blurshader.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
#pragma once
 
// External Includes
#include <shader.h>
#include <renderservice.h>
#include <nap/core.h>
 
namespace nap
{
    enum class EBlurSamples : uint
    {
        X5  = 0,    
        X9  = 1,    
        X13 = 2     
    };
 
    namespace uniform
    {
        namespace blur
        {
            namespace sampler
            {
                inline constexpr const char* colorTexture   = "colorTexture";       
            }
 
            inline constexpr const char* uboStruct = "UBO";                         
            inline constexpr const char* textureSize = "textureSize";               
            inline constexpr const char* direction = "direction";                   
        }
    }
 
    template <EBlurSamples KERNEL>
    class BlurShader : public Shader
    {
        RTTI_ENABLE(Shader)
    public:
        // Constructor
        BlurShader(Core& core) : Shader(core), mRenderService(core.getService<RenderService>()) { }
 
        virtual bool init(utility::ErrorState& errorState) override;
 
    private:
        RenderService* mRenderService = nullptr;
    };
 
    // Blur Shader Definitions
    using Blur5x5Shader = BlurShader<EBlurSamples::X5>;
    using Blur9x9Shader = BlurShader<EBlurSamples::X9>;
    using Blur13x13Shader = BlurShader<EBlurSamples::X13>;
 
 
    // Template Definitions
 
    template <EBlurSamples KERNEL>
    bool nap::BlurShader<KERNEL>::init(utility::ErrorState& errorState)
    {
        if (!Shader::init(errorState))
            return false;
 
        std::string shader_name;
        switch (KERNEL)
        {
        case nap::EBlurSamples::X5:
            shader_name = "gaussianblur5";
            break;
        case nap::EBlurSamples::X9:
            shader_name = "gaussianblur9";
            break;
        case nap::EBlurSamples::X13:
            shader_name = "gaussianblur13";
            break;
        default:
            errorState.fail("Unknown blur sample type.");
            return false;
        }
        return loadDefault(shader_name, errorState);
    }
}