Babylon.js/Babylon/Rendering/babylon.renderingGroup.js

var BABYLON;
(function (BABYLON) {
    var RenderingGroup = (function () {
        function RenderingGroup(index, scene) {
            this.index = index;
            this._opaqueSubMeshes = new BABYLON.SmartArray(256);
            this._transparentSubMeshes = new BABYLON.SmartArray(256);
            this._alphaTestSubMeshes = new BABYLON.SmartArray(256);
            this._scene = scene;
        }
        RenderingGroup.prototype.render = function (customRenderFunction) {
            if (customRenderFunction) {
                customRenderFunction(this._opaqueSubMeshes, this._alphaTestSubMeshes, this._transparentSubMeshes);
                return true;
            }

            if (this._opaqueSubMeshes.length === 0 && this._alphaTestSubMeshes.length === 0 && this._transparentSubMeshes.length === 0) {
                return false;
            }
            var engine = this._scene.getEngine();

            // Opaque
            var subIndex;
            var submesh;

            for (subIndex = 0; subIndex < this._opaqueSubMeshes.length; subIndex++) {
                submesh = this._opaqueSubMeshes.data[subIndex];

                submesh.render();
            }

            // Alpha test
            engine.setAlphaTesting(true);
            for (subIndex = 0; subIndex < this._alphaTestSubMeshes.length; subIndex++) {
                submesh = this._alphaTestSubMeshes.data[subIndex];

                submesh.render();
            }
            engine.setAlphaTesting(false);

            // Transparent
            if (this._transparentSubMeshes.length) {
                for (subIndex = 0; subIndex < this._transparentSubMeshes.length; subIndex++) {
                    submesh = this._transparentSubMeshes.data[subIndex];
                    submesh._alphaIndex = submesh.getMesh().alphaIndex;
                    submesh._distanceToCamera = submesh.getBoundingInfo().boundingSphere.centerWorld.subtract(this._scene.activeCamera.position).length();
                }

                var sortedArray = this._transparentSubMeshes.data.slice(0, this._transparentSubMeshes.length);

                sortedArray.sort(function (a, b) {
                    // Alpha index first
                    if (a._alphaIndex > b._alphaIndex) {
                        return 1;
                    }
                    if (a._alphaIndex < b._alphaIndex) {
                        return -1;
                    }

                    // Then distance to camera
                    if (a._distanceToCamera < b._distanceToCamera) {
                        return 1;
                    }
                    if (a._distanceToCamera > b._distanceToCamera) {
                        return -1;
                    }

                    return 0;
                });

                // Rendering
                engine.setAlphaMode(BABYLON.Engine.ALPHA_COMBINE);
                for (subIndex = 0; subIndex < sortedArray.length; subIndex++) {
                    submesh = sortedArray[subIndex];

                    submesh.render();
                }
                engine.setAlphaMode(BABYLON.Engine.ALPHA_DISABLE);
            }
            return true;
        };

        RenderingGroup.prototype.prepare = function () {
            this._opaqueSubMeshes.reset();
            this._transparentSubMeshes.reset();
            this._alphaTestSubMeshes.reset();
        };

        RenderingGroup.prototype.dispatch = function (subMesh) {
            var material = subMesh.getMaterial();
            var mesh = subMesh.getMesh();

            if (material.needAlphaBlending() || mesh.visibility < 1.0 || mesh.hasVertexAlpha) {
                this._transparentSubMeshes.push(subMesh);
            } else if (material.needAlphaTesting()) {
                this._alphaTestSubMeshes.push(subMesh);
            } else {
                this._opaqueSubMeshes.push(subMesh); // Opaque
            }
        };
        return RenderingGroup;
    })();
    BABYLON.RenderingGroup = RenderingGroup;
})(BABYLON || (BABYLON = {}));
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