Add object-oriented interfaces for the various tests and blending

[libs/gl.git] / source / tests.h

diff --git a/source/tests.h b/source/tests.h
index b906c0cec2afada2ba5ebb36adcf7ef53ede89a8..622834dcf888db6abb982abf1721a3291d8cc439 100644 (file)
--- a/source/tests.h
+++ b/source/tests.h
@@ -1,13 +1,14 @@
 /* $Id$
 
 This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
+Copyright © 2007, 2010  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
 #ifndef MSP_GL_TESTS_H_
 #define MSP_GL_TESTS_H_
 
+#include "bindable.h"
 #include "gl.h"
 #include "predicate.h"
 
@@ -21,12 +22,76 @@ enum
        DEPTH_TEST   = GL_DEPTH_TEST
 };
 
-void scissor(int left, int bottom, unsigned width, unsigned height);
+/**
+Tests incoming fragment alpha values against a reference.  If the test fails,
+the fragment is discarded.
+*/
+class AlphaTest: public Bindable<AlphaTest>
+{
+private:
+       Predicate pred;
+       float ref;
+
+public:
+       AlphaTest();
+       AlphaTest(Predicate, float);
+
+       void bind() const;
+
+       static void unbind();
+};
 
 void alpha_func(Predicate func, float ref);
 
+
+/**
+Tests incoming fragment depth values against the depth buffer.  If the test
+fails, the fragment is discarded.
+*/
+class DepthTest: public Bindable<DepthTest>
+{
+private:
+       bool write;
+       Predicate pred;
+
+       static const DepthTest *current; 
+
+public:
+       DepthTest();
+       DepthTest(Predicate, bool = true);
+
+       void bind() const;
+
+       static const DepthTest &lequal();
+       static void unbind();
+};
+
 void depth_func(Predicate func);
 
+
+/**
+Tests fragment coordinates against a rectangle.  Any fragments outside the
+rectangle are discarded.
+*/
+class ScissorTest: public Bindable<ScissorTest>
+{
+private:
+       int left;
+       int bottom;
+       unsigned width;
+       unsigned height;
+
+public:
+       ScissorTest();
+       ScissorTest(int, int, unsigned, unsigned);
+
+       void bind() const;
+
+       static void unbind();
+};
+
+void scissor(int left, int bottom, unsigned width, unsigned height);
+
 } // namespace GL
 } // namespace Msp