private CompiledShader ParseShader(XmlDocument doc)
{
if(doc.DocumentElement.Name != "shader")
throw new Exception("Invalid shader file");
ShaderLoader that = this;
/*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;
/*the lists of all unoforms and attributes-*/
List<String> uniforms = new List<string>();
List<String> attributes = new List<string>();
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") {
uniforms.Add(XmlHelper.InnerText(xmlNode));
} else if(xmlNode.Name == "attribute") {
attributes.Add(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.Attributes = new Dictionary<string, int>();
ret.Uniforms = new Dictionary<string, IUniformLocation>();
/*attribute locations*/
attributes.ForEach(delegate(string value) {
ret.Attributes[value] = that._gl.GetAttribLocation(shaderProgram, value);
});
/*uniform locations*/
uniforms.ForEach(delegate(string value) {
ret.Uniforms[value] = that._gl.GetUniformLocation(shaderProgram, value);
});
ret.ShaderProgram = shaderProgram;
return ret;
}
//-----------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------
public void BindShader(CompiledShader shader)
{
this._context.UseProgram(shader.ShaderProgram);
}
