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[Feat] (ShaderTranspiler, DirectGLES): emulate noperspective on GLES devices lacking GL_NV_shader_noperspective_interpolation - EmulateNoPerspectivePass pre-multiplies each NoPerspective output by gl_Position.w in the vertex stage and recovers each input via gl_FragCoord.w in the fragment stage (exact screen-linear L = P(a*w)*gl_FragCoord.w, handling whole-variable and component/access-chain reads, scalar and vector varyings), forces highp on emulated varyings, and strips what it cannot emulate; replaces the smooth-strip fallback so no NV extension is ever required. Restricts the vertex pre-multiply to the entry function so a non-inlined helper cannot double-scale

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swung0x48
2026-07-20 23:48:48 -04:00
parent 202037b5a3
commit 79feeffd25
7 changed files with 652 additions and 5 deletions
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MobileGL/MG_Backend/DirectGLES/Managers.cpp
+6 -5
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@@ -2792,13 +2792,14 @@ namespace MobileGL::MG_Backend::DirectGLES {
// noperspective is core desktop GLSL and reaches here as the SPIR-V NoPerspective
// decoration. SPIRV-Cross renders it as ESSL `noperspective` + `#extension
// GL_NV_shader_noperspective_interpolation : require`; on a driver without that
// extension the require fails, so strip the decoration first and let the varying
// fall back to smooth interpolation. Devices that have the extension keep the
// decoration and get true screen-linear interpolation.
// GL_NV_shader_noperspective_interpolation : require`; a driver without that extension
// rejects the require. So on such devices emulate screen-linear interpolation instead
// (pre-multiply outputs by gl_Position.w, recover inputs via gl_FragCoord.w) and drop
// the decoration - exact, extension-free. Devices that have the extension keep the
// decoration and let the hardware do it natively.
Vector<unsigned int> noperspectiveSpirv;
if (!g_GLESCapabilities.SupportsNoperspectiveInterpolation &&
MG_Util::ShaderTranspiler::ShaderCompiler::StripNoPerspectiveForEssl(
MG_Util::ShaderTranspiler::ShaderCompiler::EmulateNoPerspectiveForEssl(
*effectiveSpirv, noperspectiveSpirv) &&
!noperspectiveSpirv.empty()) {
effectiveSpirv = &noperspectiveSpirv;