From ac6c1e206407c615619a46532a86636593f51e23 Mon Sep 17 00:00:00 2001
From: Rokas Puzonas <rokas.puz@gmail.com>
Date: Sat, 2 Sep 2023 17:47:59 +0300
Subject: [PATCH] ditch WASM support for now

---
 README.md    |  2 ++
 build.zig    | 38 +++++++++++++++++++++++---------------
 src/main.zig | 13 +++++++++----
 3 files changed, 34 insertions(+), 19 deletions(-)

diff --git a/README.md b/README.md
index 5cd0a92..d3b363d 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,5 @@
 Techinal reference: http://devernay.free.fr/hacks/chip8/C8TECH10.HTM
 ROM archive: https://johnearnest.github.io/chip8Archive/
 Awesome chip8: https://chip-8.github.io/
+
+// TODO: WASM support
diff --git a/build.zig b/build.zig
index 4bf5ac1..50fadb9 100644
--- a/build.zig
+++ b/build.zig
@@ -6,22 +6,30 @@ pub fn build(b: *std.Build) !void {
     const optimize = b.standardOptimizeOption(.{});
     var raylib = rl.getModule(b, "raylib-zig");
     var raylib_math = rl.math.getModule(b, "raylib-zig");
+
+    // TODO: Figure out how to build project for WASM. Tried to do it but standard memory allocators
+    // didn't work.
+
     //web exports are completely separate
-    if (target.getOsTag() == .emscripten) {
-        const exe_lib = rl.compileForEmscripten(b, "chip8-zig", "src/main.zig", target, optimize);
-        exe_lib.addModule("raylib", raylib);
-        exe_lib.addModule("raylib-math", raylib_math);
-        const raylib_artifact = rl.getArtifact(b, target, optimize);
-        // Note that raylib itself is not actually added to the exe_lib output file, so it also needs to be linked with emscripten.
-        exe_lib.linkLibrary(raylib_artifact);
-        const link_step = try rl.linkWithEmscripten(b, &[_]*std.Build.Step.Compile{ exe_lib, raylib_artifact });
-        b.getInstallStep().dependOn(&link_step.step);
-        const run_step = try rl.emscriptenRunStep(b);
-        run_step.step.dependOn(&link_step.step);
-        const run_option = b.step("run", "Run chip8-zig");
-        run_option.dependOn(&run_step.step);
-        return;
-    }
+    // if (target.getOsTag() == .emscripten) {
+    //     const exe_lib = rl.compileForEmscripten(b, "chip8-zig", "src/main.zig", target, optimize);
+    //     exe_lib.addModule("raylib", raylib);
+    //     exe_lib.addModule("raylib-math", raylib_math);
+    //
+    //     const raylib_artifact = rl.getArtifact(b, target, optimize);
+    //     // Note that raylib itself is not actually added to the exe_lib output file, so it also needs to be linked with emscripten.
+    //     exe_lib.linkLibrary(raylib_artifact);
+    //
+    //     const link_step = try rl.linkWithEmscripten(b, &[_]*std.Build.Step.Compile{ exe_lib, raylib_artifact });
+    //     b.getInstallStep().dependOn(&link_step.step);
+    //
+    //     const run_step = try rl.emscriptenRunStep(b);
+    //     run_step.step.dependOn(&link_step.step);
+    //
+    //     const run_option = b.step("run", "Run chip8-zig");
+    //     run_option.dependOn(&run_step.step);
+    //     return;
+    // }
 
     const exe = b.addExecutable(.{ .name = "chip8-zig", .root_source_file = .{ .path = "src/main.zig" }, .optimize = optimize, .target = target });
 
diff --git a/src/main.zig b/src/main.zig
index e62d524..29dfa10 100755
--- a/src/main.zig
+++ b/src/main.zig
@@ -19,9 +19,13 @@ pub fn gen_sin_wave(wave: *rl.Wave, frequency: f32) void {
     }
 }
 
+fn megabytes(amount: usize) usize {
+    return amount * 1024 * 1024;
+}
+
 pub fn main() anyerror!void {
-    var buffer: [8192]u8 = undefined;
-    var fba = std.heap.FixedBufferAllocator.init(&buffer);
+    var program_memory = try std.heap.page_allocator.alloc(u8, megabytes(1));
+    var fba = std.heap.FixedBufferAllocator.init(program_memory);
     const allocator = fba.allocator();
 
     var chip = try ChipContext.init(&allocator);
@@ -48,13 +52,14 @@ pub fn main() anyerror!void {
     rl.setTargetFPS(60);
 
     const sample_rate = 44100;
-    var data = [1]i16{0} ** sample_rate;
+    var data = try allocator.alloc(i16, sample_rate);
+    defer allocator.free(data);
     var chip_wave = rl.Wave{
         .frameCount = sample_rate,
         .sampleRate = sample_rate,
         .sampleSize = 16,
         .channels = 1,
-        .data = @ptrCast(&data),
+        .data = @ptrCast(data.ptr),
     };
     gen_sin_wave(&chip_wave, 440);
     var chip_sound = rl.loadSoundFromWave(chip_wave);