ShaderWrapper.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include <GL/glew.h>
 
#include "open3d/geometry/Geometry.h"
#include "open3d/visualization/visualizer/RenderOption.h"
#include "open3d/visualization/visualizer/ViewControl.h"
 
namespace open3d {
namespace visualization {
 
namespace glsl {
 
class ShaderWrapper {
public:
    virtual ~ShaderWrapper() {}
    ShaderWrapper(const ShaderWrapper &) = delete;
    ShaderWrapper &operator=(const ShaderWrapper &) = delete;
 
protected:
    ShaderWrapper(const std::string &name) : shader_name_(name) {}
 
public:
    bool Render(const geometry::Geometry &geometry,
                const RenderOption &option,
                const ViewControl &view);
 
    void InvalidateGeometry();
 
    const std::string &GetShaderName() const { return shader_name_; }
 
    void PrintShaderWarning(const std::string &message) const;
 
protected:
    virtual bool Compile() = 0;
 
    virtual void Release() = 0;
 
    virtual bool BindGeometry(const geometry::Geometry &geometry,
                              const RenderOption &option,
                              const ViewControl &view) = 0;
    virtual bool RenderGeometry(const geometry::Geometry &geometry,
                                const RenderOption &option,
                                const ViewControl &view) = 0;
    virtual void UnbindGeometry() = 0;
 
protected:
    bool ValidateShader(GLuint shader_index);
    bool ValidateProgram(GLuint program_index);
    bool CompileShaders(const char *const vertex_shader_code,
                        const char *const geometry_shader_code,
                        const char *const fragment_shader_code);
    void ReleaseProgram();
 
protected:
    GLuint vertex_shader_ = 0;
    GLuint geometry_shader_ = 0;
    GLuint fragment_shader_ = 0;
    GLuint program_ = 0;
    GLenum draw_arrays_mode_ = GL_POINTS;
    GLsizei draw_arrays_size_ = 0;
    bool compiled_ = false;
    bool bound_ = false;
 
    void SetShaderName(const std::string &shader_name) {
        shader_name_ = shader_name;
    }
 
private:
    std::string shader_name_ = "ShaderWrapper";
};
 
}  // namespace glsl
 
}  // namespace visualization
}  // namespace open3d