main.cpp

#include <thread>

#include "game.h"

GLFWwindow* initializeWindow(int width, int height, const char* name);
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow* window);
void mouse_callback(GLFWwindow* window, double xposIn, double yposIn);
void mouse_button_callback(GLFWwindow* window, int button, int action,
	int mods);
void framedelay();

float lastFrame = 0.0f;
float framerate = 60.0f;

int main()
{
	GLFWwindow* window = initializeWindow(SCR_WIDTH, SCR_HEIGHT, "Chess");

	stbi_set_flip_vertically_on_load(true);

	Game game = Game();

	while (!glfwWindowShouldClose(window))
	{
		processInput(window);

		game.update();

		glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT);

		framedelay();

		game.draw();

		glfwSwapBuffers(window);
		glfwPollEvents();
	}

	glfwTerminate();
	return 0;
}

GLFWwindow* initializeWindow(int width, int height, const char* name)
{
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
	// glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

	GLFWwindow* window = glfwCreateWindow(width, height, name, NULL, NULL);

	if (window == NULL)
	{
		std::cout << "Failed to create GLFW window" << std::endl;
		glfwTerminate();
		exit(1);
	}

	glfwMakeContextCurrent(window);
	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
	glfwSetCursorPosCallback(window, mouse_callback);
	glfwSetMouseButtonCallback(window, mouse_button_callback);

	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
	{
		std::cout << "Failed to initialize GLAD" << std::endl;
		exit(1);
	}

	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	// glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO);
	// glfwSetInputMode(window, GLFW_STICKY_MOUSE_BUTTONS, GLFW_TRUE);

	return window;
}

void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
	glViewport(0, 0, width, height);
}

void processInput(GLFWwindow* window)
{
	// Closing program
	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
	{
		glfwSetWindowShouldClose(window, true);
	}
}

void mouse_callback(GLFWwindow* window, double xposIn, double yposIn)
{
	mouseX = (float)xposIn;
	mouseY = SCR_HEIGHT - (float)yposIn;
}

void mouse_button_callback(GLFWwindow* window, int button, int action,
	int mods)
{
	if (clicking && action == GLFW_RELEASE)
	{
		clicking = false;
	}

	if (!clicking)
	{
		if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS)
		{
			leftClick = true;
			clicking = true;
		}

		if (button == GLFW_MOUSE_BUTTON_RIGHT && action == GLFW_PRESS)
		{
			rightClick = true;
			clicking = true;
		}
	}
}

void framedelay()
{
	float deltaTime = (float)glfwGetTime() - lastFrame;
	float tick = 1.0f / framerate;

	if (deltaTime < tick)
	{
		std::this_thread::sleep_for(
			std::chrono::nanoseconds((int)((tick - deltaTime) * pow(10, 9))));
	}

	lastFrame = (float)glfwGetTime();
}