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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_Util/ShaderTranspiler/ShaderCompiler.h
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@@ -38,6 +38,11 @@ namespace MobileGL {
// (SPIRV-Cross would otherwise require that extension and the driver would reject it).
static bool StripNoPerspectiveForEssl(const Vector<Uint32>& inputBinary,
Vector<uint32_t>& outputBinary);
// Emulates noperspective (screen-linear) interpolation via gl_Position.w / gl_FragCoord.w
// so no NV extension is needed; strips what it cannot emulate. DirectGLES fallback for
// devices lacking GL_NV_shader_noperspective_interpolation. See EmulateNoPerspectivePass.
static bool EmulateNoPerspectiveForEssl(const Vector<Uint32>& inputBinary,
Vector<uint32_t>& outputBinary);
// Rebases loads of the InstanceIndex builtin to (InstanceIndex - BaseInstance) so
// shaders see GL's zero-based gl_InstanceID. Vertex shaders only; DirectVulkan
// backend only (glslang's relaxed mode aliases gl_InstanceID to gl_InstanceIndex,