 /** 68 * Sets the draw state object for the draw target. Note that this does not 69 * make a copy. The GrDrawTarget will take a reference to passed object. 70 * Passing NULL will cause the GrDrawTarget to use its own internal draw 71 * state object rather than an externally provided one. 72 */ 73 void setDrawState(GrDrawState* drawState); 74 75 /** 76 * Read-only access to the GrDrawTarget's current draw state. 77 */ 78 const GrDrawState& getDrawState() const { return *fDrawState; } 79 80 /** 81 * Read-write access to the GrDrawTarget's current draw state. Note that 82 * this doesn't ref. 83 */ 84 GrDrawState* drawState() { return fDrawState; } 85 86 /** 87 * Color alpha and coverage are two inputs to the drawing pipeline. For some 88 * blend modes it is safe to fold the coverage into constant or per-vertex 89 * color alpha value. For other blend modes they must be handled separately. 90 * Depending on features available in the underlying 3D API this may or may 91 * not be possible. 92 * 93 * This function considers the current draw state and the draw target's 94 * capabilities to determine whether coverage can be handled correctly. The 95 * following assumptions are made: 96 * 1. The caller intends to somehow specify coverage. This can be 97 * specified either by enabling a coverage stage on the GrDrawState or 98 * via the vertex layout. 99 * 2. Other than enabling coverage stages or enabling coverage in the 100 * layout, the current configuration of the target's GrDrawState is as 101 * it will be at draw time. 102 */ 103 bool canApplyCoverage() const; 104 105 /** When we're using coverage AA but the blend is incompatible (given gpu 106 * limitations) we should disable AA. */ 107 bool shouldDisableCoverageAAForBlend() { 108 // Enable below if we should draw with AA even when it produces 109 // incorrect blending. 110 // return false; 111 return !this->canApplyCoverage(); 112 } 113 114 /** 115 * Given the current draw state and hw support, will HW AA lines be used (if 116 * a line primitive type is drawn)? 117 */ 118 bool willUseHWAALines() const; 119 120 /** 121 * There are three types of "sources" of geometry (vertices and indices) for 122 * draw calls made on the target. When performing an indexed draw, the 123 * indices and vertices can use different source types. Once a source is 124 * specified it can be used for multiple draws. However, the time at which 125 * the geometry data is no longer editable depends on the source type. 126 * 127 * Sometimes it is necessary to perform a draw while upstack code has 128 * already specified geometry that it isn't finished with. So there are push 129 * and pop methods. This allows the client to push the sources, draw 130 * something using alternate sources, and then pop to restore the original 131 * sources. 132 * 133 * Aside from pushes and pops, a source remains valid until another source 134 * is set or resetVertexSource / resetIndexSource is called. Drawing from 135 * a reset source is an error. 136 * 137 * The three types of sources are: 138 * 139 * 1. A cpu array (set*SourceToArray). This is useful when the caller 140 * already provided vertex data in a format compatible with a 141 * GrVertexLayout. The data in the array is consumed at the time that 142 * set*SourceToArray is called and subsequent edits to the array will not 143 * be reflected in draws. 144 * 145 * 2. Reserve. This is most useful when the caller has data it must 146 * transform before drawing and is not long-lived. The caller requests 147 * that the draw target make room for some amount of vertex and/or index 148 * data. The target provides ptrs to hold the vertex and/or index data. 149 * 150 * The data is writable up until the next drawIndexed, drawNonIndexed, 151 * drawIndexedInstances, drawRect, copySurface, or pushGeometrySource. At 152 * this point the data is frozen and the ptrs are no longer valid. 153 * 154 * Where the space is allocated and how it is uploaded to the GPU is 155 * subclass-dependent. 156 * 157 * 3. Vertex and Index Buffers. This is most useful for geometry that will 158 * is long-lived. When the data in the buffer is consumed depends on the 159 * GrDrawTarget subclass. For deferred subclasses the caller has to 160 * guarantee that the data is still available in the buffers at playback. 161 * (TODO: Make this more automatic as we have done for read/write pixels) 162 * 163 * The size of each vertex is determined by querying the current GrDrawState. 