Merge pull request #1 from MichaelFisher1997/openGL-abstraction

Open gl abstraction

.vscode/c_cpp_properties.json

@@ -0,0 +1,16 @@
+{
+  "configurations": [
+    {
+      "name": "linux-gcc-x64",
+      "includePath": [
+        "${workspaceFolder}/**"
+      ],
+      "defines": [],
+      "compilerPath": "/nix/store/xcn9p4xxfbvlkpah7pwchpav4ab9d135-gcc-wrapper-14-20241116/bin/gcc",
+      "cStandard": "c17",
+      "cppStandard": "gnu++17",
+      "intelliSenseMode": "linux-gcc-x64"
+    }
+  ],
+  "version": 4
+}

.vscode/launch.json

@@ -0,0 +1,55 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "cppdbg",
+      "request": "launch",
+      "name": "Launch Program",
+      "program": "${workspaceFolder}/build/${input:executableName}",
+      "preLaunchTask": "build",
+      "args": [],
+      "stopAtEntry": false,
+      "cwd": "${workspaceFolder}",
+      "environment": [],
+      "externalConsole": false,
+      "MIMode": "gdb",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        }
+      ],
+      "miDebuggerPath": "/usr/bin/gdb",
+      "logging": {
+        "engineLogging": true
+      }
+    },
+    {
+      "name": "C/C++ Runner: Debug Session",
+      "type": "cppdbg",
+      "request": "launch",
+      "args": [],
+      "stopAtEntry": false,
+      "externalConsole": false,
+      "cwd": "/home/micqdf/opengl/cpp/src",
+      "program": "/home/micqdf/opengl/cpp/src/build/Debug/outDebug",
+      "MIMode": "gdb",
+      "miDebuggerPath": "/nix/store/xcn9p4xxfbvlkpah7pwchpav4ab9d135-gdb-wrapper-14-20241116/bin/gcc",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        }
+      ]
+    }
+  ],
+  "inputs": [
+    {
+      "type": "promptString",
+      "id": "executableName",
+      "description": "Name of your executable"
+    }
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,61 @@
+{
+  "C_Cpp_Runner.cCompilerPath": "/nix/store/xcn9p4xxfbvlkpah7pwchpav4ab9d135-gcc-wrapper-14-20241116/bin/gcc",
+  "C_Cpp_Runner.cppCompilerPath": "/nix/store/xcn9p4xxfbvlkpah7pwchpav4ab9d135-g++-wrapper-14-20241116/bin/gcc",
+  "C_Cpp_Runner.debuggerPath": "/nix/store/xcn9p4xxfbvlkpah7pwchpav4ab9d135-gdb-wrapper-14-20241116/bin/gcc",
+  "C_Cpp_Runner.cStandard": "c17",
+  "C_Cpp_Runner.cppStandard": "gnu++17",
+  "C_Cpp_Runner.msvcBatchPath": "",
+  "C_Cpp_Runner.useMsvc": false,
+  "C_Cpp_Runner.warnings": [
+    "-Wall",
+    "-Wextra",
+    "-Wpedantic",
+    "-Wshadow",
+    "-Wformat=2",
+    "-Wcast-align",
+    "-Wconversion",
+    "-Wsign-conversion",
+    "-Wnull-dereference"
+  ],
+  "C_Cpp_Runner.msvcWarnings": [
+    "/W4",
+    "/permissive-",
+    "/w14242",
+    "/w14287",
+    "/w14296",
+    "/w14311",
+    "/w14826",
+    "/w44062",
+    "/w44242",
+    "/w14905",
+    "/w14906",
+    "/w14263",
+    "/w44265",
+    "/w14928"
+  ],
+  "C_Cpp_Runner.enableWarnings": true,
+  "C_Cpp_Runner.warningsAsError": false,
+  "C_Cpp_Runner.compilerArgs": [],
+  "C_Cpp_Runner.linkerArgs": [],
+  "C_Cpp_Runner.includePaths": [
+    "${workspaceFolder}/**"
+  ],
+  "C_Cpp_Runner.includeSearch": [
+    "*",
+    "**/*"
+  ],
+  "C_Cpp_Runner.excludeSearch": [
+    "**/build",
+    "**/build/**",
+    "**/.*",
+    "**/.*/**",
+    "**/.vscode",
+    "**/.vscode/**"
+  ],
+  "C_Cpp_Runner.useAddressSanitizer": false,
+  "C_Cpp_Runner.useUndefinedSanitizer": false,
+  "C_Cpp_Runner.useLeakSanitizer": false,
+  "C_Cpp_Runner.showCompilationTime": false,
+  "C_Cpp_Runner.useLinkTimeOptimization": false,
+  "C_Cpp_Runner.msvcSecureNoWarnings": false
+}

