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

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• Hash : f1150231
  Author :
  Date : 2024-01-16T16:28:36
  

  Track WebGL buffer type in gl::Buffer state.
  
  WebGL has special validation that disallows buffers from changing
  "WebGL buffer type". Once a buffer is marked as having index data it
  cannot be bound as any other type of buffer except the copy binding
  points to copy to other index buffers. This disallows any GPU writes
  to buffers used for index data.
  
  Use this rule to shadow index buffer data when the driver is unable
  to give us robust access. Index range computation can be done much
  faster when the buffer does not need to be read back.
  
  Bug: angleproject:8434
  Change-Id: I059eff732bb2f43234f61d9ef5528289f7698b38
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5200242
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  

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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/Context.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
  {
      // Make sure any pending link is done before checking whether draw is allowed.
      mState.ensureNoPendingLink(this);
  
      if (!mStateCache.getCanDraw())
      {
          return true;
      }
  
      return count < kMinimumPrimitiveCounts[mode];
  }
  
  ANGLE_INLINE bool Context::noopMultiDraw(GLsizei drawcount) const
  {
      return drawcount == 0 || !mStateCache.getCanDraw();
  }
  
  ANGLE_INLINE angle::Result Context::syncAllDirtyBits(Command command)
  {
      constexpr state::DirtyBits kAllDirtyBits                 = state::DirtyBits().set();
      constexpr state::ExtendedDirtyBits kAllExtendedDirtyBits = state::ExtendedDirtyBits().set();
      const state::DirtyBits dirtyBits                         = mState.getDirtyBits();
      const state::ExtendedDirtyBits extendedDirtyBits         = mState.getExtendedDirtyBits();
      ANGLE_TRY(mImplementation->syncState(this, dirtyBits, kAllDirtyBits, extendedDirtyBits,
                                           kAllExtendedDirtyBits, command));
      mState.clearDirtyBits();
      mState.clearExtendedDirtyBits();
      return angle::Result::Continue;
  }
  
  ANGLE_INLINE angle::Result Context::syncDirtyBits(const state::DirtyBits bitMask,
                                                    const state::ExtendedDirtyBits extendedBitMask,
                                                    Command command)
  {
      const state::DirtyBits dirtyBits = (mState.getDirtyBits() & bitMask);
      const state::ExtendedDirtyBits extendedDirtyBits =
          (mState.getExtendedDirtyBits() & extendedBitMask);
      ANGLE_TRY(mImplementation->syncState(this, dirtyBits, bitMask, extendedDirtyBits,
                                           extendedBitMask, command));
      mState.clearDirtyBits(dirtyBits);
      mState.clearExtendedDirtyBits(extendedDirtyBits);
      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, getMutableGLES1State()));
      }
  
      ANGLE_TRY(syncDirtyObjects(mDrawDirtyObjects, Command::Draw));
      ASSERT(!isRobustResourceInitEnabled() ||
             !mState.getDrawFramebuffer()->hasResourceThatNeedsInit());
      return syncAllDirtyBits(Command::Draw);
  }
  
  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);
  
      // Early return if rebinding the same buffer
      if (bufferObject == mState.getTargetBuffer(target))
      {
          return;
      }
  
      mState.setBufferBinding(this, target, bufferObject);
      mStateCache.onBufferBindingChange(this);
  
      if (bufferObject)
      {
          bufferObject->onBind(this, target);
      }
  }
  
  }  // namespace gl
  
  #endif  // LIBANGLE_CONTEXT_INL_H_
  

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