diff --git a/3rdparty/glslang/CMakeLists.txt b/3rdparty/glslang/CMakeLists.txt
index 9bc94b01a..a0f0352b2 100644
--- a/3rdparty/glslang/CMakeLists.txt
+++ b/3rdparty/glslang/CMakeLists.txt
@@ -18,6 +18,8 @@ option(ENABLE_NV_EXTENSIONS "Enables support of Nvidia-specific extensions" ON)
 
 option(ENABLE_HLSL "Enables HLSL input support" ON)
 
+option(ENABLE_OPT "Enables spirv-opt capability if present" ON)
+
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND WIN32)
     set(CMAKE_INSTALL_PREFIX "install" CACHE STRING "..." FORCE)
 endif()
@@ -83,6 +85,17 @@ endfunction(glslang_set_link_args)
 # We depend on these for later projects, so they should come first.
 add_subdirectory(External)
 
+if(NOT TARGET SPIRV-Tools-opt)
+    set(ENABLE_OPT OFF)
+endif()
+
+if(ENABLE_OPT)
+    message(STATUS "optimizer enabled")
+    add_definitions(-DENABLE_OPT)
+elseif(ENABLE_HLSL)
+    message(STATUS "spirv-tools not linked - illegal SPIRV may be generated for HLSL")
+endif()
+
 add_subdirectory(glslang)
 add_subdirectory(OGLCompilersDLL)
 if(ENABLE_GLSLANG_BINARIES)
diff --git a/3rdparty/glslang/External/CMakeLists.txt b/3rdparty/glslang/External/CMakeLists.txt
index 4f694ee74..d9e071e88 100644
--- a/3rdparty/glslang/External/CMakeLists.txt
+++ b/3rdparty/glslang/External/CMakeLists.txt
@@ -33,3 +33,10 @@ if(BUILD_TESTING)
             "Google Mock was not found - tests based on that will not build")
     endif()
 endif()
+
+if(ENABLE_OPT AND NOT TARGET SPIRV-Tools-opt)
+    if(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/spirv-tools)
+        add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/spirv-tools spirv-tools)
+    endif()
+endif()
+
diff --git a/3rdparty/glslang/SPIRV/CMakeLists.txt b/3rdparty/glslang/SPIRV/CMakeLists.txt
index 3c5ebaba7..b1c027779 100755
--- a/3rdparty/glslang/SPIRV/CMakeLists.txt
+++ b/3rdparty/glslang/SPIRV/CMakeLists.txt
@@ -42,12 +42,21 @@ endif(ENABLE_NV_EXTENSIONS)
 add_library(SPIRV STATIC ${SOURCES} ${HEADERS})
 set_property(TARGET SPIRV PROPERTY FOLDER glslang)
 set_property(TARGET SPIRV PROPERTY POSITION_INDEPENDENT_CODE ON)
-target_link_libraries(SPIRV glslang)
 
 add_library(SPVRemapper STATIC ${SPVREMAP_SOURCES} ${SPVREMAP_HEADERS})
 set_property(TARGET SPVRemapper PROPERTY FOLDER glslang)
 set_property(TARGET SPVRemapper PROPERTY POSITION_INDEPENDENT_CODE ON)
 
+if(ENABLE_OPT)
+    target_include_directories(SPIRV
+        PRIVATE ${spirv-tools_SOURCE_DIR}/include
+        PRIVATE ${spirv-tools_SOURCE_DIR}/source
+    )
+    target_link_libraries(SPIRV glslang SPIRV-Tools-opt SPVRemapper)
+else()
+    target_link_libraries(SPIRV glslang)
+endif(ENABLE_OPT)
+
 if(WIN32)
     source_group("Source" FILES ${SOURCES} ${HEADERS})
     source_group("Source" FILES ${SPVREMAP_SOURCES} ${SPVREMAP_HEADERS})
diff --git a/3rdparty/glslang/SPIRV/GlslangToSpv.cpp b/3rdparty/glslang/SPIRV/GlslangToSpv.cpp
index 40f7508e4..9dec286cd 100755
--- a/3rdparty/glslang/SPIRV/GlslangToSpv.cpp
+++ b/3rdparty/glslang/SPIRV/GlslangToSpv.cpp
@@ -1081,8 +1081,10 @@ void TGlslangToSpvTraverser::visitSymbol(glslang::TIntermSymbol* symbol)
     // Include all "static use" and "linkage only" interface variables on the OpEntryPoint instruction
     if (builder.isPointer(id)) {
         spv::StorageClass sc = builder.getStorageClass(id);
-        if (sc == spv::StorageClassInput || sc == spv::StorageClassOutput)
-            iOSet.insert(id);
+        if (sc == spv::StorageClassInput || sc == spv::StorageClassOutput) {
+            if (!symbol->getType().isStruct() || symbol->getType().getStruct()->size() > 0)
