{"id":913,"date":"2023-05-31T00:43:48","date_gmt":"2023-05-30T16:43:48","guid":{"rendered":"http:\/\/www.olinone.com\/?p=913"},"modified":"2023-05-31T19:17:58","modified_gmt":"2023-05-31T11:17:58","slug":"pag%e5%8a%a8%e6%95%88%e6%a1%86%e6%9e%b6%e6%ba%90%e7%a0%81%e7%ac%94%e8%ae%b0-%ef%bc%88%e5%9b%9b%ef%bc%89%e6%b8%b2%e6%9f%93%e6%a1%86%e6%9e%b6","status":"publish","type":"post","link":"http:\/\/www.olinone.com\/?p=913","title":{"rendered":"PAG\u52a8\u6548\u6846\u67b6\u6e90\u7801\u7b14\u8bb0 \uff08\u56db\uff09\u6e32\u67d3\u6846\u67b6"},"content":{"rendered":"

\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\uff1a<\/span>http:\/\/www.olinone.com\/<\/a><\/span><\/p>\n

\u524d\u8a00<\/h1>\n

PAG\u91c7\u7528\u81ea\u7814TGFX\u7279\u6548\u6e32\u67d3\u5f15\u64ce\uff0c\u62bd\u8c61\u5206\u79bb\u4e86\u63a5\u53e3\u53ca\u5e73\u53f0\u5b9e\u73b0\u7c7b\uff0c\u53ef\u4ee5\u6269\u5c55\u652f\u6301\u591a\u79cd\u56fe\u5f62\u6e32\u67d3\u5e93\uff0c\u6bd4\u5982OpenGL\u3001Metal\u7b49<\/span><\/p>\n

TGFX\u5f15\u64ce\u662f\u5982\u4f55\u5b9e\u73b0\u7eb9\u7406\u7ed8\u5236\uff1f\u672c\u6587\u57fa\u4e8eOpenGL\u56fe\u5f62\u5e93\u5206\u6790\u8bb2\u89e3TGFX\u6e32\u67d3\u6846\u67b6\u5206\u5c42\u53ca\u8be6\u7ec6\u67b6\u6784\u8bbe\u8ba1\u3002\u5f00\u59cb\u4e4b\u524d\uff0c\u5148\u63d0\u4e00\u4e2a\u95ee\u9898\uff1a<\/span><\/p>\n

\u7ed8\u5236\u4e00\u4e2aTexture\u7eb9\u7406\u5bf9\u8c61\uff0c\u4e00\u822c\u9700\u8981\u7ecf\u5386\u54ea\u4e9b\u8fc7\u7a0b\uff1f<\/span><\/p>\n

\u6e32\u67d3\u6d41\u7a0b<\/span><\/h1>\n

\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u7ed8\u5236\u4e00\u4e2aTexture\u7eb9\u7406\u5bf9\u8c61\u5230\u76ee\u6807Layer\u4e0a\uff0c\u53ef\u4ee5\u62bd\u8c61\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u9636\u6bb5\uff1a<\/span><\/p>\n

1. \u83b7\u53d6\u4e0a\u4e0b\u6587\uff1a<\/span><\/strong><\/span>\u901a\u8fc7EGL\u83b7\u53d6Context\u7ed8\u5236\u4e0a\u4e0b\u6587\uff0c\u63d0\u4f9b\u4e0e\u6e32\u67d3\u8bbe\u5907\u4ea4\u4e92\u7684\u80fd\u529b\uff0c\u6bd4\u5982\u7f13\u51b2\u533a\u4ea4\u6362\u3001Canvas\u53caPaint\u4ea4\u4e92\u7b49<\/span><\/p>\n

2. \u5b9a\u4e49\u7740\u8272\u5668\uff1a<\/span><\/strong><\/span>\u57fa\u4e8eOpenGL\u7684\u7740\u8272\u5668\u8bed\u8a00\uff08GLSL\uff09\u7f16\u5199\u7740\u8272\u5668\u4ee3\u7801\uff0c\u7f16\u5199\u81ea\u5b9a\u4e49\u9876\u70b9\u7740\u8272\u5668\u548c\u7247\u6bb5\u7740\u8272\u5668\u4ee3\u7801\uff0c\u7f16\u8bd1\u3001\u94fe\u63a5\u52a0\u8f7d\u548c\u4f7f\u7528\u5b83\u4eec<\/span><\/p>\n

