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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#ifndef INCLUDED_VCL_INC_OPENGL_RENDER_STATE_H
#define INCLUDED_VCL_INC_OPENGL_RENDER_STATE_H
#include <opengl/TextureState.hxx>
template<GLenum ENUM_TYPE, typename TYPE>
class GenericCapabilityState
{
protected:
bool mbTest;
GenericCapabilityState()
: mbTest(false)
{
}
static bool readState()
{
return glIsEnabled(ENUM_TYPE);
}
public:
void sync()
{
mbTest = readState();
}
void enable()
{
if (!mbTest)
{
glEnable(ENUM_TYPE);
CHECK_GL_ERROR();
mbTest = true;
}
else
{
VCL_GL_INFO(TYPE::className() << ": enable called but already enabled");
}
#ifdef DBG_UTIL
checkState();
#endif
}
void disable()
{
if (mbTest)
{
glDisable(ENUM_TYPE);
CHECK_GL_ERROR();
mbTest = false;
}
else
{
VCL_GL_INFO(TYPE::className() << ": disable called but already disabled");
}
#ifdef DBG_UTIL
checkState();
#endif
}
#ifdef DBG_UTIL
void checkState()
{
bool bRealState = readState();
if (mbTest != bRealState)
{
VCL_GL_INFO(TYPE::className() << " mismatch! "
<< "Expected: " << (mbTest ? "enabled" : "disabled")
<< " but is: " << (bRealState ? "enabled" : "disabled"));
}
}
#endif
};
class ScissorState : public GenericCapabilityState<GL_SCISSOR_TEST, ScissorState>
{
private:
int mX;
int mY;
int mWidth;
int mHeight;
public:
static std::string className() { return std::string("ScissorState"); }
ScissorState()
: mX(0)
, mY(0)
, mWidth(0)
, mHeight(0)
{}
void set(int x, int y, int width, int height)
{
if (x != mX || y != mY || width != mWidth || height != mHeight)
{
glScissor(x, y, width, height);
CHECK_GL_ERROR();
mX = x;
mY = y;
mWidth = width;
mHeight = height;
}
}
};
class StencilState : public GenericCapabilityState<GL_STENCIL_TEST, StencilState>
{
public:
static std::string className() { return std::string("StencilState"); }
};
class BlendState : public GenericCapabilityState<GL_BLEND, BlendState>
{
GLenum mnSourceMode;
GLenum mnDestinationMode;
public:
BlendState()
: mnSourceMode(GL_ZERO)
, mnDestinationMode(GL_ZERO)
{}
static std::string className() { return std::string("BlendState"); }
void func(GLenum nSource, GLenum nDestination)
{
if (mnSourceMode != nSource || mnDestinationMode != nDestination)
{
glBlendFunc(nSource, nDestination);
CHECK_GL_ERROR();
mnSourceMode = nSource;
mnDestinationMode = nDestination;
}
}
};
class RenderState
{
TextureState maTexture;
ScissorState maScissor;
StencilState maStencil;
BlendState maBlend;
tools::Rectangle maCurrentViewport;
public:
RenderState()
{}
void viewport(tools::Rectangle aViewPort)
{
if (aViewPort != maCurrentViewport)
{
glViewport(aViewPort.Left(), aViewPort.Top(), aViewPort.GetWidth(), aViewPort.GetHeight());
CHECK_GL_ERROR();
maCurrentViewport = aViewPort;
}
}
TextureState& texture() { return maTexture; }
ScissorState& scissor() { return maScissor; }
StencilState& stencil() { return maStencil; }
BlendState& blend() { return maBlend; }
void sync()
{
VCL_GL_INFO("RenderState::sync");
maScissor.sync();
maStencil.sync();
maBlend.sync();
}
};
#endif // INCLUDED_VCL_INC_OPENGL_RENDER_STATE_H
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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