+                iOSet.insert(id);
+        }
     }
 
     // Only process non-linkage-only nodes for generating actual static uses
diff --git a/3rdparty/glslang/Test/100samplerExternal.frag b/3rdparty/glslang/Test/100samplerExternal.frag
new file mode 100644
index 000000000..9f6f397e0
--- /dev/null
+++ b/3rdparty/glslang/Test/100samplerExternal.frag
@@ -0,0 +1,41 @@
+#version 100
+
+#extension GL_OES_EGL_image_external : enable
+
+uniform samplerExternalOES sExt;
+precision mediump samplerExternalOES;
+uniform samplerExternalOES mediumExt;
+uniform highp samplerExternalOES highExt;
+
+void main()
+{
+    texture2D(sExt, vec2(0.2));
+    texture2D(mediumExt, vec2(0.2));
+    texture2D(highExt, vec2(0.2));
+    texture2DProj(sExt, vec3(0.3));
+    texture2DProj(sExt, vec4(0.3));
+
+    int lod = 0;
+    highp float bias = 0.01;
+    textureSize(sExt, lod);  // ERROR
+    texture(sExt, vec2(0.2));  // ERROR
+    texture(sExt, vec2(0.2), bias);  // ERROR
+    textureProj(sExt, vec3(0.2));  // ERROR
+    textureProj(sExt, vec3(0.2), bias);  // ERROR
+    textureProj(sExt, vec4(0.2));  // ERROR
+    textureProj(sExt, vec4(0.2), bias);  // ERROR
+    texelFetch(sExt, ivec2(4), lod);  // ERROR
+
+    texture3D(sExt, vec3(0.3));  // ERROR
+    texture2DProjLod(sExt, vec3(0.3), 0.3);  // ERROR
+    texture(sExt, vec3(0.3));  // ERROR
+    textureProjLod(sExt, vec3(0.3), 0.3);  // ERROR
+}
+
+#extension GL_OES_EGL_image_external : disable
+
+#extension GL_OES_EGL_image_external_essl3 : enable
+uniform samplerExternalOES badExt;  // ERROR
+#extension GL_OES_EGL_image_external_essl3 : disable
+
+uniform samplerExternalOES badExt;  // ERROR
diff --git a/3rdparty/glslang/Test/300samplerExternal.frag b/3rdparty/glslang/Test/300samplerExternal.frag
new file mode 100644
index 000000000..3724f8e0a
--- /dev/null
+++ b/3rdparty/glslang/Test/300samplerExternal.frag
@@ -0,0 +1,41 @@
+#version 300 es
+
+#extension GL_OES_EGL_image_external_essl3 : enable
+
+uniform samplerExternalOES sExt;
+precision mediump samplerExternalOES;
+uniform samplerExternalOES mediumExt;
+uniform highp samplerExternalOES highExt;
+
+void main()
+{
+    texture2D(sExt, vec2(0.2));  // ERROR
+    texture2D(mediumExt, vec2(0.2));  // ERROR
+    texture2D(highExt, vec2(0.2));  // ERROR
+    texture2DProj(sExt, vec3(0.3));  // ERROR
+    texture2DProj(sExt, vec4(0.3));  // ERROR
+
+    int lod = 0;
+    highp float bias = 0.01;
+    textureSize(sExt, lod);
+    texture(sExt, vec2(0.2));
+    texture(sExt, vec2(0.2), bias);
+    textureProj(sExt, vec3(0.2));
+    textureProj(sExt, vec3(0.2), bias);
+    textureProj(sExt, vec4(0.2));
+    textureProj(sExt, vec4(0.2), bias);
+    texelFetch(sExt, ivec2(4), lod);
+
+    texture3D(sExt, vec3(0.3));  // ERROR
+    texture2DProjLod(sExt, vec3(0.3), 0.3);  // ERROR
+    texture(sExt, vec3(0.3));  // ERROR
+    textureProjLod(sExt, vec3(0.3), 0.3);  // ERROR
+}
+
+#extension GL_OES_EGL_image_external_essl3 : disable
+
+#extension GL_OES_EGL_image_external : enable
+uniform samplerExternalOES badExt;  // ERROR
+#extension GL_OES_EGL_image_external : disable
+
+uniform samplerExternalOES badExt;  // ERROR
diff --git a/3rdparty/glslang/Test/baseResults/100samplerExternal.frag.out b/3rdparty/glslang/Test/baseResults/100samplerExternal.frag.out
new file mode 100644
index 000000000..8b689c761
--- /dev/null
+++ b/3rdparty/glslang/Test/baseResults/100samplerExternal.frag.out
@@ -0,0 +1,172 @@
+100samplerExternal.frag
+ERROR: 0:20: 'textureSize' : no matching overloaded function found 
