From a1b4bcd5461b80e9b43cba7e6cf84c7d9d5eea9a Mon Sep 17 00:00:00 2001
From: Warwick <warwick.l.e.new@gmail.com>
Date: Thu, 21 Jan 2021 16:20:18 +0000
Subject: [PATCH] moved from sdl's renderer to a gl context. (still nothing on
 screen)

---
 Makefile     |  2 +-
 src/main.cpp | 87 +++++++++++++++++++++++++++++-----------------------
 2 files changed, 49 insertions(+), 40 deletions(-)

diff --git a/Makefile b/Makefile
index 7451c33..bdf91c5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # Set default options
 CC = clang++
 
-CFLAGS = -g -Wall -lSDL2 -lSDL2main
+CFLAGS = -g -Wall -lSDL2 -lSDL2main -lGLEW
 
 TARGET = Game
 SRCDIR = src/
diff --git a/src/main.cpp b/src/main.cpp
index 9da7d55..8b3f3e0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,59 +1,68 @@
 //#include <iostream>
+#include <GL/glew.h>
+#include <GL/gl.h>
 #include <SDL2/SDL.h>
+#include <SDL2/SDL_opengl.h>
 
 //TODO: Create Error handling class
 
 int main(int argc, char ** argv){
-  // Initialise SDL2
-  SDL_Init(SDL_INIT_EVERYTHING);
+    // Initialise SDL2
+    //TODO: Check if sdl initialised
+    SDL_Init(SDL_INIT_EVERYTHING);
 
-  // Create Window
-  SDL_Window *window =
-    SDL_CreateWindow("Game", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
-                     800, 600, SDL_WINDOW_SHOWN);
-  //TODO: Test that window was created successfully
+    //Make OpenGL use double buffering (Render game first then shove to output)
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 
-  // Create Renderer
-  SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
-  // TODO: Test that renderer was created successfully
+    //TODO: Understand what a depth buffer is
+    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
 
-  //Create event handling struct
-  SDL_Event input;
+    //TODO: Discover if thid is necessary for linux and what values they need be
+    //SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+    //SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+    //SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+    //SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
+    
+    // Create Window
+    SDL_Window *window =
+        SDL_CreateWindow("Game", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+                800, 600, SDL_WINDOW_SHOWN|SDL_WINDOW_OPENGL);
+    //TODO: Test that window was created successfully
 
-  //Temporary until GL context is added
-  // Set the draw color of renderer to green
-  SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
+    //Create glContext
+    SDL_GLContext glContext = SDL_GL_CreateContext(window);
+    //TODO: Test that glContext was created successfully
 
-  //update renderer with prior prefix
-  SDL_RenderPresent(renderer);
-
-  //wait used until close window hook implemented
-  //SDL_Delay(3000);
+    //Initialise Glew
+    if (glewInit() != GLEW_OK){
+        //TODO: Throw an error lol
+    }
 
 
-  // Game loop
-  bool running = true;
-  while(running){
-    //SDL Event handling loop
-    while (SDL_PollEvent(&input) > 0){
-      // Handle SDL quit event
-      if (input.type == SDL_QUIT){
-        running = false;
-      }
-      //TODO: Do something with keys lol
+    //Create event handling struct
+    SDL_Event input;
 
+    // Game loop
+    bool running = true;
+    while(running){
+        //SDL Event handling loop
+        while (SDL_PollEvent(&input) > 0){
+            // Handle SDL quit event
+            if (input.type == SDL_QUIT){
+                running = false;
+            }
+            //TODO: Do something with keys lol
+
+        };
     };
-  };
 
-  // Escaped Game loop
+    // Escaped Game loop
 
-  // On close destroy renderer
-  SDL_DestroyRenderer(renderer);
-  // On close also destroy window
-  SDL_DestroyWindow(window);
+    // On close also destroy window
+    SDL_DestroyWindow(window);
 
-  // Close all leftover SDL systems
-  SDL_Quit();
+    // Close all leftover SDL systems
+    SDL_Quit();
 
-  return 0;
+    return 0;
 }