3. \u7ed1\u5b9a\u6570\u636e\u6e90\uff1a<\/span><\/strong><\/span>\u57fa\u4e8e\u6e32\u67d3\u5750\u6807\u7cfb\u51e0\u4f55\u8ba1\u7b97\u7ed1\u5b9a\u9876\u70b9\u6570\u636e\uff0c\u52a0\u8f7d\u5e76\u7ed1\u5b9a\u7eb9\u7406\u5bf9\u8c61\u7ed9GPU\uff0c\u8bbe\u7f6e\u6e32\u67d3\u76ee\u6807\u3001\u6df7\u5408\u6a21\u5f0f\u7b49<\/span><\/p>\n

4. \u6e32\u67d3\u6267\u884c\uff1a<\/span><\/strong><\/span>\u63d0\u4ea4\u6e32\u67d3\u547d\u4ee4\u7ed9\u6e32\u67d3\u7ebf\u7a0b\uff0c\u8f6c\u5316\u4e3a\u5e95\u5c42\u56fe\u5f62API\u8c03\u7528\u3001\u5e76\u6267\u884c\u5b9e\u9645\u7684\u6e32\u67d3\u64cd\u4f5c<\/span><\/p>\n

\"img\"<\/span><\/p>\n

\u5173\u4e8eOpenGL\u5b8c\u6574\u7684\u6e32\u67d3\u6d41\u7a0b\uff0c\u7f51\u4e0a\u6709\u6bd4\u8f83\u591a\u7684\u8d44\u6599\u4ecb\u7ecd\uff0c\u5728\u6b64\u4e0d\u518d\u8d58\u8ff0\uff0c\u6709\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u53c2\u8003 <\/span>OpenGL ES Pipeline<\/span><\/a><\/span><\/p>\n

\u6846\u67b6\u5c42\u7ea7<\/span><\/h1>\n

TGFX\u6846\u67b6\u5927\u81f4\u53ef\u5206\u4e3a\u4e09\u5927\u5757\uff1a<\/span><\/p>\n

1. Drawable\u4e0a\u4e0b\u6587\uff1a<\/span><\/strong><\/span>\u57fa\u4e8eEGL\u521b\u5efaOpenGL\u4e0a\u4e0b\u6587\uff0c\u63d0\u4f9b\u4e0e\u6e32\u67d3\u8bbe\u5907\u4ea4\u4e92\u7684\u80fd\u529b<\/span><\/p>\n

2. Canvas\u63a5\u53e3\uff1a<\/span><\/strong><\/span>\u5b9a\u4e49\u753b\u5e03Canvas\u53ca\u753b\u7b14Paint\uff0c\u5bf9\u5916\u63d0\u4f9b\u6e32\u67d3\u63a5\u53e3\u3001\u8bb0\u5f55\u6e32\u67d3\u72b6\u6001\u4ee5\u53ca\u521b\u5efa\u7ed8\u5236\u4efb\u52a1\u7b49<\/span><\/p>\n

3. DrawOp\u6267\u884c\uff1a<\/span><\/strong><\/span>\u5b9a\u4e49\u5e76\u88c5\u8f7d\u7740\u8272\u5668\u51fd\u6570\uff0c\u7ed1\u5b9a\u6570\u636e\u6e90\uff0c\u6267\u884c\u5b9e\u9645\u6e32\u67d3\u64cd\u4f5c<\/span><\/p>\n

