From 7c48d434f0a68ac47ebe1bd66daa2c86842979c7 Mon Sep 17 00:00:00 2001
From: Charles <sircharlesaze@gmail.com>
Date: Tue, 27 Aug 2019 17:24:45 +0200
Subject: SDL boilerplate window

init, quit and run functions.
Error handling.
---
 Makefile   |  2 +-
 graphics.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 header.h   | 25 ++++++++++++++++++--
 main.c     |  9 ++++++-
 4 files changed, 112 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 232508f..03be06e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 NAME = mandel
 CC = gcc
 CCFLAGS = -Wall -Wextra
-LDFLAGS = -lm # $(shell sdl2-config --libs --cflags)
+LDFLAGS = -lm $(shell sdl2-config --libs --cflags)
 
 HEADER = header.h
 SRC = main.c graphics.c mandelbrot.c
diff --git a/graphics.c b/graphics.c
index e69de29..e9e12ff 100644
--- a/graphics.c
+++ b/graphics.c
@@ -0,0 +1,80 @@
+#include "header.h"
+
+#define WINDOW_TITLE "Mandelbrot"
+#define WINDOW_X 20
+#define WINDOW_Y 20
+
+static void event_handler(GState *state);
+static void destroy_state(GState *state);
+static void error_exit_state(GState *state, const char *msg);
+static void error_exit(const char *msg);
+
+GState *graphics_init(GConf *conf)
+{
+    GState *state = (GState*)malloc(sizeof(GState));
+    if (state == NULL)
+        return NULL;
+    if (SDL_Init(SDL_INIT_VIDEO) < 0)
+        error_exit("unable to init SDL");
+    state->window = SDL_CreateWindow(WINDOW_TITLE, WINDOW_X, WINDOW_Y,
+                                     conf->window_width, conf->window_height, 0);
+    if (state->window == NULL)
+        error_exit("unable to create window");
+    state->renderer = SDL_CreateRenderer(state->window, -1, 0);
+    if (state->renderer == NULL)
+        error_exit_state(state, "unable to create renderer");
+    state->running = true;
+    return state;
+}
+
+void graphics_quit(GState *state)
+{
+    destroy_state(state);
+    SDL_Quit();
+}
+
+void graphics_run(GState *state)
+{
+    while (state->running)
+    {
+        event_handler(state);
+
+        SDL_Delay(10);
+    }
+}
+
+static void event_handler(GState *state)
+{
+    SDL_Event e;
+    while (SDL_PollEvent(&e))
+    {
+        switch (e.type)
+        {
+            case SDL_QUIT:
+                state->running = false;
+                break;
+        }
+    }
+}
+
+static void destroy_state(GState *state)
+{
+    if (state == NULL)
+        return;
+    SDL_DestroyRenderer(state->renderer);
+    SDL_DestroyWindow(state->window);
+    free(state);
+}
+
+static void error_exit_state(GState *state, const char *msg)
+{
+    destroy_state(state);
+    error_exit(msg);
+}
+
+static void error_exit(const char *msg)
+{
+    SDL_Log("ERROR: %s: %s", SDL_GetError(), msg);
+    SDL_Quit();
+    exit(EXIT_FAILURE);
+}
diff --git a/header.h b/header.h
index e46ce7e..855cff3 100644
--- a/header.h
+++ b/header.h
@@ -1,9 +1,30 @@
 #ifndef HEADER_H
 # define HEADER_H
 
-#include <complex.h>
+# include <stdbool.h>
+# include <complex.h>
+# include <SDL2/SDL.h>
 
-double mandelbrot_in_set(double complex c);
+typedef struct
+{
+    SDL_Window *window;
+    SDL_Renderer *renderer;
+    bool running;
+} GState;
+
+typedef struct
+{
+    int window_width;
+    int window_height;
+} GConf;
+
+// mandelbrot.c
+double mandelbrot_in_set(double _Complex c);
 void mandelbrot_print(void);
 
+// graphics.c
+GState *graphics_init(GConf *conf);
+void graphics_quit(GState *state);
+void graphics_run(GState *state);
+
 #endif
diff --git a/main.c b/main.c
index f1fb7af..494ee2c 100644
--- a/main.c
+++ b/main.c
@@ -2,6 +2,13 @@
 
 int main(void)
 {
-    mandelbrot_print();
+    /* mandelbrot_print(); */
+    GConf gconf = {
+        .window_width = 300,
+        .window_height = 300
+    };
+    GState *gstate = graphics_init(&gconf);
+    graphics_run(gstate);
+    graphics_quit(gstate);
     return 0;
 }
-- 
cgit