From 79173c530d1846082c631dd4fe81c6429fffa5f0 Mon Sep 17 00:00:00 2001
From: Schark <jordan@schark.online>
Date: Wed, 10 May 2023 23:42:32 -0700
Subject: Transition to opengl and glfw

---
 .gitignore     |  1 +
 CMakeLists.txt |  6 +++---
 src/main.c     | 50 +++++++++++++++++++-------------------------------
 3 files changed, 23 insertions(+), 34 deletions(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a007fea
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/*
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e80f12..c7f1de8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,10 +3,10 @@ project(raycaster C)
 
 set(CMAKE_C_STANDARD 99)
 
-find_package(SDL2 REQUIRED)
-include_directories(${SDL2_INCLUDE_DIRS} include)
+find_package(OpenGL REQUIRED)
+find_package(glfw3 REQUIRED)
 
 file(GLOB SOURCES "src/*.c")
 
 add_executable(raycaster ${SOURCES})
-target_link_libraries(raycaster ${SDL2_LIBRARIES})
+target_link_libraries(raycaster ${OPENGL_gl_LIBRARY} glfw)
diff --git a/src/main.c b/src/main.c
index c225b14..cb652fd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,46 +1,34 @@
-#include <SDL.h>
+#include <GLFW/glfw3.h>
 #include <stdio.h>
 
 int main(int argc, char *argv[]) {
-	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
-		printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
-		return 1;
-	}
+	GLFWwindow* window;
 
-	SDL_Window *window = SDL_CreateWindow("Raycaster", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
-	if (!window) {
-		printf("Window could not be created! SDL_Error: %s\n", SDL_GetError());
-		return 1;
+	// initiate glfw library
+	if (!glfwInit()){
+		printf("Failed to initiate GLFW.\n");
+		return -1;
 	}
 
-	SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
-	if (!renderer) {
-		printf("Renderer could not be created. SDL_Error: %s\n", SDL_GetError());
-		SDL_DestroyWindow(window);
-		SDL_Quit();
-		return 1;
+	// create glfw window
+	window = glfwCreateWindow(800, 600, "raycaster", NULL, NULL);
+	if (!window){
+		printf("Failed to create GLFW window.\n");
+		glfwTerminate();
+		return -1;
 	}
 
-	int running = 1;
-	SDL_Event event;
-
-	while (running) {
-		while (SDL_PollEvent(&event)){
-			if (event.type == SDL_QUIT) {
-				running = 0;
-			}
-		}
+	// make window current
+	glfwMakeContextCurrent(window);
 
-		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
-		SDL_RenderClear(renderer);
+	while (!glfwWindowShouldClose(window)) {
 
-		SDL_RenderPresent(renderer);
+		glClear(GL_COLOR_BUFFER_BIT);
+		glfwSwapBuffers(window);
+		glfwPollEvents();
 
 	}
 
-	SDL_DestroyRenderer(renderer);
-	SDL_DestroyWindow(window);
-	SDL_Quit();
-
+	glfwTerminate();
 	return 0;
 }
-- 
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