shader fun

src/main.js

@@ -18,14 +18,13 @@ var container = new PIXI.Container();
 var hud = new PIXI.Container();
 var endC = new PIXI.Container();
 endC.visible = false
-app.stage.addChild(container);
-app.stage.addChild(hud);
-app.stage.addChild(endC);
 
 const resources = PIXI.loader.resources
 
 var player, state, objects, maxX, lastKey, PTS_WATER, PTS_COWS, END_TXT
-
+var lanterns
+var moos
+var shader, quad
 PIXI.loader
   .add("assets/player.png")
   .add("assets/player_still.png")
@@ -34,6 +33,7 @@ PIXI.loader
   .add("assets/water.png")
   .add("assets/vodkaguy.png")
   .add("assets/grass.png")
+  .add("assets/lantern.png")
   .load(setup);
 
 function setup () {
@@ -51,12 +51,27 @@ function setup () {
 
 
   PTS_WATER.y = 20
-  PTS_WATER.x = 20
+  PTS_WATER.x = 50
+
+
   PTS_COWS.y = 50
-  PTS_COWS.x = 20
+  PTS_COWS.x = 50
 
   hud.addChild(PTS_WATER)
+  const hudCow = new PIXI.Sprite(resources['assets/cow.png'].texture)
+  hudCow.width = 24
+  hudCow.height = 24
+  hudCow.y = 50
+  hudCow.x = 20
+
+  const hudWater = new PIXI.Sprite(resources['assets/water.png'].texture)
+  hudWater.width = 24
+  hudWater.height = 24
+  hudWater.y = 20
+  hudWater.x = 20
   hud.addChild(PTS_COWS)
+  hud.addChild(hudCow)
+  hud.addChild(hudWater)
 
   const vodkaguy = new PIXI.Sprite(vodkaguyTexture)
   container.addChild(vodkaguy)
@@ -159,6 +174,7 @@ function setup () {
     cow.vrot = 0
     cow.ticks = 0
     cow.type = 'cow'
+    cow.lastmoo = 0
     container.addChild(cow)
 
     objects.push(cow)
@@ -166,8 +182,6 @@ function setup () {
     maxX = Math.max(maxX, cow.x + cow.width)
   }
 
-  grass.x = maxX
-
   for (let i = 0; i < waters; i++) {
     const water = new PIXI.Sprite(waterTexture)
     water.anchor.x = 0.5
@@ -189,12 +203,130 @@ function setup () {
     maxX = Math.max(maxX, water.x + water.width)
   }
 
+
+  grass.x = maxX
+
+//  0    TAW                          maxX
+//  |    |                            |    |
+  // i want to have 10 lanterns !
+  const LANTERN_COUNT = 10
+  const availableWidth = (maxX - TARGET_AREA_WIDTH) - 50
+  const lanternDist = availableWidth / (LANTERN_COUNT-1)
+
+  lanterns = []
+  for (let i = 0; i < LANTERN_COUNT; i++) {
+    // lantern on bottom
+    const lantern = new PIXI.Sprite(resources['assets/lantern.png'].texture)
+    lantern.anchor.set(.5, .5)
+    lantern.x = TARGET_AREA_WIDTH + (lantern.width / 2) + (i * lanternDist)
+    lantern.y = HEIGHT - lantern.height /2
+    lanterns.push(lantern)
+    container.addChild(lantern)
+  }
+  for (let i = 0; i < LANTERN_COUNT; i++) {
+    // lantern on top
+    const lantern = new PIXI.Sprite(resources['assets/lantern.png'].texture)
+    lantern.anchor.set(.5, .5)
+    lantern.x = TARGET_AREA_WIDTH + (lantern.width / 2) + (i * lanternDist)
+    lantern.y = lantern.height /2
+
+    lanterns.push(lantern)
+    container.addChild(lantern)
+  }
+
   container.addChild(player)
 
   endC.addChild(END_TXT)
 
+
+  moos = []
+
   state = play;
 