164 */ 165 166 /** 167 * Reserves space for vertices and/or indices. Zero can be specifed as 168 * either the vertex or index count if the caller desires to only reserve 169 * space for only indices or only vertices. If zero is specifed for 170 * vertexCount then the vertex source will be unmodified and likewise for 171 * indexCount. 172 * 173 * If the function returns true then the reserve suceeded and the vertices 174 * and indices pointers will point to the space created. 175 * 176 * If the target cannot make space for the request then this function will 177 * return false. If vertexCount was non-zero then upon failure the vertex 178 * source is reset and likewise for indexCount. 179 * 180 * The pointers to the space allocated for vertices and indices remain valid 181 * until a drawIndexed, drawNonIndexed, drawIndexedInstances, drawRect, 182 * copySurface, or push/popGeomtrySource is called. At that point logically a 183 * snapshot of the data is made and the pointers are invalid. 184 * 185 * @param vertexCount the number of vertices to reserve space for. Can be 186 * 0. Vertex size is queried from the current GrDrawState. 187 * @param indexCount the number of indices to reserve space for. Can be 0. 188 * @param vertices will point to reserved vertex space if vertexCount is 189 * non-zero. Illegal to pass NULL if vertexCount > 0. 190 * @param indices will point to reserved index space if indexCount is 191 * non-zero. Illegal to pass NULL if indexCount > 0. 192 */ 193 bool reserveVertexAndIndexSpace(int vertexCount, 194 int indexCount, 195 void** vertices, 196 void** indices); 197 198 /** 199 * Provides hints to caller about the number of vertices and indices 200 * that can be allocated cheaply. This can be useful if caller is reserving 201 * space but doesn't know exactly how much geometry is needed. 202 * 203 * Also may hint whether the draw target should be flushed first. This is 204 * useful for deferred targets. 205 * 206 * @param vertexCount in: hint about how many vertices the caller would 207 * like to allocate. Vertex size is queried from the 208 * current GrDrawState. 209 * out: a hint about the number of vertices that can be 210 * allocated cheaply. Negative means no hint. 211 * Ignored if NULL. 212 * @param indexCount in: hint about how many indices the caller would 213 * like to allocate. 214 * out: a hint about the number of indices that can be 215 * allocated cheaply. Negative means no hint. 216 * Ignored if NULL. 217 * 218 * @return true if target should be flushed based on the input values. 219 */ 220 virtual bool geometryHints(int* vertexCount, 221 int* indexCount) const; 222 223 /** 224 * Sets source of vertex data for the next draw. Array must contain 225 * the vertex data when this is called. 226 * 227 * @param vertexArray cpu array containing vertex data. 228 * @param vertexCount the number of vertices in the array. Vertex size is 229 * queried from the current GrDrawState. 230 */ 231 void setVertexSourceToArray(const void* vertexArray, int vertexCount); 232 233 /** 234 * Sets source of index data for the next indexed draw. Array must contain 235 * the indices when this is called. 236 * 237 * @param indexArray cpu array containing index data. 238 * @param indexCount the number of indices in the array. 239 */ 240 void setIndexSourceToArray(const void* indexArray, int indexCount); 241 242 /** 243 * Sets source of vertex data for the next draw. Data does not have to be 244 * in the buffer until drawIndexed, drawNonIndexed, or drawIndexedInstances. 245 * 246 * @param buffer vertex buffer containing vertex data. Must be 247 * unlocked before draw call. Vertex size is queried 248 * from current GrDrawState. 249 */ 250 void setVertexSourceToBuffer(const GrVertexBuffer* buffer); 251 252 /** 253 * Sets source of index data for the next indexed draw. Data does not have 254 * to be in the buffer until drawIndexed. 255 * 256 * @param buffer index buffer containing indices. Must be unlocked 257 * before indexed draw call. 258 */ 259 void setIndexSourceToBuffer(const GrIndexBuffer* buffer); 260 261 /** 262 * Resets vertex source. Drawing from reset vertices is illegal. Set vertex 263 * source to reserved, array, or buffer before next draw. May be able to free 264 * up temporary storage allocated by setVertexSourceToArray or 265 * reserveVertexSpace. 