+ERROR: 0:21: 'texture' : no matching overloaded function found 
+ERROR: 0:22: 'texture' : no matching overloaded function found 
+ERROR: 0:23: 'textureProj' : no matching overloaded function found 
+ERROR: 0:24: 'textureProj' : no matching overloaded function found 
+ERROR: 0:25: 'textureProj' : no matching overloaded function found 
+ERROR: 0:26: 'textureProj' : no matching overloaded function found 
+ERROR: 0:27: 'texelFetch' : no matching overloaded function found 
+ERROR: 0:29: 'texture3D' : no matching overloaded function found 
+ERROR: 0:30: 'texture2DProjLod' : no matching overloaded function found 
+ERROR: 0:31: 'texture' : no matching overloaded function found 
+ERROR: 0:32: 'textureProjLod' : no matching overloaded function found 
+ERROR: 0:38: 'samplerExternalOES' : required extension not requested: GL_OES_EGL_image_external
+ERROR: 0:41: '' :  syntax error, unexpected IDENTIFIER, expecting LEFT_BRACE or COMMA or SEMICOLON
+ERROR: 14 compilation errors.  No code generated.
+
+
+Shader version: 100
+Requested GL_OES_EGL_image_external
+Requested GL_OES_EGL_image_external_essl3
+ERROR: node is still EOpNull!
+0:10  Function Definition: main( ( global void)
+0:10    Function Parameters: 
+0:12    Sequence
+0:12      texture ( global lowp 4-component vector of float)
+0:12        'sExt' ( uniform lowp samplerExternalOES)
+0:12        Constant:
+0:12          0.200000
+0:12          0.200000
+0:13      texture ( global mediump 4-component vector of float)
+0:13        'mediumExt' ( uniform mediump samplerExternalOES)
+0:13        Constant:
+0:13          0.200000
+0:13          0.200000
+0:14      texture ( global highp 4-component vector of float)
+0:14        'highExt' ( uniform highp samplerExternalOES)
+0:14        Constant:
+0:14          0.200000
+0:14          0.200000
+0:15      textureProj ( global lowp 4-component vector of float)
+0:15        'sExt' ( uniform lowp samplerExternalOES)
+0:15        Constant:
+0:15          0.300000
+0:15          0.300000
+0:15          0.300000
+0:16      textureProj ( global lowp 4-component vector of float)
+0:16        'sExt' ( uniform lowp samplerExternalOES)
+0:16        Constant:
+0:16          0.300000
+0:16          0.300000
+0:16          0.300000
+0:16          0.300000
+0:18      Sequence
+0:18        move second child to first child ( temp mediump int)
+0:18          'lod' ( temp mediump int)
+0:18          Constant:
+0:18            0 (const int)
+0:19      Sequence
+0:19        move second child to first child ( temp highp float)
+0:19          'bias' ( temp highp float)
+0:19          Constant:
+0:19            0.010000
+0:20      Constant:
+0:20        0.000000
+0:21      Constant:
+0:21        0.000000
+0:22      Constant:
+0:22        0.000000
+0:23      Constant:
+0:23        0.000000
+0:24      Constant:
+0:24        0.000000
+0:25      Constant:
+0:25        0.000000
+0:26      Constant:
+0:26        0.000000
+0:27      Constant:
+0:27        0.000000
+0:29      Constant:
+0:29        0.000000
+0:30      Constant:
+0:30        0.000000
+0:31      Constant:
+0:31        0.000000
+0:32      Constant:
+0:32        0.000000
+0:?   Linker Objects
+0:?     'sExt' ( uniform lowp samplerExternalOES)
+0:?     'mediumExt' ( uniform mediump samplerExternalOES)
+0:?     'highExt' ( uniform highp samplerExternalOES)
+0:?     'badExt' ( uniform mediump samplerExternalOES)
+
+
+Linked fragment stage:
+
+
+Shader version: 100
+Requested GL_OES_EGL_image_external
+Requested GL_OES_EGL_image_external_essl3
+ERROR: node is still EOpNull!
