diff --git a/libraries/gpu/src/gpu/DrawColoredTexture.slf b/libraries/gpu/src/gpu/DrawColoredTexture.slf
index 5460cf56eb..2a7f6aae36 100755
--- a/libraries/gpu/src/gpu/DrawColoredTexture.slf
+++ b/libraries/gpu/src/gpu/DrawColoredTexture.slf
@@ -11,13 +11,13 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-
+
 uniform sampler2D colorMap;
 uniform vec4 color;
 
-in vec2 varTexcoord;
+in vec2 varTexCoord0;
 out vec4 outFragColor;
 
 void main(void) {
-    outFragColor = texture(colorMap, varTexcoord) * color;
+    outFragColor = texture(colorMap, varTexCoord0) * color;
 }
diff --git a/libraries/gpu/src/gpu/DrawTexcoordRectTransformUnitQuad.slv b/libraries/gpu/src/gpu/DrawTexcoordRectTransformUnitQuad.slv
index e0ca81cb61..c9cc9e9dfa 100755
--- a/libraries/gpu/src/gpu/DrawTexcoordRectTransformUnitQuad.slv
+++ b/libraries/gpu/src/gpu/DrawTexcoordRectTransformUnitQuad.slv
@@ -13,27 +13,27 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-<@include gpu/Transform.slh@>
-
+<@include gpu/Transform.slh@>
+
 <$declareStandardTransform()$>
 
 uniform vec4 texcoordRect;
 
-out vec2 varTexcoord;
+out vec2 varTexCoord0;
 
 void main(void) {
-    const vec4 UNIT_QUAD[4] = vec4[4](
-        vec4(-1.0, -1.0, 0.0, 1.0),
-        vec4(1.0, -1.0, 0.0, 1.0),
-        vec4(-1.0, 1.0, 0.0, 1.0),
+    const vec4 UNIT_QUAD[4] = vec4[4](
+        vec4(-1.0, -1.0, 0.0, 1.0),
+        vec4(1.0, -1.0, 0.0, 1.0),
+        vec4(-1.0, 1.0, 0.0, 1.0),
         vec4(1.0, 1.0, 0.0, 1.0)
     );
     vec4 pos = UNIT_QUAD[gl_VertexID];
-
-    // standard transform
-    TransformCamera cam = getTransformCamera();
-    TransformObject obj = getTransformObject();
-    <$transformModelToClipPos(cam, obj, pos, gl_Position)$>
-
-    varTexcoord = ((pos.xy + 1) * 0.5) * texcoordRect.zw + texcoordRect.xy;
+
+    // standard transform
+    TransformCamera cam = getTransformCamera();
+    TransformObject obj = getTransformObject();
+    <$transformModelToClipPos(cam, obj, pos, gl_Position)$>
+
+    varTexCoord0 = ((pos.xy + 1) * 0.5) * texcoordRect.zw + texcoordRect.xy;
 }
diff --git a/libraries/gpu/src/gpu/DrawTexture.slf b/libraries/gpu/src/gpu/DrawTexture.slf
index cfa18abc27..64389f02b3 100755
--- a/libraries/gpu/src/gpu/DrawTexture.slf
+++ b/libraries/gpu/src/gpu/DrawTexture.slf
@@ -11,12 +11,12 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-
+
 uniform sampler2D colorMap;
 
-in vec2 varTexcoord;
+in vec2 varTexCoord0;
 out vec4 outFragColor;
 
 void main(void) {
-    outFragColor = texture(colorMap, varTexcoord);
+    outFragColor = texture(colorMap, varTexCoord0);
 }
diff --git a/libraries/gpu/src/gpu/DrawTextureOpaque.slf b/libraries/gpu/src/gpu/DrawTextureOpaque.slf
index b6539e7de2..14d2072ff3 100755
--- a/libraries/gpu/src/gpu/DrawTextureOpaque.slf
+++ b/libraries/gpu/src/gpu/DrawTextureOpaque.slf
@@ -12,12 +12,12 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-
+
 uniform sampler2D colorMap;
 
