Updated source code to reflect content changes (code re-work): advanced OpenGL and model-loading.

src/4.advanced_opengl/1.1.depth_testing/1.1.depth_testing.vs

@@ -11,5 +11,5 @@ uniform mat4 projection;
 void main()
 {
     TexCoords = aTexCoords;    
-    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
 }

src/4.advanced_opengl/1.1.depth_testing/depth_testing.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -234,7 +234,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -254,7 +253,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)
@@ -284,7 +282,7 @@ void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
 
 // utility function for loading a 2D texture from file
 // ---------------------------------------------------
-unsigned int loadTexture(char const * path)
+unsigned int loadTexture(char const *path)
 {
     unsigned int textureID;
     glGenTextures(1, &textureID);

src/4.advanced_opengl/1.2.depth_testing_view/1.2.depth_testing.vs

@@ -7,5 +7,5 @@ uniform mat4 projection;
 
 void main()
 {
-    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
 }

src/4.advanced_opengl/1.2.depth_testing_view/depth_testing_view.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -234,7 +234,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -254,7 +253,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)
@@ -284,7 +282,7 @@ void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
 
 // utility function for loading a 2D texture from file
 // ---------------------------------------------------
-unsigned int loadTexture(char const * path)
+unsigned int loadTexture(char const *path)
 {
     unsigned int textureID;
     glGenTextures(1, &textureID);

src/4.advanced_opengl/10.1.instancing_quads/instancing_quads.cpp

@@ -24,13 +24,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
 
     // glad: load all OpenGL function pointers
     // ---------------------------------------

src/4.advanced_opengl/10.2.asteroids/asteroids.cpp

@@ -44,13 +44,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -169,7 +169,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -189,7 +188,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/10.3.asteroids_instanced/asteroids_instanced.cpp

@@ -44,13 +44,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -211,7 +211,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -231,7 +230,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/11.anti_aliasing_offscreen/anti_aliasing_offscreen.cpp

@@ -44,13 +44,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -224,7 +224,7 @@ int main()
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
         glEnable(GL_DEPTH_TEST);
 
-        // Set transformation matrices		
+        // set transformation matrices		
         shader.use();
         glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 1000.0f);
         shader.setMat4("projection", projection);
@@ -245,7 +245,7 @@ int main()
         glClear(GL_COLOR_BUFFER_BIT);
         glDisable(GL_DEPTH_TEST);
 
-        // Draw Screen quad
+        // draw Screen quad
         screenShader.use();
         glBindVertexArray(quadVAO);
         glActiveTexture(GL_TEXTURE0);
@@ -269,7 +269,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -289,7 +288,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -277,7 +277,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -297,7 +296,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/3.1.blending_discard/3.1.blending.vs

@@ -11,5 +11,5 @@ uniform mat4 projection;
 void main()
 {
     TexCoords = aTexCoords;
-    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
 }

src/4.advanced_opengl/3.1.blending_discard/blending_discard.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -277,7 +277,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -297,7 +296,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/3.2.blending_sort/3.2.blending.vs

@@ -1,14 +1,15 @@
 #version 330 core
-out vec4 FragColor;
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec2 aTexCoords;
 
-in vec2 TexCoords;
+out vec2 TexCoords;
 
-uniform sampler2D texture1;
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
 
 void main()
 {
-    vec4 texColor = texture(texture1, TexCoords);
+    TexCoords = aTexCoords;
-    if(texColor.a < 0.1)
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
-        discard;
-    FragColor = texColor;
 }

src/4.advanced_opengl/3.2.blending_sort/blending_sorted.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -75,7 +75,7 @@ int main()
 
     // build and compile shaders
     // -------------------------
-    Shader shader("3.1.blending.vs", "3.1.blending.fs");
+    Shader shader("3.2.blending.vs", "3.2.blending.fs");
 
     // set up vertex data (and buffer(s)) and configure vertex attributes
     // ------------------------------------------------------------------
@@ -288,7 +288,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -308,7 +307,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/5.1.framebuffers/framebuffers.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -304,7 +304,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -324,7 +323,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/5.2.framebuffers_exercise1/5.2.framebuffers.fs

@@ -0,0 +1,11 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D texture1;
+
+void main()
+{    
+    FragColor = texture(texture1, TexCoords);
+}

src/4.advanced_opengl/5.2.framebuffers_exercise1/5.2.framebuffers.vs

@@ -0,0 +1,15 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec2 aTexCoords;
+
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    TexCoords = aTexCoords;    
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
+}

src/4.advanced_opengl/5.2.framebuffers_exercise1/5.2.framebuffers_screen.fs

@@ -0,0 +1,12 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+
+void main()
+{
+    vec3 col = texture(screenTexture, TexCoords).rgb;
+    FragColor = vec4(col, 1.0);
+} 

src/4.advanced_opengl/5.2.framebuffers_exercise1/5.2.framebuffers_screen.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexCoords;
+
+out vec2 TexCoords;
+
+void main()
+{
+    TexCoords = aTexCoords;
+    gl_Position = vec4(aPos.x, aPos.y, 0.0, 1.0); 
+}  

src/4.advanced_opengl/5.2.framebuffers_exercise1/framebuffers_exercise1.cpp

@@ -45,13 +45,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -73,8 +73,8 @@ int main()
 
