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1 /* | 1 /* |
2 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef GrGpu_DEFINED | 8 #ifndef GrGpu_DEFINED |
9 #define GrGpu_DEFINED | 9 #define GrGpu_DEFINED |
10 | 10 |
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126 * | 126 * |
127 * @return The index buffer if successful, otherwise NULL. | 127 * @return The index buffer if successful, otherwise NULL. |
128 */ | 128 */ |
129 GrIndexBuffer* createIndexBuffer(size_t size, bool dynamic); | 129 GrIndexBuffer* createIndexBuffer(size_t size, bool dynamic); |
130 | 130 |
131 /** | 131 /** |
132 * Resolves MSAA. | 132 * Resolves MSAA. |
133 */ | 133 */ |
134 void resolveRenderTarget(GrRenderTarget* target); | 134 void resolveRenderTarget(GrRenderTarget* target); |
135 | 135 |
136 /** Info struct returned by getReadPixelsInfo about performing intermediate
draws before | 136 /** Info struct returned by getReadPixelsInfo about performing intermediate
draws before |
137 reading pixels for performance or correctness. */ | 137 reading pixels for performance or correctness. */ |
138 struct ReadPixelTempDrawInfo { | 138 struct ReadPixelTempDrawInfo { |
139 /** If the GrGpu is requesting that the caller do a draw to an intermedi
ate surface then | 139 /** If the GrGpu is requesting that the caller do a draw to an intermedi
ate surface then |
140 this is descriptor for the temp surface. The draw should always be a
rect with | 140 this is descriptor for the temp surface. The draw should always be a
rect with |
141 dst 0,0,w,h. */ | 141 dst 0,0,w,h. */ |
142 GrSurfaceDesc fTempSurfaceDesc; | 142 GrSurfaceDesc fTempSurfaceDesc; |
143 /** Indicates whether there is a performance advantage to using an exact
match texture | 143 /** Indicates whether there is a performance advantage to using an exact
match texture |
144 (in terms of width and height) for the intermediate texture instead
of approximate. */ | 144 (in terms of width and height) for the intermediate texture instead
of approximate. */ |
145 bool fUseExactScratch; | 145 bool fUseExactScratch; |
146 /** The caller should swap the R and B channel in the temp draw and then
instead of reading | 146 /** The caller should swap the R and B channel in the temp draw and then
instead of reading |
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166 caller of getReadPixelsInfo should never specify this on intput. */ | 166 caller of getReadPixelsInfo should never specify this on intput. */ |
167 kGpuPrefersDraw_DrawPreference, | 167 kGpuPrefersDraw_DrawPreference, |
168 /** On input means that the caller requires a draw to do a transformatio
n and there is no | 168 /** On input means that the caller requires a draw to do a transformatio
n and there is no |
169 CPU fallback. | 169 CPU fallback. |
170 On output means that GrGpu can only satisfy the readPixels request i
f the intermediate | 170 On output means that GrGpu can only satisfy the readPixels request i
f the intermediate |
171 draw is performed. | 171 draw is performed. |
172 */ | 172 */ |
173 kRequireDraw_DrawPreference | 173 kRequireDraw_DrawPreference |
174 }; | 174 }; |
175 | 175 |
176 /** | 176 /** Used to negotiates whether and how an intermediate draw should or must b
e performed before |
177 * Used to negotiate whether and how an intermediate draw should or must be
performed before | 177 a readPixels call. If this returns false then GrGpu could not deduce an
intermediate draw |
178 * a readPixels call. If this returns false then GrGpu could not deduce an i
ntermediate draw | 178 that would allow a successful readPixels call. */ |
179 * that would allow a successful readPixels call. The passed width, height,
and rowBytes, | 179 virtual bool getReadPixelsInfo(GrSurface* srcSurface, int readWidth, int rea
dHeight, |
180 * must be non-zero and already reflect clipping to the src bounds. | 180 size_t rowBytes, GrPixelConfig readConfig, Dr
awPreference*, |
181 */ | 181 ReadPixelTempDrawInfo *) = 0; |
182 bool getReadPixelsInfo(GrSurface* srcSurface, int readWidth, int readHeight,
size_t rowBytes, | |
183 GrPixelConfig readConfig, DrawPreference*, ReadPixelT
