public static extern void FNA3D_SetBlendState(
IntPtr device,
ref FNA3D_BlendState blendState
);
//
// FNA3D_SetBlendState
//
public static void FNA3D_SetBlendState(IntPtr device, ref FNA3D_BlendState blendState)
{
var input = blendState;
var renderer = Renderer.Get(device);
Renderer.Get(device).Send(false, () =>
{
var state = (State)renderer.UserData;
if (input.colorSourceBlend != Blend.One ||
input.colorDestinationBlend != Blend.Zero ||
input.alphaSourceBlend != Blend.One ||
input.alphaDestinationBlend != Blend.Zero)
{
//
// blend state
//
if (!state.BlendEnable)
{
state.BlendEnable = true;
GLES20.glEnable(GLES20.GL_BLEND);
}
//
// XNA blend factor / GL blend color
//
if (input.blendFactor != state.BlendColor)
{
state.BlendColor = input.blendFactor;
GLES20.glBlendColor(state.BlendColor.R / 255f, state.BlendColor.G / 255f,
state.BlendColor.B / 255f, state.BlendColor.A / 255f);
}
//
// XNA blend mode / GL blend function
//
if (input.colorSourceBlend != state.BlendSrcColor ||
input.colorDestinationBlend != state.BlendDstColor ||
input.alphaSourceBlend != state.BlendSrcAlpha ||
input.alphaDestinationBlend != state.BlendDstAlpha)
{
state.BlendSrcColor = input.colorSourceBlend;
state.BlendDstColor = input.colorDestinationBlend;
state.BlendSrcAlpha = input.alphaSourceBlend;
state.BlendDstAlpha = input.alphaDestinationBlend;
GLES20.glBlendFuncSeparate(
BlendModeToBlendFunc[(int)state.BlendSrcColor],
BlendModeToBlendFunc[(int)state.BlendDstColor],
BlendModeToBlendFunc[(int)state.BlendSrcAlpha],
BlendModeToBlendFunc[(int)state.BlendDstAlpha]);
}
//
// XNA blend function / GL blend equation
//
if (input.colorBlendFunction != state.BlendFuncColor ||
input.alphaBlendFunction != state.BlendFuncAlpha)
{
state.BlendFuncColor = input.colorBlendFunction;
state.BlendFuncAlpha = input.alphaBlendFunction;
GLES20.glBlendEquationSeparate(
BlendFunctionToBlendEquation[(int)state.BlendFuncColor],
BlendFunctionToBlendEquation[(int)state.BlendFuncAlpha]);
}
//
// color write mask
//
bool inputRed = ((input.colorWriteEnable & ColorWriteChannels.Red) != 0);
bool inputGreen = ((input.colorWriteEnable & ColorWriteChannels.Green) != 0);
bool inputBlue = ((input.colorWriteEnable & ColorWriteChannels.Blue) != 0);
bool inputAlpha = ((input.colorWriteEnable & ColorWriteChannels.Alpha) != 0);
var WriteMask = state.WriteMask;
if (inputRed != ((WriteMask & RED_MASK) != 0) ||
inputGreen != ((WriteMask & GREEN_MASK) != 0) ||
inputBlue != ((WriteMask & BLUE_MASK) != 0) ||
inputAlpha != ((WriteMask & ALPHA_MASK) != 0))
{
state.WriteMask = (inputRed ? RED_MASK : 0)
| (inputGreen ? GREEN_MASK : 0)
| (inputBlue ? BLUE_MASK : 0)
| (inputAlpha ? ALPHA_MASK : 0);
GLES20.glColorMask(inputRed, inputGreen, inputBlue, inputAlpha);
}
}
else
{
state.BlendEnable = false;
GLES20.glDisable(GLES20.GL_BLEND);
}
});
}
