From e9ca5a52e658e2ac1430db3d9f220eaa39fdb76a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=D0=9F=D1=8B=D1=82=D0=BA=D0=BE=D0=B2=20=D0=A0=D0=BE=D0=BC?= =?UTF-8?q?=D0=B0=D0=BD?= Date: Mon, 30 Mar 2026 19:34:54 +0300 Subject: [PATCH] =?UTF-8?q?SIMD=20=D0=B4=D0=BB=D1=8F=20=D0=BD=D0=B0=D0=BB?= =?UTF-8?q?=D0=BE=D0=B6=D0=B5=D0=BD=D0=B8=D1=8F=20=D0=B1=D1=83=D1=84=D1=84?= =?UTF-8?q?=D0=B5=D1=80=D0=BE=D0=B2?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- src/render/cpu/pipeline.zig | 57 ++++++++++++++++++++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/src/render/cpu/pipeline.zig b/src/render/cpu/pipeline.zig index 933163f..29e2a18 100644 --- a/src/render/cpu/pipeline.zig +++ b/src/render/cpu/pipeline.zig @@ -162,7 +162,62 @@ pub const DrawContext = struct { pub fn compositeDrawerContext(self: *DrawContext, other: *const DrawContext, opacity: f32) void { if (self.buf_width != other.buf_width or self.buf_height != other.buf_height) return; const n = self.buf_width * self.buf_height; - for (0..n) |i| { + const lanes = 4; + const VF = @Vector(lanes, f32); + const VU8 = @Vector(lanes, u8); + const zero_f: VF = @splat(0.0); + const max_f: VF = @splat(255.0); + const opacity_v: VF = @splat(opacity); + const inv_255_v: VF = @splat(1.0 / 255.0); + + var i: usize = 0; + while (i + lanes <= n) : (i += lanes) { + const src0 = other.pixels[i + 0]; + const src1 = other.pixels[i + 1]; + const src2 = other.pixels[i + 2]; + const src3 = other.pixels[i + 3]; + + const src_a_u8: VU8 = .{ src0.a, src1.a, src2.a, src3.a }; + const nonzero_mask = src_a_u8 != @as(VU8, @splat(0)); + if (!@reduce(.Or, nonzero_mask)) continue; + + const src_r_f: VF = @as(VF, @floatFromInt(@as(VU8, .{ src0.r, src1.r, src2.r, src3.r }))) * opacity_v; + const src_g_f: VF = @as(VF, @floatFromInt(@as(VU8, .{ src0.g, src1.g, src2.g, src3.g }))) * opacity_v; + const src_b_f: VF = @as(VF, @floatFromInt(@as(VU8, .{ src0.b, src1.b, src2.b, src3.b }))) * opacity_v; + const src_a_f: VF = @as(VF, @floatFromInt(src_a_u8)) * inv_255_v * opacity_v; + const inv_a_f: VF = @as(VF, @splat(1.0)) - src_a_f; + + const dst_r_u8: VU8 = .{ self.pixels[i + 0].r, self.pixels[i + 1].r, self.pixels[i + 2].r, self.pixels[i + 3].r }; + const dst_g_u8: VU8 = .{ self.pixels[i + 0].g, self.pixels[i + 1].g, self.pixels[i + 2].g, self.pixels[i + 3].g }; + const dst_b_u8: VU8 = .{ self.pixels[i + 0].b, self.pixels[i + 1].b, self.pixels[i + 2].b, self.pixels[i + 3].b }; + const dst_a_u8: VU8 = .{ self.pixels[i + 0].a, self.pixels[i + 1].a, self.pixels[i + 2].a, self.pixels[i + 3].a }; + + const dst_r_f: VF = @as(VF, @floatFromInt(dst_r_u8)); + const dst_g_f: VF = @as(VF, @floatFromInt(dst_g_u8)); + const dst_b_f: VF = @as(VF, @floatFromInt(dst_b_u8)); + const dst_a_f: VF = @as(VF, @floatFromInt(dst_a_u8)); + + const out_r_f = @min(@max(src_r_f + inv_a_f * dst_r_f, zero_f), max_f); + const out_g_f = @min(@max(src_g_f + inv_a_f * dst_g_f, zero_f), max_f); + const out_b_f = @min(@max(src_b_f + inv_a_f * dst_b_f, zero_f), max_f); + const out_a_f = @min(@max(src_a_f * @as(VF, @splat(255.0)) + inv_a_f * dst_a_f, zero_f), max_f); + + const out_r_u8: VU8 = @intFromFloat(out_r_f); + const out_g_u8: VU8 = @intFromFloat(out_g_f); + const out_b_u8: VU8 = @intFromFloat(out_b_f); + const out_a_u8: VU8 = @intFromFloat(out_a_f); + + for (0..lanes) |lane| { + if (!nonzero_mask[lane]) continue; + const dst = &self.pixels[i + lane]; + dst.r = out_r_u8[lane]; + dst.g = out_g_u8[lane]; + dst.b = out_b_u8[lane]; + dst.a = out_a_u8[lane]; + } + } + + while (i < n) : (i += 1) { const src = other.pixels[i]; if (src.a == 0) continue; const dst = &self.pixels[i];