empDrawInfo*); | |
184 | |
185 /** Info struct returned by getWritePixelsInfo about performing an intermedi
ate draw in order | |
186 to write pixels to a GrSurface for either performance or correctness rea
sons. */ | |
187 struct WritePixelTempDrawInfo { | |
188 /** If the GrGpu is requesting that the caller upload to an intermediate
surface and draw | |
189 that to the dst then this is the descriptor for the intermediate sur
face. The caller | |
190 should upload the pixels such that the upper left pixel of the uploa
d rect is at 0,0 in | |
191 the intermediate surface.*/ | |
192 GrSurfaceDesc fTempSurfaceDesc; | |
193 /** If set, fTempSurfaceDesc's config will be a R/B swap of the src pixe
l config. The caller | |
194 should upload the pixels as is such that R and B will be swapped in
the intermediate | |
195 surface. When the intermediate is drawn to the dst the shader should
swap R/B again | |
196 such that the correct swizzle results in the dst. This is done to wo
rk around either | |
197 performance or API restrictions in the backend 3D API implementation
. */ | |
198 bool fSwapRAndB; | |
199 }; | |
200 | 182 |
201 /** | 183 /** |
202 * Used to negotiate whether and how an intermediate surface should be used
to write pixels to | 184 * Gets a preferred 8888 config to use for writing pixel data to a surface w
ith |
203 * a GrSurface. If this returns false then GrGpu could not deduce an interme
diate draw | 185 * config surfaceConfig. The returned config must have at least as many bits
per channel as the |
204 * that would allow a successful transfer of the src pixels to the dst. The
passed width, | 186 * writeConfig param. |
205 * height, and rowBytes, must be non-zero and already reflect clipping to th
e dst bounds. | |
206 */ | 187 */ |
207 bool getWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t
rowBytes, | 188 virtual GrPixelConfig preferredWritePixelsConfig(GrPixelConfig writeConfig, |
208 GrPixelConfig srcConfig, DrawPreference*, WritePixel
TempDrawInfo*); | 189 GrPixelConfig surfaceConfig
) const { |
| 190 return writeConfig; |
| 191 } |
| 192 |
| 193 /** |
| 194 * Called before uploading writing pixels to a GrTexture when the src pixel
config doesn't |
| 195 * match the texture's config. |
| 196 */ |
| 197 virtual bool canWriteTexturePixels(const GrTexture*, GrPixelConfig srcConfig
) const = 0; |
209 | 198 |
210 /** | 199 /** |
211 * Reads a rectangle of pixels from a render target. | 200 * Reads a rectangle of pixels from a render target. |
212 * | 201 * |
213 * @param renderTarget the render target to read from. NULL means the | 202 * @param renderTarget the render target to read from. NULL means the |
214 * current render target. | 203 * current render target. |
215 * @param left left edge of the rectangle to read (inclusive) | 204 * @param left left edge of the rectangle to read (inclusive) |
216 * @param top top edge of the rectangle to read (inclusive) | 205 * @param top top edge of the rectangle to read (inclusive) |
217 * @param width width of rectangle to read in pixels. | 206 * @param width width of rectangle to read in pixels. |
218 * @param height height of rectangle to read in pixels. | 207 * @param height height of rectangle to read in pixels. |
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405 // stencil funcs supported by GPUs. | 394 // stencil funcs supported by GPUs. |
406 static GrStencilFunc ConvertStencilFunc(bool stencilInClip, | 395 static GrStencilFunc ConvertStencilFunc(bool stencilInClip, |
407 GrStencilFunc func); | 396 GrStencilFunc func); |
408 static void ConvertStencilFuncAndMask(GrStencilFunc func, | 397 static void ConvertStencilFuncAndMask(GrStencilFunc func, |
409 bool clipInStencil, | 398 bool clipInStencil, |
410 unsigned int clipBit, | 399 unsigned int clipBit, |
411 unsigned int userBits, | 400 unsigned int userBits, |
412 unsigned int* ref, | 401 unsigned int* ref, |
413 unsigned int* mask); | 402 unsigned int* mask); |
414 | 403 |
415 static void ElevateDrawPreference(GrGpu::DrawPreference* preference, | |
416 GrGpu::DrawPreference elevation) { | |
