test_sdl2

Author: pmp-p

src/test_sdl2.py

@@ -0,0 +1,310 @@
+try:
+    __import__("os").chdir(__import__("tempfile").gettempdir())
+except:
+    __import__("os").chdir("/tmp")
+
+def fs_decode(fsname, o248):
+    import os
+    path = fsname.rsplit('/')
+    for i in range(len(path)):
+        try:
+            os.mkdir('/'.join( path[0:i] ))
+        except:
+            pass
+    with open(fsname, "wb") as fs:
+        for input in o248.split("\n"):
+            if not input:
+                continue
+            fs.write(bytes([ord(c) - 248 for c in input]))
+
+
+fs_decode('./blob.png','''
+ƁňņĿąĂĒĂøøøąŁŀļŊøøøƗøøøƗĀûøøøLjƽdzNJøøøđŬĽŐŬĻŧťťŝŦŬøĻŪŝřŬŝŜĘůšŬŠĘĿŁŅňŏŹĆďøøøāŨŀőūø
+øĦěøøĦěùŰƝķŮøøøŀňńŌĽĿŨńƆŕĹƾžƓƱŲŏýüüùùùǷƦǁûûûúúúúúúĘĎČıĠĠǥƚƳǐƋƢƗŠłŇĴĸţłļűœśƳŸƋƋš
+ůƠŮžDzDzDzƦƥƥǍǍǍŀœţģøøøĂŬŊņŋøǷǷǷƝǷǷǖśĚLJŽŰŧøøĆƵŁļĹŌŰǒǜŔƃŪǢİĊƕĀƄĹćǣđǰǷķǕǦƎŜǃƮĜńŨDžŦǍĢ
+ƯžżİǠưƗƟœǥDZǟƗǷƯǭŰĴǶįŹǕũŕƧǛƸĿŔǏǣǵǶħěĕDZƨőǴƖŶŭýŘøťǫǓǩǗļİŌĎǚĻƑƅĻųƅƫĔŁƢŏČǫƁĮƨƾěŘǩǬĥǴ
+ĿĴǦƠdžǍĝƾĒƛǟǃĊļưƦĈţĪŸǣƱĚċǎųǟĺǨĶĨƽƔƿƅƿĊƳāņġĝƝƺƽŐƨŴǠħĖĥûŽDzůŰƔūřùƒſƕǝąŎŲǩǃĮüƖƽƯƏýĸƑ
+ăŮĉĜƯŎƃþŞƈǟǵūŬƠĤŃƸĮųǗŦƂƏƊǫǢǎŒƹƒƤøǰĈơźĹƄŨǏijƄėƻīƖġűƋǍťōĮĻśûƋƯdžƊĤŰƕǩƽƗʼnĕƬĤĤŻǮǂƋƲķú
+ǠijƳIJǴĸťŻǢŚƃŰƔǫĎǔƁƫǥŧŨġƬŏĎDŽėøŢǎǖČDŽŇżƯǐŀNJĄƎƫƨƷǥǔżĿāƆėŽśøǐĬģĝDzǚĥŮĞŴĤƀőƹōŭǠƇĥƨăĈnjǃć
+ŁćǭŃúüýŪǏƲžǵùĖƑŘûƘüŭƑǓğǰĐľĻNjưĝğžƇDžćśğƲĸǍþđķƢǖƍźűǕŚěƴķžǠĢƸøƾƜŦėāLjƉøģǦǦĬǷƃǨŞŸŚćňź
+ƱżǓǙƍüĀŷƼǵĆŘǘŷčŖijDŽǰǜƃƪƎőŒĒƞĈƛįùŋDZħżƏùŦĝǀŊŨƙŵƉĉĔúǠĈĂƯņčŧÿǪǓǩģĎƻŏøŝǴňƫĐĶśǢĐĸúěǴƔą
+ǙŻǰŏƢĥŤňDžēıłōƙƼƿƒƦźǡƃŤøƧŭƖİśČƘƌƜǧŹŗŇǙƠľĝŃğįĔƤŔǤĖƏǤžĎĬùŬǚƐŜʼnƻǨěŹĕƦƟĨšƖúĭǜũƲšĉùĥĂ
+ǦƺƛēĘŸĶţŐĽľīƔǀǪùƋŚƁĠŝľƍǝěǗǚĻŒƕźǬøĴijŋǣīǃĈŘljŜLJŻũƃƼƜǢDZŧƁǧĎĭƄƗƘĽƞƜǏƋĂƝĩǫŰƪėĪİĢīǖżƎƭ
