draw the first triangle

src/main.cpp

@@ -32,6 +32,82 @@ int main()
 
 	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 
+	float vertices[] = {
+		-0.5f, -0.5f, 0.0f,
+		 0.5f, -0.5f, 0.0f,
+		 0.0f,  0.5f, 0.0f
+	};
+
+	unsigned int VBO;
+	glGenBuffers(1, &VBO);
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+	unsigned int VAO;
+	glGenVertexArrays(1, &VAO);
+	glBindVertexArray(VAO);
+
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+	glEnableVertexAttribArray(0); 
+
+	const char *vertexShaderSource = "#version 330 core\n"
+		"layout (location = 0) in vec3 aPos;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
+		"}\0";
+
+	const char *fragmentShaderSource = "#version 330 core\n"
+		"out vec4 FragColor;\n"
+		"void main()\n"
+		"{\n"
+    		"FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
+		"}\0";
+
+	unsigned int vertexShader;
+	vertexShader = glCreateShader(GL_VERTEX_SHADER);
+	glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
+
+	unsigned int fragmentShader;
+	fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+	glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
+
+	int  success;
+	char infoLog[512];
+
+	glCompileShader(vertexShader);
+
+	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
+	if(!success)
+	{
+	    glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
+	    std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
+	}
+
+	glCompileShader(fragmentShader);
+
+	glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
+	if(!success)
+	{
+	    glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
+	    std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
+	}
+
+	unsigned int shaderProgram;
+	shaderProgram = glCreateProgram();
+
+	glAttachShader(shaderProgram, vertexShader);
+	glAttachShader(shaderProgram, fragmentShader);
+	glLinkProgram(shaderProgram);
+	glDeleteShader(vertexShader);
+	glDeleteShader(fragmentShader);
+
+	glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
+	if(!success) {
+	    glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
+	    std::cout << "ERROR::SHADER_PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
+	}
+
 	while(!glfwWindowShouldClose(window))
 	{
 		processInput(window);
@@ -39,6 +115,10 @@ int main()
 		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();    
 	}