90 lines
3.9 KiB
C++
90 lines
3.9 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_PROGRAMPIPELINE_HH
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#define ACGL_OPENGL_OBJECTS_PROGRAMPIPELINE_HH
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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/OpenGL/Objects/ShaderProgram.hh>
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#if (ACGL_OPENGL_VERSION >= 41)
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namespace ACGL{
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namespace OpenGL{
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/**
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* OpenGL ProgramPipeline Objects (needs OpenGL 4.1)
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*
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* Multiple ShaderPrograms that are set to be separable can be attached to one ProgramPipeline.
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* Uniforms are still a ShaderProgram (not ProgramPipeline) state, so to update them you either have to
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* select the correct ShaderProgram first (glActiveShaderProgram) or use the setProgramUniform variants.
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*
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* When using multiple ShaderPrograms in one ProgramPipeline the varyings don't just match based on
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* the names any more, look up "Shader Interface Matching", cry, and rethink whether you still want to
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* play around with ProgramPipeline Objects.
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*/
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class ProgramPipeline {
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ACGL_NOT_COPYABLE(ProgramPipeline)
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public:
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ProgramPipeline();
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~ProgramPipeline(void);
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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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// ===================================================================================================== \/
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// ============================================================================================ WRAPPERS \/
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// ===================================================================================================== \/
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//! Set this ProgramPipeline active, will override active ShaderPrograms!
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inline void bind() const
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{
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glBindProgramPipeline( mObjectName );
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}
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//! unbinds the ProgramPipeline (if there is one bound), after that, ShaderPrograms can be used again directly
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inline static void unBind() { glBindProgramPipeline( 0 ); }
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//! Sets the given ShaderProgram (that should be part of the ProgramPipeline, which should be active) as target
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//! for setUniform() calls. Alternatively use the setProgramUniform calls!
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inline void setActiveShaderProgram( GLuint _shaderProgram ) { glActiveShaderProgram( mObjectName, _shaderProgram ); }
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//! Sets the given ShaderProgram (that should be part of the ProgramPipeline, which should be active) as target
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//! for setUniform() calls. Alternatively use the setProgramUniform calls!
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inline void setActiveShaderProgram( const SharedShaderProgram &_shaderProgram ) { glActiveShaderProgram( mObjectName, _shaderProgram->getObjectName() ); }
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//! _stages is a bitwise OR of GL_TESS_CONTROL_SHADER_BIT, GL_TESS_EVALUATION_SHADER_BIT, GL_VERTEX_SHADER_BIT, GL_GEOMETRY_SHADER_BIT,
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//! and/or GL_FRAGMENT_SHADER_BIT _or_ GL_ALL_SHADER_BITS
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void useProgramStages( GLbitfield _stages, SharedShaderProgram _shaderProgram ) {
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if (_shaderProgram) {
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glUseProgramStages( mObjectName, _stages, _shaderProgram->getObjectName() );
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} else {
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glUseProgramStages( mObjectName, _stages, 0 ); // deactivates that part of the pipeline (defined by _stages)
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}
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}
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private:
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// TODO: save 5 SharedPointer to the 5 ShaderPrograms for the individual stages
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GLuint mObjectName;
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};
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ACGL_SMARTPOINTER_TYPEDEFS(ProgramPipeline)
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} // OpenGL
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} // ACGL
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#endif // OpenGL >= 4.1
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#endif // ACGL_OPENGL_OBJECTS_PROGRAMPIPELINE_HH
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