void TransformFeedbackGL::bindIndexedBuffer(size_t index, const OffsetBindingPointer<gl::Buffer> &binding)
{
// Directly bind buffer (not through the StateManager methods) because the buffer bindings are
// tracked per transform feedback object
mStateManager->bindTransformFeedback(GL_TRANSFORM_FEEDBACK, mTransformFeedbackID);
if (binding.get() != nullptr)
{
const BufferGL *bufferGL = GetImplAs<BufferGL>(binding.get());
if (binding.getSize() != 0)
{
mFunctions->bindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<GLuint>(index),
bufferGL->getBufferID(), binding.getOffset(),
binding.getSize());
}
else
{
mFunctions->bindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<GLuint>(index),
bufferGL->getBufferID());
}
}
else
{
mFunctions->bindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<GLuint>(index), 0);
}
}
GLsizeiptr GetBoundBufferAvailableSize(const OffsetBindingPointer<Buffer> &binding)
{
Buffer *buffer = binding.get();
if (buffer)
{
if (binding.getSize() == 0)
return static_cast<GLsizeiptr>(buffer->getSize());
angle::CheckedNumeric<GLintptr> offset = binding.getOffset();
angle::CheckedNumeric<GLsizeiptr> size = binding.getSize();
angle::CheckedNumeric<GLsizeiptr> bufferSize = buffer->getSize();
auto end = offset + size;
auto clampedSize = size;
auto difference = end - bufferSize;
if (!difference.IsValid())
{
return 0;
}
if (difference.ValueOrDie() > 0)
{
clampedSize = size - difference;
}
return clampedSize.ValueOrDefault(0);
}
else
{
return 0;
}
}