266 */ 267 void resetVertexSource(); 268 269 /** 270 * Resets index source. Indexed Drawing from reset indices is illegal. Set 271 * index source to reserved, array, or buffer before next indexed draw. May 272 * be able to free up temporary storage allocated by setIndexSourceToArray 273 * or reserveIndexSpace. 274 */ 275 void resetIndexSource(); 276 277 /** 278 * Query to find out if the vertex or index source is reserved. 279 */ 280 bool hasReservedVerticesOrIndices() const { 281 return kReserved_GeometrySrcType == this->getGeomSrc().fVertexSrc || 282 kReserved_GeometrySrcType == this->getGeomSrc().fIndexSrc; 283 } 284 285 /** 286 * Pushes and resets the vertex/index sources. Any reserved vertex / index 287 * data is finalized (i.e. cannot be updated after the matching pop but can 288 * be drawn from). Must be balanced by a pop. 289 */ 290 void pushGeometrySource(); 291 292 /** 293 * Pops the vertex / index sources from the matching push. 294 */ 295 void popGeometrySource(); 296 297 /** 298 * Draws indexed geometry using the current state and current vertex / index 299 * sources. 300 * 301 * @param type The type of primitives to draw. 302 * @param startVertex the vertex in the vertex array/buffer corresponding 303 * to index 0 304 * @param startIndex first index to read from index src. 305 * @param vertexCount one greater than the max index. 306 * @param indexCount the number of index elements to read. The index count 307 * is effectively trimmed to the last completely 308 * specified primitive. 309 * @param devBounds optional bounds hint. This is a promise from the caller, 310 * not a request for clipping. 311 */ 312 void drawIndexed(GrPrimitiveType type, 313 int startVertex, 314 int startIndex, 315 int vertexCount, 316 int indexCount, 317 const SkRect* devBounds = NULL); 318 319 /** 320 * Draws non-indexed geometry using the current state and current vertex 321 * sources. 322 * 323 * @param type The type of primitives to draw. 324 * @param startVertex the vertex in the vertex array/buffer corresponding 325 * to index 0 326 * @param vertexCount one greater than the max index. 327 * @param devBounds optional bounds hint. This is a promise from the caller, 328 * not a request for clipping. 329 */ 330 void drawNonIndexed(GrPrimitiveType type, 331 int startVertex, 332 int vertexCount, 333 const SkRect* devBounds = NULL); 334 335 /** 336 * Draws path into the stencil buffer. The fill must be either even/odd or 337 * winding (not inverse or hairline). It will respect the HW antialias flag 338 * on the draw state (if possible in the 3D API). 339 */ 340 void stencilPath(const GrPath*, SkPath::FillType fill); 341 342 /** 343 * Draws a path. Fill must not be a hairline. It will respect the HW 344 * antialias flag on the draw state (if possible in the 3D API). 345 */ 346 void drawPath(const GrPath*, SkPath::FillType fill); 347 348 /** 349 * Draws many paths. It will respect the HW 350 * antialias flag on the draw state (if possible in the 3D API). 351 * 352 * @param transforms array of 2d affine transformations, one for each path. 353 * @param fill the fill type for drawing all the paths. Fill must not be a 354 * hairline. 355 * @param stroke the stroke for drawing all the paths. 356 */ 357 void drawPaths(int pathCount, const GrPath** paths, 358 const SkMatrix* transforms, SkPath::FillType fill, 359 SkStrokeRec::Style stroke); 360 361 /** 362 * Helper function for drawing rects. It performs a geometry src push and pop 363 * and thus will finalize any reserved geometry. 364 * 365 * @param rect the rect to draw 366 * @param matrix optional matrix applied to rect (before viewMatrix) 367 * @param localRect optional rect that specifies local coords to map onto 368 * rect. If NULL then rect serves as the local coords. 369 * @param localMatrix optional matrix applied to localRect. If 370 * srcRect is non-NULL and srcMatrix is non-NULL 371 * then srcRect will be transformed by srcMatrix. 372 * srcMatrix can be NULL when no srcMatrix is desired. 373 */ 374 void drawRect(const SkRect& rect, 375 const SkMatrix* matrix, 376 const SkRect* localRect, 377 const SkMatrix* localMatrix) { 378 AutoGeometryPush agp(this); 379 this->onDrawRect(rect, matrix, localRect, localMatrix); 380 } 381 382 /** 383 * Helper for drawRect when the caller doesn't need separate local rects or matrices. 