     // build and compile shaders
     // -------------------------
-    Shader shader("5.1.framebuffers.vs", "5.1.framebuffers.fs");
+    Shader shader("5.2.framebuffers.vs", "5.2.framebuffers.fs");
-    Shader screenShader("5.1.framebuffers_screen.vs", "5.1.framebuffers_screen.fs");
+    Shader screenShader("5.2.framebuffers_screen.vs", "5.2.framebuffers_screen.fs");
 
     // set up vertex data (and buffer(s)) and configure vertex attributes
     // ------------------------------------------------------------------
@@ -338,7 +338,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -358,7 +357,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/6.1.cubemaps_skybox/6.1.cubemaps.vs

@@ -11,5 +11,5 @@ uniform mat4 projection;
 void main()
 {
     TexCoords = aTexCoords;    
-    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
 }

src/4.advanced_opengl/6.1.cubemaps_skybox/cubemaps_skybox.cpp

@@ -46,13 +46,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -284,7 +284,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -304,7 +303,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)
@@ -386,10 +384,10 @@ unsigned int loadCubemap(vector<std::string> faces)
     glGenTextures(1, &textureID);
     glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
 
-    int width, height, nrComponents;
+    int width, height, nrChannels;
     for (unsigned int i = 0; i < faces.size(); i++)
     {
-        unsigned char *data = stbi_load(faces[i].c_str(), &width, &height, &nrComponents, 0);
+        unsigned char *data = stbi_load(faces[i].c_str(), &width, &height, &nrChannels, 0);
         if (data)
         {
             glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);

src/4.advanced_opengl/6.2.cubemaps_environment_mapping/6.2.skybox.fs

@@ -0,0 +1,11 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec3 TexCoords;
+
+uniform samplerCube skybox;
+
+void main()
+{    
+    FragColor = texture(skybox, TexCoords);
+}

src/4.advanced_opengl/6.2.cubemaps_environment_mapping/6.2.skybox.vs

@@ -0,0 +1,14 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+
+out vec3 TexCoords;
+
+uniform mat4 projection;
+uniform mat4 view;
+
+void main()
+{
+    TexCoords = aPos;
+    vec4 pos = projection * view * vec4(aPos, 1.0);
+    gl_Position = pos.xyww;
+}  

src/4.advanced_opengl/6.2.cubemaps_environment_mapping/cubemaps_environment_mapping.cpp

@@ -46,13 +46,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -75,7 +75,7 @@ int main()
     // build and compile shaders
     // -------------------------
     Shader shader("6.2.cubemaps.vs", "6.2.cubemaps.fs");
-    Shader skyboxShader("6.1.skybox.vs", "6.1.skybox.fs");
+    Shader skyboxShader("6.2.skybox.vs", "6.2.skybox.fs");
 
     // set up vertex data (and buffer(s)) and configure vertex attributes
     // ------------------------------------------------------------------
@@ -283,7 +283,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -303,7 +302,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/8.advanced_glsl_ubo/advanced_glsl_ubo.cpp

@@ -43,13 +43,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
 
@@ -232,7 +232,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -252,7 +251,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/9.1.geometry_shader_houses/geometry_shader_houses.cpp

@@ -24,13 +24,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
 
     // glad: load all OpenGL function pointers
     // ---------------------------------------

src/4.advanced_opengl/9.2.geometry_shader_exploding/geometry_shader_exploding.cpp

@@ -44,13 +44,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -129,7 +129,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -149,7 +148,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)

src/4.advanced_opengl/9.3.geometry_shader_normals/normal_visualization.cpp

@@ -44,13 +44,13 @@ int main()
     // glfw window creation
     // --------------------
     GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
-    glfwMakeContextCurrent(window);
     if (window == NULL)
     {
         std::cout << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
         return -1;
     }
+    glfwMakeContextCurrent(window);
     glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetCursorPosCallback(window, mouse_callback);
     glfwSetScrollCallback(window, scroll_callback);
@@ -135,7 +135,6 @@ void processInput(GLFWwindow *window)
     if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
         glfwSetWindowShouldClose(window, true);
 
-    float cameraSpeed = 2.5 * deltaTime;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
         camera.ProcessKeyboard(FORWARD, deltaTime);
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
@@ -155,7 +154,6 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     glViewport(0, 0, width, height);
 }
 
-
 // glfw: whenever the mouse moves, this callback is called
 // -------------------------------------------------------
 void mouse_callback(GLFWwindow* window, double xpos, double ypos)