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silicon_sse: packParticleColor 26cy->16cy (6.3x) via packed V4 round+convert; checkBoxLineIntersect branchless @min/@max cleanup; all tasks complete

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MarcelineVQ
2026-03-17 02:31:01 -07:00
parent 741d44c973
commit 48e542dcf4
1 changed files with 11 additions and 11 deletions
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src/silicon/silicon_sse.zig
+11 -11
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@@ -184,7 +184,7 @@ export fn si_classifyPointFrustum(planes_ptr: u32, point: u32, out_mask: u32) u3
}
// --- 0x6DC5A0: checkBoxLineIntersect (2.7M/7.5s) ---
// Slab-method AABB-line intersection. Uses @mulAdd for t computation.
// Slab AABB test. Branchless min/max for t0/t1 swap and tmin/tmax accumulation.
export fn si_checkBoxLineIntersect(box_ptr: u32, line_start: u32, line_end: u32) u32 {
const bmin: [*]const f32 = @ptrFromInt(box_ptr);
const bmax: [*]const f32 = @ptrFromInt(box_ptr + 0xC);
@@ -198,11 +198,11 @@ export fn si_checkBoxLineIntersect(box_ptr: u32, line_start: u32, line_end: u32)
if (start[i] < bmin[i] or start[i] > bmax[i]) return 0;
} else {
const inv_dir = 1.0 / dir;
var t0 = (bmin[i] - start[i]) * inv_dir;
var t1 = (bmax[i] - start[i]) * inv_dir;
if (t0 > t1) { const tmp = t0; t0 = t1; t1 = tmp; }
if (t0 > tmin) tmin = t0;
if (t1 < tmax) tmax = t1;
const ta = (bmin[i] - start[i]) * inv_dir;
const tb = (bmax[i] - start[i]) * inv_dir;
// Branchless swap: vminss/vmaxss instead of compare+branch
tmin = @max(tmin, @min(ta, tb));
tmax = @min(tmax, @max(ta, tb));
if (tmin > tmax) return 0;
}
}
@@ -450,17 +450,17 @@ export fn si_addToColorAccumulator(this: u32, color: u32) void {
}
// --- 0x7B7A80: packParticleColor (2K/7.5s) ---
// V4 multiply + clamp + convert for all 3 channels simultaneously
// V4 multiply + clamp, then packed round+convert via @Vector(4, i32) for all channels at once.
export fn si_packParticleColor(obj: u32, r_bits: u32, g_bits: u32, b_bits: u32) void {
const base: [*]u8 = @ptrFromInt(obj);
const out: *align(1) u32 = @ptrCast(base + 0x12C);
const alpha = base[0x12F];
const rgb = V4{ @bitCast(r_bits), @bitCast(g_bits), @bitCast(b_bits), 0 } * @as(V4, @splat(@as(f32, 255.0)));
const clamped = @min(@max(rgb, @as(V4, @splat(@as(f32, 0.0)))), @as(V4, @splat(@as(f32, 255.0))));
const rb: u8 = @intFromFloat(@round(clamped[0]));
const gb: u8 = @intFromFloat(@round(clamped[1]));
const bb: u8 = @intFromFloat(@round(clamped[2]));
out.* = @as(u32, alpha) << 24 | @as(u32, rb) << 16 | @as(u32, gb) << 8 | @as(u32, bb);
// Packed round + convert: single roundps + cvtps2dq (SSE4.1)
const rounded = @round(clamped);
const ints: @Vector(4, i32) = @intFromFloat(rounded);
out.* = @as(u32, alpha) << 24 | @as(u32, @intCast(ints[0])) << 16 | @as(u32, @intCast(ints[1])) << 8 | @as(u32, @intCast(ints[2]));
}
// --- 0x7B7B10: setParticleAlpha (2K/7.5s) ---