regression: cover extreme perspective rotations

regression/extreme-rotations/Arimo-Regular.ttf

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+../.fonts/Arimo-Regular.ttf

regression/extreme-rotations/desc

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+Near-edge-on rotations about the X and Y axes with off-center rotation
+origins. The samples include both rotation signs and geometry crossing
+the perspective plane.
+
+At 1920x1080, the first four samples exhibit outline-edge shifts of about
+4.43 pixels from the unquantized projection due to transform quantization
+and dequantization, causing the triangles visible in the output bitmaps
+to appear longer, with wider bases. These large deviations can likely
+also cause our output to appear visibly different from VSFilter's.
+
+extreme-rotations.ass samples:
+  1000: Positive Y rotation
+  3000: Negative Y rotation
+  5000: Negative X rotation
+  7000: Positive X rotation
+
+The perspective-clamp.ass pair translates both position and rotation origin
+0.125 pixels right between samples. The quantized linear and perspective
+coefficients stay unchanged. The unclamped tip moves 0.125 pixels right,
+while the two clamped corners move 100 pixels left. This exercises the
+amplification and reversal of fractional placement by the depth clamp,
+producing a 100.125-pixel translation error at 1920x1080. This is *massively*
+different from VSFilter's behavior.
+
+perspective-clamp.ass samples:
+  1000: Initial position
+  3000: Position and rotation origin translated 0.125 pixels right

regression/extreme-rotations/extreme-rotations.ass

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+[Script Info]
+ScriptType: v4.00+
+PlayResX: 1920
+PlayResY: 1080
+ScaledBorderAndShadow: yes
+WrapStyle: 2
+
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+Style: Default,Arimo,60,&H00005CFF,&H00005CFF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,0,0,5,0,0,0,1
+
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+Dialogue: 0,0:00:00.00,0:00:02.00,Default,positive-y,0,0,0,,{\1c&H005CFF&\an5\pos(2753.4375,541)\org(1012.1875,540)\fry89.524444641264\p1}m -1023 -1 l 1023 -1 1023 1 -1023 1
+Dialogue: 0,0:00:02.00,0:00:04.00,Default,negative-y,0,0,0,,{\1c&HFFB800&\an5\pos(1212.5625,541)\org(907.8125,540)\fry-89.524444641264\p1}m -1023 -1 l 1023 -1 1023 1 -1023 1
+Dialogue: 0,0:00:04.00,0:00:06.00,Default,negative-x,0,0,0,,{\1c&HB82EFF&\an5\pos(961,2333.4375)\org(960,592.1875)\frx-89.524444641264\p1}m -1 -1023 l 1 -1023 1 1023 -1 1023
+Dialogue: 0,0:00:06.00,0:00:08.00,Default,positive-x,0,0,0,,{\1c&H00D637&\an5\pos(961,792.5625)\org(960,487.8125)\frx89.524444641264\p1}m -1 -1023 l 1 -1023 1 1023 -1 1023

regression/extreme-rotations/perspective-clamp.ass

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+[Script Info]
+ScriptType: v4.00+
+PlayResX: 1920
+PlayResY: 1080
+ScaledBorderAndShadow: yes
+WrapStyle: 2
+
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+Style: Default,Arimo,60,&H00005CFF,&H00005CFF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,0,0,5,0,0,0,1
+
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+Dialogue: 0,0:00:00.00,0:00:02.00,Default,clamp-translation-start,0,0,0,,{\1c&HA0D400&\an5\pos(1903.0625,540.25)\org(1022.0625,540)\fry89.98698747997814\p1}m -1023 -0.25 l 1023 -0.25 1023 0.25 -1023 0.25
+Dialogue: 0,0:00:02.00,0:00:04.00,Default,clamp-translation-eighth-pixel,0,0,0,,{\1c&H303BFF&\an5\pos(1903.1875,540.25)\org(1022.1875,540)\fry89.98698747997814\p1}m -1023 -0.25 l 1023 -0.25 1023 0.25 -1023 0.25