Digging on smart pointers

src/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory(core)
-add_subdirectory(opengl)
+add_subdirectory(opengl)
+add_subdirectory(misc)

src/misc/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_executable(
+  spointer
+  smartpointer.cpp
+)

src/misc/smartpointer.cpp

@@ -0,0 +1,71 @@
+#include "smartpointer.h"
+#include <memory>
+
+#define UPtr std::unique_ptr
+#define SPtr std::shared_ptr
+
+DummyObject::DummyObject(int num_elements)
+{
+  std::cout << "Constructor called " << num_elements << std::endl;
+  size = num_elements;
+  list_of_numbers = new int[size];
+}
+
+DummyObject::~DummyObject()
+{
+  std::cout << "Destructor called " << size << std::endl;
+  delete[] list_of_numbers;
+}
+
+DummyObject::DummyObject(const DummyObject &other)
+{
+  std::cout << "Copy constructor called " << other.size << std::endl;
+  list_of_numbers = new int[other.size];
+  for (int i = 0; i < other.size; i++)
+  {
+    list_of_numbers[i] = other.list_of_numbers[i];
+  }
+  size = other.size;
+}
+
+DummyObject::DummyObject(DummyObject&& moved)
+{
+  std::cout << "Move constructor called " << moved.size << std::endl;
+}
+
+void DummyObject::doSomething()
+{
+  std::cout << "This do amazing stuff: " << size << std::endl;
+}
+
+DummyObject createDummy(int size)
+{
+  DummyObject d(size);
+  return d;
+}
+
+int main(void)
+{
+  std::cout << "Smart pointer examples" << std::endl;
+
+  DummyObject d(15);
+  DummyObject copy = d;
+
+  DummyObject *dmtPtr = new DummyObject(20);
+  UPtr<DummyObject> dmySmtPtr = UPtr<DummyObject>(new DummyObject(30));
+
+  dmySmtPtr->doSomething();
+  dmtPtr->doSomething();
+
+  SPtr<DummyObject> firstSmtPtr = SPtr<DummyObject>(dmtPtr);
+  SPtr<DummyObject> secondSmtPtr = firstSmtPtr;
+
+  DummyObject retDummy = createDummy(32);
+  DummyObject secondDummy = std::move(retDummy);
+
+  retDummy.doSomething();
+  secondDummy.doSomething();
+
+  firstSmtPtr->doSomething();
+  secondSmtPtr->doSomething();
+}

src/misc/smartpointer.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <iostream>
+
+class DummyObject {
+  public:
+  DummyObject(int);                  //Constructor
+  ~DummyObject();                         //destructor
+  DummyObject(const DummyObject&);  //copy constructor
+  DummyObject(DummyObject&&); //move constructor
+
+  void doSomething();
+
+
+  private:
+  int size;
+  int* list_of_numbers;
+
+};

src/opengl/CMakeLists.txt

@@ -1,7 +1,7 @@
 # Search for glfw
 find_package(glfw3 3.3 REQUIRED)
 # Search for glew
-find_package(GLEW REQUIRED)
+find_package(glew REQUIRED)
 # Search for OpenGL
 find_package(OpenGL REQUIRED)
 add_compile_definitions(IS_DEBUG=1)
@@ -22,9 +22,10 @@ add_executable(
 )
 
 
-# Link gl1 with glew
-#target_link_libraries(gl1 glew)
+target_link_libraries(gl1 /usr/local/lib/libGLEW.2.2.0.dylib)
 # Link gl1 with glfw lib
 target_link_libraries(gl1 glfw)
+# Link gl1 with glew
+#target_link_libraries(gl1 glew)
 # Link gl1 with OpenGL
 target_link_libraries(gl1 OpenGL::GL)

src/opengl/gl1.cpp

@@ -15,127 +15,64 @@
 
 const std::string SHADERS_PATH = "src/opengl/res/shaders/Basic.shader";
 
+static void error_callback(int error, const char *description)
+{
+    fputs(description, stderr);
+}
+static void key_callback(GLFWwindow *window, int key, int scancode, int action, int mods)
+{
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, GL_TRUE);
+}
+
 int main(void)
 {
-    LOG("Start OpenGL Demo");
     GLFWwindow *window;
-    //glDebugMessageCallback(ErrorGLCallback,0); Enable when glew installed properly
-
-    /* Initialize the library */
-    LOG("Initialize glfw");
+    glfwSetErrorCallback(error_callback);
     if (!glfwInit())
-        return -1;
-
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); 
-    glfwWindowHint(GLFW_OPENGL_PROFILE,GLFW_OPENGL_CORE_PROFILE);
-    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); 
-    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
-
-    /* Create a windowed mode window and its OpenGL context */
-    LOG("Create Window");
-    //glfwCreateWindow(640, 480, "OpenGL Window", NULL, NULL);
-    //GLCall(window = glfwCreateWindow(640, 480, "OpenGL Window", NULL, NULL));
-    
-    window = glfwCreateWindow(640, 480, "OpenGL Window", NULL, NULL);
-    
+        exit(EXIT_FAILURE);
+    window = glfwCreateWindow(640, 480, "Simple example", NULL, NULL);
     if (!window)
     {
-        LOG("Terminate because not window");
         glfwTerminate();
-        return -1;
+        exit(EXIT_FAILURE);
     }
 
