[core] Added PixelZoom, RasterPos to GL config

include/mbgl/gl/gl_values.hpp

@@ -269,6 +269,10 @@ struct PixelZoom {
     }
 };
 
+inline bool operator!=(const PixelZoom::Type& a, const PixelZoom::Type& b) {
+    return a.xfactor != b.xfactor || a.yfactor != b.yfactor;
+}
+
 struct RasterPos {
     using Type = std::array<GLdouble, 4>;
     static const Type Default;

src/mbgl/gl/gl_config.cpp

@@ -21,5 +21,10 @@ const Program::Type Program::Default = 0;
 const LineWidth::Type LineWidth::Default = 1;
 const ActiveTexture::Type ActiveTexture::Default = GL_TEXTURE0;
 
+#ifndef GL_ES_VERSION_2_0
+const PixelZoom::Type PixelZoom::Default = { 1, 1 };
+const RasterPos::Type RasterPos::Default = {{ 0, 0, 0, 0 }};
+#endif // GL_ES_VERSION_2_0
+
 } // namespace gl
 } // namespace mbgl

src/mbgl/gl/gl_config.hpp

@@ -56,6 +56,10 @@ public:
         program.reset();
         lineWidth.reset();
         activeTexture.reset();
+#ifndef GL_ES_VERSION_2_0
+        pixelZoom.reset();
+        rasterPos.reset();
+#endif // GL_ES_VERSION_2_0
     }
 
     void setDirty() {
@@ -76,6 +80,10 @@ public:
         program.setDirty();
         lineWidth.setDirty();
         activeTexture.setDirty();
+#ifndef GL_ES_VERSION_2_0
+        pixelZoom.setDirty();
+        rasterPos.setDirty();
+#endif // GL_ES_VERSION_2_0
     }
 
     Value<StencilFunc> stencilFunc;
@@ -95,6 +103,10 @@ public:
     Value<Program> program;
     Value<LineWidth> lineWidth;
     Value<ActiveTexture> activeTexture;
+#ifndef GL_ES_VERSION_2_0
+    Value<PixelZoom> pixelZoom;
+    Value<RasterPos> rasterPos;
+#endif // GL_ES_VERSION_2_0
 };
 
 } // namespace gl