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A more performant version of DynamicShadows for html5 #307

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A more performant version of DynamicShadows for html5 #307

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9c5c89f
performance improvement for dynamic-shadows demo
UncertainProd Apr 6, 2023
5853363
Merge branch 'HaxeFlixel:dev' into dynamic-shadows
UncertainProd Jun 14, 2023
5a49804
Merge branch 'HaxeFlixel:dev' into dynamic-shadows
UncertainProd Jul 29, 2023
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60 changes: 46 additions & 14 deletions Effects/DynamicShadows/source/PlayState.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,11 @@ class PlayState extends FlxState
static inline var SHADOW_COLOR = 0xff2a2963;
static inline var OVERLAY_COLOR = 0xff887fff;

/**
* The radius around the gem that will be illuminated
*/
var lightRadius:Float = 50.0;

/**
* Only contains non-collidabe tiles
*/
Expand Down Expand Up @@ -117,6 +122,23 @@ class PlayState extends FlxState
fps = new FPS(10, 10, 0xffffff);
FlxG.stage.addChild(fps);
fps.visible = false;

initializeWalls();
}

function initializeWalls()
{
// The walls are on the egdes and don't need shadows
for(body in FlxNapeSpace.space.bodies)
{
for(shape in body.shapes)
{
if(shape.bounds.x <= TILE_SIZE || shape.bounds.y <= TILE_SIZE || shape.bounds.y >= FlxG.height - 2*TILE_SIZE || shape.bounds.x >= FlxG.width - 2*TILE_SIZE)
{
shape.userData.type = "Wall";
}
}
}
}

function createProps():Void
Expand Down Expand Up @@ -154,23 +176,36 @@ class PlayState extends FlxState

override public function update(elapsed:Float):Void
{
infoText.text = "FPS: " + fps.currentFPS + "\n\nObjects can be dragged/thrown around.\n\nPress 'R' to restart.";
infoText.text = "FPS: " + fps.currentFPS + "\n\nObjects can be dragged/thrown around.\n\nPress 'R' to restart.\n\nUse LEFT or RIGHT buttons to increase or decrease the illuminated radius of the Gem";

if (FlxG.keys.justPressed.R)
FlxG.resetState();

if (FlxG.keys.justPressed.D)
FlxNapeSpace.drawDebug = !FlxNapeSpace.drawDebug;

if(FlxG.keys.pressed.LEFT)
{
lightRadius -= 2;
}
if(FlxG.keys.pressed.RIGHT)
{
lightRadius += 2;
}

processShadows();
super.update(elapsed);
}

public function processShadows():Void
{
shadowCanvas.fill(FlxColor.TRANSPARENT);
shadowCanvas.fill(SHADOW_COLOR);
shadowOverlay.fill(OVERLAY_COLOR);

shadowCanvas.drawCircle( // radius of light around the Gem
gem.body.position.x + FlxG.random.float(-.25, .25), gem.body.position.y + FlxG.random.float(-.25, .25),
(FlxG.random.bool(5) ? lightRadius : lightRadius + 0.5), OVERLAY_COLOR);

shadowOverlay.drawCircle( // outer red circle
gem.body.position.x + FlxG.random.float(-.6, .6), gem.body.position.y + FlxG.random.float(-.6, .6),
(FlxG.random.bool(5) ? 16 : 16.5), 0xffff5f5f);
Expand All @@ -179,18 +214,14 @@ class PlayState extends FlxState
gem.body.position.x + FlxG.random.float(-.25, .25), gem.body.position.y + FlxG.random.float(-.25, .25),
(FlxG.random.bool(5) ? 13 : 13.5), 0xffff7070);

for (body in FlxNapeSpace.space.bodies)
{
// We don't want to draw any shadows around the gem, since it's the light source
if (body.userData.type != "Gem")
processBodyShapes(body);
}
}

function processBodyShapes(body:Body)
{
for (shape in body.shapes)
var tempLightOrigin:Vec2 = Vec2.get(gem.body.position.x + FlxG.random.float(-.3, 3), gem.body.position.y + FlxG.random.float(-.3, .3));
for (shape in FlxNapeSpace.space.shapesInCircle(tempLightOrigin, lightRadius))
{
if(shape.userData.type == "Wall" || shape.body.userData.type == "Gem") // don't draw shadows behind the walls (which aren't gonna be visible to us) or around the Gem itself
{
continue;
}

var verts:Vec2List = shape.castPolygon.worldVerts;

for (i in 0...verts.length)
Expand Down Expand Up @@ -224,9 +255,10 @@ class PlayState extends FlxState
{
var lightToPoint:Vec2 = point.copy();
lightToPoint.subeq(light);
lightToPoint.normalise();

var projectedPoint:Vec2 = point.copy();
return projectedPoint.addeq(lightToPoint.muleq(.45));
return projectedPoint.addeq(lightToPoint.muleq(lightRadius));
}

function doesEdgeCastShadow(start:Vec2, end:Vec2, light:Vec2):Bool
Expand Down