> How difficult is it to convert existing CG or GLSL based shaders (RetroArch) to BGFX
> format?
It depends. If you pull the MAME source code off of Github and look in src/osd/modules/render/bgfx/shaders, you can see what a number of converted shaders from RetroArch look like.
At build time, the BGFX shaders are converted to either GLSL, GLES-compliant GLSL, or HLSL, and then compiled into binaries. As a result of supporting GLES, the shaders supplied to BGFX must meet a handful of requirements, which can make converting shaders a bit of a pain, requiring manual rather than automatic conversion:
- No implicit conversion between scalar and vector types.
- No implicit conversion between boolean and float types.
- No uniforms other than vec4.
- Most syntax favors GLSL tokens over HLSL tokens: vec4 instead of float4, mix instead of lerp, and so on.
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Re: Converting CG and GLSL shader types to BGFX??
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Re: Converting CG and GLSL shader types to BGFX??
