Bug 1270318 - Fixup WebGL extension requirements. - r=jrmuizel

dom/canvas/WebGL2Context.cpp

@@ -71,7 +71,7 @@ static const gl::GLFeature kRequiredFeatures[] = {
     gl::GLFeature::gpu_shader4,
     gl::GLFeature::instanced_arrays,
     gl::GLFeature::instanced_non_arrays,
-    gl::GLFeature::map_buffer_range,
+    gl::GLFeature::map_buffer_range, // Used by GetBufferSubData.
     gl::GLFeature::occlusion_query2,
     gl::GLFeature::packed_depth_stencil,
     gl::GLFeature::query_objects,
@@ -85,7 +85,6 @@ static const gl::GLFeature kRequiredFeatures[] = {
     gl::GLFeature::texture_3D_compressed,
     gl::GLFeature::texture_3D_copy,
     gl::GLFeature::texture_float,
-    gl::GLFeature::texture_float_linear,
     gl::GLFeature::texture_half_float,
     gl::GLFeature::texture_half_float_linear,
     gl::GLFeature::texture_non_power_of_two,

dom/canvas/WebGLContextExtensions.cpp

@@ -120,8 +120,6 @@ WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
     // OES_
     case WebGLExtensionID::OES_texture_float_linear:
         return gl->IsSupported(gl::GLFeature::texture_float_linear);
-    case WebGLExtensionID::OES_texture_half_float_linear:
-        return gl->IsSupported(gl::GLFeature::texture_half_float_linear);
 
     // WEBGL_
     case WebGLExtensionID::WEBGL_color_buffer_float:
@@ -189,6 +187,8 @@ WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
             return WebGLExtensionTextureFloat::IsSupported(this);
         case WebGLExtensionID::OES_texture_half_float:
             return WebGLExtensionTextureHalfFloat::IsSupported(this);
+        case WebGLExtensionID::OES_texture_half_float_linear:
+            return gl->IsSupported(gl::GLFeature::texture_half_float_linear);
 
         case WebGLExtensionID::OES_vertex_array_object:
             return true;

gfx/gl/GLContextFeatures.cpp

@@ -511,6 +511,7 @@ static const FeatureInfo sFeatureInfoArr[] = {
         GLContext::Extension_None,
         {
             GLContext::ARB_texture_float,
+            GLContext::EXT_color_buffer_float,
             GLContext::EXT_color_buffer_half_float,
             GLContext::Extensions_End
         }