From b7b7cbb105dea088b4a265ef62df391d719e2cf2 Mon Sep 17 00:00:00 2001
From: Alejandro Laguna <alejandro.laguna@proton.me>
Date: Tue, 14 Jul 2026 15:03:35 +0200
Subject: [PATCH] feat: SDL3 display

---
 Makefile   |  3 +-
 src/main.c | 87 ++++++++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 74 insertions(+), 16 deletions(-)

diff --git a/Makefile b/Makefile
index 87e43f09ffb4e8a21d115a9dc7b160737c3e761e..a119c661f60133a0890e019397d52cea7a63f24c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 CC = gcc
 CFLAGS = -Wall -Wextra -Werror -g3 -I include/
+LIBFLAGS = -lm -lSDL3
  
 SRC = src/main.c src/color.c src/math.c
 OBJ = $(SRC:.c=.o)
@@ -11,7 +12,7 @@ bear:
 	bear -- make fclean all
 
 $(OUT): $(OBJ)
-	$(CC) -o $(OUT) $(OBJ) -lm
+	$(CC) -o $(OUT) $(OBJ) $(LIBFLAGS)
 
 clean:
 	rm -f $(OBJ)
diff --git a/src/main.c b/src/main.c
index 63bf5666e01d1d4ae62fdd37a895726a371bb612..607d64029437c77b4c7b75a0841e723e808eb149 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,27 +1,84 @@
+#include "SDL3/SDL.h"
 #include "mandelbrot.h"
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_init.h>
+#include <SDL3/SDL_oldnames.h>
+#include <SDL3/SDL_rect.h>
+#include <SDL3/SDL_render.h>
+#include <SDL3/SDL_surface.h>
+#include <SDL3/SDL_video.h>
 #include <stdio.h>
+#include <stdlib.h>
 
-int main() {
-    int width = 800;
-    int height = 600;
-    int max_iter = 100;
+// TODO: GPU shadering option
+// TODO: flexible window size
+// TODO: zooming in and out
+// TODO: maybe? change colors
+
+#define WINDOW_TITLE "Mandelbrot Visualization"
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+static int points[WINDOW_WIDTH * WINDOW_HEIGHT];
 
+void calculate_points() {
     double x_min = -2.0, x_max = 1.0;
     double y_min = -1.2, y_max = 1.2;
+    int max_iter = 100;
+    for (int py = 0; py < WINDOW_HEIGHT; py++) {
+        for (int px = 0; px < WINDOW_WIDTH; px++) {
+            double cr = x_min + (x_max - x_min) * px / (WINDOW_WIDTH - 1);
+            double ci = y_min + (y_max - y_min) * py / (WINDOW_HEIGHT - 1);
+            points[py * WINDOW_WIDTH + px] = mandelbrot_iterations(cr, ci, max_iter);
+        }
+    }
+}
 
-    // PPM header (P3 = ASCII, width, height, max color value)
-    printf("P3\n%d %d\n255\n", width, height);
-
-    for (int py = 0; py < height; py++) {
-        for (int px = 0; px < width; px++) {
-            double cr = x_min + (x_max - x_min) * px / (width - 1);
-            double ci = y_min + (y_max - y_min) * py / (height - 1);
-            int iter = mandelbrot_iterations(cr, ci, max_iter);
+void draw_points(SDL_Surface* surface) {
+    for (int py = 0; py < WINDOW_HEIGHT; py++) {
+        for (int px = 0; px < WINDOW_WIDTH; px++) {
             int r, g, b;
-            get_color(iter, max_iter, &r, &g, &b);
-            printf("%d %d %d ", r, g, b);
+            get_color(points[py * WINDOW_WIDTH + px], 100, &r, &g, &b);
+            SDL_WriteSurfacePixel(surface, px, py, r, g, b, 255);
         }
-        printf("\n");
     }
+};
+
+int main(void) {
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS)) {
+        fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
+        return -1;
+    }
+
+    SDL_Window* window =
+        SDL_CreateWindow(WINDOW_TITLE, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_HIDDEN);
+    if (window == NULL) {
+        fprintf(stderr, "CreateWindowAndRenderer failed: %s\n", SDL_GetError());
+        SDL_Quit();
+        return -1;
+    }
+
+    SDL_Surface* surface = SDL_GetWindowSurface(window);
+    if (!surface) {
+        return -1;
+    }
+    SDL_Event e;
+    bool running = true;
+    SDL_UpdateWindowSurface(window);
+    SDL_ShowWindow(window);
+    while (running) {
+        while (SDL_PollEvent(&e)) {
+            if (e.type == SDL_EVENT_QUIT) {
+                running = false;
+            }
+        }
+        calculate_points();
+        draw_points(surface);
+        SDL_UpdateWindowSurface(window);
+        SDL_Delay(16);
+    }
+
+    SDL_DestroyWindow(window);
+    SDL_Quit();
     return 0;
 }