lets use opengl instead

Makefile

@@ -1,7 +1,8 @@
 CC=g++
 
-CFLAGS= -c -g -Wall $(shell pkg-config --cflags gtkmm-4.0)
-LDLIBS = $(shell pkg-config --libs gtkmm-4.0)
+CFLAGS= -c -g -Wall
+
+LDLIBS = -lglfw
 
 TARGET := untap
 
@@ -9,16 +10,24 @@ BUILD_DIR := ./build
 SRC_DIRS := ./src
 
 SRCS := $(shell find $(SRC_DIRS) -name '*.cpp')
+SRCS += $(shell find $(SRC_DIRS) -name '*.c')
 
 OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
 
 $(BUILD_DIR)/$(TARGET): $(OBJS)
 	$(CC) $(OBJS) -o $@ $(LDLIBS)
+	cp -r $(SRC_DIRS)/shaders $(BUILD_DIR)/
+	cp -r $(SRC_DIRS)/textures $(BUILD_DIR)/
 
 $(BUILD_DIR)/%.cpp.o: %.cpp
 	mkdir -p $(dir $@)
 	$(CC) $(CFLAGS) -c $< -o $@
 
+$(BUILD_DIR)/%.c.o: %.c
+	mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+
 .PHONY: clean
 clean:
 	rm -rf $(BUILD_DIR)

build/shaders/shader.fs

@@ -0,0 +1,14 @@
+#version 330 core
+
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+
+uniform sampler2D texture1;
+uniform sampler2D texture2;
+
+void main()
+{
+	FragColor = texture(texture2, TexCoord);
+}

build/shaders/shader.vs

@@ -0,0 +1,15 @@
+#version 330 core
+
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec2 aTexCoord;
+
+out vec3 ourColor;
+out vec2 TexCoord;
+
+void main()
+{
+	gl_Position = vec4(aPos, 1.0);
+	ourColor = aColor;
+	TexCoord = aTexCoord;
+}

src/helloworld.cpp

@@ -1,24 +0,0 @@
-#include "include/helloworld.h"
-
-#include <iostream>
-
-HelloWorld::HelloWorld()
-	: m_button("Hello world!")
-{
-	m_button.set_margin(10);
-
-	m_button.signal_clicked().connect(sigc::mem_fun(*this,
-				&HelloWorld::on_button_clicked));
-
-	set_child(m_button);
-}
-
-HelloWorld::~HelloWorld()
-{
-
-}
-
-void HelloWorld::on_button_clicked()
-{
-	std::cout << "Hello, World!" << std::endl;
-}

src/include/helloworld.h

@@ -1,19 +0,0 @@
-#ifndef GTKMM_EXAMPLE_HELLOWORLD_H
-#define GTKMM_EXAMPLE_HELLOWORLD_H
-
-#include <gtkmm/button.h>
-#include <gtkmm/window.h>
-
-class HelloWorld : public Gtk::Window
-{
-	public:
-		HelloWorld();
-		~HelloWorld() override;
-
-	protected:
-		void on_button_clicked();
-
-		Gtk::Button m_button;
-};
-
-#endif

