Bug 1306172 - Don't pass LINE_WIDTH>1.0 to core profiles. - r=jerry

dom/canvas/WebGLContext.h

@@ -1523,6 +1523,8 @@ protected:
     GLsizei mViewportHeight;
     bool mAlreadyWarnedAboutViewportLargerThanDest;
 
+    GLfloat mLineWidth;
+
     WebGLContextLossHandler mContextLossHandler;
     bool mAllowContextRestore;
     bool mLastLossWasSimulated;

dom/canvas/WebGLContextGL.cpp

@@ -2408,6 +2408,12 @@ WebGLContext::LineWidth(GLfloat width)
         return;
     }
 
+    mLineWidth = width;
+
+    if (gl->IsCoreProfile() && width > 1.0) {
+        width = 1.0;
+    }
+
     MakeContextCurrent();
     gl->fLineWidth(width);
 }

dom/canvas/WebGLContextState.cpp

@@ -509,8 +509,10 @@ WebGLContext::GetParameter(JSContext* cx, GLenum pname, ErrorResult& rv)
             return JS::DoubleValue(mStencilWriteMaskFront);
 
         // float
-        case LOCAL_GL_DEPTH_CLEAR_VALUE:
         case LOCAL_GL_LINE_WIDTH:
+            return JS::DoubleValue(mLineWidth);
+
+        case LOCAL_GL_DEPTH_CLEAR_VALUE:
         case LOCAL_GL_POLYGON_OFFSET_FACTOR:
         case LOCAL_GL_POLYGON_OFFSET_UNITS:
         case LOCAL_GL_SAMPLE_COVERAGE_VALUE: {

dom/canvas/WebGLContextValidate.cpp

@@ -672,6 +672,8 @@ WebGLContext::InitAndValidateGL(FailureReason* const out_failReason)
     mStencilRefFront = 0;
     mStencilRefBack = 0;
 
+    mLineWidth = 1.0;
+
     /*
     // Technically, we should be setting mStencil[...] values to
     // `allOnes`, but either ANGLE breaks or the SGX540s on Try break.