+ÿƙƃļŸūőĨŖŇŹůŕƂĜċƊƲLjƇƱžėƳøƁŴƚŻĜƬŦƦƒƬƟǧǦşƁćDZēƎŠāŖǀǓǐįűưǀĩĩńƿƂŁÿĿǦĴƖěĶŦƙƦǬřĆğƐĺŰƤŪ
+ǗøüƿōţŸŐƜþǴĠĄĩǛǵĔŴƖƱƺǎƉĶƃǟǧǣǭǤƨƲƐăŻďƔţĝǏþđķńƗźǧƒƕŚǁŞŀĽǤħƤƏƾƄLjĎŖƀƽĝǏơúĥĺĆƠùƻDžǭĜǩ
+ĥŹĤŎėDzƏĎǒřƫǦřļāĠƔƀĵĸňŻĶƹĻǦǛźħıĚŴƤŶǵǶĶƗħĊƘšŐƘĪŌŻƶŶƗŲǙdžīĸƑƢƮǩĬǭƢƔĠĬƁǧƝƹüŷĻƳƂƺǕǭċƝ
+ǴĬƐŭǞƈĶŷČijƹĻĎǭǂźĶûĶǨƅǨdzţƓŌŗĊřƆŞǨżŘšŝĉŪNJƯĐûƧŗÿƷƀŇťǩƉǴŬƫƦŭźƔǠýģŖŎƱąĊǘǏǰŊNJĠčÿǮǯĺdzƻ
+ƅƭŤƁćƥƸœdzƄŚƦǰƱǛǗĢƐnjǣǎǰǨŋƋǚĸĹƴŖšǂǠǜħŰĩƜǘƒƗśęĵǔLJĭƷǠƐźĄėŕƘřŶŢùǞǁŐţǯęǭđǰƺƎǝűǔąDŽĂįŧƀ
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+ēǍĦƽČįĶdžƸğƣnjƦǏǎƸǰǯǂǙƱċŽǰįĆĪƬǩƵģǂljƱĉǘǃĻǙĚǒʼnŠŰǴŏǨƽǞƂƩĖţĆljǪŪǩŝdzŝǮǗLJǩùĸIJŃƸźƶǍƣƎŘƑŗĝ
+ĈƤƅǤėǩùĸĤŁŽĆǥĆǀƯāżǠǍŗǩʼnĿƼǭǶǮǣüĪǟįŭdzǓǢǏǀŗdzÿLjǟśǰǶĠǗŧǵŻƆđǔƳĦƗŌĦİćƶĒĎƎŵŠƱƧāŘĆLjƕťơƀDŽ
+ąĈƲƕƻƾǘƷĞLjǏƔŸœĉŚıƙƔƳĘǒżśĀĝǶǡůǰǨǠǓƬǩġǤƟźƃēśĥĖǬűēųŨǮƈƻŷLJǷƠƶĬƦǝĘŌśţĀƷŪĶƁōƎüŒǟûčǯǝŗ
+ĮǑŪŹŌīĸNJƇǑĺÿŧĩĻƯƩŨƖųČĉňǎDžƳƾijĝīŲġűǓljýǣǃŧēĀƇƮÿŋƛƛǦǐnjǃǍƤƇħǨīIJŤūĂǖęƙīƭœĩĭƩƍƥǥǓƘėdžŠĈ
+ĵĎƆħǯĝƦńžƌŜƭøƽĉŽƶøŇǡćƍĔŹƥijdžǠŵĞŃĚƎşŘʼnūƻĊāŬǏƁŇǠŦŤŀǶƞƄœņDZŅŪċŗǰăĊŠƥDzƹŧĴƝùƵĀŨŽĈǁƓLJœƽ
+ǪDŽƌſřŐĞůƒƏşüƏĺŸƱĿƱĈŸĺĸĹļĻĬŝƳǀĮƂǖƽDZſƫĞƽƈƽǰƭüǩĠūŮʼnơŐƆĐŃƙƞųƿǤƟĬğŏĩľħĥŪIJŧʼnnjǙǞřśŋƞǚǖ
+ĭǥǪƫƤŧNjƿǂƆńŵŰżƨņĤƃſśʼnŦǓơśİǁűǃĮƬƓćÿŌǤěœƔĚƣďşƎůþŠĚƴīǟģĉǘŘǑŮőŚŏdzĔĿƼƞǁĈĀǖƁǒŵǨƉǛǴǡŚź
+ǫƂƟdžĸǤŝƒǯƂƿǝŰƢLjǜÿƼădžŻįŊĉţƈűǢĽƻDZĭĈěǝǒŲƇƿūňƀżŰİǖżďŕǯĜŰǩƨĎńLJljżŻĀƣěĢDzdžǓĬūǀƱĈŒǣǬďŅþŅ
+ƿnjƟĕǥăǣơǀņǟǗǒǦŭǤŸǖƏûƉŔēǏƢųŝƔƝƻƑdžŋþćƄĢƆǭĤħćǛŔơǢǘƵĭŘŭĘķţƓýƔŌƢƐƓǵǪŴƒŻǤƂĉĬúŀĿŻřħĺIJİ
+ƽƛŋǴŏNjƤƄſǍĬǬĪĪǞăŹǫĬÿūŷLjǏũŰǒƦÿĭĈĻƔƹƠùŜƄōĞŮƊœƿŰđƇLJƧĪƭŘŋďdzǟƿƀŚŘƎǏǟăþĉſǠNjƚżŎĄIJưƤŋŻƉ
+ƻưƥźǏǰƠƔƃƸƮƩƠǠƠƿǩģĵŕŘŅŸǪĿǏÿijŞęƧǎƊijŝǡƪĦĆĢƍIJŮijƤłƝĩǥNJøŠĴŝŔƍǦǐǷǛƺĈƺǃƽňĥĥǰŲǦƁǖĬƏƁŖŷǚ
+ǒƔƳǀŭŀƞǰŞĤdzŠűǒŕƳŅƦũĚęƔńŌĮŘąƨǷŐƸŃįøǧúņŒŚĕŕƫýĞāƲǐƫƭĐČƑijŸąŜƦƛĐǔĶčƾǡŋĈēŸƳŔǪǶǛŚŴĚƁǯĪ