src/include/shader.h

@@ -0,0 +1,114 @@
+#ifndef SHADER_H
+#define SHADER_H
+
+#include "glad.h"
+
+#include <string>
+#include <fstream>
+#include <sstream>
+#include <iostream>
+
+class Shader
+{
+public:
+	// program ID
+	unsigned int ID;
+	
+	// constructor reads and builds the shader
+	Shader(const char* vertexPath, const char* fragmentPath)
+	{
+		std::string vertexCode;
+		std::string fragmentCode;
+		std::ifstream vShaderFile;
+		std::ifstream fShaderFile;
+
+		// setup exceptions for bad files
+		vShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+		fShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+		try {
+			// open files
+			vShaderFile.open(vertexPath);
+			fShaderFile.open(fragmentPath);
+			std::stringstream vShaderStream, fShaderStream;
+	
+			// read file buffers into streams
+			vShaderStream << vShaderFile.rdbuf();
+			fShaderStream << fShaderFile.rdbuf();
+
+			// close file handlers
+			vShaderFile.close();
+			fShaderFile.close();
+
+			// convert stream into string
+			vertexCode = vShaderStream.str();
+			fragmentCode = fShaderStream.str();
+		} catch (std::ifstream::failure& e) {
+			std::cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ:" << e.what() << "\n";
+		}
+
+		const char* vShaderCode = vertexCode.c_str();
+		const char* fShaderCode = fragmentCode.c_str();
+
+		unsigned int vertex, fragment;
+		int success;
+		char infoLog[512];
+		vertex = glCreateShader(GL_VERTEX_SHADER);
+
+		glShaderSource(vertex, 1, &vShaderCode, NULL);
+		glCompileShader(vertex);
+
+		glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
+		if (!success) {
+			glGetShaderInfoLog(vertex, 512, NULL, infoLog);
+			std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << "\n";
+		}
+
+		fragment = glCreateShader(GL_FRAGMENT_SHADER);
+		glShaderSource(fragment, 1, &fShaderCode, NULL);
+		glCompileShader(fragment);
+
+		glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
+		if (!success) {
+			glGetShaderInfoLog(fragment, 512, NULL, infoLog);
+			std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << "\n";
+		}
+
+		ID = glCreateProgram();
+		glAttachShader(ID, vertex);
+		glAttachShader(ID, fragment);
+		glLinkProgram(ID);
+
+		glGetProgramiv(ID, GL_LINK_STATUS, &success);
+		if (!success) {
+			glGetProgramInfoLog(ID, 512, NULL, infoLog);
+			std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << "\n";
+		}
+
+		// delete shaders, no longer needed
+		glDeleteShader(vertex);
+		glDeleteShader(fragment);
+
+	}
+
+	// use/activate the shader
+	void use()
+	{
+		glUseProgram(ID);
+	}
+	
+	// utility uniform functions
+	void setBool(const std::string &name, bool value) const
+	{
+		glUniform1i(glGetUniformLocation(ID, name.c_str()), (int) value);
+	}
+	void setInt(const std::string &name, int value) const
+	{
+		glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
+	}
+	void setFloat(const std::string &name, float value) const
+	{
+		glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
+	}
+};
+
+#endif

src/main.cpp

@@ -1,10 +1,184 @@
-#include "include/helloworld.h"
+#include "include/glad.h"
+#include "include/shader.h"
+#include "include/stb_image.h"
 
-#include <gtkmm/application.h>
+#include <GLFW/glfw3.h>
+#include <iostream>
+#include <math.h>
 
