/// <summary>
/// Enables the GL.BlendFunc parameter
/// </summary>
/// <param name="type"></param>
/// <param name="stateHandle"></param>
private static void EnableBlendFunc(D3DRENDERSTATETYPE type, MaterialShader.RenderStateHandle stateHandle)
{
var other = type == D3DRENDERSTATETYPE.SRCBLEND ? D3DRENDERSTATETYPE.DESTBLEND : D3DRENDERSTATETYPE.SRCBLEND;
int value = CurrentState.TryGetValue(other, out value)
? value
: 0;
var otherBlend = ( D3DBLEND )value;
var blend = ( D3DBLEND )stateHandle.UnionValue;
if (other == D3DRENDERSTATETYPE.SRCBLEND)
{
GL.BlendFunc(otherBlend.ConvertToBlendingFactorSrc( ), blend.ConvertToBlendingFactorDest( ));
}
else
{
GL.BlendFunc(blend.ConvertToBlendingFactorSrc( ), otherBlend.ConvertToBlendingFactorDest( ));
}
}
/// <summary>
/// Handles dispatching state changes for updating
/// </summary>
/// <param name="stateHandle"></param>
public static void DispatchState(MaterialShader.RenderStateHandle stateHandle)
{
// Quit early if updating is pointless
if (CurrentState.ContainsKey(stateHandle.RenderState) &&
CurrentState[stateHandle.RenderState] == stateHandle.UnionValue)
{
return;
}
switch (stateHandle.RenderState)
{
case D3DRENDERSTATETYPE.ALPHATESTENABLE:
{
var enable = stateHandle.UnionValue > 0;
AlphaTestEnableChanged?.Invoke(null, enable);
}
break;
case D3DRENDERSTATETYPE.ALPHAFUNC:
{
var function = ( D3DCMPFUNC )stateHandle.UnionValue;
AlphaFuncChanged?.Invoke(null, function);
}
break;
case D3DRENDERSTATETYPE.ALPHAREF:
{
var alphaReference = ( float )stateHandle.UnionValue / byte.MaxValue;
AlphaRefChanged?.Invoke(null, alphaReference);
}
break;
case D3DRENDERSTATETYPE.COLORWRITEENABLE:
{
var writeMask = new ColourWriteMask(stateHandle.UnionValue);
GL.ColorMask(writeMask.R, writeMask.G, writeMask.B, writeMask.A);
}
break;
case D3DRENDERSTATETYPE.ALPHABLENDENABLE:
{
var enable = stateHandle.UnionValue > 0;
if (enable)
{
GL.Enable(EnableCap.Blend);
}
else
{
GL.Disable(EnableCap.Blend);
}
AlphaBlendEnableChanged?.Invoke(null, enable);
}
break;
case D3DRENDERSTATETYPE.DESTBLEND:
{
EnableBlendFunc(D3DRENDERSTATETYPE.DESTBLEND, stateHandle);
}
break;
case D3DRENDERSTATETYPE.SRCBLEND:
{
EnableBlendFunc(D3DRENDERSTATETYPE.SRCBLEND, stateHandle);
}
break;
case D3DRENDERSTATETYPE.BLENDOP:
{
var blendOp = ( D3DBLENDOP )stateHandle.UnionValue;
var blendEquation = blendOp.ConvertToBlendEquation( );
GL.BlendEquation(blendEquation);
}
break;
case D3DRENDERSTATETYPE.ZWRITEENABLE:
{
//var enable = stateHandle.unionValue > 0;
//GL.DepthMask( enable );
}
break;
case D3DRENDERSTATETYPE.CULLMODE:
{
var value = ( D3DCULL )stateHandle.UnionValue;
var cullMode = value.ConvertCullMode( );
GL.Enable(EnableCap.CullFace);
GL.CullFace(cullMode);
}
break;
default:
{
}
break;
}
// Update the current states
CurrentState[stateHandle.RenderState] = stateHandle.UnionValue;
}
