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[Fix] (Tessellation): compare the default patch levels by bit pattern, so a NaN level stops re-linking the program on every draw

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Swung0x48
2026-08-27 03:18:13 -04:00
parent e3163233a5
commit 2635fe84b6
2 changed files with 19 additions and 2 deletions
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MobileGL/MG_State/GLState/RenderState/RenderState.cpp
+7 -2
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@@ -220,8 +220,13 @@ namespace MobileGL {
// BumpVersions(), not just ++m_version, for the same reason SetPatchVertices does it:
// these levels are compiled INTO the synthesized pass-through tessellation control
// stage on both backends, so changing one makes an already-built program stale.
//
// The redundant-write guard compares BIT PATTERNS, not floats: glPatchParameterfv
// accepts NaN, and a float compare would let a re-set of the identical NaN tuple fall
// through and bump the pipeline-state version - invalidating DirectVulkan's pipeline
// memo and DirectGLES's render-state span - on every single call.
void RenderState::SetPatchDefaultOuterLevel(const FloatVec4& levels) {
if (m_parameters.PatchDefaultOuterLevel == levels) return;
if (BitwiseEqual(m_parameters.PatchDefaultOuterLevel, levels)) return;
m_parameters.PatchDefaultOuterLevel = levels;
BumpVersions();
@@ -232,7 +237,7 @@ namespace MobileGL {
}
void RenderState::SetPatchDefaultInnerLevel(const FloatVec2& levels) {
if (m_parameters.PatchDefaultInnerLevel == levels) return;
if (BitwiseEqual(m_parameters.PatchDefaultInnerLevel, levels)) return;
m_parameters.PatchDefaultInnerLevel = levels;
BumpVersions();