\u4e3a\u4e86\u652f\u6301\u591a\u5e73\u53f0\uff0cTGFX\u5b9a\u4e49\u4e86\u4e00\u5957\u5b8c\u6574\u7684\u6846\u67b6\u57fa\u7c7b\uff0c\u5b9e\u73b0\u6846\u67b6\u4e0e\u5e73\u53f0\u7684\u7269\u7406\u9694\u79bb\uff0c\u6bd4\u5982\u77e9\u9635\u5bf9\u8c61Matrix\u3001\u5750\u6807Rect\u7b49\uff0c\u5e94\u7528\u4e0a\u5c42\u8d1f\u8d23\u5e73\u53f0\u5bf9\u8c61\u4e0eTFGX\u5bf9\u8c61\u7684\u6620\u5c04\u8f6c\u5316<\/span><\/p>\n

- (void)setMatrix:(CGAffineTransform)value {\r\n  pag::Matrix matrix = {};\r\n  matrix.setAffine(value.a, value.b, value.c, value.d, value.tx, value.ty);\r\n  _pagLayer->setMatrix(matrix);\r\n}<\/pre>\n
Drawable\u4e0a\u4e0b\u6587<\/span><\/h3>\n
PAG\u901a\u8fc7\u62bd\u8c61Drawable\u5bf9\u8c61\uff0c\u5c01\u88c5\u4e86\u7ed8\u5236\u6240\u9700\u7684\u4e0a\u4e0b\u6587\uff0c\u5176\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u5bf9\u8c61<\/span><\/p>\n
1. Device\uff08\u8bbe\u5907\uff09\uff1a<\/span><\/strong><\/span>\u4f5c\u4e3a\u786c\u4ef6\u8bbe\u5907\u5c42\uff0c\u8d1f\u8d23\u4e0e\u6e32\u67d3\u8bbe\u5907\u4ea4\u4e92\uff0c\u6bd4\u5982\u521b\u5efa\u7ef4\u62a4EAGLContext\u7b49<\/span><\/p>\n
2. Window\uff08\u7a97\u53e3\uff09\uff1a<\/span><\/strong><\/span>\u62e5\u6709\u4e00\u4e2aSurface\uff0c\u8d1f\u8d23\u56fe\u5f62\u5e93\u4e0e\u7ed8\u5236\u76ee\u6807\u7684\u7ed1\u5b9a\uff0c\u6bd4\u5982\u5c06OpenGL\u7684RenderBuffer\u7ed1\u5b9a\u5230CAEAGLLayer\u4e0a\uff1b<\/span><\/p>\n
3. Surface\uff08\u8868\u9762\uff09\uff1a<\/span><\/strong><\/span>\u521b\u5efacanvas\u753b\u5e03\u63d0\u4f9b\u53ef\u7ed8\u5236\u533a\u57df\uff0c\u5bf9\u5916\u63d0\u4f9bflush\u7ed8\u5236\u63a5\u53e3\uff1b\u5f53\u7a97\u53e3\u5c3a\u5bf8\u53d1\u751f\u53d8\u5316\u65f6\uff0csurface\u4f1a\u521b\u5efa\u65b0\u7684canvas<\/span><\/p>\n
4. Canvas\uff08\u753b\u5e03\uff09\uff1a<\/span><\/strong><\/span>\u4f5c\u4e3a\u5b9e\u9645\u53ef\u7ed8\u5236\u533a\u57df\uff0c\u63d0\u4f9b\u7ed8\u5236api\uff0c\u8fdb\u884c\u5b9e\u9645\u7684\u7ed8\u56fe\u64cd\u4f5c\uff0c\u6bd4\u5982\u7ed8\u5236\u4e00\u4e2aimage\u6216\u8005shape\u7b49<\/span><\/p>\n
<\/span><\/p>\n
\u8be6\u7ec6\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/p>\n
1\u3001Device\u521b\u5efaContext<\/span><\/h5>\n
std::shared_ptr<GLDevice> GLDevice::Make(void* sharedContext) {\r\n  if (eaglShareContext != nil) {\r\n    eaglContext = [[EAGLContext alloc] initWithAPI:[eaglShareContext API]\r\n                                        sharegroup:[eaglShareContext sharegroup]];\r\n  } else {\r\n    \/\/ \u521b\u5efaContext\r\n    eaglContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3];\r\n    if (eaglContext == nil) {\r\n      eaglContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];\r\n    }\r\n  }\r\n  auto device = EAGLDevice::Wrap(eaglContext, false);\r\n  return device;\r\n}\r\n\r\nstd::shared_ptr<EAGLDevice> EAGLDevice::Wrap(EAGLContext* eaglContext, bool isAdopted) {\r\n  auto oldEAGLContext = [[EAGLContext currentContext] retain];\r\n  if (oldEAGLContext != eaglContext) {\r\n    auto result = [EAGLContext setCurrentContext:eaglContext];\r\n    if (!result) {\r\n      return nullptr;\r\n    }\r\n  }\r\n  auto device = std::shared_ptr<EAGLDevice>(new EAGLDevice(eaglContext),\r\n                                            EAGLDevice::NotifyReferenceReachedZero);\r\n  if (oldEAGLContext != eaglContext) {\r\n    [EAGLContext setCurrentContext:oldEAGLContext];\r\n  }\r\n  return device;\r\n}\r\n\r\n\/\/ \u83b7\u53d6Context\r\nbool EAGLDevice::makeCurrent(bool force) {\r\n  oldContext = [[EAGLContext currentContext] retain];\r\n  if (oldContext == _eaglContext) {\r\n    return true;\r\n  }\r\n  if (![EAGLContext setCurrentContext:_eaglContext]) {\r\n    oldContext = nil;\r\n    return false;\r\n  }\r\n  return true;\r\n}<\/pre>\n
2\u3001Window\u521b\u5efaSurface\uff0c\u7ed1\u5b9aRenderBuffer<\/span><\/h5>\n
std::shared_ptr<Surface> EAGLWindow::onCreateSurface(Context* context) {\r\n  auto gl = GLFunctions::Get(context);\r\n  ...\r\n  gl->genFramebuffers(1, &frameBufferID);\r\n  gl->bindFramebuffer(GL_FRAMEBUFFER, frameBufferID);\r\n  gl->genRenderbuffers(1, &colorBuffer);\r\n  gl->bindRenderbuffer(GL_RENDERBUFFER, colorBuffer);\r\n  gl->framebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorBuffer);\r\n  auto eaglContext = static_cast<EAGLDevice*>(context->device())->eaglContext();\r\n  \/\/ \u7ed1\u5b9a\u5230CAEAGLLayer\u4e0a\r\n  [eaglContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];\r\n  ...\r\n  GLFrameBufferInfo glInfo = {};\r\n  glInfo.id = frameBufferID;\r\n  glInfo.format = GL_RGBA8;\r\n  BackendRenderTarget renderTarget = {glInfo, static_cast<int>(width), static_cast<int>(height)};\r\n  \/\/ \u521b\u5efaSurface\r\n  return Surface::MakeFrom(context, renderTarget, ImageOrigin::BottomLeft);\r\n}\r\n\r\n\/\/ \u901a\u8fc7renderTarget\u6301\u6709context\u3001frameBufferID\u53caSize\r\nstd::shared_ptr<Surface> Surface::MakeFrom(Context* context,\r\n                                           const BackendRenderTarget& renderTarget,\r\n                                           ImageOrigin origin, const SurfaceOptions* options) {\r\n  auto rt = RenderTarget::MakeFrom(context, renderTarget, origin);\r\n  return MakeFrom(std::move(rt), options);\r\n}<\/pre>\n
3\u3001Surface\u521b\u5efaCanvas\u53caflush\u7ed8\u5236<\/span><\/h5>\n