384 */ 385 void drawSimpleRect(const SkRect& rect, const SkMatrix* matrix = NULL) { 386 this->drawRect(rect, matrix, NULL, NULL); 387 } 388 void drawSimpleRect(const SkIRect& irect, const SkMatrix* matrix = NULL) { 389 SkRect rect = SkRect::Make(irect); 390 this->drawRect(rect, matrix, NULL, NULL); 391 } 392 393 /** 394 * This call is used to draw multiple instances of some geometry with a 395 * given number of vertices (V) and indices (I) per-instance. The indices in 396 * the index source must have the form i[k+I] == i[k] + V. Also, all indices 397 * i[kI] ... i[(k+1)I-1] must be elements of the range kV ... (k+1)V-1. As a 398 * concrete example, the following index buffer for drawing a series of 399 * quads each as two triangles each satisfies these conditions with V=4 and 400 * I=6: 401 * (0,1,2,0,2,3, 4,5,6,4,6,7, 8,9,10,8,10,11, ...) 402 * 403 * The call assumes that the pattern of indices fills the entire index 404 * source. The size of the index buffer limits the number of instances that 405 * can be drawn by the GPU in a single draw. However, the caller may specify 406 * any (positive) number for instanceCount and if necessary multiple GPU 407 * draws will be issued. Moreover, when drawIndexedInstances is called 408 * multiple times it may be possible for GrDrawTarget to group them into a 409 * single GPU draw. 410 * 411 * @param type the type of primitives to draw 412 * @param instanceCount the number of instances to draw. Each instance 413 * consists of verticesPerInstance vertices indexed by 414 * indicesPerInstance indices drawn as the primitive 415 * type specified by type. 416 * @param verticesPerInstance The number of vertices in each instance (V 417 * in the above description). 418 * @param indicesPerInstance The number of indices in each instance (I 419 * in the above description). 420 * @param devBounds optional bounds hint. This is a promise from the caller, 421 * not a request for clipping. 422 */ 423 void drawIndexedInstances(GrPrimitiveType type, 424 int instanceCount, 425 int verticesPerInstance, 426 int indicesPerInstance, 427 const SkRect* devBounds = NULL); 428 429 /** 430 * Clear the current render target if one isn't passed in. Ignores the 431 * clip and all other draw state (blend mode, stages, etc). Clears the 432 * whole thing if rect is NULL, otherwise just the rect. If canIgnoreRect 433 * is set then the entire render target can be optionally cleared. 434 */ 435 virtual void clear(const SkIRect* rect, 436 GrColor color, 437 bool canIgnoreRect, 438 GrRenderTarget* renderTarget = NULL) = 0; 439 440 /** 441 * Discards the contents render target. NULL indicates that the current render target should 442 * be discarded. 443 **/ 444 virtual void discard(GrRenderTarget* = NULL) = 0; 445 446 /** 447 * Called at start and end of gpu trace marking 448 * GR_CREATE_GPU_TRACE_MARKER(marker_str, target) will automatically call these at the start 449 * and end of a code block respectively 450 */ 451 void addGpuTraceMarker(const GrGpuTraceMarker* marker); 452 void removeGpuTraceMarker(const GrGpuTraceMarker* marker); 453 454 /** 455 * Takes the current active set of markers and stores them for later use. Any current marker 456 * in the active set is removed from the active set and the targets remove function is called. 457 * These functions do not work as a stack so you cannot call save a second time before calling 458 * restore. Also, it is assumed that when restore is called the current active set of markers 459 * is empty. When the stored markers are added back into the active set, the targets add marker 460 * is called. 461 */ 462 void saveActiveTraceMarkers(); 463 void restoreActiveTraceMarkers(); 464 465 /** 466 * Copies a pixel rectangle from one surface to another. This call may finalize 467 * reserved vertex/index data (as though a draw call was made). The src pixels 468 * copied are specified by srcRect. They are copied to a rect of the same 469 * size in dst with top left at dstPoint. If the src rect is clipped by the 470 * src bounds then pixel values in the dst rect corresponding to area clipped 471 * by the src rect are not overwritten. This method can fail and return false 472 * depending on the type of surface, configs, etc, and the backend-specific 473 * limitations. If rect is clipped out entirely by the src or dst bounds then 474 * true is returned since there is no actual copy necessary to succeed. 