Texturing support for RECTANGLE textures.

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index ddc52cc378196c77fcf852090dd935df4a3a2520..5af15102b95f9004701aa5e62d0c18ca90dc6e20 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -220,9 +220,13 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
         }
     }
 
-    if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(3, 2)) ||
+    if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(3, 1)) ||
         ctxInfo.hasExtension("GL_ARB_texture_rectangle")) {
-        fRectangleTextureSupport = true;
+        // We also require textureSize() support for rectangle 2D samplers which was added in GLSL
+        // 1.40.
+        if (ctxInfo.glslGeneration() >= k140_GrGLSLGeneration) {
+            fRectangleTextureSupport = true;
+        }
     }
 
     if (kGL_GrGLStandard == standard) {