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comparison: gfx/skia/trunk/src/gpu/GrDrawTarget.h

gfx/skia/trunk/src/gpu/GrDrawTarget.h

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

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