opengl_utils.hpp

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 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
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#ifndef OPENGL_UTILS_HPP
#define OPENGL_UTILS_HPP
 
#ifdef HAVE_CONFIG_H
#       include "config.h"
#endif //HAVE_CONFIG_H
 
#ifdef __APPLE__
#       include <OpenGL/OpenGL.h> // CGL
#       include <OpenGL/gl3.h>
#       include <OpenGL/glext.h>
#elif defined __linux__
#       include <X11/Xlib.h>
#       include <GL/glew.h>
#       include <GL/glx.h>
#else // _WIN32
#       include <GL/glew.h>
#endif //__APPLE__
 
#include <SDL2/SDL.h>
//#include <SDL2/SDL_opengl.h>
#include <mutex>
#include <memory>
#include <vector>
#include <cassert>
 
#include "types.h"
 
bool check_gl_extension_present(const char *ext);
 
class GlProgram{
public:
        GlProgram() = default;
        GlProgram(const char *vert_src, const char *frag_src);
        ~GlProgram();
 
        GLuint get() { return program; }
 
        GlProgram(const GlProgram&) = delete;
        GlProgram(GlProgram&& o) { swap(o); }
        GlProgram& operator=(const GlProgram&) = delete;
        GlProgram& operator=(GlProgram&& o) { swap(o); return *this; }
 
private:
        void swap(GlProgram& o){
                std::swap(program, o.program);
        }
        GLuint program = 0;
};
 
class Model{
public:
        Model() = default;
        Model(const Model&) = delete;
        Model(Model&& o) { swap(o); }
        Model& operator=(const Model&) = delete;
        Model& operator=(Model&& o) { swap(o); return *this; }
        ~Model();
 
        GLuint get_vao() const { return vao; }
 
        void render();
 
        static Model get_sphere();
 
        static Model get_quad();
 
private:
        void swap(Model& o){
                std::swap(vao, o.vao);
                std::swap(vbo, o.vbo);
                std::swap(elem_buf, o.elem_buf);
                std::swap(indices_num, o.indices_num);
        }
        GLuint vao = 0;
        GLuint vbo = 0;
        GLuint elem_buf = 0;
        GLsizei indices_num = 0;
};
 
class Texture{
public:
        Texture() = default;
        ~Texture();
 
        GLuint get() const { assert(tex_id); return tex_id; }
 
        void allocate(int w, int h, GLint internal_fmt);
 
        void allocate();
 
        void load_frame(int w, int h,
                        GLint internal_format,
                        GLenum src_format,
                        GLenum type,
                        video_frame *f,
                        bool pbo_frame);
 
        Texture(const Texture&) = delete;
        Texture(Texture&& o) { swap(o); }
        Texture& operator=(const Texture&) = delete;
        Texture& operator=(Texture&& o) { swap(o); return *this; }
 
 
        void swap(Texture& o){
                std::swap(tex_id, o.tex_id);
                std::swap(width, o.width);
                std::swap(height, o.height);
                std::swap(internal_format, o.internal_format);
                std::swap(pbo, o.pbo);
        }
private:
        GLuint tex_id = 0;
        int width = 0;
        int height = 0;
        GLint internal_format = 0;
 
        GLuint pbo = 0;
};
 
class Framebuffer{
public:
        Framebuffer(){
                glGenFramebuffers(1, &fbo);
        }
 
        ~Framebuffer(){
                glDeleteFramebuffers(1, &fbo);
        }
 
        Framebuffer(const Framebuffer&) = delete;
        Framebuffer(Framebuffer&& o) { swap(o); }
        Framebuffer& operator=(const Framebuffer&) = delete;
        Framebuffer& operator=(Framebuffer&& o) { swap(o); return *this; }
 
        GLuint get() { return fbo; }
 
        void attach_texture(GLuint tex);
 
        void attach_texture(const Texture& tex){
                attach_texture(tex.get());
        }
 
private:
        void swap(Framebuffer& o){
                std::swap(fbo, o.fbo);
        }
 
        GLuint fbo = 0;
};
 
class GlBuffer{
public:
        GlBuffer(){
                glGenBuffers(1, &buf_id);
        }
 
        ~GlBuffer(){
                glDeleteBuffers(1, &buf_id);
        }
 
        GLuint get() {
                return buf_id;
        }
 
        GlBuffer(const GlBuffer&) = delete;
        GlBuffer(GlBuffer&& o) { swap(o); }
        GlBuffer& operator=(const GlBuffer&) = delete;
        GlBuffer& operator=(GlBuffer&& o) { swap(o); return *this; }
 
private:
        void swap(GlBuffer& o){
                std::swap(buf_id, o.buf_id);
        }
 
        GLuint buf_id = 0;
};
 
class Frame_convertor{
public:
        virtual ~Frame_convertor() {};
 
        template<class Derived>
        static std::unique_ptr<Frame_convertor> construct_unique() {
                return std::make_unique<Derived>();
        }
 
        virtual void put_frame(video_frame *f, bool pbo_frame = false) = 0;
 
        virtual void attach_texture(Texture& tex) = 0;
 
        void set_pbo(GlBuffer *pbo) { internal_pbo = pbo; }
protected:
        GlBuffer *internal_pbo = nullptr;
};
 
class FrameUploader{
public:
        void put_frame(video_frame *f, bool pbo_frame = false);
        void attach_dst_texture(Texture *tex){ this->tex = tex; }
 
        void enable_pbo(bool enable) {
                if(enable)
                        upload_pbo = std::make_unique<GlBuffer>();
                else
                        upload_pbo.reset();
        }
 
        std::vector<codec_t> get_supported_codecs();
 
private:
        std::unique_ptr<Frame_convertor> conv;
        codec_t configured_codec = VIDEO_CODEC_NONE;
        Texture *tex = nullptr;
        std::unique_ptr<GlBuffer> upload_pbo;
};
 
class TripleBufferTexture{
public:
        void allocateTextures() {
                back.allocate();
                mid.allocate();
                front.allocate();
        }
 
        Texture& get_back(){ return back; }
 
        Texture& get_front(){ return front; }
 
        void swap_back(){
                back.swap(mid);
                new_front_available = true;
        }
 
        void swap_front(){
                front.swap(mid);
                new_front_available = false;
        }
 
        bool is_new_front_available() const { return new_front_available; }
 
private:
        Texture back;
        Texture front;
        Texture mid;
 
        bool new_front_available = false;
};
 
 
class FlatVideoScene{
public:
        FlatVideoScene() = default;
 
        void init();
        void put_frame(video_frame *f);
        void render();
        void resize(int width, int height);
 
        void enableDeinterlacing(bool enable);
 
        GLuint get_texture() { return texture.get(); }
private:
        GlProgram program;
        Model quad;
        Texture texture;
        FrameUploader uploader;
 
        video_desc current_desc;
        int screen_width;
        int screen_height;
};
 
#endif