475 */ 476 bool copySurface(GrSurface* dst, 477 GrSurface* src, 478 const SkIRect& srcRect, 479 const SkIPoint& dstPoint); 480 /** 481 * Function that determines whether a copySurface call would succeed without 482 * performing the copy. 483 */ 484 bool canCopySurface(GrSurface* dst, 485 GrSurface* src, 486 const SkIRect& srcRect, 487 const SkIPoint& dstPoint); 488 489 /** 490 * This is can be called before allocating a texture to be a dst for copySurface. It will 491 * populate the origin, config, and flags fields of the desc such that copySurface is more 492 * likely to succeed and be efficient. 493 */ 494 virtual void initCopySurfaceDstDesc(const GrSurface* src, GrTextureDesc* desc); 495 496 497 /** 498 * Release any resources that are cached but not currently in use. This 499 * is intended to give an application some recourse when resources are low. 500 */ 501 virtual void purgeResources() {}; 502 503 /** 504 * For subclass internal use to invoke a call to onDraw(). See DrawInfo below. 505 */ 506 void executeDraw(const DrawInfo& info) { this->onDraw(info); } 507 508 /** 509 * For subclass internal use to invoke a call to onDrawPath(). 510 */ 511 void executeDrawPath(const GrPath* path, SkPath::FillType fill, 512 const GrDeviceCoordTexture* dstCopy) { 513 this->onDrawPath(path, fill, dstCopy); 514 } 515 516 /** 517 * For subclass internal use to invoke a call to onDrawPaths(). 518 */ 519 void executeDrawPaths(int pathCount, const GrPath** paths, 520 const SkMatrix* transforms, SkPath::FillType fill, 521 SkStrokeRec::Style stroke, 522 const GrDeviceCoordTexture* dstCopy) { 523 this->onDrawPaths(pathCount, paths, transforms, fill, stroke, dstCopy); 524 } 525 526 inline bool isGpuTracingEnabled() const { 527 return this->getContext()->isGpuTracingEnabled(); 528 } 529 530 //////////////////////////////////////////////////////////////////////////// 531 532 /** 533 * See AutoStateRestore below. 534 */ 535 enum ASRInit { 536 kPreserve_ASRInit, 537 kReset_ASRInit 538 }; 539 540 /** 541 * Saves off the current state and restores it in the destructor. It will 542 * install a new GrDrawState object on the target (setDrawState) and restore 543 * the previous one in the destructor. The caller should call drawState() to 544 * get the new draw state after the ASR is installed. 545 * 546 * GrDrawState* state = target->drawState(); 547 * AutoStateRestore asr(target, GrDrawTarget::kReset_ASRInit). 548 * state->setRenderTarget(rt); // state refers to the GrDrawState set on 549 * // target before asr was initialized. 550 * // Therefore, rt is set on the GrDrawState 551 * // that will be restored after asr's 552 * // destructor rather than target's current 553 * // GrDrawState. 554 */ 555 class AutoStateRestore : public ::SkNoncopyable { 556 public: 557 /** 558 * Default ASR will have no effect unless set() is subsequently called. 559 */ 560 AutoStateRestore(); 561 562 /** 563 * Saves the state on target. The state will be restored when the ASR 564 * is destroyed. If this constructor is used do not call set(). 565 * 566 * @param init Should the newly installed GrDrawState be a copy of the 567 * previous state or a default-initialized GrDrawState. 568 * @param viewMatrix Optional view matrix. If init = kPreserve then the draw state's 569 * matrix will be preconcat'ed with the param. All stages will be 570 updated to compensate for the matrix change. If init == kReset 571 then the draw state's matrix will be this matrix. 572 */ 573 AutoStateRestore(GrDrawTarget* target, ASRInit init, const SkMatrix* viewMatrix = NULL); 574 575 ~AutoStateRestore(); 576 577 /** 578 * Saves the state on target. The state will be restored when the ASR 579 * is destroyed. This should only be called once per ASR object and only 580 * when the default constructor was used. For nested saves use multiple 581 * ASR objects. 582 * 583 * @param init Should the newly installed GrDrawState be a copy of the 584 * previous state or a default-initialized GrDrawState. 585 * @param viewMatrix Optional view matrix. If init = kPreserve then the draw state's 586 * matrix will be preconcat'ed with the param. All stages will be 587 updated to compensate for the matrix change. If init == kReset 588 then the draw state's matrix will be this matrix. 