var BABYLON = BABYLON || {};

(function () {
    BABYLON.RenderTargetTexture = function (name, size, scene, generateMipMaps) {
        this._scene = scene;
        this._scene.textures.push(this);

        this.name = name;        

        this._texture = scene.getEngine().createRenderTargetTexture(size, generateMipMaps);
    };

    BABYLON.RenderTargetTexture.prototype = Object.create(BABYLON.Texture.prototype);

    // Members
    BABYLON.RenderTargetTexture.prototype.renderList = [];
    BABYLON.RenderTargetTexture.prototype.isRenderTarget = true;
    BABYLON.RenderTargetTexture.prototype.coordinatesMode = BABYLON.Texture.PROJECTION_MODE;

    // Methods  
    BABYLON.RenderTargetTexture.prototype.onBeforeRender = null;
    BABYLON.RenderTargetTexture.prototype.onAfterRender = null;
    
    BABYLON.RenderTargetTexture.prototype.render = function () {
        if (this.onBeforeRender) {
            this.onBeforeRender();
        }

        var scene = this._scene;
        var engine = scene.getEngine();
        
        if (this._waitingRenderList) {
            this.renderList = [];
            for (var index = 0; index < this._waitingRenderList.length; index++) {
                var id = this._waitingRenderList[index];
                this.renderList.push(this._scene.getMeshByID(id));
            }

            delete this._waitingRenderList;
        }

        if (!this.renderList || this.renderList.length == 0) {
            return;
        }
        
        // Bind
        engine.bindFramebuffer(this._texture);

        // Clear
        engine.clear(scene.clearColor, true, true);
        
        // Dispatch subMeshes
        this._opaqueSubMeshes = [];
        this._transparentSubMeshes = [];
        this._alphaTestSubMeshes = [];
        
        for (var meshIndex = 0; meshIndex < this.renderList.length; meshIndex++) {
            var mesh = this.renderList[meshIndex];

            if (mesh.material && mesh.isEnabled() && mesh.isVisible) {
                for (var subIndex = 0; subIndex < mesh.subMeshes.length; subIndex++) {
                    var subMesh = mesh.subMeshes[subIndex];
                    var material = subMesh.getMaterial();
                    
                    if (material.needAlphaTesting()) { // Alpha test
                        this._alphaTestSubMeshes.push(subMesh);
                    } else if (material.needAlphaBlending()) { // Transparent
                        if (material.alpha > 0) {
                            this._transparentSubMeshes.push(subMesh); // Opaque
                        }
                    } else {
                        this._opaqueSubMeshes.push(subMesh);
                    }
                }
            }
        }
        
        // Render
        scene._localRender(this._opaqueSubMeshes, this._alphaTestSubMeshes, this._transparentSubMeshes, this.renderList);

        // Unbind
        engine.unBindFramebuffer(this._texture);
        
        if (this.onAfterRender) {
            this.onAfterRender();
        }
    };

})();