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[Feat] (DirectGLES, Config, ShaderTranspiler): route gl_ViewportIndex on Espryt by replaying a draw per distinct viewport state

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swung0x48
2026-08-21 22:08:25 -04:00
parent ece9491d4b
commit 908172ba0f
8 changed files with 612 additions and 54 deletions
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MobileGL/MG_Util/ShaderTranspiler/TranslationCache.cpp
+1 -1
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@@ -169,7 +169,7 @@ namespace MobileGL::MG_Util::ShaderTranspiler {
TranslationKeyBuilder builder;
AppendCommonKeyPrefix(builder, kEsslKeyTag);
builder.Value(static_cast<Uint32>(inputs.shaderType));
builder.Value(static_cast<Uint8>(inputs.supportsViewportArray));
builder.Value(static_cast<Uint8>(inputs.viewportIndexLoweringArmed));
builder.Value(static_cast<Uint8>(inputs.supportsNoperspectiveInterpolation));
builder.Value(static_cast<Uint8>(inputs.supportsExtendedImageFormats));
builder.Value(inputs.maxColorTextureSamples);
MobileGL/MG_Util/ShaderTranspiler/TranslationCache.h
+9 -3
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@@ -556,7 +556,8 @@ namespace MobileGL::MG_Util::ShaderTranspiler {
// * the GL stage enum - three passes are stage-gated (draw parameters and
// array vertex inputs on vertex, fragment-output index legalization on
// fragment);
// * SupportsViewportArray - arms LowerViewportIndexForEssl;
// * the viewport-index lowering arming bit - GL_OES_viewport_array's absence OR the
// routing emulation being on - which arms LowerViewportIndexForEssl;
// * the four sample ceilings (color / integer / depth / advertised) - both
// ARM ClampMultisampleFetchesForEssl and PARAMETERIZE it;
// * SupportsNoperspectiveInterpolation - arms EmulateNoPerspectiveForEssl;
@@ -583,7 +584,7 @@ namespace MobileGL::MG_Util::ShaderTranspiler {
// armed by nothing, so the SPIR-V already in this key covers them completely.
//
// THE TEST FOR THAT CLAIM IS NOT THE SIGNATURE. LowerViewportIndexForEssl is equally
// module-only to look at, yet SupportsViewportArray is in this key because that bit ARMS
// module-only to look at, yet the arming bit is in this key because it ARMS
// it at the call site. So a new pass needs BOTH checks - what it takes, and what decides
// whether it runs - before "no key material" is a conclusion rather than an assumption.
// Note also where an application-authored value can hide: the atomic-counter
@@ -612,7 +613,12 @@ namespace MobileGL::MG_Util::ShaderTranspiler {
GLenum shaderType = 0;
// --- driver capability bits that arm or steer a pass ---
Bool supportsViewportArray = false;
// Whether LowerViewportIndexForEssl runs on this module. NOT the raw
// GL_OES_viewport_array bit any more: the routing emulation arms the pass even where the
// extension exists (Config.h, ViewportArrayEmulation), so the extension alone no longer
// decides, and a key carrying only it would serve a module lowered under one setting to a
// link made under the other.
Bool viewportIndexLoweringArmed = false;
Bool supportsNoperspectiveInterpolation = false;
// GL_NV_image_formats. Arms WidenImageFormatsForEssl, which re-declares every storage
// image whose format GLSL ES core cannot spell in the core format that carries it and