diff --git a/Test/150.frag b/Test/150.frag
index c8c4cf0402..228e4f0d38 100644
--- a/Test/150.frag
+++ b/Test/150.frag
@@ -154,3 +154,31 @@ void qlodPass()
     lod = textureQueryLod(sampBuf, pf);     // ERROR
     lod = textureQueryLod(sampRect, pf2);   // ERROR
 }
+
+// Test extension GL_EXT_shader_integer_mix
+#extension GL_EXT_shader_integer_mix : enable
+bool b1, b2, b;
+int x,y;
+uint z,w;
+
+void testmix()
+{
+    int ival  = mix(x, y, b);
+    ivec2 iv2 = mix(ivec2(x), ivec2(y), bvec2(b));
+    ivec3 iv3 = mix(ivec3(x), ivec3(y), bvec3(b));
+    ivec4 iv4 = mix(ivec4(x), ivec4(x), bvec4(b));
+    uint  uiv = mix(z, w, b);
+    uvec2 uv2 = mix(uvec2(z), uvec2(z), bvec2(b));
+    uvec3 uv3 = mix(uvec3(z), uvec3(z), bvec3(b));
+    uvec4 uv4 = mix(uvec4(z), uvec4(z), bvec4(b));
+    bool  bv  = mix(b1, b2, b);
+    bvec2 bv2 = mix(bvec2(b1), bvec2(b2), bvec2(b));
+    bvec3 bv3 = mix(bvec3(b1), bvec3(b2), bvec3(b));
+    bvec4 bv4 = mix(bvec4(b1), bvec4(b2), bvec4(b));
+}
+
+#extension GL_EXT_shader_integer_mix : disable
+void testmixFail()
+{
+    int ival  = mix(x, y, b); // Error since extenson GL_EXT_shader_integer_mix is disabled
+}
diff --git a/Test/300.frag b/Test/300.frag
index ca2e2cb3e5..ab45c6dba6 100644
--- a/Test/300.frag
+++ b/Test/300.frag
@@ -149,6 +149,34 @@ uniform mediump;       // ERROR
 
 layout(early_fragment_tests) in;  // ERROR
 
+// Test extension GL_EXT_shader_integer_mix
+#extension GL_EXT_shader_integer_mix : enable
+bool b1, b2, b;
+int x,y;
+uint z,w;
+
+void testmix()
+{
+    int ival  = mix(x, y, b);
+    ivec2 iv2 = mix(ivec2(x), ivec2(y), bvec2(b));
+    ivec3 iv3 = mix(ivec3(x), ivec3(y), bvec3(b));
+    ivec4 iv4 = mix(ivec4(x), ivec4(x), bvec4(b));
+    uint  uiv = mix(z, w, b);
+    uvec2 uv2 = mix(uvec2(z), uvec2(z), bvec2(b));
+    uvec3 uv3 = mix(uvec3(z), uvec3(z), bvec3(b));
+    uvec4 uv4 = mix(uvec4(z), uvec4(z), bvec4(b));
+    bool  bv  = mix(b1, b2, b);
+    bvec2 bv2 = mix(bvec2(b1), bvec2(b2), bvec2(b));
+    bvec3 bv3 = mix(bvec3(b1), bvec3(b2), bvec3(b));
+    bvec4 bv4 = mix(bvec4(b1), bvec4(b2), bvec4(b));
+}
+
+#extension GL_EXT_shader_integer_mix : disable
+void testmixFail()
+{
+    int ival  = mix(x, y, b); // Error since extenson GL_EXT_shader_integer_mix is disabled
+}
+
 #ifndef GL_FRAGMENT_PRECISION_HIGH
 #error missing GL_FRAGMENT_PRECISION_HIGH
 #endif
diff --git a/Test/baseResults/150.frag.out b/Test/baseResults/150.frag.out
index 52e7c328f2..7672b5817b 100644
--- a/Test/baseResults/150.frag.out
+++ b/Test/baseResults/150.frag.out
@@ -17,7 +17,8 @@ ERROR: 0:154: 'textureQueryLod' : no matching overloaded function found
 ERROR: 0:154: 'assign' :  cannot convert from ' const float' to ' temp 2-component vector of float'
 ERROR: 0:155: 'textureQueryLod' : no matching overloaded function found 
 ERROR: 0:155: 'assign' :  cannot convert from ' const float' to ' temp 2-component vector of float'
-ERROR: 18 compilation errors.  No code generated.
+ERROR: 0:183: 'mix' : required extension not requested: GL_EXT_shader_integer_mix
+ERROR: 19 compilation errors.  No code generated.
 