+0:10  Function Definition: main( ( global void)
+0:10    Function Parameters: 
+0:12    Sequence
+0:12      texture ( global lowp 4-component vector of float)
+0:12        'sExt' ( uniform lowp samplerExternalOES)
+0:12        Constant:
+0:12          0.200000
+0:12          0.200000
+0:13      texture ( global mediump 4-component vector of float)
+0:13        'mediumExt' ( uniform mediump samplerExternalOES)
+0:13        Constant:
+0:13          0.200000
+0:13          0.200000
+0:14      texture ( global highp 4-component vector of float)
+0:14        'highExt' ( uniform highp samplerExternalOES)
+0:14        Constant:
+0:14          0.200000
+0:14          0.200000
+0:15      textureProj ( global lowp 4-component vector of float)
+0:15        'sExt' ( uniform lowp samplerExternalOES)
+0:15        Constant:
+0:15          0.300000
+0:15          0.300000
+0:15          0.300000
+0:16      textureProj ( global lowp 4-component vector of float)
+0:16        'sExt' ( uniform lowp samplerExternalOES)
+0:16        Constant:
+0:16          0.300000
+0:16          0.300000
+0:16          0.300000
+0:16          0.300000
+0:18      Sequence
+0:18        move second child to first child ( temp mediump int)
+0:18          'lod' ( temp mediump int)
+0:18          Constant:
+0:18            0 (const int)
+0:19      Sequence
+0:19        move second child to first child ( temp highp float)
+0:19          'bias' ( temp highp float)
+0:19          Constant:
+0:19            0.010000
+0:20      Constant:
+0:20        0.000000
+0:21      Constant:
+0:21        0.000000
+0:22      Constant:
+0:22        0.000000
+0:23      Constant:
+0:23        0.000000
+0:24      Constant:
+0:24        0.000000
+0:25      Constant:
+0:25        0.000000
+0:26      Constant:
+0:26        0.000000
+0:27      Constant:
+0:27        0.000000
+0:29      Constant:
+0:29        0.000000
+0:30      Constant:
+0:30        0.000000
+0:31      Constant:
+0:31        0.000000
+0:32      Constant:
+0:32        0.000000
+0:?   Linker Objects
+0:?     'sExt' ( uniform lowp samplerExternalOES)
+0:?     'mediumExt' ( uniform mediump samplerExternalOES)
+0:?     'highExt' ( uniform highp samplerExternalOES)
+0:?     'badExt' ( uniform mediump samplerExternalOES)
+
diff --git a/3rdparty/glslang/Test/baseResults/300samplerExternal.frag.out b/3rdparty/glslang/Test/baseResults/300samplerExternal.frag.out
new file mode 100644
index 000000000..9074552e8
--- /dev/null
+++ b/3rdparty/glslang/Test/baseResults/300samplerExternal.frag.out
@@ -0,0 +1,197 @@
+300samplerExternal.frag
+ERROR: 0:12: 'texture2D' : no matching overloaded function found 
+ERROR: 0:13: 'texture2D' : no matching overloaded function found 
+ERROR: 0:14: 'texture2D' : no matching overloaded function found 
+ERROR: 0:15: 'texture2DProj' : no matching overloaded function found 
+ERROR: 0:16: 'texture2DProj' : no matching overloaded function found 
+ERROR: 0:29: 'texture3D' : no matching overloaded function found 
+ERROR: 0:30: 'texture2DProjLod' : no matching overloaded function found 
+ERROR: 0:31: 'texture' : no matching overloaded function found 
+ERROR: 0:32: 'textureProjLod' : no matching overloaded function found 
+ERROR: 0:38: 'samplerExternalOES' : required extension not requested: GL_OES_EGL_image_external_essl3
+ERROR: 0:41: '' :  syntax error, unexpected IDENTIFIER, expecting LEFT_BRACE or COMMA or SEMICOLON
+ERROR: 11 compilation errors.  No code generated.
