The previous texture_memory_alloc.hpp was written based on an
incorrect understanding of the "32-bit" and "64-bit" texture memory
address mapping.
The primary motivation is to rearrange the texture memory address map
so that "textures" (64-bit access) do not overlap with 32-bit
accesses, such as REGION_BASE or PARAM_BASE.
Also adds the incomplete modifier_volume example.
This also adds vec2 for UV coordinates, and obj_to_cpp has been
modified to parse vertex texture coordinates from obj files.
On an emulator, the receive buffer is filled with the correct/expected
data for 'device status'.
I found this experiment useful:
- it revealed a bug in my register struct generator code (the
maple_if-related registers were not at the correct offsets)
- it validates my understanding about endianness-swapping between the
maple bus and the SH4