 
 Shader version: 150
@@ -25,6 +26,7 @@ Requested GL_ARB_gpu_shader_fp64
 Requested GL_ARB_shader_bit_encoding
 Requested GL_ARB_shading_language_packing
 Requested GL_ARB_texture_query_lod
+Requested GL_EXT_shader_integer_mix
 gl_FragCoord pixel center is integer
 gl_FragCoord origin is upper left
 ERROR: node is still EOpNull!
@@ -290,6 +292,130 @@ ERROR: node is still EOpNull!
 0:152          'pf2' ( temp 2-component vector of float)
 0:154      'lod' ( temp 2-component vector of float)
 0:155      'lod' ( temp 2-component vector of float)
+0:164  Function Definition: testmix( ( global void)
+0:164    Function Parameters: 
+0:166    Sequence
+0:166      Sequence
+0:166        move second child to first child ( temp int)
+0:166          'ival' ( temp int)
+0:166          mix ( global int)
+0:166            'x' ( global int)
+0:166            'y' ( global int)
+0:166            'b' ( global bool)
+0:167      Sequence
+0:167        move second child to first child ( temp 2-component vector of int)
+0:167          'iv2' ( temp 2-component vector of int)
+0:167          mix ( global 2-component vector of int)
+0:167            Construct ivec2 ( temp 2-component vector of int)
+0:167              'x' ( global int)
+0:167            Construct ivec2 ( temp 2-component vector of int)
+0:167              'y' ( global int)
+0:167            Construct bvec2 ( temp 2-component vector of bool)
+0:167              'b' ( global bool)
+0:168      Sequence
+0:168        move second child to first child ( temp 3-component vector of int)
+0:168          'iv3' ( temp 3-component vector of int)
+0:168          mix ( global 3-component vector of int)
+0:168            Construct ivec3 ( temp 3-component vector of int)
+0:168              'x' ( global int)
+0:168            Construct ivec3 ( temp 3-component vector of int)
+0:168              'y' ( global int)
+0:168            Construct bvec3 ( temp 3-component vector of bool)
+0:168              'b' ( global bool)
+0:169      Sequence
+0:169        move second child to first child ( temp 4-component vector of int)
+0:169          'iv4' ( temp 4-component vector of int)
+0:169          mix ( global 4-component vector of int)
+0:169            Construct ivec4 ( temp 4-component vector of int)
+0:169              'x' ( global int)
+0:169            Construct ivec4 ( temp 4-component vector of int)
+0:169              'x' ( global int)
+0:169            Construct bvec4 ( temp 4-component vector of bool)
+0:169              'b' ( global bool)
+0:170      Sequence
+0:170        move second child to first child ( temp uint)
+0:170          'uiv' ( temp uint)
+0:170          mix ( global uint)
+0:170            'z' ( global uint)
+0:170            'w' ( global uint)
+0:170            'b' ( global bool)
+0:171      Sequence
+0:171        move second child to first child ( temp 2-component vector of uint)
+0:171          'uv2' ( temp 2-component vector of uint)
+0:171          mix ( global 2-component vector of uint)
+0:171            Construct uvec2 ( temp 2-component vector of uint)
+0:171              'z' ( global uint)
+0:171            Construct uvec2 ( temp 2-component vector of uint)
+0:171              'z' ( global uint)
+0:171            Construct bvec2 ( temp 2-component vector of bool)
+0:171              'b' ( global bool)
+0:172      Sequence
+0:172        move second child to first child ( temp 3-component vector of uint)
+0:172          'uv3' ( temp 3-component vector of uint)
+0:172          mix ( global 3-component vector of uint)
+0:172            Construct uvec3 ( temp 3-component vector of uint)
+0:172              'z' ( global uint)
+0:172            Construct uvec3 ( temp 3-component vector of uint)
+0:172              'z' ( global uint)
+0:172            Construct bvec3 ( temp 3-component vector of bool)
+0:172              'b' ( global bool)
+0:173      Sequence
+0:173        move second child to first child ( temp 4-component vector of uint)
+0:173          'uv4' ( temp 4-component vector of uint)
+0:173          mix ( global 4-component vector of uint)
+0:173            Construct uvec4 ( temp 4-component vector of uint)
+0:173              'z' ( global uint)
+0:173            Construct uvec4 ( temp 4-component vector of uint)
+0:173              'z' ( global uint)
+0:173            Construct bvec4 ( temp 4-component vector of bool)
+0:173              'b' ( global bool)
+0:174      Sequence
+0:174        move second child to first child ( temp bool)
+0:174          'bv' ( temp bool)
+0:174          mix ( global bool)
+0:174            'b1' ( global bool)
+0:174            'b2' ( global bool)
+0:174            'b' ( global bool)
+0:175      Sequence
+0:175        move second child to first child ( temp 2-component vector of bool)
+0:175          'bv2' ( temp 2-component vector of bool)
+0:175          mix ( global 2-component vector of bool)
+0:175            Construct bvec2 ( temp 2-component vector of bool)
+0:175              'b1' ( global bool)
+0:175            Construct bvec2 ( temp 2-component vector of bool)
+0:175              'b2' ( global bool)
+0:175            Construct bvec2 ( temp 2-component vector of bool)
+0:175              'b' ( global bool)
+0:176      Sequence
+0:176        move second child to first child ( temp 3-component vector of bool)
+0:176          'bv3' ( temp 3-component vector of bool)
+0:176          mix ( global 3-component vector of bool)
+0:176            Construct bvec3 ( temp 3-component vector of bool)
+0:176              'b1' ( global bool)
+0:176            Construct bvec3 ( temp 3-component vector of bool)
+0:176              'b2' ( global bool)
+0:176            Construct bvec3 ( temp 3-component vector of bool)
+0:176              'b' ( global bool)
+0:177      Sequence
+0:177        move second child to first child ( temp 4-component vector of bool)
+0:177          'bv4' ( temp 4-component vector of bool)
+0:177          mix ( global 4-component vector of bool)
+0:177            Construct bvec4 ( temp 4-component vector of bool)
+0:177              'b1' ( global bool)
+0:177            Construct bvec4 ( temp 4-component vector of bool)
+0:177              'b2' ( global bool)
+0:177            Construct bvec4 ( temp 4-component vector of bool)
+0:177              'b' ( global bool)
+0:181  Function Definition: testmixFail( ( global void)
+0:181    Function Parameters: 
+0:183    Sequence
+0:183      Sequence
+0:183        move second child to first child ( temp int)
+0:183          'ival' ( temp int)
+0:183          mix ( global int)
+0:183            'x' ( global int)
+0:183            'y' ( global int)
+0:183            'b' ( global bool)
 0:?   Linker Objects
 0:?     'gl_FragCoord' ( gl_FragCoord 4-component vector of float FragCoord)
 0:?     'foo' ( smooth in 4-component vector of float)
@@ -330,6 +456,13 @@ ERROR: node is still EOpNull!
 0:?     'samp2DAs' ( uniform sampler2DArrayShadow)
 0:?     'sampBuf' ( uniform samplerBuffer)
 0:?     'sampRect' ( uniform sampler2DRect)
+0:?     'b1' ( global bool)
+0:?     'b2' ( global bool)
+0:?     'b' ( global bool)
+0:?     'x' ( global int)
+0:?     'y' ( global int)
+0:?     'z' ( global uint)
+0:?     'w' ( global uint)
 
