[core] Update line-pattern shader code/tests

Refs:
- mapbox-gl-test-suite: https://github.com/mapbox/mapbox-gl-test-suite/pull/107
- mapbox-gl-shaders: https://github.com/mapbox/mapbox-gl-shaders/pull/17
- mapbox-gl-js: https://github.com/mapbox/mapbox-gl-js/pull/2724

Part of https://github.com/mapbox/mapbox-gl-shaders/issues/1.

package.json

@@ -21,9 +21,9 @@
     "csscolorparser": "^1.0.2",
     "ejs": "^2.4.1",
     "express": "^4.11.1",
-    "mapbox-gl-shaders": "mapbox/mapbox-gl-shaders#30caf388dbddd02cfc4f967ffc94c1338c30fbf8",
+    "mapbox-gl-shaders": "mapbox/mapbox-gl-shaders#09ee512cd59a8fb1a241c78833b7c8022bf4f263",
     "mapbox-gl-style-spec": "mapbox/mapbox-gl-style-spec#2461efc3d883f2f2e56a6c6b2bfd7d54bbfe9f86",
-    "mapbox-gl-test-suite": "mapbox/mapbox-gl-test-suite#64cf15b657e12b070fede3f2fd3f5ac4fc096e5b",
+    "mapbox-gl-test-suite": "mapbox/mapbox-gl-test-suite#e78f09dce98080a9a6fa436d11fdf6fc2f271d7a",
     "node-gyp": "^3.3.1",
     "request": "^2.72.0",
     "tape": "^4.5.1"

src/mbgl/renderer/painter_line.cpp

@@ -53,9 +53,9 @@ void Painter::renderLine(LineBucket& bucket,
 
     // calculate how much longer the real world distance is at the top of the screen
     // than at the middle of the screen.
-    float topedgelength = std::sqrt(std::pow(state.getHeight(), 2) / 4  * (1 + std::pow(state.getAltitude(), 2)));
+    float topedgelength = std::sqrt(std::pow(state.getHeight(), 2.0f) / 4.0f  * (1.0f + std::pow(state.getAltitude(), 2.0f)));
     float x = state.getHeight() / 2.0f * std::tan(state.getPitch());
-    float extra = (topedgelength + x) / topedgelength - 1;
+    float extra = (topedgelength + x) / topedgelength - 1.0f;
 
     mat4 vtxMatrix =
         translatedMatrix(matrix, properties.lineTranslate, tileID, properties.lineTranslateAnchor);