MakeFile

@@ -1,41 +0,0 @@
-# A simple Makefile for compiling small SDL projects
-
-# set the compiler
-CC := clang
-
-# set the compiler flags
-CFLAGS := `sdl2-config --libs --cflags` -ggdb3 -O0 --std=c99 -Wall -lSDL2_image -lm
-# add header files here
-HDRS :=
-
-# add source files here
-SRCS := #file-name.c
-
-# generate names of object files
-OBJS := $(SRCS:.c=.o)
-
-# name of executable
-EXEC := #name your executable file
-
-# default recipe
-all: $(EXEC)
- 
-showfont: showfont.c Makefile
-    $(CC) -o $@ $@.c $(CFLAGS) $(LIBS)
-
-glfont: glfont.c Makefile
-    $(CC) -o $@ $@.c $(CFLAGS) $(LIBS)
-
-# recipe for building the final executable
-$(EXEC): $(OBJS) $(HDRS) Makefile
-    $(CC) -o $@ $(OBJS) $(CFLAGS)
-
-# recipe for building object files
-#$(OBJS): $(@:.o=.c) $(HDRS) Makefile
-#    $(CC) -o $@ $(@:.o=.c) -c $(CFLAGS)
-
-# recipe to clean the workspace
-clean:
-    rm -f $(EXEC) $(OBJS)
-
-.PHONY: all clean

Makefile

@@ -0,0 +1,38 @@
+# Compiler and flags
+CXX := g++
+CXXFLAGS := -g #-O0 -Wall -Wextra
+
+# Libraries
+LDFLAGS := -lSDL2 -lGLEW -lGL
+
+# Source and output directories
+SRC_DIR := src
+BUILD_DIR := build
+TARGET := $(BUILD_DIR)/opengl
+
+# Source files and object files
+SRC := $(wildcard $(SRC_DIR)/*.cpp)
+OBJ := $(SRC:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)
+
+# Default target
+all: $(TARGET)
+
+# Build the target executable
+$(TARGET): $(OBJ)
+	mkdir -p $(BUILD_DIR)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LDFLAGS)
+
+# Build object files
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp
+	mkdir -p $(BUILD_DIR)
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+# Clean up build files
+clean:
+	rm -rf $(BUILD_DIR)
+
+# Run the application
+run: $(TARGET)
+	./$(TARGET)
+
+.PHONY: all clean run

src/IndexBuffer.cpp

@@ -0,0 +1,60 @@
+#include "IndexBuffer.h"
+#include "Renderer.h"
+
+IndexBuffer::IndexBuffer(const unsigned int* data, unsigned int count)
+  : m_Count(count)
+{
+  ASSERT(sizeof(unsigned int) == sizeof(GLuint));
+  //
+  //std::cout << "m_RendererID: " << &m_RendererID << " " << m_RendererID << std::endl; 
+  GLCall(glGenBuffers(1, &m_RendererID));
+  GLCall(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_RendererID)); //select buffer called 'buffer'
+  GLCall(glBufferData(GL_ELEMENT_ARRAY_BUFFER, count * sizeof(unsigned int), data, GL_STATIC_DRAW)); // assigne buffer size, static as we use many times, but does not change
+}
+
+// Destructor
+IndexBuffer::~IndexBuffer() {
+    if (m_RendererID != 0) { // Only delete if valid
+        GLCall(glDeleteBuffers(1, &m_RendererID));
+        std::cout << "IndexBuffer destroyed with RendererID: " << m_RendererID << std::endl;
+    }
+}
+
+// Move Constructor
+IndexBuffer::IndexBuffer(IndexBuffer&& other) noexcept
+    : m_RendererID(other.m_RendererID), m_Count(other.m_Count) {
+    other.m_RendererID = 0; // Invalidate the moved-from object
+    other.m_Count = 0;
+    std::cout << "IndexBuffer moved (constructor)" << std::endl;
+}
+
+// Move Assignment Operator
+IndexBuffer& IndexBuffer::operator=(IndexBuffer&& other) noexcept {
+    if (this != &other) {
+        // Free existing resources
+        if (m_RendererID != 0) {
+            GLCall(glDeleteBuffers(1, &m_RendererID));
+        }
+
+        // Transfer ownership
+        m_RendererID = other.m_RendererID;
+        m_Count = other.m_Count;
+
+        // Invalidate the moved-from object
+        other.m_RendererID = 0;
+        other.m_Count = 0;
+
+        std::cout << "IndexBuffer moved (assignment)" << std::endl;
+    }
+    return *this;
+}
+
+void IndexBuffer::Bind() const  
+{
+  GLCall(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_RendererID)); //select buffer called 'buffer'
+}
+
+void IndexBuffer::Unbind() const
+{
+  GLCall(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)); //select buffer called 'buffer'
+}

