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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/Managers.cpp
+18 -3
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@@ -6730,6 +6730,16 @@ namespace MobileGL::MG_Backend::DirectGLES {
? MG_State::pGLContext->GetPatchVertices()
: 3u;
m_passthroughTessControlPatchVertices = static_cast<Int>(patchVertices);
// PATCH_DEFAULT_{OUTER,INNER}_LEVEL are the same kind of dynamic state and are baked
// into the same stage (ES has no such state and no entry point to forward them to), so
// they are recorded and compared alongside the patch size - the two move together, as
// BuildPassthroughTessControlEssl's contract says.
m_passthroughTessControlOuterLevel = MG_State::pGLContext != nullptr
? MG_State::pGLContext->GetPatchDefaultOuterLevel()
: FloatVec4(1.0f, 1.0f, 1.0f, 1.0f);
m_passthroughTessControlInnerLevel = MG_State::pGLContext != nullptr
? MG_State::pGLContext->GetPatchDefaultInnerLevel()
: FloatVec2(1.0f, 1.0f);
if (tessEvalShaderIndex < 0 ||
static_cast<SizeT>(tessEvalShaderIndex) >= shaderSpirvs.size()) {
@@ -6770,8 +6780,10 @@ namespace MobileGL::MG_Backend::DirectGLES {
const String outMembers =
ExtractPerVertexBlockMembers(tessEvalStageEssl, /*input=*/true).value_or(String());
const String source =
BuildPassthroughTessControlEssl(ResolveBackendEsslVersion(), patchVertices, inMembers, outMembers);
const String source = BuildPassthroughTessControlEssl(ResolveBackendEsslVersion(), patchVertices,
inMembers, outMembers,
m_passthroughTessControlOuterLevel,
m_passthroughTessControlInnerLevel);
const GLuint backendShaderId = g_GLESFuncs.glCreateShader(GL_TESS_CONTROL_SHADER);
if (backendShaderId == 0) {
@@ -6861,8 +6873,11 @@ namespace MobileGL::MG_Backend::DirectGLES {
m_atomicCounterEsslBindingTop = AtomicCounterEsslBindingTop();
// Re-established by AttachPassthroughTessControlStage below when this program needs
// one; cleared first so a program that stops needing one (a relink that now attaches
// a real control stage) does not keep comparing against a stale patch size.
// a real control stage) does not keep comparing against a stale patch size. The
// default levels are re-established from the same call and gated on the same -1.
m_passthroughTessControlPatchVertices = -1;
m_passthroughTessControlOuterLevel = FloatVec4(1.0f, 1.0f, 1.0f, 1.0f);
m_passthroughTessControlInnerLevel = FloatVec2(1.0f, 1.0f);
// The same shape again for image FORMATS: what a format-less image declaration
// compiles to depends on live glBindImageTexture state, so the pairs it was built
// against are recorded here and compared per draw (ImageUnitFormatsStillMatch).