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83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
//
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// GlowEffect.h
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// interface
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//
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// Created by Andrzej Kapolka on 8/7/13.
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// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
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//
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#ifndef __interface__GlowEffect__
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#define __interface__GlowEffect__
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#include <QObject>
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#include <QStack>
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class QOpenGLFramebufferObject;
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class ProgramObject;
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/// A generic full screen glow effect.
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class GlowEffect : public QObject {
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Q_OBJECT
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public:
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GlowEffect();
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~GlowEffect();
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/// Returns a pointer to the framebuffer object that the glow effect is *not* using for persistent state
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/// (either the secondary or the tertiary).
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QOpenGLFramebufferObject* getFreeFramebufferObject() const;
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void init();
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/// Prepares the glow effect for rendering the current frame. To be called before rendering the scene.
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void prepare();
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/// Starts using the glow effect.
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/// \param intensity the desired glow intensity, from zero to one
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void begin(float intensity = 1.0f);
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/// Stops using the glow effect.
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void end();
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/// Renders the glow effect. To be called after rendering the scene.
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/// \param toTexture whether to render to a texture, rather than to the frame buffer
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/// \return the framebuffer object to which we rendered, or NULL if to the frame buffer
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QOpenGLFramebufferObject* render(bool toTexture = false);
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public slots:
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void cycleRenderMode();
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private:
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enum RenderMode { ADD_MODE, BLUR_ADD_MODE, BLUR_PERSIST_ADD_MODE, DIFFUSE_ADD_MODE, RENDER_MODE_COUNT };
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bool _initialized;
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RenderMode _renderMode;
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ProgramObject* _addProgram;
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ProgramObject* _horizontalBlurProgram;
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ProgramObject* _verticalBlurAddProgram;
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ProgramObject* _verticalBlurProgram;
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ProgramObject* _addSeparateProgram;
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ProgramObject* _diffuseProgram;
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int _diffusionScaleLocation;
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bool _isEmpty; ///< set when nothing in the scene is currently glowing
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bool _isOddFrame; ///< controls the alternation between texture targets in diffuse add mode
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bool _isFirstFrame; ///< for persistent modes, notes whether this is the first frame rendered
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float _intensity;
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QStack<float> _intensityStack;
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};
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/// RAII-style glow handler. Applies glow when in scope.
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class Glower {
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public:
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Glower(float amount = 1.0f);
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~Glower();
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};
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#endif /* defined(__interface__GlowEffect__) */
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