Canvas* Surface::getCanvas() {\r\n  \/\/ \u5c3a\u5bf8\u53d8\u5316\u65f6\u4f1a\u6e05\u7a7a\u5e76\u91cd\u65b0\u521b\u5efacanvas\r\n  if (canvas == nullptr) {\r\n    canvas = new Canvas(this);\r\n  }\r\n  return canvas;\r\n}\r\n\r\nbool Surface::flush(BackendSemaphore* signalSemaphore) {\r\n  auto semaphore = Semaphore::Wrap(signalSemaphore);\r\n  \/\/ drawingManager\u521b\u5efatasks\uff0c\u88c5\u8f7d\u7ed8\u5236pipiline\r\n  renderTarget->getContext()->drawingManager()->newTextureResolveRenderTask(this);\r\n  auto result = renderTarget->getContext()->drawingManager()->flush(semaphore.get());\r\n  return result;\r\n}<\/pre>\n
4\u3001\u6e32\u67d3\u6d41\u7a0b<\/span><\/h5>\n
bool PAGSurface::draw(RenderCache* cache, std::shared_ptr<Graphic> graphic,\r\n                      BackendSemaphore* signalSemaphore, bool autoClear) {\r\n  \/\/ \u83b7\u53d6context\u4e0a\u4e0b\u6587                    \r\n  auto context = lockContext(true);\r\n  \/\/ \u83b7\u53d6surface\r\n  auto surface = drawable->getSurface(context);\r\n  \/\/ \u901a\u8fc7canvas\u753b\u5e03\r\n  auto canvas = surface->getCanvas();\r\n  \/\/ \u6267\u884c\u5b9e\u9645\u7ed8\u5236\r\n  onDraw(graphic, surface, cache);\r\n  \/\/ \u8c03\u7528flush\r\n  surface->flush();\r\n  \/\/ glfinish\r\n  context->submit();\r\n  \/\/ \u7ed1\u5b9aGL_RENDERBUFFER\r\n  drawable->present(context);\r\n  \/\/ \u91ca\u653econtext\u4e0a\u4e0b\u6587\r\n  unlockContext();\r\n  return true;\r\n}<\/pre>\n
Canvas\u63a5\u53e3<\/span><\/h3>\n
Canvas API\u4e3b\u8981\u5305\u62ec\u753b\u5e03\u64cd\u4f5c\u53ca\u5bf9\u8c61\u7ed8\u5236\u4e24\u5927\u7c7b\uff1a<\/span><\/p>\n
\u753b\u5e03\u64cd\u4f5c\u5305\u62ecMatrix\u77e9\u9635\u53d8\u5316\u3001Blend\u878d\u5408\u6a21\u5f0f\u3001\u753b\u5e03\u88c1\u5207\u7b49\u8bbe\u7f6e\uff0c\u901a\u8fc7\u5bf9canvasState\u753b\u5e03\u72b6\u6001\u7684\u64cd\u4f5c\u5b9e\u73b0\u7ed8\u5236\u4e0a\u4e0b\u6587\u7684\u5207\u6362<\/p>\n
\u5bf9\u8c61\u7ed8\u5236<\/span><\/span>\u5305\u62ecPath\u3001Shape\u3001Image\u4ee5\u53caGlyph\u7b49\u5bf9\u8c61\u7684\u7ed8\u5236\uff0c\u7ed3\u5408Paint\u753b\u7b14\u5b9e\u73b0\u7eb9\u7406\u3001\u6587\u672c\u3001\u56fe\u5f62\u3001\u8499\u7248\u7b49\u591a\u79cd\u5f62\u5f0f\u7684\u7ed8\u5236\u53ca\u6e32\u67d3<\/span><\/p>\n
class Canvas {\r\n \t\/\/ \u753b\u5e03\u64cd\u4f5c\r\n  void setMatrix(const Matrix& matrix);\r\n  void setAlpha(float newAlpha);\r\n  void setBlendMode(BlendMode blendMode);\r\n\r\n  \/\/ \u7ed8\u5236API\r\n  void drawRect(const Rect& rect, const Paint& paint);\r\n  void drawPath(const Path& path, const Paint& paint);\r\n  void drawShape(std::shared_ptr<Shape> shape, const Paint& paint);\r\n  void drawImage(std::shared_ptr<Image> image, const Matrix& matrix, const Paint* paint = nullptr);\r\n  void drawGlyphs(const GlyphID glyphIDs[], const Point positions[], size_t glyphCount,\r\n                  const Font& font, const Paint& paint);\r\n};<\/pre>\n
