From 20748a8e608315e4b1b58e1b736714b577e4d6e0 Mon Sep 17 00:00:00 2001
From: Brett <brettmaster1@gmail.com>
Date: Tue, 28 Nov 2023 01:56:10 -0500
Subject: [PATCH] window

---
 include/blt/gfx/window.h | 47 +++++++++++++++++++++++++
 src/blt/gfx/window.cpp   | 74 +++++++++++++++++++++++++++++++++++++++-
 src/main.cpp             | 15 +++++++-
 3 files changed, 134 insertions(+), 2 deletions(-)

diff --git a/include/blt/gfx/window.h b/include/blt/gfx/window.h
index 643f91b..9b2be84 100644
--- a/include/blt/gfx/window.h
+++ b/include/blt/gfx/window.h
@@ -10,6 +10,53 @@
 
 #include <glad/gl.h>
 #include <GLFW/glfw3.h>
+#include <functional>
+#include <cstdint>
+#include <string>
+#include <utility>
 
+namespace blt::gfx
+{
+    struct window_context
+    {
+        std::int32_t GL_MAJOR = 4;
+        std::int32_t GL_MINOR = 6;
+        std::int32_t DOUBLE_BUFFER = GLFW_TRUE;
+        std::int32_t GL_PROFILE = GLFW_OPENGL_CORE_PROFILE;
+    };
+    
+    struct window_data
+    {
+        std::string title;
+        std::int32_t width;
+        std::int32_t height;
+        std::function<void()> init;
+        std::function<void(std::int32_t, std::int32_t)> update;
+        
+        window_context context{};
+        std::int32_t sync_interval = 0;
+        
+        window_data(std::string title, std::function<void()> init, std::function<void(std::int32_t, std::int32_t)> update, std::int32_t width = 640,
+                    std::int32_t height = 480):
+                title(std::move(title)), width(width), height(height), init(std::move(init)), update(std::move(update))
+        {}
+        
+        window_data& setContext(const window_context& ctx)
+        {
+            context = ctx;
+            return *this;
+        }
+        
+        window_data& setSyncInterval(std::int32_t sync)
+        {
+            sync_interval = sync;
+            return *this;
+        }
+    };
+    
+    void init(const window_data& data);
+    
+    void cleanup();
+}
 
 #endif //BLT_WITH_GRAPHICS_TEMPLATE_WINDOW_H
diff --git a/src/blt/gfx/window.cpp b/src/blt/gfx/window.cpp
index 6e6cde9..f67ce87 100644
--- a/src/blt/gfx/window.cpp
+++ b/src/blt/gfx/window.cpp
@@ -3,4 +3,76 @@
  * Licensed under GNU General Public License V3.0
  * See LICENSE file for license detail
  */
-#include <blt/gfx/window.h>
\ No newline at end of file
+#include <blt/gfx/window.h>
+#include <blt/std/assert.h>
+#include <blt/std/logging.h>
+
+void error_callback(int error, const char* description)
+{
+    BLT_ERROR("GLFW Error (%d): %s", error, description);
+    std::abort();
+}
+
+namespace blt::gfx
+{
+    // because we aren't meant to have multiple GLFW windows (especially with GLAD) we will keep the window as global state.1
+    struct
+    {
+        GLFWwindow* window;
+        std::int32_t width;
+        std::int32_t height;
+    } window_state;
+    
+    void create_callbacks()
+    {
+    
+    }
+    
+    void init(const window_data& data)
+    {
+        /* -- Setup Error Callback -- */
+        glfwSetErrorCallback(error_callback);
+        BLT_ASSERT(glfwInit() && "Unable to init GLFW. Aborting.");
+        
+        /* -- Setup Window Context -- */
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, data.context.GL_MAJOR);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, data.context.GL_MINOR);
+        glfwWindowHint(GLFW_DOUBLEBUFFER, data.context.DOUBLE_BUFFER);
+        glfwWindowHint(GLFW_OPENGL_PROFILE, data.context.GL_PROFILE);
+        
+        /* -- Create the Window -- */
+        window_state.window = glfwCreateWindow(data.width, data.height, data.title.c_str(), nullptr, nullptr);
+        BLT_ASSERT(window_state.window && "Unable to create GLFW window.");
+        
+        /* -- Set Window Specifics + OpenGL -- */
+        glfwMakeContextCurrent(window_state.window);
+        glfwSwapInterval(data.sync_interval);
+        gladLoadGL(glfwGetProcAddress);
+        
+        create_callbacks();
+        
+        /* -- Call User Provided post-window-init function  -- */
+        data.init();
+        
+        /* -- General Loop -- */
+        while (!glfwWindowShouldClose(window_state.window))
+        {
+            /* -- Get the current framebuffer size, update the global width/height state, along with OpenGL viewport -- */
+            glfwGetFramebufferSize(window_state.window, &window_state.width, &window_state.height);
+            glViewport(0, 0, window_state.width, window_state.height);
+            
+            /* -- Call user update function -- */
+            data.update(window_state.width, window_state.height);
+            
+            /* -- Update GLFW state -- */
+            glfwSwapBuffers(window_state.window);
+            glfwPollEvents();
+        }
+    }
+    
+    void cleanup()
+    {
+        glfwDestroyWindow(window_state.window);
+        glfwTerminate();
+    }
+}
diff --git a/src/main.cpp b/src/main.cpp
index 4f9de56..bc7c634 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,7 +1,20 @@
 #include <iostream>
 
+#include <blt/gfx/window.h>
+
+void init()
+{
+
+}
+
+void update(std::int32_t width, std::int32_t height)
+{
+
+}
+
 int main()
 {
-    std::cout << "Hello, World!" << std::endl;
+    blt::gfx::init(blt::gfx::window_data{"My Sexy Window", init, update}.setSyncInterval(1));
+    blt::gfx::cleanup();
     return 0;
 }