+
+
+Shader version: 300
+Requested GL_OES_EGL_image_external
+Requested GL_OES_EGL_image_external_essl3
+ERROR: node is still EOpNull!
+0:10  Function Definition: main( ( global void)
+0:10    Function Parameters: 
+0:12    Sequence
+0:12      Constant:
+0:12        0.000000
+0:13      Constant:
+0:13        0.000000
+0:14      Constant:
+0:14        0.000000
+0:15      Constant:
+0:15        0.000000
+0:16      Constant:
+0:16        0.000000
+0:18      Sequence
+0:18        move second child to first child ( temp mediump int)
+0:18          'lod' ( temp mediump int)
+0:18          Constant:
+0:18            0 (const int)
+0:19      Sequence
+0:19        move second child to first child ( temp highp float)
+0:19          'bias' ( temp highp float)
+0:19          Constant:
+0:19            0.010000
+0:20      textureSize ( global highp 2-component vector of int, operation at mediump)
+0:20        'sExt' ( uniform lowp samplerExternalOES)
+0:20        'lod' ( temp mediump int)
+0:21      texture ( global lowp 4-component vector of float)
+0:21        'sExt' ( uniform lowp samplerExternalOES)
+0:21        Constant:
+0:21          0.200000
+0:21          0.200000
+0:22      texture ( global lowp 4-component vector of float, operation at highp)
+0:22        'sExt' ( uniform lowp samplerExternalOES)
+0:22        Constant:
+0:22          0.200000
+0:22          0.200000
+0:22        'bias' ( temp highp float)
+0:23      textureProj ( global lowp 4-component vector of float)
+0:23        'sExt' ( uniform lowp samplerExternalOES)
+0:23        Constant:
+0:23          0.200000
+0:23          0.200000
+0:23          0.200000
+0:24      textureProj ( global lowp 4-component vector of float, operation at highp)
+0:24        'sExt' ( uniform lowp samplerExternalOES)
+0:24        Constant:
+0:24          0.200000
+0:24          0.200000
+0:24          0.200000
+0:24        'bias' ( temp highp float)
+0:25      textureProj ( global lowp 4-component vector of float)
+0:25        'sExt' ( uniform lowp samplerExternalOES)
+0:25        Constant:
+0:25          0.200000
+0:25          0.200000
+0:25          0.200000
+0:25          0.200000
+0:26      textureProj ( global lowp 4-component vector of float, operation at highp)
+0:26        'sExt' ( uniform lowp samplerExternalOES)
+0:26        Constant:
+0:26          0.200000
+0:26          0.200000
+0:26          0.200000
+0:26          0.200000
+0:26        'bias' ( temp highp float)
+0:27      textureFetch ( global lowp 4-component vector of float, operation at mediump)
+0:27        'sExt' ( uniform lowp samplerExternalOES)
+0:27        Constant:
+0:27          4 (const int)
+0:27          4 (const int)
+0:27        'lod' ( temp mediump int)
+0:29      Constant:
+0:29        0.000000
+0:30      Constant:
+0:30        0.000000
+0:31      Constant:
+0:31        0.000000
+0:32      Constant:
+0:32        0.000000
+0:?   Linker Objects
+0:?     'sExt' ( uniform lowp samplerExternalOES)
+0:?     'mediumExt' ( uniform mediump samplerExternalOES)
+0:?     'highExt' ( uniform highp samplerExternalOES)
+0:?     'badExt' ( uniform mediump samplerExternalOES)
+
+
+Linked fragment stage:
+
+
+Shader version: 300
+Requested GL_OES_EGL_image_external
+Requested GL_OES_EGL_image_external_essl3
+ERROR: node is still EOpNull!
