Added f16 capability

src/GpuDevice.zig

@@ -36,21 +36,32 @@ pub fn init(config: GpuDeviceConfig) !@This() {
     const adapter = ctx.adapter orelse return error.NoAdapter;
     errdefer c.wgpuAdapterRelease(adapter);
 
-    // --- QUERY HARDWARE LIMITS ---
+    var supported_features = std.mem.zeroes(c.WGPUSupportedFeatures);
+    c.wgpuAdapterGetFeatures(adapter, &supported_features);
+
     var supported_limits = std.mem.zeroes(c.WGPULimits);
     supported_limits.nextInChain = null;
-
-    // Fetch what your physical graphic card can actually handle
     if (c.wgpuAdapterGetLimits(adapter, &supported_limits) != 1) return error.FailedToGetAdapterLimits;
 
+    var has_f16 = false;
+    for (0..supported_features.featureCount) |i| {
+        if (supported_features.features[i] == c.WGPUFeatureName_ShaderF16) {
+            has_f16 = true;
+            break;
+        }
+    }
+
+    var feature_buf = [_]c.WGPUFeatureName{c.WGPUFeatureName_ShaderF16};
+    const required_features: []const c.WGPUFeatureName =
+        if (has_f16) feature_buf[0..1] else &.{};
+
     const device_descriptor = c.WGPUDeviceDescriptor{
         .nextInChain = null,
         .label = sv("TensorCompilerDevice"),
-        .requiredFeatureCount = 0,
-        .requiredFeatures = null,
+        .requiredFeatureCount = required_features.len,
+        .requiredFeatures = if (required_features.len > 0) required_features.ptr else null,
         .requiredLimits = &supported_limits,
     };
-
     _ = c.wgpuAdapterRequestDevice(
         adapter,
         &device_descriptor,

src/Vec.zig

@@ -15,7 +15,7 @@ pub fn initZero(gloc: *GpuAllocator, len: usize) !Vec {
     return .{
         .buf = try GpuBuffer.init(
             gloc,
-            f32,
+            f16,
             len,
             c.WGPUBufferUsage_Storage | c.WGPUBufferUsage_CopyDst | c.WGPUBufferUsage_CopySrc,
         ),
@@ -23,7 +23,7 @@ pub fn initZero(gloc: *GpuAllocator, len: usize) !Vec {
     };
 }
 
-pub fn initLoad(gloc: *GpuAllocator, data: []const f32) !Vec {
+pub fn initLoad(gloc: *GpuAllocator, data: []const f16) !Vec {
     var self = try initZero(gloc, data.len);
     try self.load(gloc.device, data);
     return self;
@@ -37,15 +37,15 @@ pub fn deinit(self: Vec) void {
 pub fn load(
     self: Vec,
     device: GpuDevice,
-    data: []const f32,
+    data: []const f16,
 ) !void {
     std.debug.assert(data.len == self.len);
-    const bytes = data.len * @sizeOf(f32);
+    const bytes = self.byteSize();
     c.wgpuQueueWriteBuffer(device.queue, self.buf.raw, 0, data.ptr, bytes);
 }
 
 pub fn byteSize(self: Vec) u64 {
-    return @as(u64, self.len) * @sizeOf(f32);
+    return @as(u64, self.len) * @sizeOf(f16);
 }
 
 pub fn run(self: Vec, gloc: *GpuAllocator, other: Vec, pip: GpuPipeline) !Vec {
@@ -60,13 +60,13 @@ pub fn run(self: Vec, gloc: *GpuAllocator, other: Vec, pip: GpuPipeline) !Vec {
 }
 
