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ResourceManager.cs
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ResourceManager.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Serialization;
using GLSharp.Graphics;
using System.Xml;
using GLSharp.Util.Xml;
namespace GLSharp.Data {
public interface IResourceLoader {
/// <summary>
/// Returns the suported extensions by the loader.
/// </summary>
List<String> Extension { get; }
/// <summary>
/// Loads the given resource.
/// </summary>
/// <param name="url">The url at which the resource is located.</param>
/// <returns>The loaded resouces.</returns>
Resource Load(String url);
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public class ImageLoader : IResourceLoader {
public List<string> Extension {
get {
List<String> ret = new List<String>();
ret.Add(".jpg");
ret.Add(".png");
ret.Add(".jpeg");
return ret;
}
}
public Resource Load(string url) {
Resource ret = new Resource();
ret.Finished = false;
Image img = new Image();
img.OnLoad = delegate {
ret.Finished = true;
ret.Data = img;
};
img.Src = url;
return ret;
}
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public class JsonLoader : IResourceLoader {
public List<string> Extension {
get {
List<String> ret = new List<String>();
ret.Add(".json");
return ret;
}
}
public Resource Load(string url) {
Resource ret = new Resource();
ret.Finished = false;
XmlHttpRequest req = new XmlHttpRequest();
req.Open(HttpVerb.Get, url, true);
req.OnReadyStateChange = delegate () {
if(req.ReadyState == ReadyState.Loaded && req.Status == 200) {
ret.Finished = true;
ret.Data = Json.Parse(req.ResponseText);
}
};
req.Send();
return ret;
}
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public class ShaderLoader : IResourceLoader {
private WebGL _gl = null;
public ShaderLoader(WebGL gl) {
this._gl = gl;
}
public List<string> Extension {
get {
List<String> ret = new List<String>();
ret.Add(".shader");
return ret;
}
}
public Resource Load(string url) {
Resource ret = new Resource();
ret.Finished = false;
XmlHttpRequest req = new XmlHttpRequest();
req.Open(HttpVerb.Get, url, true);
req.OnReadyStateChange = delegate() {
if (req.ReadyState == ReadyState.Loaded && req.Status == 200) {
ret.Finished = true;
/*parse the xml document*/
ret.Data = this.ParseShader(XmlDocumentParser.Parse(req.ResponseText));
}
};
req.Send();
return ret;
}
private ICompiledShader ParseShader(XmlDocument doc) {
if(doc.DocumentElement.Name != "shader")
throw new Exception("Invalid shader file");
/*source code for vertex / fragment shaders*/
String sourceFragment = null;
String sourceVertex = null;
CompiledShader ret = new CompiledShader();
/*the name of the shader*/
ret.Name = doc.DocumentElement.Attributes.GetNamedItem("name").Value;
foreach (XmlNode xmlNode in doc.DocumentElement.ChildNodes) {
if (xmlNode.NodeType != XmlNodeType.Element) continue;
if(xmlNode.Name == "vertex_shader") {
sourceVertex = XmlHelper.InnerText(xmlNode);
} else if(xmlNode.Name == "fragment_shader") {
sourceFragment = XmlHelper.InnerText(xmlNode);
} else if(xmlNode.Name == "uniform") {
//ret.Uniforms[XmlHelper.InnerText(xmlNode)]
}
}
if(sourceFragment == null || sourceVertex == null)
throw new Exception("Shader file does not contain fragment and vertex shaders");
/*compile shaders*/
IShader shaderFragment = this.CompileShader(sourceFragment, WebGLE.FragmentShader);
IShader shaderVertex = this.CompileShader(sourceVertex, WebGLE.VertexShader);
/*create the program*/
IShaderProgram shaderProgram = this._gl.CreateProgram();
this._gl.AttachShader(shaderProgram, shaderFragment);
this._gl.AttachShader(shaderProgram, shaderVertex);
this._gl.LinkProgram(shaderProgram);
if (!(bool)this._gl.GetProgramParameter(shaderProgram, WebGLE.LinkStatus)) {
throw new Exception("Cannot link shaders.");
}
ret.ShaderProgram = shaderProgram;
return ret;
}
private IShader CompileShader(String source, int type) {
IShader ret = this._gl.CreateShader(type);
this._gl.ShaderSource(ret, source);
this._gl.CompileShader(ret);
if(!(bool)this._gl.GetShaderParameter(ret, WebGLE.CompileStatus)) {
throw new Exception("Cannot compile shader.");
}
return ret;
}
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public class ResourceManager : IResourceManager {
private readonly Dictionary<String, IResourceLoader> _loaders = new Dictionary<string, IResourceLoader>();
private String _rootUrl = @"";
public String RootUrl {
get { return _rootUrl; }
set { _rootUrl = value; }
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public Resource GetResource(string resource) {
/*get the extension*/
int lastPeriod = resource.LastIndexOf('.');
String extension = "";
if (lastPeriod > -1) extension = (resource.Substring(lastPeriod, resource.Length)).ToLowerCase();
/*try to load the resource*/
IResourceLoader loader = this._loaders[extension];
if (loader == null)
throw new Exception("The specified resource is unsuppoted");
return loader.Load(this.RootUrl + resource);
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public bool FreeResource(string resource) {
return false;
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public void AddLoader(IResourceLoader loader) {
foreach (String ext in loader.Extension) {
this._loaders[ext.ToLowerCase()] = loader;
}
}
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
public void RemoveLoader(IResourceLoader loader) {
foreach (String ext in loader.Extension) {
this._loaders.Remove(ext.ToLowerCase());
}
}
}
}