From fd56a839d33d8d33ff4722550f97465db56b379d Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Fri, 20 Apr 2018 22:05:11 +0200
Subject: Replace GLFW3 with SDL2

Replace all of GLFW3 with SDL2 for future benefits.
---
 Makefile |  2 +-
 faqe.c   | 80 +++++++++++++++++++++++++++++++++++++++++-----------------------
 2 files changed, 52 insertions(+), 30 deletions(-)

diff --git a/Makefile b/Makefile
index 839b032..fccbf40 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ EPRINTF_PATH ?= ../eprintf
 PKG_CONFIG ?= pkg-config
 LN ?= ln -sf
 
-LIBS := glfw3
+LIBS := sdl2
 CPPFLAGS += -D__gl_h_
 CFLAGS += $(shell $(PKG_CONFIG) --cflags $(LIBS)) -std=c11 -MMD -MP
 LDFLAGS += -Wl,--as-needed
diff --git a/faqe.c b/faqe.c
index 0a9ab7d..ddcff69 100644
--- a/faqe.c
+++ b/faqe.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
  * SPDX-License-Identifier: MIT
  */
-#include <GLFW/glfw3.h>
+#include <SDL.h>
 #include <stdbool.h>
 
 #include "assets.h"
@@ -17,21 +17,11 @@ enum {
 	HEIGHT = 600,
 };
 
-void fb_size_cb(GLFWwindow *win, int width, int height)
-{
-	(void)win;
-	gl_viewport(0, 0, width, height);
-}
-
-void take_input(GLFWwindow *win)
-{
-	if (glfwGetKey(win, GLFW_KEY_ESCAPE) == GLFW_PRESS)
-		glfwSetWindowShouldClose(win, true);
-}
-
 int main(int argc, char **argv)
 {
-	GLFWwindow *win;
+	bool running = true;
+	SDL_Window *win;
+	SDL_GLContext *glc;
 	GLuint ebo, vbo, vao, prog;
 	GLint ucolor;
 	struct vertex {
@@ -51,20 +41,28 @@ int main(int argc, char **argv)
 
 	setprogname(argc >= 1 && argv[0] != NULL ? argv[0] : "faqe");
 
-	glfwInit();
+	if (SDL_Init(SDL_INIT_VIDEO) != 0)
+		eprintf("Failed to initialise SDL: %s", SDL_GetError());
 
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
-	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	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);
 
-	win = glfwCreateWindow(WIDTH, HEIGHT, "faqe", NULL, NULL);
+	win = SDL_CreateWindow("faqe",
+			       SDL_WINDOWPOS_UNDEFINED,
+			       SDL_WINDOWPOS_UNDEFINED,
+			       WIDTH, HEIGHT,
+			       SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
 	if (win == NULL)
-		eprintf("Failed to create GLFW window");
-	glfwMakeContextCurrent(win);
+		eprintf("Failed to create window: %s", SDL_GetError());
+
+	glc = SDL_GL_CreateContext(win);
+	if (glc == NULL)
+		eprintf("Failed to create OpenGL context: %s", SDL_GetError());
 
-	gl_load((gl_loadfunc *)glfwGetProcAddress);
-	glfwSetFramebufferSizeCallback(win, &fb_size_cb);
-	fb_size_cb(win, WIDTH, HEIGHT);
+	gl_load((gl_loadfunc *)SDL_GL_GetProcAddress);
+
+	gl_viewport(0, 0, WIDTH, HEIGHT);
 
 	gl_buf_gen(1, &vbo);
 	gl_buf_gen(1, &ebo);
@@ -93,8 +91,30 @@ int main(int argc, char **argv)
 
 	gl_poly_mode(GL_FRONT_AND_BACK, GL_LINE);
 
-	while (!glfwWindowShouldClose(win)) {
-		take_input(win);
+	while (running) {
+		SDL_Event ev;
+
+		while (SDL_PollEvent(&ev)) {
+			switch (ev.type) {
+			case SDL_KEYDOWN:
+			case SDL_KEYUP:
+				if (ev.key.state != SDL_RELEASED
+				    || ev.key.keysym.sym != SDLK_ESCAPE)
+					break;
+				/* fallthrough */
+			case SDL_QUIT:
+				running = false;
+				break;
+			case SDL_WINDOWEVENT:
+				switch (ev.window.event) {
+				case SDL_WINDOWEVENT_SIZE_CHANGED:
+					gl_viewport(0, 0,
+						    ev.window.data1,
+						    ev.window.data2);
+				}
+				break;
+			}
+		}
 
 		gl_clearcolor(0.2, 0.3, 0.3, 1.0);
 		gl_clear(GL_COLOR_BUFFER_BIT);
@@ -103,9 +123,11 @@ int main(int argc, char **argv)
 		gl_draw_elems(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
 		gl_va_bind(0);
 
-		glfwSwapBuffers(win);
-		glfwPollEvents();
+		SDL_GL_SwapWindow(win);
 	}
 
-	glfwTerminate();
+	SDL_GL_DeleteContext(glc);
+	SDL_DestroyWindow(win);
+
+	SDL_Quit();
 }
-- 
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