-in vec2 varTexcoord;
+in vec2 varTexCoord0;
 out vec4 outFragColor;
 
 void main(void) {
-    outFragColor = vec4(texture(colorMap, varTexcoord).xyz, 1.0);
+    outFragColor = vec4(texture(colorMap, varTexCoord0).xyz, 1.0);
 }
diff --git a/libraries/gpu/src/gpu/DrawTransformUnitQuad.slv b/libraries/gpu/src/gpu/DrawTransformUnitQuad.slv
index 24e0cc25f3..f55abf1089 100755
--- a/libraries/gpu/src/gpu/DrawTransformUnitQuad.slv
+++ b/libraries/gpu/src/gpu/DrawTransformUnitQuad.slv
@@ -12,25 +12,25 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-<@include gpu/Transform.slh@>
-
+<@include gpu/Transform.slh@>
+
 <$declareStandardTransform()$>
 
-out vec2 varTexcoord;
+out vec2 varTexCoord0;
 
 void main(void) {
-    const vec4 UNIT_QUAD[4] = vec4[4](
-        vec4(-1.0, -1.0, 0.0, 1.0),
-        vec4(1.0, -1.0, 0.0, 1.0),
-        vec4(-1.0, 1.0, 0.0, 1.0),
+    const vec4 UNIT_QUAD[4] = vec4[4](
+        vec4(-1.0, -1.0, 0.0, 1.0),
+        vec4(1.0, -1.0, 0.0, 1.0),
+        vec4(-1.0, 1.0, 0.0, 1.0),
         vec4(1.0, 1.0, 0.0, 1.0)
     );
     vec4 pos = UNIT_QUAD[gl_VertexID];
-
-    // standard transform
-    TransformCamera cam = getTransformCamera();
-    TransformObject obj = getTransformObject();
-    <$transformModelToClipPos(cam, obj, pos, gl_Position)$>
-
-    varTexcoord = (pos.xy + 1) * 0.5;
+
+    // standard transform
+    TransformCamera cam = getTransformCamera();
+    TransformObject obj = getTransformObject();
+    <$transformModelToClipPos(cam, obj, pos, gl_Position)$>
+
+    varTexCoord0 = (pos.xy + 1) * 0.5;
 }
diff --git a/libraries/gpu/src/gpu/DrawViewportQuadTransformTexcoord.slv b/libraries/gpu/src/gpu/DrawViewportQuadTransformTexcoord.slv
index 81af3ffaf8..1f9bc13700 100755
--- a/libraries/gpu/src/gpu/DrawViewportQuadTransformTexcoord.slv
+++ b/libraries/gpu/src/gpu/DrawViewportQuadTransformTexcoord.slv
@@ -16,7 +16,7 @@
 
 <$declareStandardTransform()$>
 
-out vec2 varTexcoord;
+out vec2 varTexCoord0;
 
 void main(void) {
     const vec4 UNIT_QUAD[4] = vec4[4](
@@ -34,5 +34,5 @@ void main(void) {
     <$transformModelToWorldPos(obj, tc, tc)$>
 
     gl_Position = pos;
-    varTexcoord = tc.xy;
+    varTexCoord0 = tc.xy;
 }
diff --git a/libraries/gpu/src/gpu/GLBackendInput.cpp b/libraries/gpu/src/gpu/GLBackendInput.cpp
index 9014024914..9a99a912a4 100755
--- a/libraries/gpu/src/gpu/GLBackendInput.cpp
+++ b/libraries/gpu/src/gpu/GLBackendInput.cpp
@@ -57,7 +57,10 @@ void GLBackend::do_setInputBuffer(Batch& batch, uint32 paramOffset) {
     }
 }
 
-#define NOT_SUPPORT_VAO
+#if (GPU_FEATURE_PROFILE == GPU_CORE)
+#define SUPPORT_VAO
+#endif
+
 #if defined(SUPPORT_VAO)
 #else
 
