/// <summary>
///
/// </summary>
/// <param name="gameTime"></param>
public void RenderRadiance()
{
var sw = new Stopwatch();
Log.Message("Radiance capture...");
sw.Start();
using (new PixEvent("Capture Radiance")) {
var sun = SkySettings.SunGlowIntensity;
SkySettings.SunGlowIntensity = 0;
int index = 0;
foreach (var envLight in LightSet.EnvLights)
{
for (int i = 0; i < 6; i++)
{
ClearBuffers(radianceFrame);
var camera = new Camera();
camera.SetupCameraCubeFace(envLight.Position, (CubeFace)i, 0.125f, 5000);
// render g-buffer :
rs.SceneRenderer.RenderGBuffer(new GameTime(0, 0, 0), StereoEye.Mono, camera, radianceFrame, this, true);
// render sky :
rs.Sky.Render(camera, StereoEye.Mono, radianceFrame, SkySettings);
// render lights :
rs.LightRenderer.RenderLighting(StereoEye.Mono, camera, radianceFrame, this, rs.Sky.SkyCube);
// downsample captured frame to cube face.
rs.Filter.StretchRect4x4(Radiance.GetSurface(0, (CubeFace)i), radianceFrame.HdrBuffer, SamplerState.LinearClamp, true);
}
// prefilter cubemap :
rs.Filter.PrefilterEnvMap(Radiance);
RadianceCache.CopyFromRenderTargetCube(index, Radiance);
index++;
}
sw.Stop();
SkySettings.SunGlowIntensity = sun;
}
Log.Message("{0} light probes - {1} ms", LightSet.EnvLights.Count, sw.ElapsedMilliseconds);
}
/// <summary>
///
/// </summary>
/// <param name="dst"></param>
/// <param name="cubeSrc"></param>
/// <param name="sampleCount"></param>
public void PrefilterEnvMap(RenderTargetCube envMap)
{
SetDefaultRenderStates();
int width = envMap.Width / 2;
int height = envMap.Height / 2;
using (new PixEvent("PrefilterEnvMap")) {
var sides = new[] { ShaderFlags.PREFILTER_ENVMAP | ShaderFlags.POSX, ShaderFlags.PREFILTER_ENVMAP | ShaderFlags.NEGX,
ShaderFlags.PREFILTER_ENVMAP | ShaderFlags.POSY, ShaderFlags.PREFILTER_ENVMAP | ShaderFlags.NEGY,
ShaderFlags.PREFILTER_ENVMAP | ShaderFlags.POSZ, ShaderFlags.PREFILTER_ENVMAP | ShaderFlags.NEGZ };
// loop through mip levels from second to last specular mip level :
for (int mip = 1; mip < RenderSystem.EnvMapSpecularMipCount; mip++)
{
float roughness = (float)mip / (float)(RenderSystem.EnvMapSpecularMipCount - 1);
float step = 1.0f / width;
vectorCB.SetData(new Vector4(roughness, step, 0, 0));
for (int face = 0; face < 6; face++)
{
device.SetTargets(null, envMap.GetSurface(mip, (CubeFace)face));
device.SetViewport(0, 0, width, height);
device.PixelShaderConstants[0] = vectorCB;
device.PipelineState = factory[(int)sides[face]];
device.VertexShaderResources[0] = envMap.GetCubeShaderResource(mip - 1);
device.PixelShaderResources[0] = envMap.GetCubeShaderResource(mip - 1);
device.PixelShaderSamplers[0] = SamplerState.LinearWrap;
device.VertexShaderConstants[0] = matrixCB;
device.Draw(3, 0);
}
width /= 2;
height /= 2;
}
}
device.ResetStates();
}
