/// <summary>
///
/// </summary>
public void Draw()
{
int instanceCount = this.InstanceCount;
uint mode = (uint)this.CurrentMode;
IndexBuffer indexBuffer = this.indexBuffer;
int vertexCount = indexBuffer.Length;
IndexBufferElementType elementType = indexBuffer.ElementType;
IntPtr offset = GetOffset(elementType, this.FirstVertex);
uint rs = this.PrimitiveRestartIndex;
if (rs != 0)
{
GL.Instance.Enable(GL.GL_PRIMITIVE_RESTART);
glPrimitiveRestartIndex(rs);
}
GLBuffer.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, indexBuffer.BufferId);
glDrawElementsInstanced(mode, this.VertexCount, (uint)elementType, offset, instanceCount);
GLBuffer.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, 0);
if (rs != 0)
{
GL.Instance.Disable(GL.GL_PRIMITIVE_RESTART);
}
}
/// <summary>
///
/// </summary>
/// <param name="controlMode">index buffer is accessable randomly or only by frame.</param>
public void Draw(ControlMode controlMode)
{
int instanceCount = this.InstanceCount;
if (instanceCount < 1)
{
throw new Exception("error: instanceCount is less than 1.");
}
int frameCount = this.FrameCount;
if (frameCount < 1)
{
throw new Exception("error: frameCount is less than 1.");
}
uint mode = (uint)this.Mode;
IndexBuffer indexBuffer = this.indexBuffer;
int vertexCount = indexBuffer.Length;
IndexBufferElementType elementType = indexBuffer.ElementType;
IntPtr offset = GetOffset(elementType, this.FirstVertex);
GLBuffer.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, indexBuffer.BufferId);
switch (controlMode)
{
case ControlMode.ByFrame:
if (instanceCount == 1)
{
if (frameCount == 1)
{
GL.Instance.DrawElements(mode, vertexCount, (uint)elementType, offset);
}
else
{
glDrawElementsBaseVertex(mode, vertexCount, (uint)elementType, offset, this.CurrentFrame * vertexCount);
}
}
else
{
if (frameCount == 1)
{
glDrawElementsInstanced(mode, vertexCount, (uint)elementType, offset, instanceCount);
}
else
{
glDrawElementsInstancedBaseVertex(mode, vertexCount, (uint)elementType, offset, instanceCount, this.CurrentFrame * vertexCount);
}
}
break;
case ControlMode.Random:
if (instanceCount == 1)
{
if (frameCount == 1)
{
GL.Instance.DrawElements(mode, this.RenderingVertexCount, (uint)elementType, offset);
}
else
{
glDrawElementsBaseVertex(mode, this.RenderingVertexCount, (uint)elementType, offset, this.CurrentFrame * vertexCount);
}
}
else
{
if (frameCount == 1)
{
glDrawElementsInstanced(mode, this.RenderingVertexCount, (uint)elementType, offset, instanceCount);
}
else
{
glDrawElementsInstancedBaseVertex(mode, this.RenderingVertexCount, (uint)elementType, offset, instanceCount, this.CurrentFrame * vertexCount);
}
}
break;
default:
throw new NotDealWithNewEnumItemException(typeof(ControlMode));
}
GLBuffer.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, 0);
}