/// <summary>
/// Function to build up the render targets.
/// </summary>
/// <param name="width">The width of the render targets.</param>
/// <param name="height">The height of the render targets.</param>
/// <param name="format">The format of the buffer.</param>
private void BuildRenderTargets(int width, int height, BufferFormat format)
{
// For the lighting effect, we use a deferred rendering technique where we have 3 render targets for diffuse, specularity, and normal mapping.
// These targets are sub resources of the same texture resource (array indices).
// Diffuse.
_rtvInfo.Width = width;
_rtvInfo.Height = height;
_rtvInfo.Format = format;
_rtvInfo.ArrayCount = 2;
_gbufferTargets[0] = Graphics.TemporaryTargets.Rent(_rtvInfo, "Gorgon 2D GBuffer - Diffuse/Specular", false);
_gbufferTargets[0].Clear(GorgonColor.Black);
// Specular.
_gbufferTargets[1] = _gbufferTargets[0].Texture.GetRenderTargetView(arrayIndex: 1, arrayCount: 1);
_rtvInfo.Format = BufferFormat.R8G8B8A8_UNorm;
_rtvInfo.ArrayCount = 1;
// Normals.
// We'll clear it before the pass, the default color is insufficient.
_gbufferTargets[2] = Graphics.TemporaryTargets.Rent(_rtvInfo, "Gorgon 2D Buffer - Normals", false);
GorgonTexture2DView normalSrv = _gbufferTargets[2].GetShaderResourceView();
if ((_pixelLitShaderState.ShaderResources[1] != normalSrv) ||
(_diffuseFilter != DiffuseFiltering) ||
(_normalFilter != NormalFiltering) ||
(_specularFilter != SpecularFiltering))
{
_diffuseFilter = DiffuseFiltering ?? GorgonSamplerState.Default;
_normalFilter = NormalFiltering ?? GorgonSamplerState.PointFiltering;
_specularFilter = SpecularFiltering ?? GorgonSamplerState.Default;
_pixelDeferShaderState = PixelShaderBuilder.ResetTo(_pixelDeferShaderState)
.SamplerState(_diffuseFilter, 0)
.SamplerState(_normalFilter, 1)
.SamplerState(_specularFilter, 2)
.Build();
_pixelLitShaderState = PixelShaderBuilder
.ResetTo(_pixelLitShaderState)
.ShaderResource(normalSrv, 1)
.SamplerState(_diffuseFilter, 0)
.SamplerState(_normalFilter, 1)
.SamplerState(_specularFilter, 2)
.Build();
_lightingState = BatchStateBuilder
.ResetTo(_lightingState)
.PixelShaderState(_pixelLitShaderState)
.Build();
}
_gbufferTexture = _gbufferTargets[0].Texture.GetShaderResourceView();
}
