[adapters] 增加小游戏适配部分源码

adapters/platforms/alipay/wrapper/engine/AudioEngine.js

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+if (cc && cc.audioEngine) {
+    cc.audioEngine._maxAudioInstance = 6;
+}

adapters/platforms/alipay/wrapper/engine/Label.js

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+if (cc && cc.Label) {
+    const gfx = cc.gfx;
+    const Label = cc.Label;
+
+    // shared label canvas
+    let _sharedLabelCanvas = document.createElement('canvas');
+    let _sharedLabelCanvasCtx = _sharedLabelCanvas.getContext('2d');
+    let canvasData = {
+        canvas: _sharedLabelCanvas,
+        context: _sharedLabelCanvasCtx,
+    };
+    cc.game.on(cc.game.EVENT_ENGINE_INITED, function () {
+        Object.assign(Label._canvasPool, {
+            get() {
+                return canvasData;
+            },
+
+            put() {
+                // do nothing
+            }
+        });
+    });
+
+    let _originUpdateMaterial = Label.prototype._updateMaterialWebgl;
+    // fix ttf font black border
+    Object.assign(Label.prototype, {
+        _updateMaterialWebgl () {
+            _originUpdateMaterial.call(this);
+
+            // init blend factor
+            let material = this._materials[0];
+            if (!this._frame || !material) {
+                return;
+            }
+            let dstBlendFactor = cc.macro.BlendFactor.ONE_MINUS_SRC_ALPHA;
+            let srcBlendFactor;
+            if (!(__globalAdapter.isDevTool || this.font instanceof cc.BitmapFont)) {
+                // Premultiplied alpha on runtime
+                srcBlendFactor = cc.macro.BlendFactor.ONE;
+            }
+            else {
+                srcBlendFactor = cc.macro.BlendFactor.SRC_ALPHA;
+            }
+
+            // set blend func
+            material.effect.setBlend(
+                true,
+                gfx.BLEND_FUNC_ADD,
+                srcBlendFactor, dstBlendFactor,
+                gfx.BLEND_FUNC_ADD,
+                srcBlendFactor, dstBlendFactor,
+            );
+        },
+    });
+}

adapters/platforms/alipay/wrapper/engine/index.js

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+require('./Label');
+require('./AudioEngine');