private void BuildGraphicsResources()
{
VertexPosition2Texture[] fullscreenQuadVertices =
{
new VertexPosition2Texture(new Vector2(-1.0f, 1.0f), new Vector2(0.0f, 0.0f)),
new VertexPosition2Texture(new Vector2(3.0f, 1.0f), new Vector2(2.0f, 0.0f)),
new VertexPosition2Texture(new Vector2(-1.0f, -3.0f), new Vector2(0.0f, 2.0f))
};
_fullscreenQuadVao = StaticVao.New(_engine.Device, fullscreenQuadVertices, VertexPosition2Texture.Layout, PrimitiveType.TriangleStrip);
}
private void BuildGraphicsResources()
{
// We build the quad a little larger than required in order to be able to also properly clear the alpha
// for the region. The reason we need larger quad is due to camera rotation.
var d = (float)(1 / Math.Sqrt(2));
// Quad.
VertexPosition2Texture[] quadVertices =
{
new VertexPosition2Texture(new Vector2(0.0f - d, 1.0f + d), new Vector2(0.0f - d, 0.0f - d)),
new VertexPosition2Texture(new Vector2(1.0f + d, 1.0f + d), new Vector2(1.0f + d, 0.0f - d)),
new VertexPosition2Texture(new Vector2(0.0f - d, 0.0f - d), new Vector2(0.0f - d, 1.0f + d)),
new VertexPosition2Texture(new Vector2(1.0f + d, 0.0f - d), new Vector2(1.0f + d, 1.0f + d))
};
_quadVao = StaticVao.New(_engine.Device, quadVertices, VertexPosition2Texture.Layout, PrimitiveType.TriangleStrip);
// Circle.
const int circlePoints = 12;
const float radius = 1.0f;
const float rotationIncrement = MathHelper.TwoPi / circlePoints;
var vertices = new VertexPosition2Texture[circlePoints + 1];
var indices = new int[circlePoints * 3];
var center = new VertexPosition2Texture(Vector2.Zero, Vector2.One);
vertices[0] = center;
for (int i = 1; i <= circlePoints; i++)
{
var angle = rotationIncrement * i;
vertices[i] = new VertexPosition2Texture(new Vector2((float)Math.Cos(angle) * radius, (float)Math.Sin(angle) * radius), Vector2.Zero);
int indexStart = (i - 1) * 3;
indices[indexStart++] = 0;
indices[indexStart++] = i;
indices[indexStart] = i + 1;
}
indices[indices.Length - 1] = 1;
_circleVao = StaticVao.New(_engine.Device, vertices, VertexPosition2Texture.Layout, PrimitiveType.TriangleList, indices);
// Render states.
_bsLight = new BlendState
{
ColorBlendFunction = BlendFunction.Add,
ColorSourceBlend = Blend.DestinationAlpha,
ColorDestinationBlend = Blend.One,
//ColorDestinationBlend = Blend.InverseSourceColor, // Blends lights a little softer.
ColorWriteChannels = ColorWriteChannels.All,
AlphaBlendFunction = BlendFunction.Add,
AlphaSourceBlend = Blend.One,
AlphaDestinationBlend = Blend.Zero
};
_dssOccludedLight = new DepthStencilState
{
DepthBufferEnable = false,
StencilEnable = true,
StencilWriteMask = 0xff,
StencilMask = 0x00,
StencilFunction = CompareFunction.Always,
StencilPass = StencilOperation.Zero
};
}