98eda99ab8
GL_MAP_INVALIDATE_BUFFER_BIT cannot be treated as
GL_MAP_INVALIDATE_RANGE_BIT naively. When we run into
ptr = glMapBufferRange(buf, 0, size,
GL_WRITE_BIT|GL_MAP_INVALIDATE_BUFFER_BIT);
memcpy(ptr, data1, size);
glUnmapBuffer(buf);
ptr = glMapBufferRange(buf, size, size,
GL_WRITE_BIT|GL_MAP_UNSYNCHRONIZED_BIT);
memcpy(ptr, data2, size);
glUnmapBuffer(buf);
we never want data1 to be copy_transfer'ed. Because that would mean
that data2 might overwrite valid data.
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Alexandros Frantzis alexandros.frantzis@collabora.com
Fixes: a22c5df079 ("virgl: Use buffer copy transfers to avoid waiting when mapping")
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
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