+0:10  Function Definition: main( ( global void)
+0:10    Function Parameters: 
+0:12    Sequence
+0:12      Constant:
+0:12        0.000000
+0:13      Constant:
+0:13        0.000000
+0:14      Constant:
+0:14        0.000000
+0:15      Constant:
+0:15        0.000000
+0:16      Constant:
+0:16        0.000000
+0:18      Sequence
+0:18        move second child to first child ( temp mediump int)
+0:18          'lod' ( temp mediump int)
+0:18          Constant:
+0:18            0 (const int)
+0:19      Sequence
+0:19        move second child to first child ( temp highp float)
+0:19          'bias' ( temp highp float)
+0:19          Constant:
+0:19            0.010000
+0:20      textureSize ( global highp 2-component vector of int, operation at mediump)
+0:20        'sExt' ( uniform lowp samplerExternalOES)
+0:20        'lod' ( temp mediump int)
+0:21      texture ( global lowp 4-component vector of float)
+0:21        'sExt' ( uniform lowp samplerExternalOES)
+0:21        Constant:
+0:21          0.200000
+0:21          0.200000
+0:22      texture ( global lowp 4-component vector of float, operation at highp)
+0:22        'sExt' ( uniform lowp samplerExternalOES)
+0:22        Constant:
+0:22          0.200000
+0:22          0.200000
+0:22        'bias' ( temp highp float)
+0:23      textureProj ( global lowp 4-component vector of float)
+0:23        'sExt' ( uniform lowp samplerExternalOES)
+0:23        Constant:
+0:23          0.200000
+0:23          0.200000
+0:23          0.200000
+0:24      textureProj ( global lowp 4-component vector of float, operation at highp)
+0:24        'sExt' ( uniform lowp samplerExternalOES)
+0:24        Constant:
+0:24          0.200000
+0:24          0.200000
+0:24          0.200000
+0:24        'bias' ( temp highp float)
+0:25      textureProj ( global lowp 4-component vector of float)
+0:25        'sExt' ( uniform lowp samplerExternalOES)
+0:25        Constant:
+0:25          0.200000
+0:25          0.200000
+0:25          0.200000
+0:25          0.200000
+0:26      textureProj ( global lowp 4-component vector of float, operation at highp)
+0:26        'sExt' ( uniform lowp samplerExternalOES)
+0:26        Constant:
+0:26          0.200000
+0:26          0.200000
+0:26          0.200000
+0:26          0.200000
+0:26        'bias' ( temp highp float)
+0:27      textureFetch ( global lowp 4-component vector of float, operation at mediump)
+0:27        'sExt' ( uniform lowp samplerExternalOES)
+0:27        Constant:
+0:27          4 (const int)
+0:27          4 (const int)
+0:27        'lod' ( temp mediump int)
+0:29      Constant:
+0:29        0.000000
+0:30      Constant:
+0:30        0.000000
+0:31      Constant:
+0:31        0.000000
+0:32      Constant:
+0:32        0.000000
+0:?   Linker Objects
+0:?     'sExt' ( uniform lowp samplerExternalOES)
+0:?     'mediumExt' ( uniform mediump samplerExternalOES)
+0:?     'highExt' ( uniform highp samplerExternalOES)
+0:?     'badExt' ( uniform mediump samplerExternalOES)
+
diff --git a/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.frag.out b/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.frag.out
index 5440045db..591318049 100644
--- a/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.frag.out
+++ b/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.frag.out
@@ -56,7 +56,7 @@ gl_FragCoord origin is upper left
                               Capability Shader
                1:             ExtInstImport  "GLSL.std.450"
                               MemoryModel Logical GLSL450
-                              EntryPoint Fragment 4  "main" 20 23
+                              EntryPoint Fragment 4  "main"
                               ExecutionMode 4 OriginUpperLeft
                               Source HLSL 500
                               Name 4  "main"
diff --git a/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.vert.out b/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.vert.out