+ùĸƲƼǨąǫƈœŗƝƮƾŘNjDŽżţĐśƬNJƈƞłƢǠŪƏśĮļŔƎǫƺıļŶijłĈƜǁůǁŁƩŅǖĀĩDŽĂřƕūœŀģƣŃƙüşşĒŅĨđĿƋłĔśčǗĝǝ
+ƞĵũƋdzƵĹšƌǏĘĖÿǟŢźƻŁĊĥŀƩƈĘƳƕĹƢĭƫĚŷüħŻăƯœŸdzƲƙĐŤŨƃƎƵĝƛſĤĻLJİüƼŁřĒŶŽNjǭġŖĀśǍƳʼnLjİNjžĢƖƸŷ
+įšǚƪŒƒŏŰƱŜĭĝIJďDŽǴĔŻǎǐŝĻƤĘĬĶŇŹđǧǕƉƞǢǤğŴǔļǟĭĶŜùƍŋŁƭĹƾłƄƅğijĘđċǡŚſƒƶĩƙǨŵǮĈǶƚŷƞšǮťŖǣƓ
+ŀǍāėƠŅśøņƼƁĤƃĀřİĴƛIJœƙƠNJČƆĩŪłǚƣƏąŊǥǍƳŹƁŋŒżǎýŎƲDŽǙƞıƕğǥǡųƪĘƄǕŖĬƣĦƱǂƻƅƸǤŢŧĔǧǡŃƻǯǴǘũ
+ŇƻſƘŝljģŒǍĉĸŵĶǫŦǙŔřǵƔƊĺĜƼNJņŇƚşżŅŨƂƖĊŒŷǭƳŒƴžƇċƳǙDžƆŠĩĊơŐǴIJźĦúńƇƕDžƣďĄùƘƠǚûþŞƼƦęňėƁń
+ĠćăũdzśƿśƌƥƐǘĕĊŧĜŎǔƶƫƏąǣǴŠljǨƜŃĻljǥDzŦƤĔƻǨƀŇưǶřǢƗƹýƂƇũİƮķİťDZLjňŨƺƟĆIJŀǨƥǍŴƲĉNJĘƍŐĵŸƦǚƻ
+ĉėļķƺůĘƺưŌĤƭƗƧǔĥċǁıŪĿǥŲøģúƄǰŊƇƝƽNjnjĚİœŚċƞƪŶƒƃIJĝĵāĢljƼǏıńŅǨŸijƽÿĊǡűœŀƭķėħǢĖŭĜƀǟŞǛƟǰ
+NJūIJǩƙďƙDžijĈNjǴIJŅNjņźĴűƁŢDžǥǬǨĩǑŶƄƀŧƹŅDZƣƳǎǰƄĐƲĊüùǪLJǜƏǘĉǁǵŀƏĉǰDzĵʼnĴţƸŒǕǏǩċDZčNJģǕřăĞƷħžů
+ćŇƿþŞœƻDzĻŴljĭƼƞljƨāĘǵǨĺǵƹǬƂņƺƣƛũũĵĽąƗťǙŃǚĻŮƫĀǁŌŚĨŷėŕŞőǫŬǠŋƫĞŕƭķǀƶƲžħĿĎŴǞǛǟƬƝǓǖǐǨŗ
+ƖdzƯƪŒēđĶįŠņőŴǣƺƪǡĖīĶŏƹƏƄćƽşdžƽƏĿǟŝĈǰŨŞǞŽřƗŸƯǰƂǡǀƤŕŅĝĂžƲƗǡČŴŞǖƇŢŗƕĽDZŤǩŻŴĵŜĨŃĬƯŴźď
+ƁįĭƲƨƾƇŗǰƧƄƹdzƧǶƕDŽǰǠđŘƪĥĤþŬŽǙƏǰŴņƇƽūźǰĖįNjƝƭƞǚǗýĮƓǧƚżķğƒıņğýƿşƌŋŦŰŎǰšƁħƀǝǒĤĵżƟŷǒǨ
+ǎăǩōŧĘǗƺĬųŨĄĐāŗĄįƲōĘƽǨŏǔăŃŜƑĖƆĵĆƧƂŧŻĮǩżČĩĠŪǝǠƙţǟƺƀćąĤƋņʼnnjƭǬǤǫÿǨĆǘģĜƀŊĻſĭǀšŔėƗŨƆ
+ǔŸƏƿĨļőĘƨƔƂħùĬƼǮǁǘƉnjƘŴŢǍƿźħƂǂĦƖǧǛijŘǍưǡƈƯƖęČŧƼƍǖēĂƈǫħǎŏdžŤƗƿǤƧŁĤƚŲǤƗǭǃśĄĞōǟċčƚųNjĂ
+ƹƝǮŒǚģĘƥŷĢƦŔǐŶĂǴŀŢĬŧǚƃǷƗüƋĄďŦĝĖưĉƲšûǙƪųđĦųļĻǵƟŬŝŌǩĬőęDŽĺǴǣûơĜǙźůĈƳLjĴƩljšƢęǒƵŤƌƷĮƻ
+ǂƍČĎăŧƙúƊƯĞŔĮǤŚŐƜđķŜƧljǯǰǎIJǕŗDZƗǞƦŮǏĹĈžŖƻǀČƊƢǁŵǷşƵŏŨňŠǃƿƮüƲķƃśŪŮŠƝƖĚǃƺűĩƺƒċŅīğğŦų
+ǮƌƊǨƝƀüŴƄŗĈŴňƾƿŜņŦƁǙƩļǙƯżŇǝĉŹŒŢúĶāşƼĘƸŦDŽƇǠŶƯƳĞůįƸıňļĉƲŁDzńŒŞùƝŐŬƯīƢŻğŨąǰøČþƠĜÿLJIJ
+ĢſźĎŻžƐĠƗǖǦÿljďŊǮǪǣƼǣŸŸƧŬŵġǙśýǪţƍĵŞǤŭřúƽǚƻÿǂƀƢŠǡĠūNjƿûƱŗǨýøŞŎŅdžǃņŒŶŀāŰŞĚǜùĒĮDZăƚøŬ