 
 Linked fragment stage:
@@ -340,6 +473,7 @@ Requested GL_ARB_gpu_shader_fp64
 Requested GL_ARB_shader_bit_encoding
 Requested GL_ARB_shading_language_packing
 Requested GL_ARB_texture_query_lod
+Requested GL_EXT_shader_integer_mix
 gl_FragCoord pixel center is integer
 gl_FragCoord origin is upper left
 ERROR: node is still EOpNull!
@@ -415,4 +549,11 @@ ERROR: node is still EOpNull!
 0:?     'samp2DAs' ( uniform sampler2DArrayShadow)
 0:?     'sampBuf' ( uniform samplerBuffer)
 0:?     'sampRect' ( uniform sampler2DRect)
+0:?     'b1' ( global bool)
+0:?     'b2' ( global bool)
+0:?     'b' ( global bool)
+0:?     'x' ( global int)
+0:?     'y' ( global int)
+0:?     'z' ( global uint)
+0:?     'w' ( global uint)
 
diff --git a/Test/baseResults/300.frag.out b/Test/baseResults/300.frag.out
index ee1b8a55a9..0b88aa33b4 100644
--- a/Test/baseResults/300.frag.out
+++ b/Test/baseResults/300.frag.out
@@ -40,15 +40,17 @@ ERROR: 0:129: 'texel offset' : value is out of range: [gl_MinProgramTexelOffset,
 ERROR: 0:129: 'texel offset' : value is out of range: [gl_MinProgramTexelOffset, gl_MaxProgramTexelOffset]
 ERROR: 0:148: 'qualifier' : cannot use auxiliary, memory, interpolation, or precision qualifier in a default qualifier declaration (declaration with no type) 
 ERROR: 0:150: 'early_fragment_tests' : not supported for this version or the enabled extensions 
-ERROR: 0:156: 'invariant' : can only apply to an output 
-ERROR: 0:157: 'invariant' : can only apply to an output 
-ERROR: 0:158: 'invariant' : can only apply to an output 
-ERROR: 0:160: 'imageBuffer' : Reserved word. 
-ERROR: 0:160: '' :  syntax error, unexpected IMAGEBUFFER, expecting COMMA or SEMICOLON
-ERROR: 46 compilation errors.  No code generated.
+ERROR: 0:177: 'specific signature of builtin mix' : required extension not requested: GL_EXT_shader_integer_mix
+ERROR: 0:184: 'invariant' : can only apply to an output 
+ERROR: 0:185: 'invariant' : can only apply to an output 
+ERROR: 0:186: 'invariant' : can only apply to an output 
+ERROR: 0:188: 'imageBuffer' : Reserved word. 
+ERROR: 0:188: '' :  syntax error, unexpected IMAGEBUFFER, expecting COMMA or SEMICOLON
+ERROR: 47 compilation errors.  No code generated.
 
