public void Initialize()
{
gbufferEffect = EffectLoader.Load(@"Graphics/Shaders/GBuffer.fx");
QuadVert[] verts = new QuadVert[6]
{
new QuadVert(-1, -1, 0),
new QuadVert(-1, 1, 0),
new QuadVert(1, 1, 0),
new QuadVert(1, 1, 0),
new QuadVert(1, -1, 0),
new QuadVert(-1, -1, 0)
};
vb = SharpDX.Toolkit.Graphics.Buffer.New <QuadVert>(context.Device, verts, BufferFlags.VertexBuffer);
LightQuadVertex[] lightVerts = new LightQuadVertex[6]
{
new LightQuadVertex(-1, -1, 0, 0, 1, 3),
new LightQuadVertex(-1, 1, 0, 0, 0, 2),
new LightQuadVertex(1, 1, 0, 1, 0, 1),
new LightQuadVertex(1, 1, 0, 1, 0, 1),
new LightQuadVertex(1, -1, 0, 1, 1, 0),
new LightQuadVertex(-1, -1, 0, 0, 1, 3)
};
lightVb = SharpDX.Toolkit.Graphics.Buffer.New <LightQuadVertex>(context.Device, lightVerts, BufferFlags.VertexBuffer);
}
public void PreProcess()
{
order = 2;
GraphicsDevice device = Engine.GraphicsContext.Device;
device.SetRasterizerState(device.RasterizerStates.CullNone);
device.SetBlendState(device.BlendStates.Default);
device.SetDepthStencilState(device.DepthStencilStates.None);
// compute transmittance texture T (line 1 in algorithm 4.1)
device.SetRenderTargets(transmittanceT);
device.SetViewport(new ViewportF(0, 0, TRANSMITTANCE_W, TRANSMITTANCE_H));
device.DrawQuad(transmittance);
// compute irradiance texture deltaE (line 2 in algorithm 4.1)
device.SetRenderTargets(deltaET);
device.SetViewport(new ViewportF(0, 0, SKY_W, SKY_H));
irradiance1.Parameters["transTex"].SetResource(transmittanceT);
device.DrawQuad(irradiance1);
//// compute single scattering texture deltaS (line 3 in algorithm 4.1)
//// Rayleigh and Mie separated in deltaSR + deltaSM
device.SetRenderTargets(deltaSRT, deltaSMT);
device.SetViewport(new ViewportF(0, 0, RES_MU_S * RES_NU, RES_MU));
device.SetVertexBuffer(vb);
device.SetVertexInputLayout(VertexInputLayout.FromBuffer(0, vb));
inscatter1.Parameters["_transTex"].SetResource(transmittanceT);
inscatter1.Parameters["_transSamp"].SetResource(device.SamplerStates.LinearClamp);
for (int layer = 0; layer < RES_R; layer++)
{
setLayer(inscatter1, layer);
inscatter1.CurrentTechnique.Passes[0].Apply();
device.Draw(PrimitiveType.TriangleList, 6);
}
// copy deltaE into irradiance texture E (line 4 in algorithm 4.1)
// really this just clears irradianceT
device.SetRenderTargets(irradianceT);
device.SetViewport(new ViewportF(0, 0, SKY_W, SKY_H));
copyIrradiance.Parameters["k"].SetValue(0f);
copyIrradiance.Parameters["deltaE"].SetResource(deltaET);
device.DrawQuad(copyIrradiance);
for (; order < 3; order++)
{
// copy deltaS into inscatter texture S (line 5 in algorithm 4.1)
device.SetRenderTargets(inscatterT);
device.SetViewport(new ViewportF(0, 0, RES_MU_S * RES_NU, RES_MU));
device.SetVertexBuffer(vb);
device.SetVertexInputLayout(VertexInputLayout.FromBuffer(0, vb));
copyInscatter1.Parameters["deltaSR"].SetResource(deltaSRT);
copyInscatter1.Parameters["deltaSM"].SetResource(deltaSMT);
for (int layer = 0; layer < RES_R; layer++)
{
setLayer(copyInscatter1, layer);
copyInscatter1.CurrentTechnique.Passes[0].Apply();
device.Draw(PrimitiveType.TriangleList, 6);
}
