From b4e2c43852020ef679ca6a0011c67ea84db89d8a Mon Sep 17 00:00:00 2001
From: Austin Morlan <mail@austinmorlan.com>
Date: Fri, 28 Oct 2022 13:58:52 -0700
Subject: [PATCH] Update README

---
 CMakeLists.txt      |  7 +++++--
 README.md           |  2 +-
 Source/Platform.cpp | 27 ++++++++++++++++++++++-----
 Source/Platform.hpp | 11 ++++++-----
 4 files changed, 34 insertions(+), 13 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7815fb2..d237f65 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,9 @@ project(chip8)
 
 set(CMAKE_CXX_STANDARD 11)
 
-find_package(SDL2 REQUIRED)
+add_subdirectory(3rdParty/glad EXCLUDE_FROM_ALL)
+add_subdirectory(3rdParty/sdl-2.0.20 EXCLUDE_FROM_ALL)
+add_subdirectory(3rdParty/imgui-1.88 EXCLUDE_FROM_ALL)
 
 add_executable(
 	chip8
@@ -13,4 +15,5 @@ add_executable(
 
 target_compile_options(chip8 PRIVATE -Wall)
 
-target_link_libraries(chip8 PRIVATE SDL2::SDL2)
+target_link_libraries(chip8 PRIVATE glad SDL2 imgui)
+
diff --git a/README.md b/README.md
index 86df1d1..bc2a325 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# CHIP-8 Emulator
+# CHIP-8 Emulator (2019)
 
 A simple emulator for the CHIP-8.
 
diff --git a/Source/Platform.cpp b/Source/Platform.cpp
index b4199d5..cbd96b7 100644
--- a/Source/Platform.cpp
+++ b/Source/Platform.cpp
@@ -1,17 +1,34 @@
 #include "Platform.hpp"
-#include <SDL2/SDL.h>
+#include <glad/gl.h>
+#include <SDL.h>
 
 
 Platform::Platform(char const* title, int windowWidth, int windowHeight, int textureWidth, int textureHeight)
 {
 	SDL_Init(SDL_INIT_VIDEO);
 
-	window = SDL_CreateWindow(title, 0, 0, windowWidth, windowHeight, SDL_WINDOW_SHOWN);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
 
-	renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+	window = SDL_CreateWindow(
+		title,
+		SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+		windowWidth, windowHeight,
+		SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
 
-	texture = SDL_CreateTexture(
-		renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, textureWidth, textureHeight);
+	gl_context = SDL_GL_CreateContext(window);
+	SDL_GL_SetSwapInterval(1);
+	gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
+
+	glGenTextures(1, &framebuffer_texture);
+	glBindTexture(GL_TEXTURE_2D, framebuffer_texture);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 640, 320, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	glBindTexture(GL_TEXTURE_2D, 0);
 }
 
 Platform::~Platform()
diff --git a/Source/Platform.hpp b/Source/Platform.hpp
index bcf7e30..819c126 100644
--- a/Source/Platform.hpp
+++ b/Source/Platform.hpp
@@ -1,15 +1,14 @@
 #pragma once
 
 #include <cstdint>
-
-
-class SDL_Window;
-class SDL_Renderer;
-class SDL_Texture;
+#include <SDL.h>
+#include <glad/gl.h>
 
 
 class Platform
 {
+	friend class Imgui;
+
 public:
 	Platform(char const* title, int windowWidth, int windowHeight, int textureWidth, int textureHeight);
 	~Platform();
@@ -18,6 +17,8 @@ public:
 
 private:
 	SDL_Window* window{};
+	SDL_GLContext gl_context{};
+	GLuint framebuffer_texture;
 	SDL_Renderer* renderer{};
 	SDL_Texture* texture{};
 };