src/IndexBuffer.h

@@ -0,0 +1,24 @@
+#pragma once
+
+class IndexBuffer 
+{
+public:
+  IndexBuffer(const unsigned int* data, unsigned int count);
+  ~IndexBuffer();
+
+  // Disallow copy operations
+  IndexBuffer(const IndexBuffer&) = delete;
+  IndexBuffer& operator=(const IndexBuffer&) = delete;
+
+  // Enable move operations
+  IndexBuffer(IndexBuffer&& other) noexcept;
+  IndexBuffer& operator=(IndexBuffer&& other) noexcept;
+
+  void Bind() const;
+  void Unbind() const;
+
+  inline unsigned int GetCount() const { return m_Count; }
+private:
+    unsigned int m_RendererID = 0;
+    unsigned int m_Count = 0;
+};

src/Renderer.cpp

@@ -0,0 +1,20 @@
+#include "Renderer.h"
+#include <iostream>
+
+
+
+void GLClearError() {
+  while (glGetError() != GL_NO_ERROR);
+    
+}
+
+bool GLLogCall() {
+  Color::Modifier red(Color::FG_RED);
+  Color::Modifier def(Color::FG_DEFAULT);
+  while (GLenum error = glGetError()) {
+    std::cout << red << "[OpenGL Error] (" << error << ")" << def << std::endl; //if error, it will return a number, this needs to be converted to hex to then look up that value inn GL docs
+    return false;
+  }
+  return true;
+}
+

src/Renderer.h

@@ -0,0 +1,37 @@
+#pragma once
+#include "colormod.h"
+#include <iostream>
+
+#include <GL/glew.h>
+
+
+#if defined(_MSC_VER)  // Microsoft Visual C++
+    #include <intrin.h>
+    #define DEBUG_BREAK() __debugbreak()
+#elif defined(__i386__) || defined(__x86_64__)
+    // Use inline assembly for x86/x86_64
+    #define DEBUG_BREAK() __asm__ volatile("int3")
+#else
+    // Fallback on non-x86 platforms
+    #include <signal.h>
+    #define DEBUG_BREAK() raise(SIGTRAP)
+#endif
+
+// ASSERT macro that shows file, line, and the failed expression
+#define ASSERT(x)                                                      \
+    do {                                                               \
+        if (!(x)) {                                                    \
+            std::cerr << "Assertion Failed: " << #x << '\n'           \
+                      << "File: " << __FILE__ << '\n'                  \
+                      << "Line: " << __LINE__ << std::endl;            \
+            DEBUG_BREAK();                                             \
+        }                                                              \
+    } while (false)
+
+#define GLCall(x) GLClearError();\
+  x;\
+  ASSERT(GLLogCall())
+
+#define INT2VOIDP(i) (void*)(uintptr_t)(i)
+void GLClearError();
+bool GLLogCall();

