Simple2DShader.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include <Eigen/Core>
#include <vector>
 
#include "open3d/visualization/shader/ShaderWrapper.h"
 
namespace open3d {
namespace visualization {
 
namespace glsl {
 
class Simple2DShader : public ShaderWrapper {
public:
    ~Simple2DShader() override { Release(); }
 
protected:
    Simple2DShader(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> &colors) = 0;
 
protected:
    GLuint vertex_position_;
    GLuint vertex_position_buffer_;
    GLuint vertex_color_;
    GLuint vertex_color_buffer_;
};
 
class Simple2DShaderForSelectionPolygon : public Simple2DShader {
public:
    Simple2DShaderForSelectionPolygon()
        : Simple2DShader("Simple2DShaderForSelectionPolygon") {}
 
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> &colors) final;
};
 
}  // namespace glsl
 
}  // namespace visualization
}  // namespace open3d