FXAA.cpp

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#include "FXAA.h"
#include <glad/glad.h>
#include "Utility.h"
 
#include "screen.vert.h"
#include "fxaa.frag.h"
 
namespace dyno
{
    FXAA::FXAA()
        : RelativeContrastThreshold(1.f / 8.f)
        , HardContrastThreshold(1.f / 16.f)
        , SubpixelBlendLimit(3.f / 4.f)
        , SubpixelContrastThreshold(1.f / 4.f)
        , EndpointSearchIterations(12)
        , UseHighQualityEndpoints(true)
    {
        mScreenQuad = Mesh::ScreenQuad();
        mShaderProgram = Program::createProgramSPIRV(
            SCREEN_VERT, sizeof(SCREEN_VERT),
            FXAA_FRAG, sizeof(FXAA_FRAG));
    }
 
    FXAA::~FXAA()
    {
        if (mScreenQuad) {
            mScreenQuad->release();
            delete mScreenQuad;
        }
        if (mShaderProgram) {
            mShaderProgram->release();
            delete mShaderProgram;
        }
    }
 
    void FXAA::apply(int width, int height)
    {
        mShaderProgram->use();
 
        mShaderProgram->setInt("Input", 1); // GL_TEXTURE1
        mShaderProgram->setVec2("InvTexSize", { 1.f / width, 1.f / height });
 
        mShaderProgram->setInt("EndpointSearchIterations", EndpointSearchIterations);
        mShaderProgram->setFloat("RelativeContrastThreshold", RelativeContrastThreshold);
        mShaderProgram->setFloat("HardContrastThreshold", HardContrastThreshold);
        mShaderProgram->setFloat("SubpixelBlendLimit", SubpixelBlendLimit);
        mShaderProgram->setFloat("SubpixelContrastThreshold", SubpixelContrastThreshold);
        
        mScreenQuad->draw();
    }
}