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Henrik RydgårdandClaude Opus 5.5
ae68a7e73f
The crosshair turns red, and lock-on works, when stencil bit 3 is set at the centre of the frame, which the game tests by reading the pixel from VRAM with the CPU (#17936). Hook that and read back the stencil of that row into the alpha bytes in RAM. The alpha the hardware backends keep doesn't follow stencil everywhere, so reading color isn't enough. Adds PerformReadbackStencilToMemory for this (8888 only for now). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
To get to 100% compatibility, we will need a software renderer as there are games out there that do tricks that can't really be faked in a sensible way. Useful for homebrew too that mix sw and accel rendering.