private static GLShader GetShader(WebGLContext gl, string id)
{
var shaderScript = Element.GetById(id);
var str = shaderScript.TextContent;
if (str == "" || str == null)
{
var k = shaderScript.FirstChild;
while (k != null)
{
if (k.NodeType == 3)
str += k.TextContent;
k = k.NextSibling;
}
}
GLShader shader;
if (shaderScript.GetAttributeValue("type") == "x-shader/x-fragment")
{
shader = gl.CreateShader(gl.FragmentShader);
}
else if (shaderScript.GetAttributeValue("type") == "x-shader/x-vertex")
{
shader = gl.CreateShader(gl.VertexShader);
}
else
{
return null;
}
gl.ShaderSource(shader, str);
gl.CompileShader(shader);
if (!gl.GetShaderParameter(shader, gl.CompileStatus))
{
throw new Exception("Shader compilation failed");
}
return shader;
}
private static void initGL(Canvas canvas)
{
gl = canvas.GetWebGLContext();
viewportWidth = canvas.Width = 500;
viewportHeight = canvas.Height = 500;
}
public static WebGLContext GetWebGLContext(this Canvas canvas)
{
return(WebGLContext.GetContext(canvas));
}