// compute deltaJ (line 7 in algorithm 4.1)
device.SetRenderTargets(deltaJT);
device.SetViewport(new ViewportF(0, 0, RES_MU_S * RES_NU, RES_MU));
device.SetVertexBuffer(vb);
device.SetVertexInputLayout(VertexInputLayout.FromBuffer(0, vb));
inscatterS.Parameters["first"].SetValue(order == 2 ? 1.0f : 0.0f);
inscatterS.Parameters["trans"].SetResource(transmittanceT);
inscatterS.Parameters["deltaE"].SetResource(deltaET);
inscatterS.Parameters["deltaSR"].SetResource(deltaSRT);
inscatterS.Parameters["deltaSM"].SetResource(deltaSMT);
for (int layer = 0; layer < RES_R; layer++)
{
setLayer(inscatterS, layer);
inscatterS.CurrentTechnique.Passes[0].Apply();
device.Draw(PrimitiveType.TriangleList, 6);
}
// compute deltaE (line 8 in algorithm 4.1)
device.SetRenderTargets(deltaET);
device.SetViewport(new ViewportF(0, 0, SKY_W, SKY_H));
irradianceN.Parameters["first"].SetValue(order == 2 ? 1.0f : 0.0f);
irradianceN.Parameters["deltaSR"].SetResource(deltaSRT);
irradianceN.Parameters["deltaSM"].SetResource(deltaSMT);
device.DrawQuad(irradianceN);
// compute deltaS (line 9 in algorithm 4.1)
device.SetRenderTargets(deltaSRT);
device.SetViewport(new ViewportF(0, 0, RES_MU_S * RES_NU, RES_MU));
device.SetVertexBuffer(vb);
device.SetVertexInputLayout(VertexInputLayout.FromBuffer(0, vb));
inscatterN.Parameters["trans"].SetResource(transmittanceT);
inscatterN.Parameters["deltaJ"].SetResource(deltaJT);
for (int layer = 0; layer < RES_R; layer++)
{
setLayer(inscatterN, layer);
inscatterN.CurrentTechnique.Passes[0].Apply();
device.Draw(PrimitiveType.TriangleList, 6);
}
device.SetBlendState(BlendState.New(device,
SharpDX.Direct3D11.BlendOption.One,
SharpDX.Direct3D11.BlendOption.One,
SharpDX.Direct3D11.BlendOperation.Add,
SharpDX.Direct3D11.BlendOption.One,
SharpDX.Direct3D11.BlendOption.One,
SharpDX.Direct3D11.BlendOperation.Add));
// add deltaE into irradiance texture E (line 10 in algorithm 4.1)
device.SetRenderTargets(irradianceT);
device.SetViewport(new ViewportF(0, 0, SKY_W, SKY_H));
copyIrradiance.Parameters["k"].SetValue(1.0f);
copyIrradiance.Parameters["deltaE"].SetResource(deltaET);
device.DrawQuad(copyIrradiance);
// add deltaS into inscatter texture S (line 11 in algorithm 4.1)
device.SetRenderTargets(inscatterT);
device.SetViewport(new ViewportF(0, 0, RES_MU_S * RES_NU, RES_MU));
device.SetVertexBuffer(vb);
device.SetVertexInputLayout(VertexInputLayout.FromBuffer(0, vb));
copyInscatterN.Parameters["deltaS"].SetResource(deltaSRT);
for (int layer = 0; layer < RES_R; layer++)
{
setLayer(copyInscatterN, layer);
copyInscatterN.CurrentTechnique.Passes[0].Apply();
device.Draw(PrimitiveType.TriangleList, 6);
}
device.SetBlendState(device.BlendStates.Opaque);
} // end multiple scattering loop
LightQuadVertex[] lightVerts = new LightQuadVertex[6]
{
new LightQuadVertex(-1, -1, 0, 0, 1, 3),
new LightQuadVertex(-1, 1, 0, 0, 0, 2),
new LightQuadVertex(1, 1, 0, 1, 0, 1),
new LightQuadVertex(1, 1, 0, 1, 0, 1),
new LightQuadVertex(1, -1, 0, 1, 1, 0),
new LightQuadVertex(-1, -1, 0, 0, 1, 3)
};
atmosVb = SharpDX.Toolkit.Graphics.Buffer.New <LightQuadVertex>(device, lightVerts, BufferFlags.VertexBuffer);
}