+DŽDzĤŷƲƖijČœĂǁǡǩĖƶǴŕčŗƭƝƉƊǟņŴĜŊǪĉƏǡģƮǜǰīʼnǫǡƻğƿŮƻǰƢŎǶǨǨŮǙƛǕƮĝƧƝƎĄŷŰŪŋƛƅǪǯļƪøĄƿĿDZĻljĩ
+ùĶǂėłƥƾƻśƂĿŋljğĠĻǭǠĕŀǗĴƻdzœƜŧĴĶĞĵťƓǓžűǗŤǰƖīǛŻƻƈƿǙŬƒIJƇļÿƏĢƘăůŦņĸǴƬďŽǬŊŠĶǟŵNjŋƺǟţŝʼnŽ
+ŕƚƚƄǣŷŀþDžƬʼnƜĺǛĢĞĤŃąģļǵƸƜijœŧƲƟƞŹǘƚėĈŬŨŠDzŮǴŞĴĻĠƴƒǤơėƥƷœūDZnjƦčŽīǛūŲǝƤǰdžǕƥřDzĶŷſųĝƃłDŽ
+ǡćǮǨǞǮǷǖǀƺĨţǯǫǵƗŤťƩĒťǓDŽįŖǁĶǒšǝǮŤŭǚǃǮǏŪűťǧŅLJljǁǏſķƮǢĮƫƺĎǗŒǷǗŶƤƙƛƳƴŵĎƺǣDzĴŦĪŠŢdzƽŧťǎ
+ƪŋŁƳƥŶǗǭǧĵŹǍǯưǎǮČťǎķŐĐřŷƨǃƭƥĔŸƶśøøøøŁĽņļƦĺŘź''')
+
+# ./main.py
+"""
+Python & Pygame implementation of pressure-based soft body paper
+https://www.researchgate.net/publication/228574502_How_to_implement_a_pressure_soft_body_model
+"""
+import asyncio
+from dataclasses import dataclass
+from math import pi, sin, cos
+
+import pygame
+from pygame import Vector2
+import pygame._sdl2.video as sdl2
+
+
+async def main():
+
+    WINDOW_WIDTH = 750
+    WINDOW_HEIGHT = 750
+    MAX_FPS = 165
+    GRAVITY = 9.81
+    DT = 1.0 / 60.0
+    KS = 130.0
+    KD = 20.0
+    RESTITUTION = 0.1
+    PRESSURE = 300.0
+
+    pygame.init()
+    window = pygame._sdl2.video.Window(title="Pygame Pressure-based Softbody", size=(WINDOW_WIDTH, WINDOW_HEIGHT))
+    renderer = pygame._sdl2.video.Renderer(window)
+    clock = pygame.Clock()
+    is_running = True
+
+
+    @dataclass
+    class MassPoint:
+        position: Vector2
+        velocity: Vector2
+        force: Vector2
+        mass: float
+        mouse: bool = False
+
+    @dataclass
+    class Spring:
+        a: MassPoint
+        b: MassPoint
+        length: float
+        normal: Vector2
+        mouse: bool = False
+
+
