/// <summary> Called before Render (normally by RenderList::Render) to set up data for the render.
/// currentstate may be null, meaning, don't apply
/// RenderState may be null, meaning don't change</summary>
public void Bind(GLRenderState currentstate, IGLProgramShader shader, GLMatrixCalc matrixcalc)
{
if (currentstate != null && RenderState != null) // if either null, it means the last render state applied is the same as our render state, so no need to apply
{
currentstate.ApplyState(RenderState); // else go to this state
}
VertexArray?.Bind(); // give the VA a chance to bind to GL
RenderData?.Bind(this, shader, matrixcalc); // optional render data supplied by the user to bind
ElementBuffer?.BindElement(); // if we have an element buffer, give it a chance to bind
IndirectBuffer?.BindIndirect(); // if we have an indirect buffer, give it a chance to bind
ParameterBuffer?.BindParameter(); // if we have a parameter buffer, give it a chance to bind
}
/// <summary> Called by WinFormControl, this sets up the initial render state </summary>
static public GLRenderState Start()
{
var startstate = new GLRenderState() // Set the default state we want to be in at start (some state defaults are at bottom)
{
FrontFace = FrontFaceDirection.Ccw,
CullFace = true,
PolygonModeFrontAndBack = PolygonMode.Fill,
PatchSize = 1,
PointSize = 1,
PointSprite = false,
PointSmooth = true,
PolygonSmooth = false,
LineWidth = 1,
LineSmooth = true,
};
var curstate = new GLRenderState() // set to be purposely not default constructor state and the above state
{ // to make all get set.
PrimitiveRestart = 1,
ClipDistanceEnable = 1,
DepthTest = false,
DepthFunctionMode = DepthFunction.Never,
WriteDepthBuffer = false,
DepthClamp = true,
BlendEnable = false,
BlendSourceRGB = BlendingFactorSrc.ConstantAlpha,
BlendSourceA = BlendingFactorSrc.ConstantAlpha,
BlendDestRGB = BlendingFactorDest.ConstantAlpha,
BlendDestA = BlendingFactorDest.ConstantAlpha,
BlendEquationA = BlendEquationMode.Min,
BlendEquationRGB = BlendEquationMode.Min,
ColorMasking = 0,
Discard = true,
};
curstate.ApplyState(startstate); // from curstate, apply state
return(startstate);
}