From 09d6c779515c1f181ead150d16bf63a178cb43db Mon Sep 17 00:00:00 2001
From: kdx <kikoodx@paranoici.org>
Date: Wed, 31 May 2023 10:20:50 +0200
Subject: tfw it builds

---
 .gitignore   |  1 +
 build.zig    |  2 +-
 src/Px.zig   | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.zig | 40 +++++++++++++++++++++++----------------
 4 files changed, 87 insertions(+), 17 deletions(-)
 create mode 100644 src/Px.zig

diff --git a/.gitignore b/.gitignore
index fe95f8d..f594753 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /zig-*
+/.build_config
diff --git a/build.zig b/build.zig
index 569c77c..fe1ffa6 100644
--- a/build.zig
+++ b/build.zig
@@ -28,7 +28,7 @@ pub fn build(b: *std.Build) void {
     });
     sdk.link(exe, .dynamic);
 
-    exe.addModule("sdl2", sdk.getNativeModule());
+    exe.addModule("sdl2", sdk.getWrapperModule());
 
     // This declares intent for the executable to be installed into the
     // standard location when the user invokes the "install" step (the default
diff --git a/src/Px.zig b/src/Px.zig
new file mode 100644
index 0000000..690dae9
--- /dev/null
+++ b/src/Px.zig
@@ -0,0 +1,61 @@
+const std = @import("std");
+const sdl = @import("sdl2");
+const Allocator = std.mem.Allocator;
+
+const Self = @This();
+pub const Color = u8;
+
+allocator: Allocator,
+renderer: sdl.Renderer,
+width: u32,
+height: u32,
+buffer: []Color,
+texture: sdl.Texture,
+
+pub fn init(allocator: Allocator, renderer: sdl.Renderer, width: u32, height: u32) !Self {
+    var self = Self{
+        .allocator = allocator,
+        .renderer = renderer,
+        .buffer = undefined,
+        .width = width,
+        .height = height,
+        .texture = undefined,
+    };
+
+    self.buffer = try allocator.alloc(Color, width * height);
+    errdefer allocator.free(self.buffer);
+
+    self.texture = try sdl.createTexture(
+        renderer,
+        sdl.PixelFormatEnum.rgba8888,
+        sdl.Texture.Access.streaming,
+        width,
+        height,
+    );
+    errdefer self.texture.destroy();
+
+    return self;
+}
+
+pub fn deinit(self: *Self) void {
+    self.texture.destroy();
+    self.allocator.free(self.buffer);
+}
+
+pub fn flip(self: *Self) void {
+    _ = self;
+    return;
+    //var pixeldata = try self.texture.lock(null);
+    //_ = pixeldata;
+
+    //var y: usize = 0;
+    //while (y < self.height) : (y += 1) {
+    //    var x: usize = 0;
+    //    while (x < self.width) : (x += 1) {
+    //    }
+    //}
+}
+
+pub fn cls(self: *Self, c: Color) void {
+    @memset(self.buffer, c);
+}
diff --git a/src/main.zig b/src/main.zig
index c8a3f67..88d56d3 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,24 +1,32 @@
 const std = @import("std");
+const sdl = @import("sdl2");
+const Px = @import("Px.zig");
 
 pub fn main() !void {
-    // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
-    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
 
-    // stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    const stdout_file = std.io.getStdOut().writer();
-    var bw = std.io.bufferedWriter(stdout_file);
-    const stdout = bw.writer();
+    try sdl.init(.{
+        .video = true,
+        .events = true,
+    });
+    defer sdl.quit();
 
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
+    var window = try sdl.createWindow(
+        "zig-px",
+        .{ .centered = {} },
+        .{ .centered = {} },
+        640,
+        480,
+        .{ .vis = .shown },
+    );
+    defer window.destroy();
 
-    try bw.flush(); // don't forget to flush!
-}
+    var renderer = try sdl.createRenderer(window, null, .{ .accelerated = true });
+    defer renderer.destroy();
+
+    var px = try Px.init(arena.allocator(), renderer, 256, 256);
+    defer px.deinit();
 
-test "simple test" {
-    var list = std.ArrayList(i32).init(std.testing.allocator);
-    defer list.deinit(); // try commenting this out and see if zig detects the memory leak!
-    try list.append(42);
-    try std.testing.expectEqual(@as(i32, 42), list.pop());
+    px.cls(0);
 }
-- 
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