 /// GPU to CPU.
-pub fn read(self: Vec, gloc: *GpuAllocator, alloc: std.mem.Allocator) ![]f32 {
-    const out = try alloc.alloc(f32, self.len);
+pub fn read(self: Vec, gloc: *GpuAllocator, alloc: std.mem.Allocator) ![]f16 {
+    const out = try alloc.alloc(f16, self.len);
     const bytes = self.byteSize();
 
     const staging = try GpuBuffer.init(
         gloc,
-        f32,
+        f16,
         self.len,
         c.WGPUBufferUsage_MapRead | c.WGPUBufferUsage_CopyDst,
     );
@@ -88,7 +88,7 @@ pub fn read(self: Vec, gloc: *GpuAllocator, alloc: std.mem.Allocator) ![]f32 {
     );
     while (!mapped) gloc.device.poll();
 
-    const ptr: [*]const f32 = @ptrCast(@alignCast(
+    const ptr: [*]const f16 = @ptrCast(@alignCast(
         staging.getConstMappedRange(0, bytes),
     ));
     @memcpy(out[0..self.len], ptr[0..self.len]);
@@ -122,7 +122,7 @@ fn dispatch2in1out(
     while (offset < bytes) {
         // Calculate bounds for the current chunk
         const current_chunk_bytes = @min(max_chunk_bytes, bytes - offset);
-        const current_chunk_elements: u32 = @intCast(current_chunk_bytes / @sizeOf(f32));
+        const current_chunk_elements: u32 = @intCast(current_chunk_bytes / @sizeOf(f16));
 
         // Create uniform buffer for this specific chunk's size
         const info_buf = try GpuBuffer.init(

src/bench.zig

@@ -20,8 +20,8 @@ pub fn main(init: std.process.Init) !void {
 
     // --- WARM-UP PHASE ---
     {
-        var warmup_a = [_]f32{1.0};
-        var warmup_b = [_]f32{1.0};
+        var warmup_a = [_]f16{1.0};
+        var warmup_b = [_]f16{1.0};
         const wa = try Vec.initLoad(&gloc, &warmup_a);
         defer wa.deinit();
         const wb = try Vec.initLoad(&gloc, &warmup_b);
@@ -56,9 +56,9 @@ pub fn main(init: std.process.Init) !void {
 
     for (sizes) |size| {
         // --- Phase 1: Host Init/Alloc (Outside the iteration loop for pure host prep) ---
-        const data_a = try allocator.alloc(f32, size);
+        const data_a = try allocator.alloc(f16, size);
         defer allocator.free(data_a);
-        const data_b = try allocator.alloc(f32, size);
+        const data_b = try allocator.alloc(f16, size);
         defer allocator.free(data_b);
 
         for (0..size) |i| {
@@ -117,7 +117,7 @@ pub fn main(init: std.process.Init) !void {
 
         // --- Metrics Calculations ---
         const f_size = @as(f64, @floatFromInt(size));
-        const element_bytes = f_size * @as(f64, @floatFromInt(@sizeOf(f32)));
+        const element_bytes = f_size * @as(f64, @floatFromInt(@sizeOf(f16)));
         const mb = element_bytes / (1024.0 * 1024.0);
 
         // Individual Phase Timings (ms)

src/example.zig

@@ -18,9 +18,9 @@ pub fn main(init: std.process.Init) !void {
     const add_pip = try GpuPipeline.init(device, @embedFile("shaders/add.wgsl"));
     defer add_pip.deinit();
 
-    const data_a = try allocator.alloc(f32, 1024);
+    const data_a = try allocator.alloc(f16, 1024);
     defer allocator.free(data_a);
-    const data_b = try allocator.alloc(f32, 1024);
+    const data_b = try allocator.alloc(f16, 1024);
     defer allocator.free(data_b);
 
     for (0..1024) |i| {

src/shaders/add.wgsl

@@ -1,6 +1,8 @@
-@group(0) @binding(0) var<storage, read> A: array<f32>;
-@group(0) @binding(1) var<storage, read> B: array<f32>;
-@group(0) @binding(2) var<storage, read_write> C: array<f32>;
+enable f16;
+
+@group(0) @binding(0) var<storage, read> A: array<f16>;
+@group(0) @binding(1) var<storage, read> B: array<f16>;
+@group(0) @binding(2) var<storage, read_write> C: array<f16>;
 
 struct TensorInfo {
     size: u32,