/// <summary>
/// Begins the G-Buffer render.
/// </summary>
internal static void Begin(Size size)
{
try
{
// Multisampling on normal and depth maps makes no physical sense!!
// Except MSAA is controled like was proposed in the ShaderX7 article.
// The problem is that the available hardware does not support this technique.
// The depth texture has a surface format of 32 bits single channel precision. Equation: -DepthVS / FarPlane
// The normals are store using best fit normals for maximum compression (24 bits), and are stored in view space,
// but best fit normals works better in world space, this is specially noticed in the presence of big triangles.
// The specular power is stored in 8 bits following Killzone 2 method.
// There is room in the depth surface to store a mask for ambient lighting (Crysis 2 and Toy Story 3 method).
renderTargetBinding = RenderTarget.Fetch(size, SurfaceFormat.Single, DepthFormat.Depth24, SurfaceFormat.Color);
// Set Render States.
EngineManager.Device.BlendState = BlendState.Opaque;
EngineManager.Device.RasterizerState = RasterizerState.CullCounterClockwise;
EngineManager.Device.DepthStencilState = DepthStencilState.Default;
// If I set the sampler states here and no texture is set then this could produce exceptions
// because another texture from another shader could have an incorrect sampler state when this shader is executed.
// With multiple render targets the GBuffer performance can be vastly improved.
RenderTarget.EnableRenderTargets(renderTargetBinding);
RenderTarget.ClearCurrentRenderTargets(Color.White);
}
catch (Exception e)
{
throw new InvalidOperationException("GBuffer Pass: Unable to begin the rendering.", e);
}
} // Begin
/// <summary>
/// Begins the G-Buffer render.
/// </summary>
internal static void Begin(Size size)
{
try
{
renderTargetBinding = RenderTarget.Fetch(size, SurfaceFormat.HdrBlendable, DepthFormat.Depth24Stencil8, SurfaceFormat.HdrBlendable);
RenderTarget.EnableRenderTargets(renderTargetBinding);
RenderTarget.ClearCurrentRenderTargets(new Color(0, 0, 0, 0));
} // try
catch (Exception e)
{
throw new InvalidOperationException("Light Pre Pass: Unable to begin the rendering.", e);
}
} // Begin
/// <summary>
/// Begins the G-Buffer render.
/// </summary>
internal static void Begin(Size size, Color clearColor)
{
try
{
sceneTexture = RenderTarget.Fetch(size, SurfaceFormat.HdrBlendable, DepthFormat.Depth24, RenderTarget.AntialiasingType.NoAntialiasing);
sceneTexture.EnableRenderTarget();
RenderTarget.ClearCurrentRenderTargets(clearColor);
}
catch (Exception e)
{
throw new InvalidOperationException("Scene Pass: Unable to begin the rendering.", e);
}
} // Begin
} // GetParameters
#endregion
#region Combine
/// <summary>
/// Combine depth and normals (foliage and opaque) for shadows (locals and global)
/// </summary>
internal RenderTarget.RenderTargetBinding Render(RenderTarget depthOpaqueTexture, RenderTarget depthFoliageTexture,
RenderTarget normalOpaqueTexture, RenderTarget normalFoliageTexture)
{
try
{
EngineManager.Device.BlendState = BlendState.Opaque;
EngineManager.Device.DepthStencilState = DepthStencilState.None;
EngineManager.Device.RasterizerState = RasterizerState.CullCounterClockwise;
SetHalfPixel(new Vector2(-1f / depthOpaqueTexture.Width, 1f / depthOpaqueTexture.Height));
SetDepthFoliageTexture(depthFoliageTexture);
SetDepthOpaqueTexture(depthOpaqueTexture);
SetNormalsFoliageTexture(normalFoliageTexture);
SetNormalsOpaqueTexture(normalOpaqueTexture);
RenderTarget.RenderTargetBinding renderTargetBinding = RenderTarget.Fetch(depthOpaqueTexture.Size,
depthOpaqueTexture.SurfaceFormat,
DepthFormat.None,
normalOpaqueTexture.SurfaceFormat);
// With multiple render targets the performance can be improved.
RenderTarget.EnableRenderTargets(renderTargetBinding);
RenderTarget.ClearCurrentRenderTargets(Color.White);
// Start effect (current technique should be set));
Resource.CurrentTechnique = Resource.Techniques["CombineDepthNormals"];
Resource.CurrentTechnique.Passes[0].Apply();
RenderScreenPlane();
RenderTarget.DisableCurrentRenderTargets();
return(renderTargetBinding);
}
catch (Exception e)
{
throw new InvalidOperationException("Combine Depth and Normals Shader: Unable to render.", e);
}
} // Render