589 */ 590 void set(GrDrawTarget* target, ASRInit init, const SkMatrix* viewMatrix = NULL); 591 592 /** 593 * Like set() but makes the view matrix identity. When init is kReset it is as though 594 * NULL was passed to set's viewMatrix param. When init is kPreserve it is as though 595 * the inverse view matrix was passed. If kPreserve is passed and the draw state's matrix 596 * is not invertible then this may fail. 597 */ 598 bool setIdentity(GrDrawTarget* target, ASRInit init); 599 600 private: 601 GrDrawTarget* fDrawTarget; 602 SkTLazy<GrDrawState> fTempState; 603 GrDrawState* fSavedState; 604 }; 605 606 //////////////////////////////////////////////////////////////////////////// 607 608 class AutoReleaseGeometry : public ::SkNoncopyable { 609 public: 610 AutoReleaseGeometry(GrDrawTarget* target, 611 int vertexCount, 612 int indexCount); 613 AutoReleaseGeometry(); 614 ~AutoReleaseGeometry(); 615 bool set(GrDrawTarget* target, 616 int vertexCount, 617 int indexCount); 618 bool succeeded() const { return NULL != fTarget; } 619 void* vertices() const { SkASSERT(this->succeeded()); return fVertices; } 620 void* indices() const { SkASSERT(this->succeeded()); return fIndices; } 621 SkPoint* positions() const { 622 return static_cast<SkPoint*>(this->vertices()); 623 } 624 625 private: 626 void reset(); 627 628 GrDrawTarget* fTarget; 629 void* fVertices; 630 void* fIndices; 631 }; 632 633 //////////////////////////////////////////////////////////////////////////// 634 635 class AutoClipRestore : public ::SkNoncopyable { 636 public: 637 AutoClipRestore(GrDrawTarget* target) { 638 fTarget = target; 639 fClip = fTarget->getClip(); 640 } 641 642 AutoClipRestore(GrDrawTarget* target, const SkIRect& newClip); 643 644 ~AutoClipRestore() { 645 fTarget->setClip(fClip); 646 } 647 private: 648 GrDrawTarget* fTarget; 649 const GrClipData* fClip; 650 SkTLazy<SkClipStack> fStack; 651 GrClipData fReplacementClip; 652 }; 653 654 //////////////////////////////////////////////////////////////////////////// 655 656 /** 657 * Saves the geometry src state at construction and restores in the destructor. It also saves 658 * and then restores the vertex attrib state. 659 */ 660 class AutoGeometryPush : public ::SkNoncopyable { 661 public: 662 AutoGeometryPush(GrDrawTarget* target) 663 : fAttribRestore(target->drawState()) { 664 SkASSERT(NULL != target); 665 fTarget = target; 666 target->pushGeometrySource(); 667 } 668 669 ~AutoGeometryPush() { fTarget->popGeometrySource(); } 670 671 private: 672 GrDrawTarget* fTarget; 673 GrDrawState::AutoVertexAttribRestore fAttribRestore; 674 }; 675 676 /** 677 * Combination of AutoGeometryPush and AutoStateRestore. The vertex attribs will be in default 678 * state regardless of ASRInit value. 679 */ 680 class AutoGeometryAndStatePush : public ::SkNoncopyable { 681 public: 682 AutoGeometryAndStatePush(GrDrawTarget* target, 683 ASRInit init, 684 const SkMatrix* viewMatrix = NULL) 685 : fState(target, init, viewMatrix) { 686 SkASSERT(NULL != target); 687 fTarget = target; 688 target->pushGeometrySource(); 689 if (kPreserve_ASRInit == init) { 690 target->drawState()->setDefaultVertexAttribs(); 691 } 692 } 693 694 ~AutoGeometryAndStatePush() { fTarget->popGeometrySource(); } 695 696 private: 697 AutoStateRestore fState; 698 GrDrawTarget* fTarget; 699 }; 700 701 /////////////////////////////////////////////////////////////////////////// 702 // Draw execution tracking (for font atlases and other resources) 703 class DrawToken { 704 public: 705 DrawToken(GrDrawTarget* drawTarget, uint32_t drawID) : 706 fDrawTarget(drawTarget), fDrawID(drawID) {} 707 708 bool isIssued() { return NULL != fDrawTarget && fDrawTarget->isIssued(fDrawID); } 709 710 private: 711 GrDrawTarget* fDrawTarget; 712 uint32_t fDrawID; // this may wrap, but we're doing direct comparison 713 // so that should be okay 714 }; 715 716 virtual DrawToken getCurrentDrawToken() { return DrawToken(this, 0); } 717 718 protected: 719 720 enum GeometrySrcType { 721 kNone_GeometrySrcType, //<! src has not been specified 722 kReserved_GeometrySrcType, //<! src was set using reserve*Space 723 kArray_GeometrySrcType, //<! src was set using set*SourceToArray 724 kBuffer_GeometrySrcType //<! src was set using set*SourceToBuffer 725 }; 726 727 struct GeometrySrcState { 728 GeometrySrcType fVertexSrc; 729 union { 730 // valid if src type is buffer 731 const GrVertexBuffer* fVertexBuffer; 732 // valid if src type is reserved or array 733 int fVertexCount; 734 }; 735 736 GeometrySrcType fIndexSrc; 737 union { 738 // valid if src type is buffer 739 const GrIndexBuffer* fIndexBuffer; 740 // valid if src type is reserved or array 741 int