问题
I am having problems getting my GLSL shaders to work on both AMD and Nvidia hardware.
I am not looking for help fixing a particular shader, but how to generally avoid getting these problems. Is it possible to check if a shader will compile on AMD/Nvidia drivers without running the application on a machine with the respective hardware and actually trying it?
I know, in the end, testing is the only way to be sure, but during development I would like to at least avoid the obvious problems.
Everyone using GLSL must have these problems, so why can't I find a good way to fix them?
回答1:
Is it possible to check if a shader will compile on AMD/Nvidia drivers without running the application on a machine with the respective hardware and actually trying it?
No. If you are going to be serious about developing applications, testing on a variety of hardware is the only reliable way to go about it. And if you're not going to be serious, then who cares.
Generally speaking, the easiest way to handle this for a small team is to avoid the problem altogether. Most driver incompatibilities come from attempting to do something unorthodox: passing arrays as output/input varying variables, passing matrices as attributes, using more recent driver features, etc. So... don't do that. Use only solid, safe stuff that's been around in GLSL and has been almost certainly used in real-world OpenGL applications.
回答2:
using NVidias's NVEmulate and AMD's GPU ShaderAnalyzer could be an option.
AMD's GPU ShaderAnalyzer is a stand-alone GLSL/HLSL compiler. NVidias's NVEmulate is a tool to emulate the features of different (better) NVidia graphic cards in software. So if you have an NVidia card, you can simply run your program to test it (possibly emulating another NVidia card with the NVEmulate) and use the ShaderAnalyser to see if your shader compile on AMD cards.
If your shader runs on AMD, it will most probably run on NVidia. You can still test this with cgc (NVidias stand-alone Cg compiller, part of the Cg Toolkit) it compiles GLSL and Cg code to binary or cross-compile it to HLSL. This is the compiler which NVidia drivers use for GLSL anyway. The bonus is that you can also see the binary/assembly code of your shader, which is very helpful for low-level optimizations.
What no tool can tell you is, if the shader works (as expected) on different hardware.. I recently found out that some new AMD driver don't handle default uniform values properly... without a warning or error message... but this is a different story. So at some point you have to test your code on the target hardware.
来源：https://stackoverflow.com/questions/17688817/fixing-glsl-shaders-for-nvidia-and-amd