\/\/ CanvasState\u8bb0\u5f55\u5f53\u524d\u753b\u5e03\u7684\u72b6\u6001\uff0c\u5305\u62ecAlph\u3001blend\u6a21\u5f0f\u3001\u53d8\u5316\u77e9\u9635\u7b49\r\nstruct CanvasState {\r\n  float alpha = 1.0f;\r\n  BlendMode blendMode = BlendMode::SrcOver;\r\n  Matrix matrix = Matrix::I();\r\n  Path clip = {};\r\n  uint32_t clipID = kDefaultClipID;\r\n};\r\n\r\n\/\/ \u901a\u8fc7save\u53carestore\u5b9e\u73b0\u7ed8\u5236\u72b6\u6001\u7684\u5207\u6362\r\nvoid Canvas::save() {\r\n  auto canvasState = std::make_shared<CanvasState>();\r\n  *canvasState = *state;\r\n  savedStateList.push_back(canvasState);\r\n}\r\n\r\nvoid Canvas::restore() {\r\n  if (savedStateList.empty()) {\r\n    return;\r\n  }\r\n  state = savedStateList.back();\r\n  savedStateList.pop_back();\r\n}<\/pre>\n
DrawOp\u6267\u884c<\/span><\/h3>\n
DrawOp\u8d1f\u8d23\u5b9e\u9645\u7684\u7ed8\u5236\u903b\u8f91\uff0c\u6bd4\u5982OpenGL\u7740\u8272\u5668\u51fd\u6570\u7684\u521b\u5efa\u88c5\u914d\u3001\u9876\u70b9\u53ca\u7eb9\u7406\u6570\u636e\u7684\u521b\u5efa\u53ca\u7ed1\u5b9a\u7b49<\/span><\/p>\n
TGFX\u62bd\u8c61\u4e86FillRectOp\u77e9\u5f62\u7ed8\u5236Op\uff0c\u53ef\u4ee5\u8986\u76d6\u7edd\u5927\u591a\u6570\u573a\u666f\u7684\u7ed8\u5236\u9700\u6c42<\/span><\/p>\n
\u5f53\u7136\uff0c\u5176\u8fd8\u652f\u6301\u5176\u5b83\u7c7b\u578b\u7684\u7ed8\u5236Op\uff0c\u6bd4\u5982ClearOp\u6e05\u5c4f\u3001TriangulatingPathOp\u4e09\u89d2\u56fe\u5f62\u7ed8\u5236Op\u7b49<\/span><\/p>\n
class DrawOp : public Op {\r\n  \/\/ DrawOp\u901a\u8fc7Pipiline\u5b9e\u73b0\u591a\u4e2a_colors\u7eb9\u7406\u5bf9\u8c61\u53ca_masks\u8499\u7248\u7684\u7ed8\u5236\r\n  std::vector<std::unique_ptr<FragmentProcessor>> _colors;\r\n  std::vector<std::unique_ptr<FragmentProcessor>> _masks;\r\n};\r\n\r\n\/\/ \u77e9\u5f62\u5b9e\u9645\u7ed8\u5236\u6267\u884c\u8005\r\nclass FillRectOp : public DrawOp {\r\n  FillRectOp(std::optional<Color> color, const Rect& rect, const Matrix& viewMatrix,\r\n             const Matrix& localMatrix);\r\n  void onPrepare(Gpu* gpu) override;\r\n  void onExecute(OpsRenderPass* opsRenderPass) override;\r\n};<\/pre>\n
\u603b\u7ed3<\/span><\/h1>\n
\u672c\u6587\u7ed3\u5408OpenGL\u8bb2\u89e3\u4e86TGFX\u6e32\u67d3\u5f15\u64ce\u7684\u5927\u6982\u6846\u67b6\u7ed3\u6784\uff0c\u8ba9\u5404\u4f4d\u6709\u4e86\u4e00\u4e2a\u521d\u6b65\u8ba4\u77e5<\/span><\/p>\n
\u63a5\u4e0b\u6765\u5c06\u7ed3\u5408image\u7eb9\u7406\u7ed8\u5236\u4ecb\u7ecdTGFX\u6e32\u67d3\u5f15\u64ce\u8be6\u7ec6\u7684\u7ed8\u5236\u6e32\u67d3\u6d41\u7a0b\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u70b9\u8d5e\uff01<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
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