 
 Shader version: 300
+Requested GL_EXT_shader_integer_mix
 using early_fragment_tests
 ERROR: node is still EOpNull!
 0:53  Function Definition: main( ( global void)
@@ -362,6 +364,130 @@ ERROR: node is still EOpNull!
 0:145            21.000000
 0:145            22.000000
 0:145            33.000000
+0:158  Function Definition: testmix( ( global void)
+0:158    Function Parameters: 
+0:160    Sequence
+0:160      Sequence
+0:160        move second child to first child ( temp mediump int)
+0:160          'ival' ( temp mediump int)
+0:160          mix ( global mediump int)
+0:160            'x' ( global mediump int)
+0:160            'y' ( global mediump int)
+0:160            'b' ( global bool)
+0:161      Sequence
+0:161        move second child to first child ( temp mediump 2-component vector of int)
+0:161          'iv2' ( temp mediump 2-component vector of int)
+0:161          mix ( global mediump 2-component vector of int)
+0:161            Construct ivec2 ( temp mediump 2-component vector of int)
+0:161              'x' ( global mediump int)
+0:161            Construct ivec2 ( temp mediump 2-component vector of int)
+0:161              'y' ( global mediump int)
+0:161            Construct bvec2 ( temp 2-component vector of bool)
+0:161              'b' ( global bool)
+0:162      Sequence
+0:162        move second child to first child ( temp mediump 3-component vector of int)
+0:162          'iv3' ( temp mediump 3-component vector of int)
+0:162          mix ( global mediump 3-component vector of int)
+0:162            Construct ivec3 ( temp mediump 3-component vector of int)
+0:162              'x' ( global mediump int)
+0:162            Construct ivec3 ( temp mediump 3-component vector of int)
+0:162              'y' ( global mediump int)
+0:162            Construct bvec3 ( temp 3-component vector of bool)
+0:162              'b' ( global bool)
+0:163      Sequence
+0:163        move second child to first child ( temp mediump 4-component vector of int)
+0:163          'iv4' ( temp mediump 4-component vector of int)
+0:163          mix ( global mediump 4-component vector of int)
+0:163            Construct ivec4 ( temp mediump 4-component vector of int)
+0:163              'x' ( global mediump int)
+0:163            Construct ivec4 ( temp mediump 4-component vector of int)
+0:163              'x' ( global mediump int)
+0:163            Construct bvec4 ( temp 4-component vector of bool)
+0:163              'b' ( global bool)
+0:164      Sequence
+0:164        move second child to first child ( temp mediump uint)
+0:164          'uiv' ( temp mediump uint)
+0:164          mix ( global mediump uint)
+0:164            'z' ( global mediump uint)
+0:164            'w' ( global mediump uint)
+0:164            'b' ( global bool)
+0:165      Sequence
+0:165        move second child to first child ( temp mediump 2-component vector of uint)
+0:165          'uv2' ( temp mediump 2-component vector of uint)
+0:165          mix ( global mediump 2-component vector of uint)
+0:165            Construct uvec2 ( temp mediump 2-component vector of uint)
+0:165              'z' ( global mediump uint)
+0:165            Construct uvec2 ( temp mediump 2-component vector of uint)
+0:165              'z' ( global mediump uint)
+0:165            Construct bvec2 ( temp 2-component vector of bool)
+0:165              'b' ( global bool)
+0:166      Sequence
+0:166        move second child to first child ( temp mediump 3-component vector of uint)
+0:166          'uv3' ( temp mediump 3-component vector of uint)
+0:166          mix ( global mediump 3-component vector of uint)
+0:166            Construct uvec3 ( temp mediump 3-component vector of uint)
+0:166              'z' ( global mediump uint)
+0:166            Construct uvec3 ( temp mediump 3-component vector of uint)
