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192 lines
6.7 KiB
C++
192 lines
6.7 KiB
C++
//##################################################################################################
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//
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// Custom Visualization Core library
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// Copyright (C) 2011-2013 Ceetron AS
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//
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// This library may be used under the terms of either the GNU General Public License or
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// the GNU Lesser General Public License as follows:
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//
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// GNU General Public License Usage
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// This library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
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// for more details.
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//
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// GNU Lesser General Public License Usage
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
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// for more details.
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//
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//##################################################################################################
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#include "cvfBase.h"
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#include "cvfRenderStateDepth.h"
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#include "cvfAssert.h"
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#include "cvfOpenGL.h"
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namespace cvf {
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//==================================================================================================
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///
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/// \class cvf::RenderStateDepth
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/// \ingroup Render
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///
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/// Encapsulate OpenGL glEnable(GL_DEPTH_TEST), glDepthFunc() and glDepthMask() functions.
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///
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/// \sa http://www.opengl.org/sdk/docs/man/xhtml/glEnable.xml
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/// \sa http://www.opengl.org/sdk/docs/man/xhtml/glDepthFunc.xml
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/// \sa http://www.opengl.org/sdk/docs/man/xhtml/glDepthMask.xml
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///
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/// \todo
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/// Add support for glDepthRange() if needed.
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//==================================================================================================
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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RenderStateDepth::RenderStateDepth(bool depthTest, Function func, bool depthWrite)
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: RenderState(DEPTH)
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{
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m_enableDepthTest = depthTest;
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m_depthFunc = func;
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m_enableDepthWrite = depthWrite;
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}
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//--------------------------------------------------------------------------------------------------
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/// Specifies the depth comparison function.
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///
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/// \sa http://www.opengl.org/sdk/docs/man/xhtml/glDepthFunc.xml
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//--------------------------------------------------------------------------------------------------
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void RenderStateDepth::setFunction(Function func)
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{
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m_depthFunc = func;
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}
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//--------------------------------------------------------------------------------------------------
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/// Enable or disable depth testing and updating of the depth buffer.
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///
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/// \param enableTest Specify true to enable testing against and updating of depth buffer.
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///
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/// \sa http://www.opengl.org/sdk/docs/man/xhtml/glEnable.xml with GL_DEPTH_TEST
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///
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/// From OpenGL docs:
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/// If enabled, do depth comparisons and update the depth buffer. Note that even if the depth buffer
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/// exists and the depth mask is non-zero, the depth buffer is not updated if the depth test is disabled
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//--------------------------------------------------------------------------------------------------
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void RenderStateDepth::enableDepthTest(bool enableTest)
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{
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m_enableDepthTest = enableTest;
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}
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//--------------------------------------------------------------------------------------------------
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/// Enable or disable writing into the depth buffer
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///
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/// \param enableWrite Specify true to enable writing to depth buffer, false to disable. The default is true.
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///
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/// \sa http://www.opengl.org/sdk/docs/man/xhtml/glDepthMask.xml
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//--------------------------------------------------------------------------------------------------
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void RenderStateDepth::enableDepthWrite(bool enableWrite)
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{
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m_enableDepthWrite = enableWrite;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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RenderStateDepth::Function RenderStateDepth::function() const
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{
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return m_depthFunc;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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bool RenderStateDepth::isDepthTestEnabled() const
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{
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return m_enableDepthTest;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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bool RenderStateDepth::isDepthWriteEnabled() const
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{
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return m_enableDepthWrite;
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}
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//--------------------------------------------------------------------------------------------------
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/// Specify the depth setting to OpenGL.
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//--------------------------------------------------------------------------------------------------
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void RenderStateDepth::applyOpenGL(OpenGLContext* oglContext) const
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{
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if (m_enableDepthTest)
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{
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GLenum depthFuncOGL = depthFuncOpenGL();
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glDepthFunc(depthFuncOGL);
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GLboolean enableDepthWrite = m_enableDepthWrite ? static_cast<GLboolean>(GL_TRUE) : static_cast<GLboolean>(GL_FALSE);
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glDepthMask(enableDepthWrite);
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glEnable(GL_DEPTH_TEST);
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}
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else
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{
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glDisable(GL_DEPTH_TEST);
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}
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CVF_CHECK_OGL(oglContext);
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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cvfGLenum RenderStateDepth::depthFuncOpenGL() const
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{
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switch (m_depthFunc)
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{
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case NEVER: return GL_NEVER;
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case LESS: return GL_LESS;
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case EQUAL: return GL_EQUAL;
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case LEQUAL: return GL_LEQUAL;
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case GREATER: return GL_GREATER;
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case NOTEQUAL: return GL_NOTEQUAL;
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case GEQUAL: return GL_GEQUAL;
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case ALWAYS: return GL_ALWAYS;
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}
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CVF_FAIL_MSG("Unhandled depth func");
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return 0;
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}
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} // namespace cvf
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