PhongShader.h

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// The MIT License (MIT)
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// Copyright (c) 2018 www.open3d.org
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#pragma once

#include <vector>
#include <Eigen/Core>
#include <Open3D/Visualization/Shader/ShaderWrapper.h>

namespace open3d {
namespace visualization {

namespace glsl {

class PhongShader : public ShaderWrapper {
public:
    ~PhongShader() override { Release(); }

protected:
    PhongShader(const std::string &name) : ShaderWrapper(name) { Compile(); }

protected:
    bool Compile() final;
    void Release() final;
    bool BindGeometry(const geometry::Geometry &geometry,
                      const RenderOption &option,
                      const ViewControl &view) final;
    bool RenderGeometry(const geometry::Geometry &geometry,
                        const RenderOption &option,
                        const ViewControl &view) final;
    void UnbindGeometry() final;

protected:
    virtual bool PrepareRendering(const geometry::Geometry &geometry,
                                  const RenderOption &option,
                                  const ViewControl &view) = 0;
    virtual bool PrepareBinding(const geometry::Geometry &geometry,
                                const RenderOption &option,
                                const ViewControl &view,
                                std::vector<Eigen::Vector3f> &points,
                                std::vector<Eigen::Vector3f> &normals,
                                std::vector<Eigen::Vector3f> &colors) = 0;

protected:
    void SetLighting(const ViewControl &view, const RenderOption &option);

protected:
    GLuint vertex_position_;
    GLuint vertex_position_buffer_;
    GLuint vertex_color_;
    GLuint vertex_color_buffer_;
    GLuint vertex_normal_;
    GLuint vertex_normal_buffer_;
    GLuint MVP_;
    GLuint V_;
    GLuint M_;
    GLuint light_position_world_;
    GLuint light_color_;
    GLuint light_diffuse_power_;
    GLuint light_specular_power_;
    GLuint light_specular_shininess_;
    GLuint light_ambient_;

    // At most support 4 lights
    GLHelper::GLMatrix4f light_position_world_data_;
    GLHelper::GLMatrix4f light_color_data_;
    GLHelper::GLVector4f light_diffuse_power_data_;
    GLHelper::GLVector4f light_specular_power_data_;
    GLHelper::GLVector4f light_specular_shininess_data_;
    GLHelper::GLVector4f light_ambient_data_;
};

class PhongShaderForPointCloud : public PhongShader {
public:
    PhongShaderForPointCloud() : PhongShader("PhongShaderForPointCloud") {}

protected:
    bool PrepareRendering(const geometry::Geometry &geometry,
                          const RenderOption &option,
                          const ViewControl &view) final;
    bool PrepareBinding(const geometry::Geometry &geometry,
                        const RenderOption &option,
                        const ViewControl &view,
                        std::vector<Eigen::Vector3f> &points,
                        std::vector<Eigen::Vector3f> &normals,
                        std::vector<Eigen::Vector3f> &colors) final;
};

class PhongShaderForTriangleMesh : public PhongShader {
public:
    PhongShaderForTriangleMesh() : PhongShader("PhongShaderForTriangleMesh") {}

protected:
    bool PrepareRendering(const geometry::Geometry &geometry,
                          const RenderOption &option,
                          const ViewControl &view) final;
    bool PrepareBinding(const geometry::Geometry &geometry,
                        const RenderOption &option,
                        const ViewControl &view,
                        std::vector<Eigen::Vector3f> &points,
                        std::vector<Eigen::Vector3f> &normals,
                        std::vector<Eigen::Vector3f> &colors) final;
};

}  // namespace glsl

}  // namespace visualization
}  // namespace open3d