gl::Error StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
{
unsigned int curBufferSize = getBufferSize();
unsigned int writePos = getWritePosition();
if (size > curBufferSize)
{
gl::Error error = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
if (error.isError())
{
return error;
}
setWritePosition(0);
}
else if (writePos + size > curBufferSize || writePos + size < writePos)
{
gl::Error error = discard();
if (error.isError())
{
return error;
}
setWritePosition(0);
}
return gl::Error(GL_NO_ERROR);
}
bool UserFile::seek(int64_t offset, int whence /* = SEEK_SET */) {
assert(seekable());
// Seek within m_buffer if we can, otherwise kill it and call user stream_seek / stream_tell
if (whence == SEEK_CUR &&
0 <= getReadPosition() + offset &&
getReadPosition() + offset < getWritePosition()) {
setReadPosition(getReadPosition() + offset);
setPosition(getPosition() + offset);
return true;
} else if (whence == SEEK_SET &&
0 <= offset - getPosition() + getReadPosition() &&
offset - getPosition() + getReadPosition() < getWritePosition()) {
setReadPosition(offset - getPosition() + getReadPosition());
setPosition(offset);
return true;
} else {
if (whence == SEEK_CUR) {
offset += getReadPosition() - getWritePosition();
}
setReadPosition(0);
setWritePosition(0);
}
// bool stream_seek($offset, $whence)
bool invoked = false;
bool sought = invoke(
m_StreamSeek, s_stream_seek, make_packed_array(offset, whence), invoked
).toBoolean();
if (!invoked) {
always_assert("No seek method? But I found one earlier?");
}
if (!sought) {
return false;
}
// int stream_tell()
Variant ret = invoke(m_StreamTell, s_stream_tell, Array::Create(), invoked);
if (!invoked) {
raise_warning("%s::stream_tell is not implemented!", m_cls->name()->data());
return false;
}
setPosition(ret.isInteger() ? ret.toInt64() : -1);
return true;
}
angle::Result StreamingIndexBufferInterface::reserveBufferSpace(const gl::Context *context,
unsigned int size,
gl::DrawElementsType indexType)
{
unsigned int curBufferSize = getBufferSize();
unsigned int writePos = getWritePosition();
if (size > curBufferSize)
{
ANGLE_TRY(setBufferSize(context, std::max(size, 2 * curBufferSize), indexType));
setWritePosition(0);
}
else if (writePos + size > curBufferSize || writePos + size < writePos)
{
ANGLE_TRY(discard(context));
setWritePosition(0);
}
return angle::Result::Continue;
}
bool StreamingVertexBufferInterface::reserveSpace(unsigned int size)
{
bool result = true;
unsigned int curBufferSize = getBufferSize();
if (size > curBufferSize)
{
result = setBufferSize(std::max(size, 3 * curBufferSize / 2));
setWritePosition(0);
}
else if (getWritePosition() + size > curBufferSize)
{
if (!discard())
{
return false;
}
setWritePosition(0);
}
return result;
}
bool StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
{
bool result = true;
unsigned int curBufferSize = getBufferSize();
unsigned int writePos = getWritePosition();
if (size > curBufferSize)
{
result = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
setWritePosition(0);
}
else if (writePos + size > curBufferSize || writePos + size < writePos)
{
if (!discard())
{
return false;
}
setWritePosition(0);
}
return result;
}
gl::Error StreamingVertexBufferInterface::reserveSpace(unsigned int size)
{
unsigned int curBufferSize = getBufferSize();
if (size > curBufferSize)
{
gl::Error error = setBufferSize(std::max(size, 3 * curBufferSize / 2));
if (error.isError())
{
return error;
}
setWritePosition(0);
}
else if (getWritePosition() + size > curBufferSize)
{
gl::Error error = discard();
if (error.isError())
{
return error;
}
setWritePosition(0);
}
return gl::Error(GL_NO_ERROR);
}
int StaticVertexBufferInterface::storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count, GLsizei instances)
{
int attributeOffset = attrib.mOffset % attrib.stride();
VertexElement element = { attrib.mType, attrib.mSize, attrib.stride(), attrib.mNormalized, attributeOffset, getWritePosition() };
mCache.push_back(element);
return VertexBufferInterface::storeVertexAttributes(attrib, start, count, instances);
}
