From 43394c8a8908442982e3a7e25975c31b3c952923 Mon Sep 17 00:00:00 2001
From: Nikolas <nikolas@boutalas.com>
Date: Sun, 27 Oct 2024 12:52:55 +0200
Subject: root

---
 graphics/GLbackend.h | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 graphics/GLbackend.h

(limited to 'graphics/GLbackend.h')

diff --git a/graphics/GLbackend.h b/graphics/GLbackend.h
new file mode 100644
index 0000000..7b00b90
--- /dev/null
+++ b/graphics/GLbackend.h
@@ -0,0 +1,140 @@
+#pragma once
+#define GL3_PROTOTYPES 1
+#include <GL/glew.h>
+#include <SDL2/SDL.h>
+#include <string>
+#include <thread>
+#include "shader.h"
+#include "fonts.h"
+#include <functional>
+#include <glm/vec3.hpp>
+#include "scancodes.h"
+#include "texture.h"
+#include "AudioManager.h"
+
+#define SGG_CHECK_GL() do {GLenum err;while((err = glGetError()) != GL_NO_ERROR){ printf("Error %s %d\n", (const char*)glewGetErrorString(err), err);exit(0);}printf("Pass\n");} while(0);
+
+constexpr auto CURVE_SUBDIVS = 64;
+
+//#undef main
+namespace graphics
+{
+	void PrintSDL_GL_Attributes();
+	void CheckSDLError(int line);
+
+	class GLBackend
+	{
+	protected:
+		int			  m_width,
+					  m_height;
+		std::string   m_title;
+		SDL_Window *  m_window;
+		uint32_t      m_windowID;
+		SDL_GLContext m_context;
+		bool		  m_initialized = false;
+		FontLib		  m_fontlib;
+		SDL_TimerID   m_idle_timer;
+		glm::vec3	  m_back_color = { 0.0f, 0.0f, 0.0f };
+
+		glm::ivec2	  m_mouse_pos = glm::ivec2();
+		glm::ivec2	  m_prev_mouse_pos = glm::ivec2();
+		bool		  m_button_state[3] = { 0, 0, 0 };
+		bool		  m_button_pressed[3] = { 0, 0, 0 };
+		bool		  m_button_released[3] = { 0, 0, 0 };
+		bool		  m_mouse_dragging = false;
+
+		glm::vec4	  m_requested_canvas = glm::vec4(0.0f);
+		glm::vec4	  m_canvas;
+		int			  m_canvas_mode = 0;
+
+		glm::mat4	  m_projection;
+		glm::mat4	  m_transformation = glm::mat4(1.0f);
+		float		  m_orientation = 0.0f;
+		glm::vec3	  m_scale = glm::vec3(1.0f);
+		Shader		  m_flat_shader;
+		
+		GLuint		m_rect_vbo;
+		GLuint		m_rect_vao;
+		GLuint		m_rect_outline_vbo;
+		GLuint		m_rect_outline_vao;
+		GLuint		m_line_vbo;
+		GLuint		m_line_vao;
+		GLuint		m_sector_vbo;
+		GLuint		m_sector_vao;
+		GLuint		m_sector_outline_vbo;
+		GLuint		m_sector_outline_vao;
+
+		glm::vec4	m_window_to_canvas_factors;
+
+		AudioManager * m_audio = nullptr;
+
+		TextureManager textures;
+
+		std::chrono::time_point<std::chrono::steady_clock> m_prev_time_tick;
+		float m_global_time = 0.0f;
+		float m_delta_time = 0.0f;
+
+		const void* m_user_data = nullptr;
+
+		bool processEvent(SDL_Event event);
+
+		void advanceTime();
+
+		void computeProjection();
+		void initPrimitives();
+		void computeTransformation();
+
+		std::function<void()> m_draw_callback = nullptr;
+		std::function<void(float ms)> m_idle_callback = nullptr;
+		std::function<void(int w, int h)> m_resize_callback = nullptr;
+
+	public:
+		void drawRect(float cx, float cy, float w, float h, const struct Brush & brush);
+		void drawLine(float x_1, float y_1, float x_2, float y_2, const struct Brush & brush);
+		void drawSector(float cx, float cy, float start_angle, float end_angle, float radius1, float radius2, const struct Brush & brush);
+		void drawText(float pos_x, float pos_y, float size, const std::string & text, const Brush & brush);
+		
+		void setUserData(const void* user_data);
+		void* getUserData();
+
+		void setScale(float sx, float sy, float sz);
+		void setOrientation(float degrees);
+		void resetPose();
+		bool setFont(std::string fontname);
+
+		bool getKeyState(scancode_t key);
+		void setDrawCallback(std::function<void()> drf);
+		void setIdleCallback(std::function<void(float ms)> idf);
+		void setResizeCallback(std::function<void(int w, int h)> rsf);
+		virtual bool init();
+		GLBackend(int w = 800, int h = 600, std::string title = "");
+		virtual void cleanup();
+		void swap();
+		bool processMessages();
+		virtual void update(float delta_time = 0.0f);
+		virtual void resize(int w, int h);
+		float WindowToCanvasX(float x, bool clamped = true);
+		float WindowToCanvasY(float y, bool clamped = true);
+		virtual void draw();
+		virtual ~GLBackend();
+		void makeCurrent();
+		void show(bool s);
+		void setBackgroundColor(float r, float g, float b);
+		float getDeltaTime();
+		float getGlobalTime();
+		void getMouseButtonPressed(bool * button_array);
+		void getMouseButtonReleased(bool * button_array);
+		void getMouseButtonState(bool * button_array);
+		void getMousePosition(int * x, int * y);
+		void getPrevMousePosition(int * x, int * y);
+		bool isMouseDragging();
+		void setCanvasMode(int m);
+		void setCanvasSize(float w, float h);
+		void setFullscreen(bool fs);
+
+		void playSound(std::string soundfile, float volume, bool looping = false);
+		void playMusic(std::string soundfile, float volume, bool looping = true, int fade_time = 0);
+		void stopMusic(int fade_time = 0);
+	};
+
+}
\ No newline at end of file
-- 
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