fIndexCount; 742 }; 743 744 size_t fVertexSize; 745 }; 746 747 int indexCountInCurrentSource() const { 748 const GeometrySrcState& src = this->getGeomSrc(); 749 switch (src.fIndexSrc) { 750 case kNone_GeometrySrcType: 751 return 0; 752 case kReserved_GeometrySrcType: 753 case kArray_GeometrySrcType: 754 return src.fIndexCount; 755 case kBuffer_GeometrySrcType: 756 return static_cast<int>(src.fIndexBuffer->gpuMemorySize() / sizeof(uint16_t)); 757 default: 758 SkFAIL("Unexpected Index Source."); 759 return 0; 760 } 761 } 762 763 // This method is called by copySurface The srcRect is guaranteed to be entirely within the 764 // src bounds. Likewise, the dst rect implied by dstPoint and srcRect's width and height falls 765 // entirely within the dst. The default implementation will draw a rect from the src to the 766 // dst if the src is a texture and the dst is a render target and fail otherwise. 767 virtual bool onCopySurface(GrSurface* dst, 768 GrSurface* src, 769 const SkIRect& srcRect, 770 const SkIPoint& dstPoint); 771 772 // Called to determine whether an onCopySurface call would succeed or not. This is useful for 773 // proxy subclasses to test whether the copy would succeed without executing it yet. Derived 774 // classes must keep this consistent with their implementation of onCopySurface(). The inputs 775 // are the same as onCopySurface(), i.e. srcRect and dstPoint are clipped to be inside the src 776 // and dst bounds. 777 virtual bool onCanCopySurface(GrSurface* dst, 778 GrSurface* src, 779 const SkIRect& srcRect, 780 const SkIPoint& dstPoint); 781 782 GrContext* getContext() { return fContext; } 783 const GrContext* getContext() const { return fContext; } 784 785 // A subclass may override this function if it wishes to be notified when the clip is changed. 786 // The override should call INHERITED::clipWillBeSet(). 787 virtual void clipWillBeSet(const GrClipData* clipData); 788 789 // subclasses must call this in their destructors to ensure all vertex 790 // and index sources have been released (including those held by 791 // pushGeometrySource()) 792 void releaseGeometry(); 793 794 // accessors for derived classes 795 const GeometrySrcState& getGeomSrc() const { return fGeoSrcStateStack.back(); } 796 // it is preferable to call this rather than getGeomSrc()->fVertexSize because of the assert. 797 size_t getVertexSize() const { 798 // the vertex layout is only valid if a vertex source has been specified. 799 SkASSERT(this->getGeomSrc().fVertexSrc != kNone_GeometrySrcType); 800 return this->getGeomSrc().fVertexSize; 801 } 802 803 // Subclass must initialize this in its constructor. 804 SkAutoTUnref<const GrDrawTargetCaps> fCaps; 805 806 const GrTraceMarkerSet& getActiveTraceMarkers() { return fActiveTraceMarkers; } 807 808 /** 809 * Used to communicate draws to subclass's onDraw function. 810 */ 811 class DrawInfo { 812 public: 813 DrawInfo(const DrawInfo& di) { (*this) = di; } 814 DrawInfo& operator =(const DrawInfo& di); 815 816 GrPrimitiveType primitiveType() const { return fPrimitiveType; } 817 int startVertex() const { return fStartVertex; } 818 int startIndex() const { return fStartIndex; } 819 int vertexCount() const { return fVertexCount; } 820 int indexCount() const { return fIndexCount; } 821 int verticesPerInstance() const { return fVerticesPerInstance; } 822 int indicesPerInstance() const { return fIndicesPerInstance; } 823 int instanceCount() const { return fInstanceCount; } 824 825 bool isIndexed() const { return fIndexCount > 0; } 826 #ifdef SK_DEBUG 827 bool isInstanced() const; // this version is longer because of asserts 828 #else 829 bool isInstanced() const { return fInstanceCount > 0; } 830 #endif 831 832 // adds or remove instances 833 void adjustInstanceCount(int instanceOffset); 834 // shifts the start vertex 835 void adjustStartVertex(int vertexOffset); 836 // shifts the start index 837 void adjustStartIndex(int indexOffset); 838 839 void setDevBounds(const SkRect& bounds) { 840 fDevBoundsStorage = bounds; 841 fDevBounds = &fDevBoundsStorage; 842 } 843 const SkRect* getDevBounds() const { return fDevBounds; } 844 845 // NULL if no copy of the dst is needed for the draw. 846 const GrDeviceCoordTexture* getDstCopy() const { 847 if (NULL != fDstCopy.texture()) { 848 return &fDstCopy; 849 } else { 850 return NULL; 851 } 852 } 853 854 private: 855 DrawInfo() { fDevBounds = NULL; } 856 857 friend class GrDrawTarget; 858 859 GrPrimitiveType fPrimitiveType; 860 861 int fStartVertex; 862 int fStartIndex; 863 int fVertexCount; 864 int fIndexCount; 865 866 int fInstanceCount; 867 int fVerticesPerInstance; 868 int fIndicesPerInstance; 869 870 SkRect fDevBoundsStorage; 871 SkRect* fDevBounds; 872 873 GrDeviceCoordTexture fDstCopy; 874 }; 875 876 private: 877 // A subclass can optionally overload this function to be notified before 878 // vertex and index space is reserved. 