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gamma correction
+10
-6
+10
-6
src/renderer.zig
+10
-6
src/renderer.zig
···
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if (world.hit(r, IntervalF32.init(0.001, std.math.inf(f32)))) |rec| {
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r.orig = rec.p;
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r.dir = util.randomOnHemisphere(rec.normal);
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return zm.f32x4(0.5, 0.5, 0.5, 1.0) * rayColor(r, world, depth - 1);
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r.dir = rec.normal + util.randomUnitVec();
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return zm.f32x4(0.1, 0.1, 0.1, 1.0) * rayColor(r, world, depth - 1);
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}
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const unit_direction = zm.normalize3(r.dir);
···
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const scale: f32 = 1.0 / @as(f32, @floatFromInt(samples_per_pixel));
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const intensity = IntervalF32.init(0.0, 0.999);
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const r_scaled = v[0] * scale;
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const g_scaled = v[1] * scale;
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const b_scaled = v[2] * scale;
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const a_scaled = v[3] * scale;
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const r_scaled = linearToGamma(v[0] * scale);
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const g_scaled = linearToGamma(v[1] * scale);
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const b_scaled = linearToGamma(v[2] * scale);
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const a_scaled = linearToGamma(v[3] * scale);
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const r: u8 = @intFromFloat(256 * intensity.clamp(r_scaled));
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const g: u8 = @intFromFloat(256 * intensity.clamp(g_scaled));
···
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return zigimg.color.Rgba32.initRgba(r, g, b, a);
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}
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inline fn linearToGamma(linear_component: f32) f32 {
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return @sqrt(linear_component);
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}