basic triangle

build.sh

@@ -1,2 +1,2 @@
 #!/usr/bin/env bash
-cd build && cmake .. && make && ./TimeCoil
+cd build && cmake -DCMAKE_C_FLAGS="-g" .. && make && ./TimeCoil

shaders/shader.frag

@@ -0,0 +1,6 @@
+#version 330 core
+out vec4 FragColor;
+void main()
+{
+    FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
+} 

shaders/shader.vert

@@ -0,0 +1,6 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+void main()
+{
+    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+}

src/main.cpp

@@ -1,6 +1,8 @@
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 #include <iostream>
+#include <fstream>
+#include <cstring>
 
 void framebufferSizeCallback(GLFWwindow *window, int width, int height) {
     glViewport(10, 10, width-10, height-10);
@@ -16,6 +18,78 @@ void renderGraphics(GLFWwindow *window) {
 
 }
 
+void gracefulExit(int code) {
+	glfwTerminate();
+	exit(code);
+}
+
+std::string readFile(std::string path) {
+	std::ifstream file(path);
+	if (!file.is_open())
+		std::cerr << "File " << path << " was not found." << std::endl;
+
+	std::string content = "";
+	std::string buffer = "";
+
+	while(getline(file, buffer)) {
+		content += buffer + "\n";
+	}
+
+	content += '\0';
+	std::cout << content << std::endl;
+	file.close();
+	return content;
+}
+
+unsigned int prepareShaders() {
+	unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
+	unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+
+	std::string vertexShaderSourceString = readFile("../shaders/shader.vert");
+	std::string fragmentShaderSourceString = readFile("../shaders/shader.frag");
+
+	const char *vertexShaderSource = vertexShaderSourceString.c_str();
+	const char *fragmentShaderSource = fragmentShaderSourceString.c_str();
+
+	glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
+	glCompileShader(vertexShader);
+
+	int success;
+	char log[512];
+	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(vertexShader, 512, NULL, log);
+		std::cerr << "Could not compile vertex shader: " << log << std::endl;
+		gracefulExit(-1);
+	}
+	glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
+	glCompileShader(fragmentShader);
+
+	glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(fragmentShader, 512, NULL, log);
+		std::cerr << "Could not compile fragment shader: " << log << std::endl;
+		gracefulExit(-1);
+	}
+
+	unsigned int shaderProgram;
+	shaderProgram = glCreateProgram();
+	glAttachShader(shaderProgram, vertexShader);
+	glAttachShader(shaderProgram, fragmentShader);
+	glLinkProgram(shaderProgram);
+
+	glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
+	if(!success) {
+    	glGetProgramInfoLog(shaderProgram, 512, NULL, log);
+		std::cerr << "Could not link program: " << log << std::endl;
+		gracefulExit(-1);
+	}
+
+	glDeleteShader(vertexShader);
+	glDeleteShader(fragmentShader);
+	return shaderProgram;
+}
+
 int main () {
 	glfwInit();
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
@@ -28,8 +102,7 @@ int main () {
 	GLFWwindow *window = glfwCreateWindow(800, 600, "TimeCoil", NULL, NULL);
 	if (window == NULL) {
 		std::cerr << "Failed to create GLFW window." << std::endl;
-		glfwTerminate();
-		return -1;
+		gracefulExit(-1);
 	}
 
 	glfwMakeContextCurrent(window);
@@ -40,16 +113,43 @@ int main () {
 		return -1;
 	}
 
+	unsigned int shaderProgram = prepareShaders();
+
+	float vertices[] = {
+		-0.5, 0.0, 0.0,
+		0.5, 0.5, 0.0,
+		0.5, -0.5, 0.0
+	};
+
+	unsigned int VBO, VAO;
+	glGenVertexArrays(1, &VAO);
+	glGenBuffers(1, &VBO);
+	glBindVertexArray(VAO);
+
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+	glEnableVertexAttribArray(0);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+	
 	while(!glfwWindowShouldClose(window)) {
 		processInput(window);
 
 		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT);
 	
+		glUseProgram(shaderProgram);
+		glBindVertexArray(VAO);
+		glDrawArrays(GL_TRIANGLES, 0, 3);
+
 	    glfwSwapBuffers(window);
 	    glfwPollEvents();
 	}
 
-	glfwTerminate();
-	return 0;
+	glDeleteVertexArrays(1, &VAO);
+    glDeleteBuffers(1, &VBO);
+    glDeleteProgram(shaderProgram);
+	gracefulExit(0);
 }