src/VertexArray.cpp

@@ -0,0 +1,41 @@
+#include "VertexArray.h"
+#include "Renderer.h"
+
+VertexArray::VertexArray()
+{
+  std::cout << "VertexArray::VertexArray()" << std::endl;
+  std::cout << "m_RendererID: " << &m_RendererID  << std::endl;
+  GLCall(glGenVertexArrays(1, &m_RendererID));
+  //glGenVertexArrays(1, &m_RendererID);
+  std::cout << "m_RendererID: " << &m_RendererID << std::endl;
+  if (!m_RendererID) {
+    std::cerr << "Failed to generate VAO" << std::endl;
+  }
+
+
+}
+VertexArray::~VertexArray()
+{
+  GLCall(glDeleteVertexArrays(1, &m_RendererID));
+}
+
+void VertexArray::AddBuffer(const VertexBuffer& vb, const VertexBufferLayout& layout)
+{
+  Bind();
+  vb.Bind();
+  const std::vector<VertexBufferElement> elements = layout.GetElements();
+  unsigned int offset = 0;
+  for (unsigned int i = 0; i < elements.size(); i++) {
+      const auto& element = elements[i];
+      GLCall(glEnableVertexAttribArray(i));
+      GLCall( glVertexAttribPointer(i, element.count, element.type, element.normalized,layout.GetStride(), INT2VOIDP(offset)) );
+      offset += element.count * VertexBufferElement::GetSizeOfType(element.type);
+    }
+}
+
+void VertexArray::Bind() const {
+  GLCall(glBindVertexArray(m_RendererID));
+}
+void VertexArray::Unbind() const {
+  GLCall(glBindVertexArray(0));
+}

src/VertexArray.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "VertexBuffer.h"
+#include "VertexBufferLayout.h"
+
+class VertexArray
+{
+  private:
+    unsigned int m_RendererID;
+    
+  public:
+    VertexArray();
+    ~VertexArray();
+    void AddBuffer(const VertexBuffer& vb, const VertexBufferLayout& layout);
+
+    void Bind() const;
+    void Unbind() const;
+};
+

src/VertexBuffer.cpp

@@ -0,0 +1,24 @@
+#include "VertexBuffer.h"
+#include "Renderer.h"
+
+VertexBuffer::VertexBuffer(const void* data, unsigned int size)
+{
+  GLCall(glGenBuffers(1, &m_RendererID));
+  GLCall(glBindBuffer(GL_ARRAY_BUFFER, m_RendererID)); //select buffer called 'buffer'
+  GLCall(glBufferData(GL_ARRAY_BUFFER, size, data, GL_STATIC_DRAW)); // assigne buffer size, static as we use many times, but does not change
+}
+
+VertexBuffer::~VertexBuffer()
+{
+  GLCall(glDeleteBuffers(1, &m_RendererID));
+}
+
+void VertexBuffer::Bind() const 
+{
+  GLCall(glBindBuffer(GL_ARRAY_BUFFER, m_RendererID)); //select buffer called 'buffer'
+}
+
+void VertexBuffer::Unbind() const
+{
+  GLCall(glBindBuffer(GL_ARRAY_BUFFER, 0)); //select buffer called 'buffer'
+}

src/VertexBuffer.h

@@ -0,0 +1,13 @@
+#pragma once
+
+class VertexBuffer 
+{
+private:
+    unsigned int m_RendererID;
+public:
+  VertexBuffer(const void* data, unsigned int size);
+  ~VertexBuffer();
+
+  void Bind() const;
+  void Unbind() const;
+};

