gol: Use the windowing system

apps/CMakeLists.txt

@@ -38,6 +38,7 @@ luna_app(sysfuzz.cpp sysfuzz)
 luna_app(cp.cpp cp)
 luna_app(kill.cpp kill)
 luna_app(gol.cpp gol)
+target_link_libraries(gol PUBLIC ui)
 luna_app(touch.cpp touch)
 luna_app(free.cpp free)
 luna_app(about.cpp about)

apps/gol.cpp

@@ -1,13 +1,12 @@
-#include <alloca.h>
 #include <assert.h>
 #include <fcntl.h>
 #include <luna/Heap.h>
 #include <os/ArgumentParser.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/ioctl.h>
-#include <sys/mman.h>
 #include <time.h>
+#include <ui/App.h>
+#include <ui/Window.h>
 #include <unistd.h>
 
 struct Cell
@@ -16,16 +15,12 @@ struct Cell
     bool new_state;
 };
 
-static int g_num_rows = 76;
-static int g_num_columns = 102;
-
-static int g_fb_width;
-static int g_fb_height;
-
-static int g_fd;
+static int g_num_rows = 40;
+static int g_num_columns = 60;
 
 static Cell* g_cells;
-static char* g_fb;
+
+static ui::Window* g_window;
 
 static Result<void> fill_cells()
 {
@@ -47,31 +42,30 @@ static Cell& find_cell(int row, int column)
     return g_cells[row * g_num_columns + column];
 }
 
-static constexpr int BYTES_PER_PIXEL = 4;
+static constexpr int BYTES_PER_PIXEL = sizeof(u32);
+static constexpr ui::Color activated_cell_color = ui::CYAN;
+static constexpr ui::Color deactivated_cell_color = ui::Color::from_rgb(40, 40, 40);
 
 static void draw_cells()
 {
-    const int CELL_WIDTH = g_fb_width / g_num_columns;
-    const int CELL_HEIGHT = g_fb_height / g_num_rows;
+    const int CELL_WIDTH = g_window->canvas().width / g_num_columns;
+    const int CELL_HEIGHT = g_window->canvas().height / g_num_rows;
+
+    auto canvas = g_window->canvas();
 
     for (int i = 0; i < g_num_rows; i++)
     {
-
         for (int j = 0; j < g_num_columns; j++)
         {
-            char* buf = g_fb + (i * g_fb_width * CELL_HEIGHT * BYTES_PER_PIXEL);
+            auto subcanvas = canvas.subcanvas(ui::Rect { j * CELL_WIDTH, i * CELL_HEIGHT, CELL_WIDTH, CELL_HEIGHT });
 
             auto& cell = find_cell(i, j);
-            u8 color = cell.state ? 0xff : 0x00;
-            for (int k = 0; k < CELL_HEIGHT; k++)
-            {
-                memset(buf + (j * CELL_WIDTH * BYTES_PER_PIXEL), color, CELL_WIDTH * BYTES_PER_PIXEL);
-                buf += g_fb_width * BYTES_PER_PIXEL;
-            }
+            ui::Color color = cell.state ? activated_cell_color : deactivated_cell_color;
+            subcanvas.fill(color);
         }
     }
 
-    msync(g_fb, g_fb_height * g_fb_width * BYTES_PER_PIXEL, MS_SYNC);
+    g_window->update();
 }
 
 static int find_neighbors(int row, int column)
@@ -109,71 +103,30 @@ static void next_generation()
 
 Result<int> luna_main(int argc, char** argv)
 {
-    u64 delay_between_iterations = 250;
-    u64 delay_at_end = 3000;
-    u64 num_iterations = 100;
+    ui::App app;
+    TRY(app.init(argc, argv));
+    app.set_nonblocking();
 
-    StringView columns;
-    StringView rows;
-    StringView delay;
-    StringView end_delay;
-    StringView iterations;
-    StringView seed;
-
-    os::ArgumentParser parser;
-    parser.add_description("A framebuffer-based implementation for Conway's Game of Life.");
-    parser.add_system_program_info("gol"_sv);
-    parser.add_positional_argument(rows, "rows"_sv, "76"_sv);
-    parser.add_positional_argument(columns, "columns"_sv, "102"_sv);
-    parser.add_value_argument(delay, 'd', "delay"_sv, "the delay between generations (in ms)");
-    parser.add_value_argument(end_delay, 'e', "end-delay"_sv,
-                              "after finishing, how much to wait before returning to the shell (in ms)");
-    parser.add_value_argument(iterations, 'i', "iterations"_sv, "how many generations to show (default: 100)");
-    parser.add_value_argument(seed, 's', "seed"_sv, "the seed for the random number generator");
-    parser.parse(argc, argv);
-
-    g_num_columns = (int)TRY(columns.to_uint());
-    g_num_rows = (int)TRY(rows.to_uint());
-    if (!delay.is_empty()) delay_between_iterations = TRY(delay.to_uint());
-    if (!end_delay.is_empty()) delay_at_end = TRY(end_delay.to_uint());
-    if (!iterations.is_empty()) num_iterations = TRY(iterations.to_uint());
-    if (!seed.is_empty()) srand((unsigned)TRY(seed.to_uint()));
-    else
-        srand((unsigned)time(NULL));
-
-    g_fd = open("/dev/fb0", O_RDWR);
-    if (g_fd < 0)
-    {
-        perror("gol: cannot open framebuffer for writing");
-        return 1;
-    }
-
-    g_fb_height = ioctl(g_fd, FB_GET_HEIGHT);
-    g_fb_width = ioctl(g_fd, FB_GET_WIDTH);
+    g_window = TRY(ui::Window::create(ui::Rect { 200, 200, 600, 400 }));
+    g_window->set_title("Game of Life");
+    app.set_main_window(g_window);
 
     TRY(fill_cells());
 
-    g_fb =
-        (char*)mmap(nullptr, g_fb_height * g_fb_width * BYTES_PER_PIXEL, PROT_READ | PROT_WRITE, MAP_SHARED, g_fd, 0);
-    if (g_fb == MAP_FAILED)
+    int counter = 0;
+
+    while (app.process_events())
     {
-        perror("gol: cannot map framebuffer into memory");
-        return 1;
+        if (counter >= 10)
+        {
+            next_generation();
+            draw_cells();
+            counter = 0;
+        }
+        else
+            counter++;
+        usleep(10000);
     }
 
-    draw_cells();
-
-    while (num_iterations--)
-    {
-        usleep(delay_between_iterations * 1000);
-        next_generation();
-        draw_cells();
-    }
-
-    usleep(delay_at_end * 1000);
-
-    munmap(g_fb, g_fb_height * g_fb_width * BYTES_PER_PIXEL);
-    free(g_cells);
-
     return 0;
 }