+0:166              'z' ( global mediump uint)
+0:166            Construct bvec3 ( temp 3-component vector of bool)
+0:166              'b' ( global bool)
+0:167      Sequence
+0:167        move second child to first child ( temp mediump 4-component vector of uint)
+0:167          'uv4' ( temp mediump 4-component vector of uint)
+0:167          mix ( global mediump 4-component vector of uint)
+0:167            Construct uvec4 ( temp mediump 4-component vector of uint)
+0:167              'z' ( global mediump uint)
+0:167            Construct uvec4 ( temp mediump 4-component vector of uint)
+0:167              'z' ( global mediump uint)
+0:167            Construct bvec4 ( temp 4-component vector of bool)
+0:167              'b' ( global bool)
+0:168      Sequence
+0:168        move second child to first child ( temp bool)
+0:168          'bv' ( temp bool)
+0:168          mix ( global bool)
+0:168            'b1' ( global bool)
+0:168            'b2' ( global bool)
+0:168            'b' ( global bool)
+0:169      Sequence
+0:169        move second child to first child ( temp 2-component vector of bool)
+0:169          'bv2' ( temp 2-component vector of bool)
+0:169          mix ( global 2-component vector of bool)
+0:169            Construct bvec2 ( temp 2-component vector of bool)
+0:169              'b1' ( global bool)
+0:169            Construct bvec2 ( temp 2-component vector of bool)
+0:169              'b2' ( global bool)
+0:169            Construct bvec2 ( temp 2-component vector of bool)
+0:169              'b' ( global bool)
+0:170      Sequence
+0:170        move second child to first child ( temp 3-component vector of bool)
+0:170          'bv3' ( temp 3-component vector of bool)
+0:170          mix ( global 3-component vector of bool)
+0:170            Construct bvec3 ( temp 3-component vector of bool)
+0:170              'b1' ( global bool)
+0:170            Construct bvec3 ( temp 3-component vector of bool)
+0:170              'b2' ( global bool)
+0:170            Construct bvec3 ( temp 3-component vector of bool)
+0:170              'b' ( global bool)
+0:171      Sequence
+0:171        move second child to first child ( temp 4-component vector of bool)
+0:171          'bv4' ( temp 4-component vector of bool)
+0:171          mix ( global 4-component vector of bool)
+0:171            Construct bvec4 ( temp 4-component vector of bool)
+0:171              'b1' ( global bool)
+0:171            Construct bvec4 ( temp 4-component vector of bool)
+0:171              'b2' ( global bool)
+0:171            Construct bvec4 ( temp 4-component vector of bool)
+0:171              'b' ( global bool)
+0:175  Function Definition: testmixFail( ( global void)
+0:175    Function Parameters: 
+0:177    Sequence
+0:177      Sequence
+0:177        move second child to first child ( temp mediump int)
+0:177          'ival' ( temp mediump int)
+0:177          mix ( global mediump int)
+0:177            'x' ( global mediump int)
+0:177            'y' ( global mediump int)
+0:177            'b' ( global bool)
 0:?   Linker Objects
 0:?     's2D' ( uniform lowp sampler2D)
 0:?     's3D' ( uniform lowp sampler3D)
@@ -397,6 +523,13 @@ ERROR: node is still EOpNull!
 0:?     'colors' ( out 4-element array of lowp 4-component vector of float)
 0:?     'st1' ( uniform structure{ global mediump int i,  global lowp sampler2D s})
 0:?     'st2' ( uniform structure{ global mediump int i,  global lowp sampler2D s})
+0:?     'b1' ( global bool)
+0:?     'b2' ( global bool)
+0:?     'b' ( global bool)
+0:?     'x' ( global mediump int)
+0:?     'y' ( global mediump int)
+0:?     'z' ( global mediump uint)
+0:?     'w' ( global mediump uint)
 0:?     'fooinv' ( invariant smooth in lowp 4-component vector of float)
 