src/VertexBufferLayout.h

@@ -0,0 +1,57 @@
+#ifndef VERTEXBUFFERLAYOUT_H
+#define VERTEXBUFFERLAYOUT_H
+#include <vector>
+#include <GL/glew.h>
+#include "Renderer.h"
+struct VertexBufferElement {
+    unsigned int type;
+    unsigned int count;
+    unsigned char normalized;
+
+    VertexBufferElement(unsigned int type, unsigned int count, unsigned char normalized)
+        : type(type), count(count), normalized(normalized) {}
+
+    static unsigned int GetSizeOfType(unsigned int type) {
+        switch (type) {
+            case GL_FLOAT: return sizeof(GLfloat);
+            case GL_UNSIGNED_INT: return sizeof(GLuint);
+            case GL_UNSIGNED_BYTE: return sizeof(GLubyte);
+        }
+        return 0;
+    }
+};
+
+class VertexBufferLayout {
+public:
+    VertexBufferLayout() : m_Stride(0) {}
+
+    template<typename T>
+    void Push(int count);
+
+    inline const std::vector<VertexBufferElement>& GetElements() const { return m_Elements; }
+    inline unsigned int GetStride() const { return m_Stride; }
+
+private:
+    std::vector<VertexBufferElement> m_Elements;
+    unsigned int m_Stride;
+};
+
+// Explicit specializations
+template<>
+inline void VertexBufferLayout::Push<float>(int count) {
+    m_Elements.push_back({ GL_FLOAT, static_cast<unsigned int>(count), GL_FALSE });
+    m_Stride += count * VertexBufferElement::GetSizeOfType(GL_FLOAT);
+}
+
+template<>
+inline void VertexBufferLayout::Push<unsigned int>(int count) {
+    m_Elements.push_back({ GL_UNSIGNED_INT,static_cast<unsigned int>(count), GL_FALSE });
+    m_Stride += count * VertexBufferElement::GetSizeOfType(GL_UNSIGNED_INT);
+}
+
+template<>
+inline void VertexBufferLayout::Push<unsigned char>(int count) {
+    m_Elements.push_back({ GL_UNSIGNED_BYTE, static_cast<unsigned int>(count), GL_TRUE });
+    m_Stride += count * VertexBufferElement::GetSizeOfType(GL_UNSIGNED_BYTE);
+}
+#endif // VERTEXBUFFERLAYOUT_H

src/colormod.h

@@ -1,3 +1,5 @@
+#ifndef COLORMOD_H
+#define COLORMOD_H
 #include <ostream>
 namespace Color {
     enum Code {
@@ -20,3 +22,4 @@ namespace Color {
         }
     };
 }
+#endif // COLORMOD_H

src/main.cpp

@@ -2,7 +2,9 @@
 
 int main(int argc, char* argv[]) {
     // Create an instance of our SdlWindow class
+    std::cout << "starting" << std::endl;
   SdlWindow window("My SDL2 Window", 800, 600);
+    std::cout << "About to run: " << std::endl;
 
   // Run the main loop
   window.run();

src/sdl.cpp

@@ -1,5 +1,6 @@
 #include <GL/glew.h> // Include GLEW before <SDL2/SDL.h>?
 #include "sdl.hpp"
+#include "VertexBufferLayout.h"
 #include "colormod.h" 
 #include <SDL2/SDL_video.h>
 #include <alloca.h>
@@ -12,6 +13,11 @@
 #include <string>
 #include <sstream>
 
+#include "Renderer.h"
+#include "VertexBuffer.h"
+#include "VertexArray.h"
+#include "IndexBuffer.h"
+
 #if defined(_MSC_VER)  // Microsoft Visual C++
     #include <intrin.h>
     #define DEBUG_BREAK() __debugbreak()
@@ -45,24 +51,31 @@ struct ShaderProgramSource {
 };
 
 SdlWindow::SdlWindow(const char* title, int width, int height)
-  : m_window(nullptr),
-    m_renderer(nullptr),
-    m_isRunning(false),
-    m_isFullscreen(false),
-    m_width(width),
-    m_height(height),
-    m_glContext(nullptr),
-    m_windowedWidth(width),
-    m_windowedHeight(height),
-    r(0.0f),
-    location(),
-    increment(0.05f)
+: m_window(nullptr),
+      m_renderer(nullptr),
+      m_isRunning(false),
+      m_isFullscreen(false),
+      m_width(width),
+      m_height(height),
+      m_windowedWidth(width),
+      m_windowedHeight(height),
+      r(0.5f),
+      m_glContext(nullptr),
+      increment(0.05f),
+      m_shader(0),
+      m_Location(-1),
+      m_IB(nullptr),
+      m_VB(nullptr),
+      m_VA(nullptr)
 {
+
+  std::cout << "Step 0: hellow world" << std::endl;
+
   // 1. Set attributes
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
-
+  std::cout << "Step 1: SDL_GL_SetAttribute completed" << std::endl;
   // 2. Create the window with OpenGL flag
     m_window = SDL_CreateWindow(title,
       SDL_WINDOWPOS_CENTERED,
@@ -72,27 +85,40 @@ SdlWindow::SdlWindow(const char* title, int width, int height)
       SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN| SDL_WINDOW_RESIZABLE);
 
   if (!m_window) {
-    std::cerr << "Failed to create window: " << SDL_GetError() << std::endl;
-    return;
+      std::cerr << "Failed to create window: " << SDL_GetError() << std::endl;
+      return;
   }
+  std::cout << "Step 2: SDL_CreateWindow completed" << std::endl;
 
