gSkybox.h

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/*
 * Copyright (C) 2016 Nitra Games Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef GRAPHICS_GSKYBOX_H_
#define GRAPHICS_GSKYBOX_H_
 
#include <array>
#include <string>
#include "gNode.h"
#include "gVbo.h"
#include "gImage.h"
 
class gSkybox : public gNode {
public:
    gSkybox();
    virtual ~gSkybox();
 
    unsigned int loadTextures(const std::vector<std::string>& texturePaths);
 
    unsigned int load(const std::vector<std::string>& fullPaths);
 
    unsigned int loadEquirectangular(const std::string& fullPath);
    unsigned int loadTextureEquirectangular(const std::string& texturePath);
 
    void loadFromData(std::array<int, 6> widths, std::array<int, 6> heights, std::array<void*, 6> rawdata, std::array<bool, 6> ishdr);
 
    void draw();
 
    void generatePbrMaps();
    void bindPbrMaps();
 
    void loadSkybox(gImage* images);
    void loadDataSkybox(std::string* data, int width, int height);
private:
    unsigned int id;
    int width, height, nrChannels;
    void setupRenderData();
 
    unsigned int cubeVAO, cubeVBO;
    unsigned int skyboxVAO, skyboxVBO;
 
    gShader* skyboxshader;
 
    gVbo vbo;
    int skymapint, skymapslot;
 
    //Equirectangular variables and objects
    gShader* pbrShader;
    gShader* equirectangularToCubemapShader;
    gShader* irradianceShader;
    gShader* prefilterShader;
    gShader* brdfShader;
 
    unsigned int captureFBO;
    unsigned int captureRBO;
    unsigned int irradianceMap;
    unsigned int prefilterMap;
    unsigned int brdfLUTTexture;
    unsigned int quadVAO;
    unsigned int quadVBO;
 
    void renderCube();
    void renderQuad();
 
    bool ishdr, ispbr;
};
 
#endif /* GRAPHICS_GSKYBOX_H_ */