+    masspoints: list[MassPoint] = []
+    uvs = []
+    springs: list[Spring] = []
+
+    n = 18
+    r = 6.0
+    for i in range(n):
+        masspoints.append(MassPoint(
+            Vector2(
+                37.5 + r * sin(i * (2.0 * pi) / n),
+                37.5 + r * cos(i * (2.0 * pi) / n)
+            ),
+            Vector2(),
+            Vector2(),
+            1.0
+        ))
+        uvs.append(
+            Vector2(
+                (sin(i * (2.0 * pi) / n) + 1) / 2,
+                (cos(i * (2.0 * pi) / n) + 1) / 2
+            )
+        )
+
+    for i in range(n):
+        a = masspoints[i - 1]
+        b = masspoints[i]
+        springs.append(Spring(
+            a,
+            b,
+            (b.position - a.position).length(),
+            Vector2()
+        ))
+
+    ground = 65.0
+
+    def step(dt: float) -> None:
+        # Apply external forces
+        for p in masspoints:
+            if p.mouse: continue
+
+            p.force += Vector2(0, p.mass * GRAVITY)
+
+        # Apply spring forces
+        for s in springs:
+            delta = s.a.position - s.b.position
+            dist = delta.length()
+            if dist == 0.0: continue
+
+            rv = s.a.velocity - s.b.velocity
+            f = (dist - s.length) * KS + (rv.x * (s.a.position.x - s.b.position.x) + rv.y * (s.a.position.y - s.b.position.y)) * KD / dist
+
+            force = (delta / dist) * f
+
+            s.a.force -= force
+            s.b.force += force
+
+            # Delta perp?