index c8cea5d1f..f93bb63d2 100644
--- a/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.vert.out
+++ b/3rdparty/glslang/Test/baseResults/hlsl.emptystructreturn.vert.out
@@ -54,7 +54,7 @@ Shader version: 500
                               Capability Shader
                1:             ExtInstImport  "GLSL.std.450"
                               MemoryModel Logical GLSL450
-                              EntryPoint Vertex 4  "main" 20 23
+                              EntryPoint Vertex 4  "main"
                               Source HLSL 500
                               Name 4  "main"
                               Name 6  "vs_in"
diff --git a/3rdparty/glslang/glslang/MachineIndependent/Initialize.cpp b/3rdparty/glslang/glslang/MachineIndependent/Initialize.cpp
index fea8a6b30..f8138ffc2 100644
--- a/3rdparty/glslang/glslang/MachineIndependent/Initialize.cpp
+++ b/3rdparty/glslang/glslang/MachineIndependent/Initialize.cpp
@@ -1324,10 +1324,25 @@ void TBuiltIns::initialize(int version, EProfile profile, const SpvVersion& spvV
 
     if (profile == EEsProfile) {
         if (spvVersion.spv == 0) {
+            if (version < 300) {
+                commonBuiltins.append(
+                    "vec4 texture2D(samplerExternalOES, vec2 coord);" // GL_OES_EGL_image_external
+                    "vec4 texture2DProj(samplerExternalOES, vec3);"   // GL_OES_EGL_image_external
+                    "vec4 texture2DProj(samplerExternalOES, vec4);"   // GL_OES_EGL_image_external
+                "\n");
+            } else {
+                commonBuiltins.append(
+                    "highp ivec2 textureSize(samplerExternalOES, int lod);"   // GL_OES_EGL_image_external_essl3
+                    "vec4 texture(samplerExternalOES, vec2);"                 // GL_OES_EGL_image_external_essl3
+                    "vec4 texture(samplerExternalOES, vec2, float bias);"     // GL_OES_EGL_image_external_essl3
+                    "vec4 textureProj(samplerExternalOES, vec3);"             // GL_OES_EGL_image_external_essl3
+                    "vec4 textureProj(samplerExternalOES, vec3, float bias);" // GL_OES_EGL_image_external_essl3
+                    "vec4 textureProj(samplerExternalOES, vec4);"             // GL_OES_EGL_image_external_essl3
+                    "vec4 textureProj(samplerExternalOES, vec4, float bias);" // GL_OES_EGL_image_external_essl3
+                    "vec4 texelFetch(samplerExternalOES, ivec2, int lod);"    // GL_OES_EGL_image_external_essl3
+                "\n");
+            }
             commonBuiltins.append(
-                "vec4 texture2D(samplerExternalOES, vec2 coord);"  // GL_OES_EGL_image_external, caught by keyword check
-                "vec4 texture2DProj(samplerExternalOES, vec3);"    // GL_OES_EGL_image_external, caught by keyword check
-                "vec4 texture2DProj(samplerExternalOES, vec4);"    // GL_OES_EGL_image_external, caught by keyword check
                 "vec4 texture2DGradEXT(sampler2D, vec2, vec2, vec2);"      // GL_EXT_shader_texture_lod
                 "vec4 texture2DProjGradEXT(sampler2D, vec3, vec2, vec2);"  // GL_EXT_shader_texture_lod
                 "vec4 texture2DProjGradEXT(sampler2D, vec4, vec2, vec2);"  // GL_EXT_shader_texture_lod
diff --git a/3rdparty/glslang/glslang/MachineIndependent/ParseHelper.cpp b/3rdparty/glslang/glslang/MachineIndependent/ParseHelper.cpp
index 8154e687a..7f721a04f 100644
--- a/3rdparty/glslang/glslang/MachineIndependent/ParseHelper.cpp
+++ b/3rdparty/glslang/glslang/MachineIndependent/ParseHelper.cpp
@@ -2438,6 +2438,16 @@ void TParseContext::boolCheck(const TSourceLoc& loc, const TPublicType& pType)
 
 void TParseContext::samplerCheck(const TSourceLoc& loc, const TType& type, const TString& identifier, TIntermTyped* /*initializer*/)
 {
+    // Check that the appropriate extension is enabled if external sampler is used.
+    // There are two extensions. The correct one must be used based on GLSL version.
