cogl-pipeline: Add getters for the alpha test state

This adds two public functions:

 cogl_pipeline_get_alpha_test_function
   and
 cogl_pipeline_get_alpha_test_reference.

cogl/cogl-pipeline.c

@@ -3920,6 +3920,31 @@ cogl_pipeline_set_alpha_test_function (CoglPipeline *pipeline,
   _cogl_pipeline_set_alpha_test_function_reference (pipeline, alpha_reference);
 }
 
+CoglPipelineAlphaFunc
+cogl_pipeline_get_alpha_test_function (CoglPipeline *pipeline)
+{
+  CoglPipeline *authority;
+
+  g_return_val_if_fail (cogl_is_pipeline (pipeline), 0);
+
+  authority =
+    _cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_ALPHA_FUNC);
+
+  return authority->big_state->alpha_state.alpha_func;
+}
+
+float
+cogl_pipeline_get_alpha_test_reference (CoglPipeline *pipeline)
+{
+  CoglPipeline *authority;
+
+  g_return_val_if_fail (cogl_is_pipeline (pipeline), 0.0f);
+
+  authority =
+    _cogl_pipeline_get_authority (pipeline,
+                                  COGL_PIPELINE_STATE_ALPHA_FUNC_REFERENCE);
+
+  return authority->big_state->alpha_state.alpha_func_reference;
 }
 
 GLenum

cogl/cogl-pipeline.h

@@ -475,6 +475,28 @@ cogl_pipeline_set_alpha_test_function (CoglPipeline         *pipeline,
 				       CoglPipelineAlphaFunc alpha_func,
 				       float                 alpha_reference);
 
+/**
+ * cogl_pipeline_get_alpha_test_function:
+ * @pipeline: A #CoglPipeline object
+ *
+ * Return value: The alpha test function of @pipeline.
+ *
+ * Since: 2.0
+ */
+CoglPipelineAlphaFunc
+cogl_pipeline_get_alpha_test_function (CoglPipeline *pipeline);
+
+/**
+ * cogl_pipeline_get_alpha_test_reference:
+ * @pipeline: A #CoglPipeline object
+ *
+ * Return value: The alpha test reference value of @pipeline.
+ *
+ * Since: 2.0
+ */
+float
+cogl_pipeline_get_alpha_test_reference (CoglPipeline *pipeline);
+
 /**
  * cogl_pipeline_set_blend:
  * @pipeline: A #CoglPipeline object