-int main(int argc, char* argv[])
+void framebuffer_size_callback(GLFWwindow* window, int width, int height);
+void processInput(GLFWwindow* window);
+void setupGLFW(GLFWwindow** window);
+
+typedef struct {
+	int width, height, nrChannels;
+	unsigned char* data;
+} texture_t;
+
+float vertices[] = {
+	// positions      colours            texture coords
+	0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top right
+	0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom right
+	-0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom left
+	-0.5f, 0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f // bottom left
+};
+
+unsigned int indices[] = {
+	0, 1, 3,
+	1, 2, 3
+};
+	
+bool wireframe = false;
+
+int main()
 {
-	auto app = Gtk::Application::create("org.gtkmm.example");
+	GLFWwindow* window;
+	setupGLFW(&window);
+
+
+	Shader myShader("shaders/shader.vs", "shaders/shader.fs");
+
+	texture_t tex;
+	tex.data = stbi_load("textures/container.jpg", &tex.width, &tex.height, &tex.nrChannels, 0);
+
+	unsigned int texture1;
+	glGenTextures(1, &texture1);
+	glBindTexture(GL_TEXTURE_2D, texture1);
+	
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+	if (tex.data) {
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex.width, tex.height, 0, GL_RGB, GL_UNSIGNED_BYTE, tex.data);
+		glGenerateMipmap(GL_TEXTURE_2D);
+	} else {
+		std::cout << "Failed to load texture\n";
+	}
+	
+	stbi_image_free(tex.data);
+
+	stbi_set_flip_vertically_on_load(true);
+	tex.data = stbi_load("textures/wg.jpg", &tex.width, &tex.height, &tex.nrChannels, 0);
+
+	unsigned int texture2;
+	glGenTextures(1, &texture2);
+	glBindTexture(GL_TEXTURE_2D, texture2);
+	
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+	if (tex.data) {
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex.width, tex.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex.data);
+		glGenerateMipmap(GL_TEXTURE_2D);
+	} else {
+		std::cout << "Failed to load texture\n";
+	}
+	
+	stbi_image_free(tex.data);
+
+	
+	unsigned int VAO;
+	glGenVertexArrays(1, &VAO);
+
+	unsigned int VBO;
+	glGenBuffers(1, &VBO);
+
+	unsigned int EBO;
+	glGenBuffers(1, &EBO);
+
+	// bind Vertex Array Object
+	glBindVertexArray(VAO);
+	// copy our vertices into a buffer for opengl to use
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	// copy our indices
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+	
+	// set the vertex attributes pointers
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*) 0);
+	glEnableVertexAttribArray(0);
+
+	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*) (3 * sizeof(float)));
+	glEnableVertexAttribArray(1);
+
+	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*) (6 * sizeof(float)));
+	glEnableVertexAttribArray(2);
+
+	myShader.use();
+	myShader.setInt("texture1", 0);
+	myShader.setInt("texture2", 1);
+
+
+	while(!glfwWindowShouldClose(window)) {
+		//input
+		processInput(window);
+
+		//rendering
+		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT);
+
+		myShader.use();
+		
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, texture1);	
+		glActiveTexture(GL_TEXTURE1);
+		glBindTexture(GL_TEXTURE_2D, texture2);
+
+		glBindVertexArray(VAO);
+		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+		glBindVertexArray(0); // unbinds the VAO so its ready to be bound again for the next render
+
+		// check and call events and swap buffers
+		glfwSwapBuffers(window);
+		glfwPollEvents();
+	}
+
+	glfwTerminate();
+	return 0;
+}
+
+void setupGLFW(GLFWwindow** window)
+{
+	glfwInit();
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+	*window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
+	if (window == NULL) {
+		std::cout << "Failed to create GLFW window\n";
+		glfwTerminate();
+		exit(-1);
+	}
+	glfwMakeContextCurrent(*window);
+
+	if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
+		std::cout << "Failed to init GLAD\n";
+		exit(-1);
+	}
+
+	glViewport(0, 0, 800, 600);
+	glfwSetFramebufferSizeCallback(*window, framebuffer_size_callback);
+}
+
+
+void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+	glViewport(0, 0, width, height);
+}
+
+void processInput(GLFWwindow* window)
+{
+	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+		glfwSetWindowShouldClose(window, true);
+	if (glfwGetKey(window, GLFW_KEY_ENTER) == GLFW_PRESS) // triggers wireframe mode
+		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	if (glfwGetKey(window, GLFW_KEY_BACKSPACE) == GLFW_PRESS) // disables wireframe mode
+		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 
-	return app->make_window_and_run<HelloWorld>(argc, argv);
 }

src/shaders/shader.fs

@@ -0,0 +1,14 @@
+#version 330 core
+
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+
+uniform sampler2D texture1;
+uniform sampler2D texture2;
+
+void main()
+{
+	FragColor = texture(texture2, TexCoord);
+}

src/shaders/shader.vs

@@ -0,0 +1,15 @@
+#version 330 core
+
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec2 aTexCoord;
+
+out vec3 ourColor;
+out vec2 TexCoord;
+
+void main()
+{
+	gl_Position = vec4(aPos, 1.0);
+	ourColor = aColor;
+	TexCoord = aTexCoord;
+}

src/stb_image.cpp

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "include/stb_image.h"