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[Fix, Test] (MG_Backend/DirectGLES, MG_Util, CI): keep an explicit LOD constant under a new avoid flag - folding the bias uniform into it kills the ANGLE llvmpipe JIT

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This commit is contained in:
swung0x48
2026-08-12 01:42:55 -04:00
parent b5e9339c66
commit 205d837942
16 changed files with 72 additions and 5 deletions
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MobileGL/MG_Backend/DirectGLES/Managers.cpp
+7 -1
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@@ -55,6 +55,12 @@ namespace MobileGL::MG_Backend::DirectGLES {
return g_GLESCapabilities.AvoidSamplerMipmapMinFilter;
}
static Bool ShouldAvoidExplicitLodBiasOnAngleLlvmpipe() {
// IsAngleLlvmpipeRenderer combined with the MOBILEGL_AVOID_EXPLICIT_LOD_BIAS
// feature toggle, both resolved in FillInGLESCapabilities.
return g_GLESCapabilities.AvoidExplicitLodBias;
}
static GLenum ResolveBackendMinFilter(const SamplerParameters& samplerParams,
Bool avoidMipmapMinFilter) {
GLenum filter = MG_Util::ConvertSamplerFilterModeToGLEnum(samplerParams.minFilter,
@@ -4466,7 +4472,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
source = ProcessOutColorLocations(source);
source = ForceFlatIntegerVaryings(source, glShaderType);
source = BroadcastLegacyFragColor(std::move(source), glShaderType, m_fragColorBroadcastCount);
source = EmulateTextureLodBias(source);
source = EmulateTextureLodBias(source, ShouldAvoidExplicitLodBiasOnAngleLlvmpipe());
source = EmulateBaseInstanceInVertexShader(std::move(source), glShaderType);
source = PromoteDrawParameterGlobalsToUniforms(std::move(source), glShaderType);
source = ForceSupporterOutput(source);
MobileGL/MG_Backend/DirectGLES/Utils.cpp
+6 -1
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@@ -957,7 +957,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
}
} // namespace
String EmulateTextureLodBias(const String& glslCode) {
String EmulateTextureLodBias(const String& glslCode, Bool avoidExplicitLodBias) {
#ifdef TRACY_ENABLE
ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
#endif
@@ -1018,6 +1018,11 @@ namespace MobileGL::MG_Backend::DirectGLES {
if (samplerIt == samplerNames.end()) continue;
const String& biasName = samplerIt->second;
if (form->explicitLodArg >= 0 && avoidExplicitLodBias) {
// The lookup already names its level; leaving it alone keeps a constant
// LOD constant. Costs the bias on explicit-LOD lookups only.
continue;
}
if (form->explicitLodArg >= 0) {
// Explicit LOD: the bias adds to it, as Vulkan does for
// OpImageSampleExplicitLod and as the CTS reference expects.
MobileGL/MG_Backend/DirectGLES/Utils.h
+6 -1
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@@ -183,7 +183,12 @@ namespace MobileGL::MG_Backend::DirectGLES {
// the bound texture's (or sampler object's) value into it; a shader whose samplers
// all have a zero bias is therefore unaffected. Returns the source unchanged when
// there is nothing to rewrite.
String EmulateTextureLodBias(const String& glslCode);
//
// avoidExplicitLodBias leaves lookups that already carry an explicit LOD untouched,
// so their constant level stays constant; only the implicit-LOD forms take the bias.
// Off by default and only ever set on ANGLE + llvmpipe, where injecting the uniform
// into a constant LOD crashes the driver (MOBILEGL_AVOID_EXPLICIT_LOD_BIAS).
String EmulateTextureLodBias(const String& glslCode, Bool avoidExplicitLodBias = false);
} // namespace PrgramImpl
namespace Utils {