 
@@ -405,6 +538,7 @@ Linked fragment stage:
 ERROR: Linking fragment stage: when more than one fragment shader output, all must have location qualifiers
 
 Shader version: 300
+Requested GL_EXT_shader_integer_mix
 using early_fragment_tests
 ERROR: node is still EOpNull!
 0:53  Function Definition: main( ( global void)
@@ -628,5 +762,12 @@ ERROR: node is still EOpNull!
 0:?     'colors' ( out 4-element array of lowp 4-component vector of float)
 0:?     'st1' ( uniform structure{ global mediump int i,  global lowp sampler2D s})
 0:?     'st2' ( uniform structure{ global mediump int i,  global lowp sampler2D s})
+0:?     'b1' ( global bool)
+0:?     'b2' ( global bool)
+0:?     'b' ( global bool)
+0:?     'x' ( global mediump int)
+0:?     'y' ( global mediump int)
+0:?     'z' ( global mediump uint)
+0:?     'w' ( global mediump uint)
 0:?     'fooinv' ( invariant smooth in lowp 4-component vector of float)
 
diff --git a/Test/baseResults/spv.specConstant.vert.out b/Test/baseResults/spv.specConstant.vert.out
index ea24507869..206e30a385 100644
--- a/Test/baseResults/spv.specConstant.vert.out
+++ b/Test/baseResults/spv.specConstant.vert.out
@@ -11,7 +11,7 @@ spv.specConstant.vert
                               Source GLSL 400
                               Name 4  "main"
                               Name 9  "arraySize"
-                              Name 14  "foo(vf4[s4534];"
+                              Name 14  "foo(vf4[s4546];"
                               Name 13  "p"
                               Name 17  "builtin_spec_constant("
                               Name 20  "color"
@@ -102,10 +102,10 @@ spv.specConstant.vert
                               Store 20(color) 46
               48:          10 Load 22(ucol)
                               Store 47(param) 48
-              49:           2 FunctionCall 14(foo(vf4[s4534];) 47(param)
+              49:           2 FunctionCall 14(foo(vf4[s4546];) 47(param)
                               Return
                               FunctionEnd
-14(foo(vf4[s4534];):           2 Function None 12
+14(foo(vf4[s4546];):           2 Function None 12
            13(p):     11(ptr) FunctionParameter
               15:             Label
               54:     24(ptr) AccessChain 53(dupUcol) 23
diff --git a/glslang/MachineIndependent/Initialize.cpp b/glslang/MachineIndependent/Initialize.cpp
index c76c287f58..5410f82ac4 100644
--- a/glslang/MachineIndependent/Initialize.cpp
+++ b/glslang/MachineIndependent/Initialize.cpp
@@ -3060,6 +3060,24 @@ void TBuiltIns::initialize(int version, EProfile profile, const SpvVersion& spvV
             "\n");
     }
 
