private void RenderShadowMap(out XMFloat4X4 mViewProjLight, out XMFloat3 vLightDir)
{
var context = this.deviceResources.D3DContext;
D3D11Rect[] oldRects = context.RasterizerStageGetScissorRects();
D3D11Viewport[] oldVp = context.RasterizerStageGetViewports();
D3D11Rect[] rects = new D3D11Rect[1] {
new D3D11Rect(0, (int)g_fShadowMapWidth, 0, (int)g_fShadowMapHeight)
};
context.RasterizerStageSetScissorRects(rects);
D3D11Viewport[] vp = new D3D11Viewport[1] {
new D3D11Viewport(0, 0, g_fShadowMapWidth, g_fShadowMapHeight, 0.0f, 1.0f)
};
context.RasterizerStageSetViewports(vp);
// Set our scene render target & keep original depth buffer
D3D11RenderTargetView[] pRTVs = new D3D11RenderTargetView[2];
context.OutputMergerSetRenderTargets(pRTVs, this.g_pDepthStencilTextureDSV);
// Clear the render target
context.ClearDepthStencilView(this.g_pDepthStencilTextureDSV, D3D11ClearOptions.Depth | D3D11ClearOptions.Stencil, 1.0f, 0);
// Get the projection & view matrix from the camera class
XMFloat3 up = new XMFloat3(0, 1, 0);
XMFloat4 vLight = new XMFloat4(0.0f, 0.0f, 0.0f, 1.0f);
XMFloat4 vLightLookAt = new XMFloat4(0.0f, -0.5f, 1.0f, 0.0f);
vLightLookAt = vLight.ToVector() + vLightLookAt.ToVector();
vLight = XMVector4.Transform(vLight, this.LightWorldMatrix);
vLightLookAt = XMVector4.Transform(vLightLookAt, this.LightWorldMatrix);
vLightDir = XMVector.Subtract(vLightLookAt, vLight);
XMMatrix mProj = XMMatrix.OrthographicOffCenterLH(-8.5f, 9, -15, 11, -20, 20);
XMMatrix mView = XMMatrix.LookAtLH(vLight, vLightLookAt, up);
mViewProjLight = mView * mProj;
// Setup the constant buffer for the scene vertex shader
ConstantBufferConstants pConstants = new ConstantBufferConstants
{
WorldViewProjection = mViewProjLight.ToMatrix().Transpose(),
WorldViewProjLight = mViewProjLight.ToMatrix().Transpose(),
ShadowMapDimensions = new XMFloat4(
g_fShadowMapWidth,
g_fShadowMapHeight,
1.0f / g_fShadowMapWidth,
1.0f / g_fShadowMapHeight),
LightDir = new XMFloat4(vLightDir.X, vLightDir.Y, vLightDir.Z, 0.0f),
SunWidth = this.SunWidth
};
context.UpdateSubresource(this.g_pcbConstants, 0, null, pConstants, 0, 0);
context.VertexShaderSetConstantBuffers(g_iConstantsConstantBufferBind, new[] { this.g_pcbConstants });
context.PixelShaderSetConstantBuffers(g_iConstantsConstantBufferBind, new[] { this.g_pcbConstants });
// Set the shaders
context.VertexShaderSetShader(this.g_pShadowMapVS, null);
context.PixelShaderSetShader(null, null);
// Set the vertex buffer format
context.InputAssemblerSetInputLayout(this.g_pSceneVertexLayout);
// Render the scene
this.g_Poles.Render(0, -1, -1);
// reset the old viewport etc.
context.RasterizerStageSetScissorRects(oldRects);
context.RasterizerStageSetViewports(oldVp);
}