Initial commit

src/glstate.h

@@ -0,0 +1,145 @@
+/*
+** glstate.h
+**
+** This file is part of mkxp.
+**
+** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
+**
+** mkxp is free software: you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation, either version 2 of the License, or
+** (at your option) any later version.
+**
+** mkxp is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with mkxp.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef GLSTATE_H
+#define GLSTATE_H
+
+#include "etc.h"
+#include <QStack>
+
+template<typename T>
+struct GLProperty
+{
+	void init(const T &value)
+	{
+		current = value;
+		apply(value);
+	}
+
+	void push() { stack.push(current); }
+	void pop()  { set(stack.pop()); }
+	T &get()    { return current; }
+	void set(const T &value)
+	{
+		if (value == current)
+			return;
+
+		init(value);
+	}
+
+	void pushSet(const T &value)
+	{
+		push();
+		set(value);
+	}
+
+private:
+	virtual void apply(const T &value) = 0;
+
+	T current;
+	QStack<T> stack;
+};
+
+// Not needed
+template<typename T>
+struct GLPropSaver
+{
+	GLPropSaver(GLProperty<T> &p)
+	    : p(p)
+	{
+		p.push();
+	}
+
+	~GLPropSaver()
+	{
+		p.pop();
+	}
+
+private:
+	GLProperty<T> &p;
+};
+
+
+class GLClearColor : public GLProperty<Vec4>
+{
+	void apply(const Vec4 &);
+};
+
+class GLScissorBox : public GLProperty<IntRect>
+{
+public:
+	/* Sets the intersection of the current box with value */
+	void setIntersect(const IntRect &value);
+
+private:
+	void apply(const IntRect &value);
+};
+
+class GLScissorTest : public GLProperty<bool>
+{
+	void apply(const bool &value);
+};
+
+class GLTexture2D : public GLProperty<bool>
+{
+	void apply(const bool &value);
+};
+
+class GLBlendMode : public GLProperty<BlendType>
+{
+	void apply(const BlendType &value);
+};
+
+class GLViewport : public GLProperty<IntRect>
+{
+	void apply(const IntRect &value);
+};
+
+
+class GLState
+{
+public:
+	GLClearColor clearColor;
+	GLScissorBox scissorBox;
+	GLScissorTest scissorTest;
+	GLTexture2D texture2D;
+	GLBlendMode blendMode;
+	GLViewport viewport;
+
+	/* These functions pushSet/pop both the viewport
+	 * and a glOrtho projection matrix.
+	 * Useful for setting up rendering to FBOs of differing sizes */
+	void setViewport(int width, int height);
+	void pushSetViewport(int width, int height);
+	void popViewport();
+
+	struct Caps
+	{
+		int maxTexSize;
+
+		Caps();
+
+	} caps;
+
+	GLState();
+};
+
+#endif // GLSTATE_H