/// <summary>
/// 在OpenGL中创建VAO。
/// 创建的过程就是执行一次渲染的过程。
/// <para>Creates VAO and bind it to specified VBOs.</para>
/// <para>The whole process of binding is also the process of rendering.</para>
/// </summary>
/// <param name="shaderProgram"></param>
public void Initialize(ShaderProgram shaderProgram)
{
if (this.Id != 0)
{
return;
}
//{ throw new Exception(string.Format("Id[{0}] is already generated!", this.Id)); }
if (glGenVertexArrays == null)
{
glGenVertexArrays = OpenGL.GetDelegateFor <OpenGL.glGenVertexArrays>();
glBindVertexArray = OpenGL.GetDelegateFor <OpenGL.glBindVertexArray>();
glDeleteVertexArrays = OpenGL.GetDelegateFor <OpenGL.glDeleteVertexArrays>();
}
glGenVertexArrays(1, ids);
this.Bind();// this vertex array object will record all stand-by actions.
VertexBuffer[] vertexAttributeBuffers = this.VertexAttributeBuffers;
if (vertexAttributeBuffers != null)
{
foreach (VertexBuffer item in vertexAttributeBuffers)
{
item.Standby(shaderProgram);
}
}
this.Unbind();// this vertex array object has recorded all stand-by actions.
}
/// <summary>
/// 一个vertex array object。（即VAO）
/// <para>VAO是用来管理VBO的。可以进一步减少DrawCall。</para>
/// </summary>
/// <param name="propertyBufferPtrs">给出此VAO要管理的所有VBO。</param>
public VertexArrayObject(IndexBufferPtr indexBufferPtr, params BufferPtr[] propertyBufferPtrs)
{
if (indexBufferPtr == null)
{
throw new ArgumentNullException("indexBufferRenderer");
}
if (propertyBufferPtrs == null || propertyBufferPtrs.Length == 0)
{
throw new ArgumentNullException("propertyBuffers");
}
if (glGenVertexArrays == null)
{
glGenVertexArrays = OpenGL.GetDelegateFor <OpenGL.glGenVertexArrays>();
glBindVertexArray = OpenGL.GetDelegateFor <OpenGL.glBindVertexArray>();
glDeleteVertexArrays = OpenGL.GetDelegateFor <OpenGL.glDeleteVertexArrays>();
}
this.indexBufferPtr = indexBufferPtr;
this.propertyBufferPtrs = propertyBufferPtrs;
}
/// <summary>
/// 一个vertex array object。（即VAO）
/// <para>VAO是用来管理VBO的。可以进一步减少DrawCall。</para>
/// </summary>
/// <param name="propertyBufferPtrs">给出此VAO要管理的所有VBO。</param>
public VertexArrayObject(IndexBufferPtr indexBufferPtr, params BufferPtr[] propertyBufferPtrs)
{
if (indexBufferPtr == null)
{
throw new ArgumentNullException("indexBufferRenderer");
}
if (propertyBufferPtrs == null || propertyBufferPtrs.Length == 0)
{
throw new ArgumentNullException("propertyBuffers");
}
if (glGenVertexArrays == null)
{
glGenVertexArrays = OpenGL.GetDelegateFor<OpenGL.glGenVertexArrays>();
glBindVertexArray = OpenGL.GetDelegateFor<OpenGL.glBindVertexArray>();
glDeleteVertexArrays = OpenGL.GetDelegateFor<OpenGL.glDeleteVertexArrays>();
}
this.IndexBufferPtr = indexBufferPtr;
this.propertyBufferPtrs = propertyBufferPtrs;
}
/// <summary>
/// 在OpenGL中创建VAO。
/// 创建的过程就是执行一次渲染的过程。
/// <para>Creates VAO and bind it to specified VBOs.</para>
/// <para>The whole process of binding is also the process of rendering.</para>
/// </summary>
/// <param name="shaderProgram"></param>
public void Initialize(ShaderProgram shaderProgram)
{
if (this.Id != 0)
{ throw new Exception(string.Format("Id[{0}] is already generated!", this.Id)); }
if (glGenVertexArrays == null)
{
glGenVertexArrays = OpenGL.GetDelegateFor<OpenGL.glGenVertexArrays>();
glBindVertexArray = OpenGL.GetDelegateFor<OpenGL.glBindVertexArray>();
glDeleteVertexArrays = OpenGL.GetDelegateFor<OpenGL.glDeleteVertexArrays>();
}
glGenVertexArrays(1, ids);
this.Bind();// this vertex array object will record all stand-by actions.
VertexBuffer[] vertexAttributeBuffers = this.VertexAttributeBuffers;
if (vertexAttributeBuffers != null)
{
foreach (VertexBuffer item in vertexAttributeBuffers)
{
item.Standby(shaderProgram);
}
}
this.Unbind();// this vertex array object has recorded all stand-by actions.
}