@@ -95,8 +98,10 @@ void GLBackend::killInput() {
 
 void GLBackend::syncInputStateCache() {
 #if defined(SUPPORT_VAO)
-    for (int i = 0; i < NUM_CLASSIC_ATTRIBS; i++) {
-        _input._attributeActivation[i] = glIsEnabled(attributeSlotToClassicAttribName[i]);
+    for (int i = 0; i < _input._attributeActivation.size(); i++) {
+        GLint active = 0;
+        glGetVertexAttribiv(i, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &active);
+        _input._attributeActivation[i] = active;
     }
     //_input._defaultVAO
     glBindVertexArray(_input._defaultVAO);
diff --git a/libraries/render-utils/src/simple_textured_emisive.slf b/libraries/render-utils/src/simple_textured_emisive.slf
index dd0df6ba8b..96119e98f0 100644
--- a/libraries/render-utils/src/simple_textured_emisive.slf
+++ b/libraries/render-utils/src/simple_textured_emisive.slf
@@ -19,8 +19,8 @@ uniform sampler2D originalTexture;
 
 // the interpolated normal
 in vec3 _normal;
-in vec4 _texCoord0;
-in vec4 _color;
+in vec3 _color;
+in vec2 _texCoord0;
 
 void main(void) {
     vec4 texel = texture(originalTexture, _texCoord0.st);
diff --git a/libraries/render-utils/src/standardDrawTexture.slf b/libraries/render-utils/src/standardDrawTexture.slf
index f3492c2959..b79b560556 100644
--- a/libraries/render-utils/src/standardDrawTexture.slf
+++ b/libraries/render-utils/src/standardDrawTexture.slf
@@ -14,18 +14,18 @@
 // the texture
 uniform sampler2D colorMap;
 
-in vec3 _position;
-in vec3 _normal;
-in vec2 _texCoord0;
-in vec4 _color;
+in vec3 varPosition;
+in vec3 varNormal;
+in vec2 varTexCoord0;
+in vec4 varColor;
 
-out vec4 _fragColor;
+out vec4 outFragColor;
 
 void main(void) {
-    vec4 color = texture(colorMap, _texCoord0);
+    vec4 color = texture(colorMap, varTexCoord0);
     // FIXME CORE this isn't working
     //_fragColor = color * _color;
     //_fragColor = vec4(color.rgb, color.a * _color.a);
     //_fragColor = vec4(color.rgb * _color.rgb, color.a);
-    _fragColor = color;
+    outFragColor = color;
 }
diff --git a/libraries/render-utils/src/standardTransformPNTC.slv b/libraries/render-utils/src/standardTransformPNTC.slv
index d3429a1603..340dfd9c8e 100644
--- a/libraries/render-utils/src/standardTransformPNTC.slv
+++ b/libraries/render-utils/src/standardTransformPNTC.slv
@@ -18,19 +18,19 @@
 
 <$declareStandardTransform()$>
 
-out vec3 _position;
-out vec3 _normal;
-out vec2 _texCoord0;
-out vec4 _color;
+out vec3 varPosition;
+out vec3 varNormal;
+out vec2 varTexCoord0;
+out vec4 varColor;
 
 void main(void) {
-    _texCoord0 = inTexCoord0.st;
-    _color = inColor;
+    varTexCoord0 = inTexCoord0.st;
+    varColor = inColor;
     
     // standard transform
     TransformCamera cam = getTransformCamera();
     TransformObject obj = getTransformObject();
     <$transformModelToClipPos(cam, obj, inPosition, gl_Position)$>
-    <$transformModelToEyeDir(cam, obj, inNormal.xyz, _normal)$>
-    _position = inPosition.xyz;
+    <$transformModelToEyeDir(cam, obj, inNormal.xyz, varNormal)$>
+    varPosition = inPosition.xyz;
 }
\ No newline at end of file