+    if ((profile == EEsProfile && version >= 300 && version < 310) ||
+        (profile != EEsProfile && version >= 150 && version < 450)) { // GL_EXT_shader_integer_mix
+        commonBuiltins.append("int mix(int, int, bool);"
+                              "ivec2 mix(ivec2, ivec2, bvec2);"
+                              "ivec3 mix(ivec3, ivec3, bvec3);"
+                              "ivec4 mix(ivec4, ivec4, bvec4);"
+                              "uint  mix(uint,  uint,  bool );"
+                              "uvec2 mix(uvec2, uvec2, bvec2);"
+                              "uvec3 mix(uvec3, uvec3, bvec3);"
+                              "uvec4 mix(uvec4, uvec4, bvec4);"
+                              "bool  mix(bool,  bool,  bool );"
+                              "bvec2 mix(bvec2, bvec2, bvec2);"
+                              "bvec3 mix(bvec3, bvec3, bvec3);"
+                              "bvec4 mix(bvec4, bvec4, bvec4);"
+
+                              "\n");
+    }
+
     // GL_AMD_gpu_shader_half_float/Explicit types
     if (profile != EEsProfile && version >= 450) {
         commonBuiltins.append(
diff --git a/glslang/MachineIndependent/ParseHelper.cpp b/glslang/MachineIndependent/ParseHelper.cpp
index 31b09f07cf..137cb5e380 100644
--- a/glslang/MachineIndependent/ParseHelper.cpp
+++ b/glslang/MachineIndependent/ParseHelper.cpp
@@ -2198,6 +2198,28 @@ void TParseContext::builtInOpCheck(const TSourceLoc& loc, const TFunction& fnCan
             memorySemanticsCheck(loc, fnCandidate, callNode);
         }
         break;
+
+    case EOpMix:
+        if (profile == EEsProfile && version < 310) {
+            // Look for specific signatures
+            if ((*argp)[0]->getAsTyped()->getBasicType() != EbtFloat &&
+                (*argp)[1]->getAsTyped()->getBasicType() != EbtFloat &&
+                (*argp)[2]->getAsTyped()->getBasicType() == EbtBool) {
+                requireExtensions(loc, 1, &E_GL_EXT_shader_integer_mix, "specific signature of builtin mix");
+            }
+        }
+
+        if (profile != EEsProfile && version < 450) {
+            if ((*argp)[0]->getAsTyped()->getBasicType() != EbtFloat && 
+                (*argp)[0]->getAsTyped()->getBasicType() != EbtDouble &&
+                (*argp)[1]->getAsTyped()->getBasicType() != EbtFloat &&
+                (*argp)[1]->getAsTyped()->getBasicType() != EbtDouble &&
+                (*argp)[2]->getAsTyped()->getBasicType() == EbtBool) {
+                requireExtensions(loc, 1, &E_GL_EXT_shader_integer_mix, fnCandidate.getName().c_str());
+            }
+        }
+
+        break;
 #endif
 
     default:
diff --git a/glslang/MachineIndependent/Versions.cpp b/glslang/MachineIndependent/Versions.cpp
index cdcba3b199..82ccabc6e5 100644
--- a/glslang/MachineIndependent/Versions.cpp
+++ b/glslang/MachineIndependent/Versions.cpp
@@ -297,6 +297,7 @@ void TParseVersions::initializeExtensionBehavior()
     extensionBehavior[E_GL_OES_tessellation_point_size]  = EBhDisable;
     extensionBehavior[E_GL_OES_texture_buffer]           = EBhDisable;
     extensionBehavior[E_GL_OES_texture_cube_map_array]   = EBhDisable;
+    extensionBehavior[E_GL_EXT_shader_integer_mix]       = EBhDisable;
 
     // EXT extensions
     extensionBehavior[E_GL_EXT_device_group]                = EBhDisable;
@@ -363,6 +364,7 @@ void TParseVersions::getPreamble(std::string& preamble)
             "#define GL_EXT_tessellation_point_size 1\n"
             "#define GL_EXT_texture_buffer 1\n"
             "#define GL_EXT_texture_cube_map_array 1\n"
+            "#define GL_EXT_shader_integer_mix 1\n"
 
             // OES matching AEP
             "#define GL_OES_geometry_shader 1\n"
diff --git a/glslang/MachineIndependent/Versions.h b/glslang/MachineIndependent/Versions.h
index f5ea06fb16..7a9e67319b 100644
--- a/glslang/MachineIndependent/Versions.h
+++ b/glslang/MachineIndependent/Versions.h
@@ -267,6 +267,7 @@ const char* const E_GL_EXT_tessellation_shader                  = "GL_EXT_tessel
 const char* const E_GL_EXT_tessellation_point_size              = "GL_EXT_tessellation_point_size";
 const char* const E_GL_EXT_texture_buffer                       = "GL_EXT_texture_buffer";
 const char* const E_GL_EXT_texture_cube_map_array               = "GL_EXT_texture_cube_map_array";
+const char* const E_GL_EXT_shader_integer_mix                   = "GL_EXT_shader_integer_mix"; 
 
 // OES matching AEP
 const char* const E_GL_OES_geometry_shader                      = "GL_OES_geometry_shader";