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Updated Cxbx Reloaded overview (markdown)

PatrickvL 2017-08-02 17:10:31 +02:00
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Cxbx-Reloaded-overview.md

@ -66,4 +66,9 @@ Since we emulate the GPU, we can access this memory solely in the CPU memory-map
Tiled memory is not yet fully researched for Cxbx-Reloaded. Currently, Cxbx-Reloaded just maps the same memory in use for 'Contiguous memory' towards the tiled memory region (0xF0000000 to 0xF4000000). _This is probably not sufficient and will need more research and emulation._
## JIT
**TODO**
**TODO**
## Rendering
Xbox renders using the Nvidia NV2A GPU. Most software written for the Xbox was developed with some version of the official "Xbox Development Kit" (XDK for short), which offered Direct3D 8 like features. Therefor, Cxbx-Reloaded uses Direct3D 8.1 as rendering API, although it's planned to port to Direct3D 9 (for HLE) and OpenGL (for LLE). Vulkan is currently not under consideration.
Some features the NV2A offered are not available on Direct3D 8 (not even on 9), so for those Cxbx-Reloaded tries to convert it to host-compatible rendering. For example, some texture-formats (like P8, R8B8 and others) are not available on host Direct3D, and are thus converted into ARGB (the most widely supported texture format). Vertex coordinates undergo a similair conversion.