Crashes and bugs and unexpected results #29
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Thx for the testing ! |
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After several bugfix, most of the shader will not crash segfault any more, but some of the instructions still work different with GPU, and performance is still very slow, I'm going to reimplement the interpreter with SIMD support and maybe enable JIT/AOT support using llvm. Test result update : |
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I have this repo https://github.com/danilw/GPU-my-list-of-bugs
In this my "List of shader bugs" some shaders with UB and other "edge-cases".
I tested shaders from this my lit with this project spvm.
Using
spvm_shadertoyof this project to test.To test with llvmpipe I use https://github.com/danilw/vulkan-shadertoy-launcher GPU detected as
Vulkan GPU - CPU: llvmpipe (LLVM 14.0.4, 256 bits) (id: 0x0000) from vendor 0x10005 [driver version: 0x0001, API version: 0x4030D3](I list only "broken" results, correct not listed)
(multi-channel shaders not tested, just few where I copy Buf code as Image shader code)
texturefunction from codetexturefunction from codetexturefunction from code (use BufA as Image shader)More:
https://github.com/danilw/card-game-GLSL
Using
original_bufA.glslas Image shader (rename iChannel3 to iChannel0 forspvm_shadertoy). Expected result - background should be rendered. llvmpipe(CPU) result - render single frame after 1 min of "loading shader". spvm result - crash segfault.Using
unrolled_bufA.glslas Image shader (same rename). llvmpipe result - render single frame after 1 min of "loading shader". spvm result - crash segfault.My public shaders:
#define iTime 2.0and#define iMouse vec4(0.)Surprisingly, this shader https://www.shadertoy.com/view/Nt2Szm works in spvm when it complex enough.
And this same shader GLES2 port https://www.shadertoy.com/view/fdc3Dn works in spvm. (1 frame per min)
When this same shader unrolled version https://www.shadertoy.com/view/sdcGDr - does not work in spvm. spvm result - crash segfault. llvmpipe(CPU) result - works as expected.
I made this "test" just for fun, idk if it can be considered "useful".
Result is - most of my shaders dont work with spvm.
llvmpipe is still best option to launch your shaders on CPU.
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