+    if (type.getBasicType() == EbtSampler && type.getSampler().external) {
+        if (version < 300) {
+            requireExtensions(loc, 1, &E_GL_OES_EGL_image_external, "samplerExternalOES");
+        } else {
+            requireExtensions(loc, 1, &E_GL_OES_EGL_image_external_essl3, "samplerExternalOES");
+        }
+    }
+
     if (type.getQualifier().storage == EvqUniform)
         return;
 
diff --git a/3rdparty/glslang/glslang/MachineIndependent/Scan.cpp b/3rdparty/glslang/glslang/MachineIndependent/Scan.cpp
index 25122eec1..68d1500b4 100644
--- a/3rdparty/glslang/glslang/MachineIndependent/Scan.cpp
+++ b/3rdparty/glslang/glslang/MachineIndependent/Scan.cpp
@@ -1152,7 +1152,9 @@ int TScanContext::tokenizeIdentifier()
 
     case SAMPLEREXTERNALOES:
         afterType = true;
-        if (parseContext.symbolTable.atBuiltInLevel() || parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external))
+        if (parseContext.symbolTable.atBuiltInLevel() ||
+            parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external) ||
+            parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external_essl3))
             return keyword;
         return identifierOrType();
 
diff --git a/3rdparty/glslang/glslang/MachineIndependent/Versions.cpp b/3rdparty/glslang/glslang/MachineIndependent/Versions.cpp
index c4329e607..807fe42b6 100644
--- a/3rdparty/glslang/glslang/MachineIndependent/Versions.cpp
+++ b/3rdparty/glslang/glslang/MachineIndependent/Versions.cpp
@@ -154,6 +154,7 @@ void TParseVersions::initializeExtensionBehavior()
     extensionBehavior[E_GL_OES_standard_derivatives]         = EBhDisable;
     extensionBehavior[E_GL_EXT_frag_depth]                   = EBhDisable;
     extensionBehavior[E_GL_OES_EGL_image_external]           = EBhDisable;
+    extensionBehavior[E_GL_OES_EGL_image_external_essl3]     = EBhDisable;
     extensionBehavior[E_GL_EXT_shader_texture_lod]           = EBhDisable;
     extensionBehavior[E_GL_EXT_shadow_samplers]              = EBhDisable;
     extensionBehavior[E_GL_ARB_texture_rectangle]            = EBhDisable;
@@ -261,6 +262,7 @@ void TParseVersions::getPreamble(std::string& preamble)
             "#define GL_OES_standard_derivatives 1\n"
             "#define GL_EXT_frag_depth 1\n"
             "#define GL_OES_EGL_image_external 1\n"
+            "#define GL_OES_EGL_image_external_essl3 1\n"
             "#define GL_EXT_shader_texture_lod 1\n"
             "#define GL_EXT_shadow_samplers 1\n"
 
diff --git a/3rdparty/glslang/glslang/MachineIndependent/Versions.h b/3rdparty/glslang/glslang/MachineIndependent/Versions.h
index d5aca70ee..9399e9dd2 100644
--- a/3rdparty/glslang/glslang/MachineIndependent/Versions.h
+++ b/3rdparty/glslang/glslang/MachineIndependent/Versions.h
@@ -107,6 +107,7 @@ const char* const E_GL_OES_texture_3D                   = "GL_OES_texture_3D";
 const char* const E_GL_OES_standard_derivatives         = "GL_OES_standard_derivatives";
 const char* const E_GL_EXT_frag_depth                   = "GL_EXT_frag_depth";
 const char* const E_GL_OES_EGL_image_external           = "GL_OES_EGL_image_external";
+const char* const E_GL_OES_EGL_image_external_essl3     = "GL_OES_EGL_image_external_essl3";
 const char* const E_GL_EXT_shader_texture_lod           = "GL_EXT_shader_texture_lod";
 const char* const E_GL_EXT_shadow_samplers              = "GL_EXT_shadow_samplers";
 
diff --git a/3rdparty/glslang/gtests/AST.FromFile.cpp b/3rdparty/glslang/gtests/AST.FromFile.cpp
index ed6a13e85..fbbf81b51 100644
--- a/3rdparty/glslang/gtests/AST.FromFile.cpp
+++ b/3rdparty/glslang/gtests/AST.FromFile.cpp
@@ -62,6 +62,7 @@ INSTANTIATE_TEST_CASE_P(
         "versionsErrors.frag",
         "versionsErrors.vert",
         "100.frag",
+        "100samplerExternal.frag",
         "120.vert",
         "120.frag",
         "130.vert",
@@ -93,6 +94,7 @@ INSTANTIATE_TEST_CASE_P(
         "300layout.frag",
         "300operations.frag",
         "300block.frag",
+        "300samplerExternal.frag",
         "310.comp",
         "310.vert",
         "310.geom",