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[Feat] (Tessellation): implement glPatchParameterfv and bake the default levels into both pass-through control stages

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Swung0x48
2026-08-27 02:11:19 -04:00
parent 0f2fcbc469
commit d5286e69b6
21 changed files with 546 additions and 64 deletions
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MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp
+12 -2
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@@ -2461,9 +2461,19 @@ namespace MobileGL::MG_Backend::DirectGLES {
// `layout(vertices = N) out` - so a glPatchParameteri between two draws makes the
// built program wrong. -1 is "this program needed no such stage", which compares
// equal to itself and costs every other program one integer test.
//
// GL_PATCH_DEFAULT_{OUTER,INNER}_LEVEL are baked into the same stage for the same
// reason (ES has neither the state nor an entry point), so glPatchParameterfv
// makes it stale too. Both level comparisons sit INSIDE the >= 0 guard: a program
// with a control stage of its own - which is nearly all of them - still pays only
// the one integer test.
(twin->GetPassthroughTessControlPatchVertices() >= 0 &&
twin->GetPassthroughTessControlPatchVertices() !=
static_cast<Int>(MG_State::pGLContext->GetPatchVertices()))) {
(twin->GetPassthroughTessControlPatchVertices() !=
static_cast<Int>(MG_State::pGLContext->GetPatchVertices()) ||
twin->GetPassthroughTessControlOuterLevel() !=
MG_State::pGLContext->GetPatchDefaultOuterLevel() ||
twin->GetPassthroughTessControlInnerLevel() !=
MG_State::pGLContext->GetPatchDefaultInnerLevel()))) {
twin->SyncToBackend(currentProgram);
}
g_currentDrawFrontendProgram = currentProgram.get();