-  // 3. Create OpenGL context
   m_glContext = SDL_GL_CreateContext(m_window);
   if (!m_glContext) {
       std::cerr << "Failed to create GL context: " << SDL_GetError() << std::endl;
       return;
   }
-  // 4. Optionally init GLEW (if not on macOS core profile)
+  std::cout << "Step 3: SDL_GL_CreateContext completed" << std::endl;
+
+  if (SDL_GL_MakeCurrent(m_window, m_glContext) != 0) {
+      std::cerr << "Failed to make GL context current: " << SDL_GetError() << std::endl;
+      return;
+  }
+  std::cout << "Step 4: SDL_GL_MakeCurrent completed" << std::endl;
+
   #ifndef __APPLE__
   glewExperimental = GL_TRUE;
   GLenum glewErr = glewInit();
-  if (glewInit() != GLEW_OK) {
-      std::cerr << "Failed to init GLEW" << glewGetErrorString(glewErr) << std::endl;
+  if (glewErr != GLEW_OK) {
+      std::cerr << "Failed to init GLEW: " << glewGetErrorString(glewErr) << std::endl;
       return;
   }
-  glGetError();
+  std::cout << "Step 5: GLEW initialized successfully" << std::endl;
+  glGetError(); // Clear GLEW's initial error
   #endif
 
+  std::cout << "OpenGL Version: " << glGetString(GL_VERSION) << std::endl;
+  std::cout << "GLSL Version: " << glGetString(GL_SHADING_LANGUAGE_VERSION) << std::endl;
+  std::cout << "Vendor: " << glGetString(GL_VENDOR) << std::endl;
+
+
   // 5. Set vsync (optional)
   SDL_GL_SetSwapInterval(1); //Vsync
 
@@ -111,31 +137,38 @@ SdlWindow::SdlWindow(const char* title, int width, int height)
       0, 1, 2,
       2, 3, 0
   };
-  //vertex buffer
-  unsigned int buffer;
-  GLCall(glGenBuffers(1, &buffer));
-  GLCall(glBindBuffer(GL_ARRAY_BUFFER, buffer)); //select buffer called 'buffer'
-  GLCall(glBufferData(GL_ARRAY_BUFFER, 6 * 2 * sizeof(float), positions, GL_STATIC_DRAW)); // assigne buffer size, static as we use many times, but does not change
-  //vertext attributes / layout
-  GLCall(glEnableVertexAttribArray(0));
-  GLCall(glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, 0));
-  //indext beffer
-  unsigned int ibo; //indext buffer object
-  GLCall(glGenBuffers(1, &ibo));
-  GLCall(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo)); //select buffer called 'buffer'
-  GLCall(glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6 * sizeof(unsigned int), indices, GL_STATIC_DRAW)); // assigne buffer size, static as we use many times, but does not change
+  m_VA = new VertexArray();
+  m_VB = new VertexBuffer(positions, 4 * 2 * sizeof(float));
+  m_IB = new IndexBuffer(indices, 6);
+
+  VertexBufferLayout layout;
+  layout.Push<float>(2);
+
+  m_VA->AddBuffer(*m_VB, layout);
   
   ShaderProgramSource source = parseShader("res/shaders/Basic.shader");
-  unsigned int shader = createShader(source.VertexSource, source.FragmentSource);
-  GLCall(glUseProgram(shader));
 
-  GLCall(int location = glGetUniformLocation(shader, "u_Color"));
-  ASSERT(location != -1); // -1 is an error
-  GLCall(glUniform4f(location, 0.8f, 0.3f, 0.8f, 1.0f));
+  std::cout << "VERTEX" << std::endl << source.VertexSource << std::endl;
+  std::cout << "FRAGMENT" << std::endl << source.FragmentSource << std::endl;
+
+  unsigned int shader = createShader(source.VertexSource, source.FragmentSource);
+  m_shader = shader;
+  std::cout << "shader: " << m_shader << std::endl;
+  std::cout << "shader: " << m_shader << std::endl;
+  GLCall(glUseProgram(m_shader));
+  
+  GLCall(m_Location = glGetUniformLocation(m_shader, "u_Color"));
+  ASSERT(m_Location != -1); // -1 is an error
+
+  GLCall(glUniform4f(m_Location, 0.8f, 0.3f, 0.8f, 1.0f));
+
+  GLCall(glBindVertexArray(0));
+  GLCall(glUseProgram(0));
+  GLCall(glBindBuffer(GL_ARRAY_BUFFER, 0));
+  GLCall(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));
 