+
+
+  // shader stuff
+
+  // Build geometry.
+  const geometry = new PIXI.Geometry()
+    .addAttribute('aVertexPosition', // the attribute name
+      [
+        -400, -300, // x, y
+        400, -300, // x, y
+        400, 300,
+        -400, 300
+      ], // x, y
+      2) // the size of the attribute
+    .addIndex([0, 1, 2, 0, 2, 3]);
+
+  const vertexSrc = `
+  precision mediump float;
+  attribute vec2 aVertexPosition;
+
+  uniform mat3 translationMatrix;
+  uniform mat3 projectionMatrix;
+
+  void main() {
+      gl_Position = vec4((projectionMatrix * translationMatrix * vec3(aVertexPosition, 1.0)).xy, 0.0, 1.0);
+  }`;
+
+
+  const fragmentSrc = `
+  varying vec2 vUvs;
+  uniform vec2 playerPos;
+  uniform float time;
+  uniform vec2 lanternPositions[20];
+
+  void main() {
+    float minLight = .8;
+    float flickerspeed = 50.0;
+    float lightradius = 60.0 + sin(time * flickerspeed/4.0) * 5.0;
+    for (int i = 0; i < 20; i++) {
+      vec2 d = lanternPositions[i] - gl_FragCoord.xy;
+      float dist = length(d);
+      if (dist < lightradius) {
+        float L = (dist / lightradius) * .9;
+        if (L < minLight) {
+          minLight = L;
+        }
+      }
+    }
+
+    flickerspeed = 7.0;
+    lightradius = 100.0 + sin(time * flickerspeed/4.0) * 5.0;
+    vec2 d = playerPos - gl_FragCoord.xy;
+    float dist = length(d);
+    if (dist < lightradius) {
+      float L = (dist / lightradius) * .9;
+      if (L < minLight) {
+        minLight = L;
+      }
+    }
+
+    gl_FragColor = vec4(
+      sin(time*flickerspeed) *.1,
+      sin(time*flickerspeed) *.1,
+      sin(time*flickerspeed) *.1,
+      minLight
+    );
+  }`;
+
+  const uniforms = {
+    time: 0,
+    player_y: player.y
+  };
+
+  // Build the shader and the quad.
+  shader = PIXI.Shader.from(vertexSrc, fragmentSrc, uniforms);
+  quad = new PIXI.Mesh(geometry, shader);
+  quad.position.set(400, 300)
+
+  app.stage.addChild(container);
+  app.stage.addChild(quad);
+  app.stage.addChild(hud);
+  app.stage.addChild(endC);
+
+
   //Start the game loop
   app.ticker.add(delta => gameLoop(delta));
 }
@@ -207,18 +339,17 @@ function gameLoop(delta){
 function end(delta) {
   hud.visible = false
   endC.visible = true
-  if (player.scale.x < 250) {
+  if (player.scale.x < 290) {
     player.scale.x += 5
     player.scale.y += 5
   } else {
-    END_TXT.anchor.x = .5
-    END_TXT.anchor.y = .5
-    END_TXT.x = player.x
-    END_TXT.y = player.y
+    quad.visible = false
+    END_TXT.x = WIDTH / 2 - END_TXT.width / 2
+    END_TXT.y = HEIGHT / 2 - END_TXT.height / 2
     END_TXT.visible = true
   }
 }
-
+var time = 0
 
 var blinkStart
 const BLINK_DUR = 250
@@ -332,6 +463,56 @@ function play(delta) {
     }
   }
 
+  for (const c of objects) {
+    if (c.type === 'cow') {
+      if (c.vrot > 0 && c.ticks > 0) {
+        if (c.lastmoo === 0 || (now - c.lastmoo > 500)) {
+          c.lastmoo = now
+          const moo = new PIXI.Text('!moooo', {fontFamily : 'Arial', fontSize: 14, fill : 0xff0000, align : 'center'})
+          moo.x = c.x
+          moo.y = c.y
+          moo.anchor.set(.5, .5)
+
+          let r = Math.random()
+          if (r < 1/3) {
+            moo.vx = 0
+          } else if (r < 2/3) {
+            moo.vx = 1
+          } else {
+            moo.vx = -1
+          }
+          if (moo.vx === 0) {
+            r = Math.random()
+            moo.vy = r < .5 ? 1 : -1
+          } else {
+            r = Math.random()
+            if (r < 1/3) {
+              moo.vy = 0
+            } else if (r < 2/3) {
+              moo.vy = 1
+            } else {
+              moo.vy = -1
+            }
+          }
+          moo.rotation = Math.atan2(moo.vx, moo.vy)
+
+          moo.alpha = 1
+          moos.push(moo);
+          container.addChild(moo)
+        }
+      }
+    }
+  }
+  for (const obj of moos) {
+    obj.x += obj.vx
+    obj.y += obj.vy
+    obj.alpha -= .01
+    if (obj.alpha <= 0) {
+      container.removeChild(obj)
+    }
+  }
+  moos = moos.filter(moo => moo.alpha > 0)
+
   let ptsWater = 0
   let ptsCows = 0
   for (const obj of objects) {
@@ -387,6 +568,22 @@ function play(delta) {
   if (ptsWater >= 20 && ptsCows >= 20) {
     state = end
   }
+
+  time += 1 / 60;
+  quad.shader.uniforms.time = time;
+  quad.shader.uniforms.playerPos = [
+    player.x + container.x,
+    HEIGHT - player.y
+  ];
+  const lanternPositions = []
+  lanterns.forEach(l => {
+    lanternPositions.push(l.x + container.x)
+    lanternPositions.push(HEIGHT - l.y)
+  })
+  quad.shader.uniforms.lanternPositions = lanternPositions
+
+  /// FFFFUFFUUUUUUUUU
+  // quad.scale.set(Math.cos(time) * 1 + 2, Math.sin(time * 0.7) * 1 + 2);
 }
 
 //The `keyboard` helper function