125 lines
4.8 KiB
C++
125 lines
4.8 KiB
C++
/***********************************************************************
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* Copyright 2011-2012 Computer Graphics Group RWTH Aachen University. *
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* All rights reserved. *
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* Distributed under the terms of the MIT License (see LICENSE.TXT). *
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**********************************************************************/
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#ifndef ACGL_OPENGL_OBJECTS_RENDERBUFFER_HH
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#define ACGL_OPENGL_OBJECTS_RENDERBUFFER_HH
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/**
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* An OpenGL RenderBuffer that can be used with FBOs.
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*
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* A RenderBuffer is an alternative to a texture as a render target if the later
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* usage as a texture is not needed (e.g. as a depth attachment if only the
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* color attachments are needed from the offscreen renderpass).
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*/
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#include <ACGL/ACGL.hh>
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#include <ACGL/Base/Macros.hh>
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#include <ACGL/OpenGL/GL.hh>
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#include <ACGL/OpenGL/Tools.hh>
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#include <ACGL/Math/Math.hh>
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namespace ACGL{
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namespace OpenGL{
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class RenderBuffer
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{
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ACGL_NOT_COPYABLE(RenderBuffer)
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// ========================================================================================================= \/
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// ============================================================================================ CONSTRUCTORS \/
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// ========================================================================================================= \/
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public:
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RenderBuffer(
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GLenum _internalFormat)
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: mObjectName(0),
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mInternalFormat(_internalFormat),
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mWidth(0),
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mHeight(0)
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{
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mObjectName = 0;
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glGenRenderbuffers(1, &mObjectName);
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}
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virtual ~RenderBuffer(void)
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{
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// buffer 0 will get ignored by OpenGL
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glDeleteRenderbuffers(1, &mObjectName);
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}
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// ==================================================================================================== \/
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// ============================================================================================ GETTERS \/
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// ==================================================================================================== \/
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public:
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inline GLuint getObjectName (void) const { return mObjectName; }
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inline GLenum getInternalFormat (void) const { return mInternalFormat; }
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inline GLsizei getWidth (void) const { return mWidth; }
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inline GLsizei getHeight (void) const { return mHeight; }
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inline glm::uvec2 getSize (void) const { return glm::uvec2( mWidth, mHeight ); }
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// ==================================================================================================== \/
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// ============================================================================================ METHODS \/
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// ==================================================================================================== \/
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public:
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//! Get the actual number of samples
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#ifdef ACGL_OPENGL_ES
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inline int_t getSamples(void) const { return 1; }
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#else
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inline int_t getSamples(void) const
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{
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glBindRenderbuffer(GL_RENDERBUFFER, mObjectName);
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GLint samples;
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glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
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return (int_t)samples;
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}
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#endif
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// ===================================================================================================== \/
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// ============================================================================================ WRAPPERS \/
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// ===================================================================================================== \/
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public:
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//! Bind the renderbuffer
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inline void bind(void) const
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{
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glBindRenderbuffer(GL_RENDERBUFFER, mObjectName);
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}
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//! Set texture size and NULL data
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inline void setSize(
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GLsizei _width,
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GLsizei _height,
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GLsizei _samples = 0)
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{
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mWidth = _width;
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mHeight = _height;
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// the sample count will not get saved as the real samples returned by GL might differ this number anyway!
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glBindRenderbuffer(GL_RENDERBUFFER, mObjectName);
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#if (ACGL_OPENGL_VERSION >= 30)
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glRenderbufferStorageMultisample(GL_RENDERBUFFER, _samples, mInternalFormat, mWidth, mHeight);
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#else // OpenGL ES, as Desktop GL didn't have renderbuffers pre 3.0 anyway
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glRenderbufferStorage(GL_RENDERBUFFER, mInternalFormat, mWidth, mHeight);
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#endif // OpenGL >= 3.0
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}
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// =================================================================================================== \/
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// ============================================================================================ FIELDS \/
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// =================================================================================================== \/
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protected:
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GLuint mObjectName;
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GLenum mInternalFormat;
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GLsizei mWidth;
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GLsizei mHeight;
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};
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ACGL_SMARTPOINTER_TYPEDEFS(RenderBuffer)
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} // OpenGL
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} // ACGL
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#endif // ACGL_OPENGL_OBJECTS_RENDERBUFFER_HH
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