 
 }
-
 SdlWindow::~SdlWindow() {
   // If using SDL Renderer, destroy it. But if you’re purely using OpenGL, you might remove it.
   if (m_renderer) {
@@ -153,20 +186,24 @@ SdlWindow::~SdlWindow() {
       SDL_DestroyWindow(m_window);
       m_window = nullptr;
   }
+  if (m_shader) {
+        glDeleteProgram(m_shader);
+        m_shader = 0;
+    }
 
   SDL_Quit();
 }
-
-
+//
+//
 void SdlWindow::run() {
   while (m_isRunning) {
     processEvents(); 
     update();
     render();
   }
-  GLCall(glDeleteProgram(shader));
+  GLCall(glDeleteProgram(m_shader));
 }
-
+//
 void SdlWindow::processEvents() {
 SDL_Event event;
   while (SDL_PollEvent(&event)) {
@@ -212,7 +249,7 @@ SDL_Event event;
     }
   }
 }
-
+//
 void SdlWindow::update() {
   // Update game/application logic here
   if (r > 1.0f) {
@@ -222,21 +259,29 @@ void SdlWindow::update() {
   }
   r += increment;
 }
-
+//
 void SdlWindow::render() {
   // Use GL calls instead of SDL’s renderer
   GLCall(glClearColor(0.0f, 0.0f, 0.0f, 1.0f)); //background
+  //
   GLCall(glClear(GL_COLOR_BUFFER_BIT));
   
+  GLCall(glUseProgram(m_shader));
+  std::cout << "m_shader: " << m_shader << std::endl;
+  std::cout << "location: " << m_Location << std::endl;
+  std::cout << "R: " << r << std::endl;
+  GLCall(glUniform4f(m_Location, r, 0.3f, 0.8f, 1.0f));
+
+  m_VA->Bind();
+  m_IB->Bind();
   // TODO: Draw with OpenGL here (shaders, triangles, etc.)
-  GLCall(glUniform4f( location, r, 0.3f, 0.8f, 1.0f));
   //glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
   GLCall(glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr)); //macro assert for debugging
   
   // Swap buffers
   SDL_GL_SwapWindow(m_window);
 }
-
+//
 void SdlWindow::setFullscreen(bool fullscreen) {
     if (m_window) {
         m_isFullscreen = fullscreen;
@@ -259,7 +304,7 @@ void SdlWindow::setFullscreen(bool fullscreen) {
         }
     }
 }
-
+//
 unsigned int SdlWindow::compileShader(unsigned int type, const std::string& source) {
   GLCall(unsigned int id = glCreateShader(type));
   const char* src = source.c_str(); // <--- this string needs to exist when compiling/running

src/sdl.hpp

@@ -9,10 +9,10 @@
   #include <GL/glew.h>     // or <glad/glad.h> if using GLAD
 #endif
 
-//#include <iostream>
-#include <fstream>
 #include <string>
-#include <sstream>
+#include "IndexBuffer.h"
+#include "VertexBufferLayout.h"
+#include "VertexArray.h"
 
 // Forward declaration of classes and structs if needed
 // class SomethingElse;
@@ -54,14 +54,14 @@ private:
   int           m_windowedWidth;   // stored width before fullscreen
   int           m_windowedHeight;  // stored height before fullscreen
   float         r;
-  int           location;
   SDL_GLContext m_glContext;
   float         increment; 
-  // temp shader stuff
-  std::string vetexShader;
-  std::string fragmentShader;
-  unsigned int shader;
-  
+//  // temp shader stuff
+  unsigned int  m_shader;
+  GLint   m_Location;
+  VertexArray* m_VA;
+  IndexBuffer* m_IB;
+  VertexBuffer* m_VB;
 
   // Private methods
   void processEvents();