/// <summary>
///
/// </summary>
/// <param name="indexAccessMode">index buffer is accessable randomly or only by frame.</param>
/// <param name="transformFeedbackObj"></param>
public void Render(IndexAccessMode indexAccessMode, TransformFeedbackObject transformFeedbackObj)
{
ShaderProgram program = this.Program;
GLSwitchList switchList = this.SwitchList;
// 绑定shader
program.Bind();
program.PushUniforms(); // push new uniform values to GPU side.
switchList.On();
if (transformFeedbackObj != null)
{
transformFeedbackObj.Bind();
foreach (var vao in this.VertexArrayObjects)
{
transformFeedbackObj.Begin(vao.DrawCommand.Mode);
vao.Draw(indexAccessMode);
transformFeedbackObj.End();
}
transformFeedbackObj.Unbind();
}
else
{
foreach (var vao in this.VertexArrayObjects)
{
vao.Draw(indexAccessMode);
}
}
switchList.Off();
// 解绑shader
program.Unbind();
}
/// <summary>
///
/// </summary>
/// <param name="program"></param>
/// <param name="vaos"></param>
/// <param name="switchList"></param>
public void Draw(ShaderProgram program, VertexArrayObject[] vaos, GLSwitchList switchList = null)
{
// 绑定shader
program.Bind();
program.PushUniforms(); // push new uniform values to GPU side.
if (switchList != null)
{
switchList.On();
}
this.Bind();
foreach (var vao in vaos)
{
DrawMode mode = vao.DrawCommand.CurrentMode;
this.Begin(mode);
vao.Bind();
this.Draw(mode);
vao.Unbind();
this.End();
}
this.Unbind();
if (switchList != null)
{
switchList.Off();
}
// 解绑shader
program.Unbind();
}
/// <summary>
/// A smallest unit that can render somthing.
/// </summary>
/// <param name="program"></param>
/// <param name="vaos"></param>
/// <param name="switches"></param>
public RenderMethod(ShaderProgram program, VertexArrayObject[] vaos, params GLSwitch[] switches)
{
this.Program = program;
this.VertexArrayObjects = vaos;
this.SwitchList = new GLSwitchList();
this.SwitchList.AddRange(switches);
}