mkxp/src/glstate.h

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/*
** 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"
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#include <stack>
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#include <assert.h>
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struct Config;
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template<typename T>
struct GLProperty
{
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~GLProperty()
{
assert(stack.size() == 0);
}
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void init(const T &value)
{
current = value;
apply(value);
}
void push() { stack.push(current); }
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void pop() { set(stack.top()); stack.pop(); }
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const T &get() { return current; }
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void set(const T &value)
{
if (value == current)
return;
init(value);
}
void pushSet(const T &value)
{
push();
set(value);
}
void refresh()
{
apply(current);
}
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private:
virtual void apply(const T &value) = 0;
T current;
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std::stack<T> stack;
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};
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 GLBlendMode : public GLProperty<BlendType>
{
void apply(const BlendType &value);
};
class GLBlend : public GLProperty<bool>
{
void apply(const bool &value);
};
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class GLViewport : public GLProperty<IntRect>
{
void apply(const IntRect &value);
};
class GLProgram : public GLProperty<unsigned int> /* GLuint */
{
void apply(const unsigned int &value);
};
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class GLState
{
public:
GLClearColor clearColor;
GLScissorBox scissorBox;
GLScissorTest scissorTest;
GLBlendMode blendMode;
GLBlend blend;
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GLViewport viewport;
GLProgram program;
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struct Caps
{
int maxTexSize;
Caps();
} caps;
GLState(const Config &conf);
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};
#endif // GLSTATE_H