BlurPass.h

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#pragma once
 
#include "Graphics/Vulkan/PostProcess/PostProcessPass.h"
 
#define BLUR_MAX_SAMPLES 127
 
struct BlurUniforms
{
    int32_t mHorizontal = 0;
    int32_t mNumSamples = 4;
    float mBlurSize = 4.0f;
    float mSigmaRatio = 0.2f;
 
    int32_t mBoxBlur = 0;
    int32_t mInputWidth = 1;
    int32_t mInputHeight = 1;
    int32_t mPad0 = 1337;
 
    glm::vec4 mGaussianWeights[BLUR_MAX_SAMPLES] = { };
};
 
class BlurPass : public PostProcessPass
{
public:
 
    virtual void Create() override;
    virtual void Destroy() override;
 
    virtual void Render(Image* input, Image* output) override;
 
    virtual void GatherProperties(std::vector<Property>& props) override;
 
protected:
 
    Image* mXBlurImage = nullptr;
    BlurUniforms mUniforms = {};
 
    // Extra render targets used when blurring at half or quarter resolution.
    Image* mXBlurLowResImage = nullptr;
    Image* mYBlurLowResImage = nullptr;
    int32_t mDownsampleFactor = 1;
    bool mEnableDownsample = false;
};