-    /* Make the window's context current */
-    LOG("GLFW Make context");
     glfwMakeContextCurrent(window);
-    glfwSwapInterval(1);
+    glfwSetKeyCallback(window, key_callback);
 
-    GLPrintVersion();
+    int major, minor, revision;
+    glfwGetVersion(&major, &minor, &revision);
 
-    float positions[] =
-        {
-            -0.5f, -0.5f,
-            0.5f, -0.5f,
-            0.5f, 0.5f,
-            -0.5f, 0.5f};
+    printf("Running against GLFW %i.%i.%i\n", major, minor, revision);
+    LOG(glfwGetVersionString());
 
-    unsigned int indexes[] = {
-        0, 1, 2, 2, 3, 0};
-
-    //Create buffer
-    //Buffer id
-    VertexArray va;
-
-    LOG("VertexBuffer to be created");
-    VertexBuffer vb(positions, 4 * 2 * sizeof(float));
-    //LOG("Create VertexBuffer: " << vb);
-    
-    VertexBufferLayout layout;
-    layout.Push<float>(2);
-    va.AddBuffer(vb,layout);
-
-    IndexBuffer ib(indexes,6);
-
-    Shader shader(SHADERS_PATH);
-    shader.Bind();
-    shader.SetUniform4f("u_Color",0.2f, 0.3f, 0.8f, 1.0f);
-
-    va.Unbind();
-    vb.Unbind();
-    ib.Unbind();
-    shader.Unbind();  
-
-    Renderer renderer;
-
-    float red = 0.0f;
-    float increment = 0.05f;
-    /* Loop until the user closes the window */
     while (!glfwWindowShouldClose(window))
     {
-        /* Render here */
-        GLCall(glClear(GL_COLOR_BUFFER_BIT));
-
-        // Legacy OpenGL
-        //glBegin(GL_TRIANGLES);
-        //glVertex2f(-1.0f, -1.0f);
-        //glVertex2f(0.0f, 1.0f);
-        //glVertex2f(1.0f, -1.0f);
-        //glEnd();
-
-        //Modern OpenGL
-        //without index buffer
-        //glDrawArrays(GL_TRIANGLES, 0, 12);
-        //GLClearError();
-
-        //GLCall(glUseProgram(shader));
-
-        //GLCall(glUniform4f(uniform_location, 0.2f, 0.3f, 0.8f, 1.0f));
-
-        //ib.Bind();
-
-        //GLCall(glDrawElements(GL_TRIANGLES, 6 * sizeof(uint), GL_UNSIGNED_INT, nullptr));
-
-        shader.Bind();
-        shader.SetUniform4f("u_Color",red, 0.3f, 0.8f, 1.0f);
-
-        renderer.draw(va,ib,shader);
-
-        if (red > 1.0f)
-            increment = -0.05f;
-        else if (red < 0.0f)
-            increment = 0.05f;
-        red += increment;
-
-        //GLCheckError();
-        /* Swap front and back buffers */
+        float ratio;
+        int width, height;
+        glfwGetFramebufferSize(window, &width, &height);
+        ratio = width / (float)height;
+        glViewport(0, 0, width, height);
+        glClear(GL_COLOR_BUFFER_BIT);
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        glOrtho(-ratio, ratio, -1.f, 1.f, 1.f, -1.f);
+        glMatrixMode(GL_MODELVIEW);
+        glLoadIdentity();
+        glRotatef((float)glfwGetTime() * 50.f, 0.f, 0.f, 1.f);
+        glBegin(GL_TRIANGLES);
+        glColor3f(1.f, 0.f, 0.f);
+        glVertex3f(-0.6f, -0.4f, 0.f);
+        glColor3f(0.f, 1.f, 0.f);
+        glVertex3f(0.6f, -0.4f, 0.f);
+        glColor3f(0.f, 0.f, 1.f);
+        glVertex3f(0.f, 0.6f, 0.f);
+        glEnd();
         glfwSwapBuffers(window);
-
-        /* Poll for and process events */
         glfwPollEvents();
     }
-
+    glfwDestroyWindow(window);
     glfwTerminate();
-    
-    return 0;
+    exit(EXIT_SUCCESS);
 }