[Fix] (MG_Util/ShaderTranspiler, MG_State, MG_Impl/GLImpl, MG_Backend/DirectGLES): GL CTS uniform_block - coerce packed/shared block layouts to std140 at source preprocess (glslang rejects them when targeting SPIR-V; std140 is the only UBO layout the pipeline emits), GL-style block reflection (array "[0]" names, per-element struct-array expansion, unused members and declared-but-unread blocks stay active), vec4-padded GL_UNIFORM_BLOCK_DATA_SIZE, std140 array strides for struct-nested arrays (glslang reflects tight strides there), arrayed-block instances share the first instance member set, glDeleteShader-flagged names stay usable while attached, and backend ESSL emits against highp default precision so relaxed block members match across stages (KHR-GL33.shaders.uniform_block on llvmpipe: 659 Fail -> 828/828 Pass)

MobileGL/MG_State/GLState/Core.h

@@ -116,6 +116,9 @@ namespace MobileGL {
                 Uint CreateShader(ShaderStage stage);
                 void MarkProgramForDeletion(Uint index);
                 void MarkShaderForDeletion(Uint index);
+                // Frees a deletion-flagged shader's name once it lost its last GL-visible
+                // attachment (call after glDetachShader).
+                void ReleaseShaderNameIfOrphaned(Uint index);
                 Bool ValidateProgramName(Uint index) const;
                 Bool ValidateShaderName(Uint index) const;
                 const SharedPtr<ProgramObject>& GetProgramObject(Uint index);