/// <summary>
/// Draw the attributes of this vertex array.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for rendering.
/// </param>
/// <param name="shader">
/// The <see cref="ShaderProgram"/> used for drawing the vertex arrays.
/// </param>
public virtual void Draw(GraphicsContext ctx, ShaderProgram shader)
{
CheckThisExistence(ctx);
if (shader != null && shader.Exists(ctx) == false)
throw new ArgumentException("not existing", "shader");
// If vertex was modified after creation, don't miss to create array buffers
if (_VertexArrayDirty) CreateObject(ctx);
// Set vertex arrays
SetVertexArrayState(ctx, shader);
// Fixed or programmable pipeline?
if ((shader == null) && (ctx.Caps.GlExtensions.VertexShader_ARB == true))
ShaderProgram.Unbind(ctx);
else if (shader != null)
shader.Bind(ctx);
// Issue rendering using shader
foreach (Element attributeElement in DrawElements) {
if (_FeedbackBuffer != null)
_FeedbackBuffer.Begin(ctx, attributeElement.ElementsMode);
attributeElement.Draw(ctx);
if (_FeedbackBuffer != null)
_FeedbackBuffer.End(ctx);
}
}
/// <summary>
/// Render this vertex array.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for rendering.
/// </param>
/// <param name="shaderProgram">
/// The <see cref="ShaderProgram"/> used for drawing this vertex array.
/// </param>
public override void Draw(GraphicsContext ctx, ShaderProgram shaderProgram)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (ctx.IsCurrent == false)
throw new ArgumentException("not current", "ctx");
if (shaderProgram == null)
throw new ArgumentNullException("shaderProgram");
if (shaderProgram.Exists(ctx) == false)
throw new ArgumentException("not existing", "shaderProgram");
if (Exists(ctx) == false)
throw new InvalidOperationException("not existing");
if (_Elements.Count == 0 && _PatchElement == null)
throw new InvalidOperationException("no elements defined");
if (_PatchElement != null) {
// Setup patch vertices
Gl.PatchParameter(Gl.PATCH_VERTICES, (int)_PatchElement.PatchCount);
// GL_PATCH_DEFAULT_OUTER_LEVEL | GL_PATCH_DEFAULT_INNER_LEVEL
// Set vertex arrays
SetVertexArrayState(ctx, shaderProgram);
// Uses shader
shaderProgram.Bind(ctx);
// Draw patches
_PatchElement.Draw(ctx);
}
// Based implementation
if (_Elements.Count > 0)
base.Draw(ctx, shaderProgram);
}