417 GR_STATIC_ASSERT(GrGpu::kCallerPrefersDraw_DrawPreference > GrGpu::kNoDr
aw_DrawPreference); | |
418 GR_STATIC_ASSERT(GrGpu::kGpuPrefersDraw_DrawPreference > | |
419 GrGpu::kCallerPrefersDraw_DrawPreference); | |
420 GR_STATIC_ASSERT(GrGpu::kRequireDraw_DrawPreference > | |
421 GrGpu::kGpuPrefersDraw_DrawPreference); | |
422 *preference = SkTMax(*preference, elevation); | |
423 } | |
424 | |
425 const GrTraceMarkerSet& getActiveTraceMarkers() const { return fActiveTraceM
arkers; } | 404 const GrTraceMarkerSet& getActiveTraceMarkers() const { return fActiveTraceM
arkers; } |
426 | 405 |
427 Stats fStats; | 406 Stats fStats; |
428 SkAutoTDelete<GrPathRendering> fPathRendering; | 407 SkAutoTDelete<GrPathRendering> fPathRendering; |
429 // Subclass must initialize this in its constructor. | 408 // Subclass must initialize this in its constructor. |
430 SkAutoTUnref<const GrCaps> fCaps; | 409 SkAutoTUnref<const GrCaps> fCaps; |
431 | 410 |
432 private: | 411 private: |
433 // called when the 3D context state is unknown. Subclass should emit any | 412 // called when the 3D context state is unknown. Subclass should emit any |
434 // assumed 3D context state and dirty any state cache. | 413 // assumed 3D context state and dirty any state cache. |
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454 bool canIgnoreRect) = 0; | 433 bool canIgnoreRect) = 0; |
455 | 434 |
456 | 435 |
457 // Overridden by backend specific classes to perform a clear of the stencil
clip bits. This is | 436 // Overridden by backend specific classes to perform a clear of the stencil
clip bits. This is |
458 // ONLY used by the the clip target | 437 // ONLY used by the the clip target |
459 virtual void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool i
nsideClip) = 0; | 438 virtual void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool i
nsideClip) = 0; |
460 | 439 |
461 // overridden by backend-specific derived class to perform the draw call. | 440 // overridden by backend-specific derived class to perform the draw call. |
462 virtual void onDraw(const DrawArgs&, const GrNonInstancedVertices&) = 0; | 441 virtual void onDraw(const DrawArgs&, const GrNonInstancedVertices&) = 0; |
463 | 442 |
464 virtual bool onGetReadPixelsInfo(GrSurface* srcSurface, int readWidth, int r
eadHeight, | |
465 size_t rowBytes, GrPixelConfig readConfig,
DrawPreference*, | |
466 ReadPixelTempDrawInfo*) = 0; | |
467 virtual bool onGetWritePixelsInfo(GrSurface* dstSurface, int width, int heig
ht, size_t rowBytes, | |
468 GrPixelConfig srcConfig, DrawPreference*, | |
469 WritePixelTempDrawInfo*) = 0; | |
470 | |
471 virtual bool onReadPixels(GrRenderTarget* target, | 443 virtual bool onReadPixels(GrRenderTarget* target, |
472 int left, int top, int width, int height, | 444 int left, int top, int width, int height, |
473 GrPixelConfig, | 445 GrPixelConfig, |
474 void* buffer, | 446 void* buffer, |
475 size_t rowBytes) = 0; | 447 size_t rowBytes) = 0; |
476 | 448 |
477 // overridden by backend-specific derived class to perform the texture updat
e | 449 // overridden by backend-specific derived class to perform the texture updat
e |
478 virtual bool onWriteTexturePixels(GrTexture* texture, | 450 virtual bool onWriteTexturePixels(GrTexture* texture, |
479 int left, int top, int width, int height, | 451 int left, int top, int width, int height, |
480 GrPixelConfig config, const void* buffer, | 452 GrPixelConfig config, const void* buffer, |
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516 GrTraceMarkerSet fActiveT
raceMarkers; | 488 GrTraceMarkerSet fActiveT
raceMarkers; |
517 GrTraceMarkerSet fStoredT
raceMarkers; | 489 GrTraceMarkerSet fStoredT
raceMarkers; |
518 // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu. | 490 // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu. |
519 GrContext* fContext
; | 491 GrContext* fContext
; |
520 | 492 |
521 friend class GrPathRendering; | 493 friend class GrPathRendering; |
522 typedef SkRefCnt INHERITED; | 494 typedef SkRefCnt INHERITED; |
523 }; | 495 }; |
524 | 496 |
525 #endif | 497 #endif |
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