altagos.dev
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small optimisation
+5
-3
src/tracer.zig
+5
-3
src/tracer.zig
···
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}
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pub fn trace(ctx: Context) void {
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const spp = zm.f32x4s(@as(f32, @floatFromInt(ctx.cam.samples_per_pixel)));
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+
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var height_iter = ctx.height.iter();
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while (height_iter.nextInc()) |j| {
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if (j >= ctx.cam.image_height) break;
···
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col += rayColor(&ray, ctx.world, ctx.cam.max_depth);
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}
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-
ctx.cam.setPixel(i, j, vecToRgba(col, ctx.cam.samples_per_pixel)) catch break;
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ctx.cam.setPixel(i, j, vecToRgba(col, spp)) catch break;
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}
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}
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}
···
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const nearly_one = zm.f32x4s(0.999);
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const v256 = zm.f32x4s(256);
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-
inline fn vecToRgba(v: zm.Vec, samples_per_pixel: usize) zigimg.color.Rgba32 {
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var rgba = zm.sqrt(v / zm.f32x4s(@as(f32, @floatFromInt(samples_per_pixel)))); // linear to gamma
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inline fn vecToRgba(v: zm.Vec, samples_per_pixel: zm.Vec) zigimg.color.Rgba32 {
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var rgba = zm.sqrt(v / samples_per_pixel); // linear to gamma
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rgba = zm.clampFast(rgba, zero, nearly_one);
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rgba = rgba * v256;
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