Added debugging component to lab with verifyVAO

src/glrenderer.cpp

@@ -53,6 +53,19 @@ void GLRenderer::initializeGL()
 
     // Task 13: Add position and color attributes to your VAO here
 
+    // Task 13: Verify your position and color attributes with our verifyVAO function
+
+    // Copy over your attributes from glVertexAttribPointer() to verifyVAO
+    // So the following function becomes:
+    // glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4, reinterpret_cast<void*>(0));
+    // verifyVAO(triangleData, 0, 2, 4, reinterpret_cast<void*>(0));
+    // If the function prints the values you would expect for position and color then you're good!
+
+    //std::cout << "Position Values" << std::endl;
+    //verifyVAO();
+    //std::cout << "Color Values" << std::endl;
+    //verifyVAO();
+
     // ================== Returning to Default State
 
     // Task 14: Unbind your VBO and VAO here

src/glrenderer.h

@@ -8,6 +8,7 @@
 #include "GL/glew.h" // Must always be first include
 #include <QOpenGLWidget>
 #include "glm/glm.hpp"
+#include <iostream>
 
 class GLRenderer : public QOpenGLWidget
 {
@@ -24,4 +25,25 @@ class GLRenderer : public QOpenGLWidget
     GLuint m_shader; // Stores id of shader program
     GLuint m_vbo;    // Stores id of VBO
     GLuint m_vao;    // Stores id of VAO
+
+    void verifyVAO(std::vector<GLfloat> triangleData, GLuint index, GLsizei size, GLsizei stride, const void* offset) {
+
+        int newStride = int(stride / 4);
+        int groupNum = 0;
+        int newOffset = static_cast<int>(reinterpret_cast<intptr_t>(offset)) / 4;
+
+        for (int i = newOffset; i < triangleData.size(); i = i + newStride) {
+            std::cout << "Group " << groupNum << " of Values for VAO index " << index << std::endl;
+            std::cout << "[";
+            for (auto j = i; j < i + size; ++j) {
+              if (j != i + size - 1) {
+                  std::cout << triangleData[j]<< ", ";
+              } else {
+                  std::cout << triangleData[j]<< "]" << std::endl;
+              }
+            }
+            groupNum = groupNum + 1;
+        }
+        std::cout << "" << std::endl;
+    }
 };