879 virtual void willReserveVertexAndIndexSpace(int vertexCount, int indexCount) {} 880 881 // implemented by subclass to allocate space for reserved geom 882 virtual bool onReserveVertexSpace(size_t vertexSize, int vertexCount, void** vertices) = 0; 883 virtual bool onReserveIndexSpace(int indexCount, void** indices) = 0; 884 // implemented by subclass to handle release of reserved geom space 885 virtual void releaseReservedVertexSpace() = 0; 886 virtual void releaseReservedIndexSpace() = 0; 887 // subclass must consume array contents when set 888 virtual void onSetVertexSourceToArray(const void* vertexArray, int vertexCount) = 0; 889 virtual void onSetIndexSourceToArray(const void* indexArray, int indexCount) = 0; 890 // subclass is notified that geom source will be set away from an array 891 virtual void releaseVertexArray() = 0; 892 virtual void releaseIndexArray() = 0; 893 // subclass overrides to be notified just before geo src state is pushed/popped. 894 virtual void geometrySourceWillPush() = 0; 895 virtual void geometrySourceWillPop(const GeometrySrcState& restoredState) = 0; 896 // subclass called to perform drawing 897 virtual void onDraw(const DrawInfo&) = 0; 898 // Implementation of drawRect. The geometry src and vertex attribs will already 899 // be saved before this is called and restored afterwards. A subclass may override 900 // this to perform more optimal rect rendering. Its draws should be funneled through 901 // one of the public GrDrawTarget draw methods (e.g. drawNonIndexed, 902 // drawIndexedInstances, ...). The base class draws a two triangle fan using 903 // drawNonIndexed from reserved vertex space. 904 virtual void onDrawRect(const SkRect& rect, 905 const SkMatrix* matrix, 906 const SkRect* localRect, 907 const SkMatrix* localMatrix); 908 909 virtual void onStencilPath(const GrPath*, SkPath::FillType) = 0; 910 virtual void onDrawPath(const GrPath*, SkPath::FillType, 911 const GrDeviceCoordTexture* dstCopy) = 0; 912 virtual void onDrawPaths(int, const GrPath**, const SkMatrix*, 913 SkPath::FillType, SkStrokeRec::Style, 914 const GrDeviceCoordTexture* dstCopy) = 0; 915 916 virtual void didAddGpuTraceMarker() = 0; 917 virtual void didRemoveGpuTraceMarker() = 0; 918 919 // helpers for reserving vertex and index space. 920 bool reserveVertexSpace(size_t vertexSize, 921 int vertexCount, 922 void** vertices); 923 bool reserveIndexSpace(int indexCount, void** indices); 924 925 // called by drawIndexed and drawNonIndexed. Use a negative indexCount to 926 // indicate non-indexed drawing. 927 bool checkDraw(GrPrimitiveType type, int startVertex, 928 int startIndex, int vertexCount, 929 int indexCount) const; 930 // called when setting a new vert/idx source to unref prev vb/ib 931 void releasePreviousVertexSource(); 932 void releasePreviousIndexSource(); 933 934 // Makes a copy of the dst if it is necessary for the draw. Returns false if a copy is required 935 // but couldn't be made. Otherwise, returns true. 936 bool setupDstReadIfNecessary(DrawInfo* info) { 937 return this->setupDstReadIfNecessary(&info->fDstCopy, info->getDevBounds()); 938 } 939 bool setupDstReadIfNecessary(GrDeviceCoordTexture* dstCopy, const SkRect* drawBounds); 940 941 // Check to see if this set of draw commands has been sent out 942 virtual bool isIssued(uint32_t drawID) { return true; } 943 944 enum { 945 kPreallocGeoSrcStateStackCnt = 4, 946 }; 947 SkSTArray<kPreallocGeoSrcStateStackCnt, GeometrySrcState, true> fGeoSrcStateStack; 948 const GrClipData* fClip; 949 GrDrawState* fDrawState; 950 GrDrawState fDefaultDrawState; 951 // The context owns us, not vice-versa, so this ptr is not ref'ed by DrawTarget. 952 GrContext* fContext; 953 // To keep track that we always have at least as many debug marker adds as removes 954 int fGpuTraceMarkerCount; 955 GrTraceMarkerSet fActiveTraceMarkers; 956 GrTraceMarkerSet fStoredTraceMarkers; 957 958 typedef SkRefCnt INHERITED; 959 }; 960 961 #endif 962