+            s.normal = Vector2(
+                (s.a.position.y - s.b.position.y) / dist,
+                -(s.a.position.x - s.b.position.x) / dist
+            )
+
+        # Calculate valume
+        volume = 0.0
+        for s in springs:
+            if s.mouse: continue
+
+            delta = s.a.position - s.b.position
+            dist = delta.length()
+
+            volume += 0.5 * abs(s.a.position.x - s.b.position.x) * abs(s.normal.x) * dist
+
+        #print(volume)
+
+        # Apply pressure forces
+        for s in springs:
+            if s.mouse: continue
+
+            delta = s.a.position - s.b.position
+            dist = delta.length()
+
+            pressure = dist * PRESSURE * (1.0 / volume)
+
+            s.a.force += pressure * s.normal
+            s.b.force += pressure * s.normal
+
+        # Semi-implicit euler integration
+        for p in masspoints:
+            if p.mouse: continue
+
+            p.velocity += p.force / p.mass * dt
+
+            # Solve collisions before integrating velocities
+            dy = p.position.y + p.velocity.y * dt
+            dx = p.position.x + p.velocity.x * dt
+            if dy > ground or dy < 0:
+                p.velocity.y *= -RESTITUTION
+            if dx > 75 or dx < 0:
+                p.velocity.x *= -RESTITUTION
+
+            p.position += p.velocity * dt
+
+            # Reset force accumulator
+            p.force = Vector2()
+
+    mouse_p = MassPoint(Vector2(), Vector2(), Vector2(), 1.0, mouse=True)
+    mouse_spring = Spring(None, mouse_p, 0.0, Vector2(), mouse=True)
+
+    image = pygame.image.load("blob.png")
+    tex = sdl2.Texture.from_surface(renderer, image)
+
+
+    paused = True
+
+    while is_running:
+        dt = clock.tick(MAX_FPS) / 1000
+
+        mouse = pygame.Vector2(*pygame.mouse.get_pos())
+
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                is_running = False
+
+            elif event.type == pygame.MOUSEBUTTONDOWN:
+                springs.append(mouse_spring)
+                paused = False
+
+                min_d = float("inf")
+                for p in masspoints:
+                    if p.mouse: continue
+
+                    d = (p.position - mouse / 10).length()
+                    if d < min_d:
+                        min_d = d
+                        mouse_spring.a = p
+
+
+            elif event.type == pygame.MOUSEBUTTONUP:
+                springs.remove(mouse_spring)
+
+        mouse_p.position = mouse / 10
+
+        if not paused: step(DT)
+
+        #window.fill((255, 255, 255))
+        renderer.draw_color = pygame.Color(255, 255, 255)
+        renderer.clear()
+
+        #for p in masspoints:
+        #    pygame.draw.circle(window, (255, 0, 0), p.position * 10, 5, 0)
+
+        #pygame.draw.polygon(window, (0, 255, 0), [p.position * 10 for p in masspoints if not p.mouse], 0)
+
+        #for s in springs:
+        #    pygame.draw.line(window, (15, 125, 70), s.a.position * 10, s.b.position * 10, 3)
+
+        #pygame.draw.line(window, (170, 170, 170), (0, ground*10), (750, ground*10), 1)
+
+        c = Vector2()
+        for p in masspoints:
+            if p.mouse: continue
+            c += p.position
+        c /= n
+
+        m = [p for p in masspoints if not p.mouse]
+        for i in range(n):
+            a = m[i]
+            b = m[(i + 1) % n]
+
+            tex.draw_triangle(
+                a.position * 10,
+                b.position * 10,
+                c * 10,
+                uvs[i],
+                uvs[(i + 1) % n],
+                (0.5, 0.5)
+            )
+
+        #pygame.display.flip()
+        renderer.present()
+        await asyncio.sleep(0)
+
+    pygame.quit()
+
+
+if __name__ == '__main__':
+    asyncio.run(main())