window.cpp

/*
Copyright (c) RELEX Oy

All rights reserved.

Source made public only to facilitate research and bug reproduction in WASM, Esmcripten, C# Runtimes such as Blazor, Angular and WebGL.
*/

#include "window.h"
#include <stdlib.h>
#include "callbacks.h"


Window::Window(int window_width, int window_height) {
	if (!glfwInit())
		exit(-1);

	glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
	glfwWindowHint(GLFW_SRGB_CAPABLE, GL_TRUE);
	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);

	m_window = glfwCreateWindow(window_width, window_height, "Fullscreen Triangle /w frag shader", NULL, NULL);
	if (!m_window)
	{
		glfwTerminate();
		exit(-1);
	}

	glfwMakeContextCurrent(m_window);
	
	m_mouse_down = false;
	glfwSetInputMode(m_window, GLFW_STICKY_MOUSE_BUTTONS, GLFW_TRUE); // set mouse button clicks to be 'sticky' - make sure the release callback is always invoked
	glfwSetMouseButtonCallback(m_window, mouse_button_callback); // called only on button down and button up
	glfwSetKeyCallback(m_window, key_callback);
	glfwSwapInterval(1);

	GLenum err = glewInit();
	if (err != GLEW_OK)
	{
		glfwTerminate();
		exit(-1);
	}

	//create renderer object to handle GL calls
	m_renderer = new Renderer(window_width, window_height);
	glfwSetWindowUserPointer(m_window, this);
}


bool Window::keepAlive() {
	return !glfwWindowShouldClose(m_window); // returns false after pressing escape
}


void Window::update() {
	//handle input
	glfwPollEvents();
	if (m_mouse_down) 
		onMouseDrag();

	m_renderer->Set_iTime(glfwGetTime());

	// main loop, render, blit to back buffer and swap front&back buffers
	m_renderer->render();
	glfwSwapBuffers(m_window);
}


Window::~Window() {
	delete m_renderer;
	glfwDestroyWindow(m_window);
	glfwTerminate();
}


Renderer* Window::getRenderer() {
	return m_renderer;
}


void Window::onMouseDrag() {
	double xpos, ypos;
	glfwGetCursorPos(m_window, &xpos, &ypos); // get cursor position on screen
	m_renderer->Set_iMouse(xpos, ypos);

}