kc3-lang/angle/src/libANGLE/Context.inl.h

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• Hash : c37b1ef8
  Author :
  Date : 2021-05-13T14:31:59
  

  Balance debuglabel begin/end pairs for skipped drawcalls
  
  Some drawcalls may be no-op'd due to shader issues or having
  zero instance or element counts. In these cases, the ANGLE markers
  used for AGI will become imbalanced as it is the drawcalls that
  trigger the 'begin' marker. This patch ensures that the dirty-bit
  draw event handler is called for no-op'd drawcalls to keep the
  AGI commandTree in balance.
  
  Bug: b/184888395
  Change-Id: I1041d2f06fb313934365340c35e458bc5a66ba64
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2895330
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  Reviewed-by: Ian Elliott <ianelliott@google.com>
  Commit-Queue: Ian Elliott <ianelliott@google.com>
  

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• src/libANGLE/Context.inl.h

• //
  // Copyright 2018 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // Context.inl.h: Defines inline functions of gl::Context class
  // Has to be included after libANGLE/Context.h when using one
  // of the defined functions
  
  #ifndef LIBANGLE_CONTEXT_INL_H_
  #define LIBANGLE_CONTEXT_INL_H_
  
  #include "libANGLE/GLES1Renderer.h"
  #include "libANGLE/renderer/ContextImpl.h"
  
  #define ANGLE_HANDLE_ERR(X) \
      (void)(X);              \
      return;
  #define ANGLE_CONTEXT_TRY(EXPR) ANGLE_TRY_TEMPLATE(EXPR, ANGLE_HANDLE_ERR)
  
  namespace gl
  {
  constexpr angle::PackedEnumMap<PrimitiveMode, GLsizei> kMinimumPrimitiveCounts = {{
      {PrimitiveMode::Points, 1},
      {PrimitiveMode::Lines, 2},
      {PrimitiveMode::LineLoop, 2},
      {PrimitiveMode::LineStrip, 2},
      {PrimitiveMode::Triangles, 3},
      {PrimitiveMode::TriangleStrip, 3},
      {PrimitiveMode::TriangleFan, 3},
      {PrimitiveMode::LinesAdjacency, 2},
      {PrimitiveMode::LineStripAdjacency, 2},
      {PrimitiveMode::TrianglesAdjacency, 3},
      {PrimitiveMode::TriangleStripAdjacency, 3},
  }};
  
  ANGLE_INLINE void MarkTransformFeedbackBufferUsage(const Context *context,
                                                     GLsizei count,
                                                     GLsizei instanceCount)
  {
      if (context->getStateCache().isTransformFeedbackActiveUnpaused())
      {
          TransformFeedback *transformFeedback = context->getState().getCurrentTransformFeedback();
          transformFeedback->onVerticesDrawn(context, count, instanceCount);
      }
  }
  
  ANGLE_INLINE void MarkShaderStorageUsage(const Context *context)
  {
      for (size_t index : context->getStateCache().getActiveShaderStorageBufferIndices())
      {
          Buffer *buffer = context->getState().getIndexedShaderStorageBuffer(index).get();
          if (buffer)
          {
              buffer->onDataChanged();
          }
      }
  
      for (size_t index : context->getStateCache().getActiveImageUnitIndices())
      {
          const ImageUnit &imageUnit = context->getState().getImageUnit(index);
          const Texture *texture     = imageUnit.texture.get();
          if (texture)
          {
              texture->onStateChange(angle::SubjectMessage::ContentsChanged);
          }
      }
  }
  
  // Return true if the draw is a no-op, else return false.
  //  If there is no active program for the vertex or fragment shader stages, the results of vertex
  //  and fragment shader execution will respectively be undefined. However, this is not
  //  an error. ANGLE will treat this as a no-op.
  //  A no-op draw occurs if the count of vertices is less than the minimum required to
  //  have a valid primitive for this mode (0 for points, 0-1 for lines, 0-2 for tris).
  ANGLE_INLINE bool Context::noopDraw(PrimitiveMode mode, GLsizei count) const
  {
      if (!mStateCache.getCanDraw())
      {
          return true;
      }
  
      return count < kMinimumPrimitiveCounts[mode];
  }
  
  ANGLE_INLINE angle::Result Context::syncDirtyBits()
  {
      const State::DirtyBits &dirtyBits = mState.getDirtyBits();
      ANGLE_TRY(mImplementation->syncState(this, dirtyBits, mAllDirtyBits));
      mState.clearDirtyBits();
      return angle::Result::Continue;
  }
  
  ANGLE_INLINE angle::Result Context::syncDirtyBits(const State::DirtyBits &bitMask)
  {
      const State::DirtyBits &dirtyBits = (mState.getDirtyBits() & bitMask);
      ANGLE_TRY(mImplementation->syncState(this, dirtyBits, bitMask));
      mState.clearDirtyBits(dirtyBits);
      return angle::Result::Continue;
  }
  
  ANGLE_INLINE angle::Result Context::syncDirtyObjects(const State::DirtyObjects &objectMask,
                                                       Command command)
  {
      return mState.syncDirtyObjects(this, objectMask, command);
  }
  
  ANGLE_INLINE angle::Result Context::prepareForDraw(PrimitiveMode mode)
  {
      if (mGLES1Renderer)
      {
          ANGLE_TRY(mGLES1Renderer->prepareForDraw(mode, this, &mState));
      }
  
      ANGLE_TRY(syncDirtyObjects(mDrawDirtyObjects, Command::Draw));
      ASSERT(!isRobustResourceInitEnabled() ||
             !mState.getDrawFramebuffer()->hasResourceThatNeedsInit());
      return syncDirtyBits();
  }
  
  ANGLE_INLINE void Context::drawArrays(PrimitiveMode mode, GLint first, GLsizei count)
  {
      // No-op if count draws no primitives for given mode
      if (noopDraw(mode, count))
      {
          ANGLE_CONTEXT_TRY(mImplementation->handleNoopDrawEvent());
          return;
      }
  
      ANGLE_CONTEXT_TRY(prepareForDraw(mode));
      ANGLE_CONTEXT_TRY(mImplementation->drawArrays(this, mode, first, count));
      MarkTransformFeedbackBufferUsage(this, count, 1);
  }
  
  ANGLE_INLINE void Context::drawElements(PrimitiveMode mode,
                                          GLsizei count,
                                          DrawElementsType type,
                                          const void *indices)
  {
      // No-op if count draws no primitives for given mode
      if (noopDraw(mode, count))
      {
          ANGLE_CONTEXT_TRY(mImplementation->handleNoopDrawEvent());
          return;
      }
  
      ANGLE_CONTEXT_TRY(prepareForDraw(mode));
      ANGLE_CONTEXT_TRY(mImplementation->drawElements(this, mode, count, type, indices));
  }
  
  ANGLE_INLINE void StateCache::onBufferBindingChange(Context *context)
  {
      updateBasicDrawStatesError();
      updateBasicDrawElementsError();
  }
  
  ANGLE_INLINE void Context::bindBuffer(BufferBinding target, BufferID buffer)
  {
      Buffer *bufferObject =
          mState.mBufferManager->checkBufferAllocation(mImplementation.get(), buffer);
      mState.setBufferBinding(this, target, bufferObject);
      mStateCache.onBufferBindingChange(this);
  }
  
  }  // namespace gl
  
  #endif  // LIBANGLE_CONTEXT_INL_H_
  

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