Method preProcess

src/renderManager.cpp:51–107

}

bool RenderManager::preProcess(){
    //Initializing the surface that we use to draw screen-space effects
    canvas.setup();

    //Building the grid of AABB enclosing the view frustum clusters
    buildAABBGridCompShader.use();
    buildAABBGridCompShader.setFloat("zNear", sceneCamera->cameraFrustum.nearPlane);
    buildAABBGridCompShader.setFloat("zFar", sceneCamera->cameraFrustum.farPlane);
    buildAABBGridCompShader.dispatch(gridSizeX, gridSizeY, gridSizeZ);

    //Environment Mapping
    //Passing equirectangular map to cubemap
    captureFBO.bind();
    currentScene->mainSkyBox.fillCubeMapWithTexture(fillCubeMapShader);

    //Cubemap convolution TODO:: This could probably be moved to a function of the scene or environment maps
    //themselves as a class / static function
    int res = currentScene->irradianceMap.width;
    captureFBO.resizeFrameBuffer(res);
    unsigned int environmentID = currentScene->mainSkyBox.skyBoxCubeMap.textureID;
    currentScene->irradianceMap.convolveCubeMap(environmentID, convolveCubeMap);

    //Cubemap prefiltering TODO:: Same as above
    unsigned int captureRBO = captureFBO.depthBuffer;
    currentScene->specFilteredMap.preFilterCubeMap(environmentID, captureRBO, preFilterSpecShader);

    //BRDF lookup texture
    integrateBRDFShader.use();
    res = currentScene->brdfLUTTexture.height;
    captureFBO.resizeFrameBuffer(res);
    unsigned int id = currentScene->brdfLUTTexture.textureID;
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, id, 0);
    glViewport(0, 0, res, res);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    canvas.draw();

    //Making sure that the viewport is the correct size after rendering
    glViewport(0, 0, DisplayManager::SCREEN_WIDTH, DisplayManager::SCREEN_HEIGHT);

    glEnable(GL_DEPTH_TEST);
    glDepthMask(true);

    //Populating depth cube maps for the point light shadows
    for (unsigned int i = 0; i < currentScene->pointLightCount; ++i){
        pointLightShadowFBOs[i].bind();
        pointLightShadowFBOs[i].clear(GL_DEPTH_BUFFER_BIT, glm::vec3(1.0f));
        currentScene->drawPointLightShadow(pointShadowShader, i, pointLightShadowFBOs[i].depthBuffer);
    }

    // Directional shadows
    dirShadowFBO.bind();
    dirShadowFBO.clear(GL_DEPTH_BUFFER_BIT, glm::vec3(1.0f));
    currentScene->drawDirLightShadows(dirShadowShader, dirShadowFBO.depthBuffer);
    
    //As we add more error checking this will change from a dummy variable to an actual thing
    return true;
}