Shaders: name the textureCoordinates attribute consistently in GLSL.

Interestingly enough, on Phong it was named textureCoords while on the
C++ side it was asking for textureCoordinates, and I don't remember this
being an issue *ever*, on any driver.

src/Magnum/Shaders/AbstractVector2D.vert

@@ -47,9 +47,9 @@ layout(location = TEXTURECOORDINATES_ATTRIBUTE_LOCATION)
 #endif
 in mediump vec2 textureCoordinates;
 
-out mediump vec2 fragmentTextureCoordinates;
+out mediump vec2 interpolatedTextureCoordinates;
 
 void main() {
     gl_Position.xywz = vec4(transformationProjectionMatrix*vec3(position, 1.0), 0.0);
-    fragmentTextureCoordinates = textureCoordinates;
+    interpolatedTextureCoordinates = textureCoordinates;
 }

src/Magnum/Shaders/AbstractVector3D.vert

@@ -47,9 +47,9 @@ layout(location = TEXTURECOORDINATES_ATTRIBUTE_LOCATION)
 #endif
 in mediump vec2 textureCoordinates;
 
-out mediump vec2 fragmentTextureCoordinates;
+out mediump vec2 interpolatedTextureCoordinates;
 
 void main() {
     gl_Position = transformationProjectionMatrix*position;
-    fragmentTextureCoordinates = textureCoordinates;
+    interpolatedTextureCoordinates = textureCoordinates;
 }

src/Magnum/Shaders/DistanceFieldVector.frag

@@ -67,7 +67,7 @@ layout(binding = 6)
 #endif
 uniform lowp sampler2D vectorTexture;
 
-in mediump vec2 fragmentTextureCoordinates;
+in mediump vec2 interpolatedTextureCoordinates;
 
 #ifdef NEW_GLSL
 #ifdef EXPLICIT_ATTRIB_LOCATION
@@ -77,7 +77,7 @@ out lowp vec4 fragmentColor;
 #endif
 
 void main() {
-    lowp float intensity = texture(vectorTexture, fragmentTextureCoordinates).r;
+    lowp float intensity = texture(vectorTexture, interpolatedTextureCoordinates).r;
 
     /* Fill color */
     fragmentColor = smoothstep(outlineRange.x-smoothness, outlineRange.x+smoothness, intensity)*color;

src/Magnum/Shaders/Phong.frag

@@ -146,7 +146,7 @@ in highp vec3 cameraDirection;
 #endif
 
 #if defined(AMBIENT_TEXTURE) || defined(DIFFUSE_TEXTURE) || defined(SPECULAR_TEXTURE) || defined(NORMAL_TEXTURE)
-in mediump vec2 interpolatedTextureCoords;
+in mediump vec2 interpolatedTextureCoordinates;
 #endif
 
 #ifdef VERTEX_COLOR
@@ -170,13 +170,13 @@ out highp uint fragmentObjectId;
 void main() {
     lowp const vec4 finalAmbientColor =
         #ifdef AMBIENT_TEXTURE
-        texture(ambientTexture, interpolatedTextureCoords)*
+        texture(ambientTexture, interpolatedTextureCoordinates)*
         #endif
         ambientColor;
     #if LIGHT_COUNT
     lowp const vec4 finalDiffuseColor =
         #ifdef DIFFUSE_TEXTURE
-        texture(diffuseTexture, interpolatedTextureCoords)*
+        texture(diffuseTexture, interpolatedTextureCoordinates)*
         #endif
         #ifdef VERTEX_COLOR
         interpolatedVertexColor*
@@ -184,7 +184,7 @@ void main() {
         diffuseColor;
     lowp const vec4 finalSpecularColor =
         #ifdef SPECULAR_TEXTURE
-        texture(specularTexture, interpolatedTextureCoords)*
+        texture(specularTexture, interpolatedTextureCoordinates)*
         #endif
         specularColor;
     #endif
@@ -203,7 +203,7 @@ void main() {
                         normalizedTransformedTangent)),
         normalizedTransformedNormal
     );
-    normalizedTransformedNormal = tbn*(texture(normalTexture, interpolatedTextureCoords).rgb*2.0 - vec3(1.0));
+    normalizedTransformedNormal = tbn*(texture(normalTexture, interpolatedTextureCoordinates).rgb*2.0 - vec3(1.0));
     #endif
 
     /* Add diffuse color for each light */

src/Magnum/Shaders/Phong.vert

@@ -88,9 +88,9 @@ in mediump vec3 tangent;
 #ifdef EXPLICIT_ATTRIB_LOCATION
 layout(location = TEXTURECOORDINATES_ATTRIBUTE_LOCATION)
 #endif
-in mediump vec2 textureCoords;
+in mediump vec2 textureCoordinates;
 
-out mediump vec2 interpolatedTextureCoords;
+out mediump vec2 interpolatedTextureCoordinates;
 #endif
 
 #ifdef VERTEX_COLOR
@@ -136,7 +136,7 @@ void main() {
 
     #ifdef TEXTURED
     /* Texture coordinates, if needed */
-    interpolatedTextureCoords = textureCoords;
+    interpolatedTextureCoordinates = textureCoordinates;
     #endif
 
     #ifdef VERTEX_COLOR

src/Magnum/Shaders/Vector.frag

@@ -49,7 +49,7 @@ layout(binding = 6)
 #endif
 uniform lowp sampler2D vectorTexture;
 
-in mediump vec2 fragmentTextureCoordinates;
+in mediump vec2 interpolatedTextureCoordinates;
 
 #ifdef NEW_GLSL
 #ifdef EXPLICIT_ATTRIB_LOCATION
@@ -59,6 +59,6 @@ out lowp vec4 fragmentColor;
 #endif
 
 void main() {
-    lowp float intensity = texture(vectorTexture, fragmentTextureCoordinates).r;
+    lowp float intensity = texture(vectorTexture, interpolatedTextureCoordinates).r;
     fragmentColor = mix(backgroundColor, color, intensity);
 }