private void SetupShadowShader(DrawState state)
{
ICamera shadowCamera = this.shadowMapTarget.Camera;
//compute the view*projection matrix for the shadow map camera...
Matrix view, projection, viewProjection;
shadowCamera.GetViewMatrix(out view);
shadowCamera.GetProjectionMatrix(out projection, this.shadowMapTarget.Size);
Matrix.Multiply(ref view, ref projection, out viewProjection);
//and the view direction
Vector3 viewDirection;
shadowCamera.GetCameraViewDirection(out viewDirection);
//set the matrix and other constants in the shadow mapping shader instances
Shader.ShadowShader shader = state.GetShader <Shader.ShadowShader>();
Shader.ShadowShaderBlend shaderBlend = state.GetShader <Shader.ShadowShaderBlend>();
//non-blending shader
shader.ShadowMap = this.shadowMapTarget.GetTexture();
shader.SetShadowMapProjection(ref viewProjection);
shader.SetShadowViewDirection(ref viewDirection);
//setup the same constants for the blending shader
shaderBlend.ShadowMap = this.shadowMapTarget.GetTexture();
shaderBlend.SetShadowMapProjection(ref viewProjection);
shaderBlend.SetShadowViewDirection(ref viewDirection);
}
//this is called just before geometry is drawn,
//return true to indicate the shader has been set
public override bool BeginGeometryShaderOverride(DrawState state, GeometryData geometry, Xen.Ex.Material.MaterialLightCollection lights)
{
//query the draw flag,
switch (state.GetDrawFlag <TutorialRenderMode>())
{
case TutorialRenderMode.DrawShadow:
{
//bind the shadow rendering shader...
if (animationBoneData == null)
{
Shader.ShadowShader shader = state.GetShader <Shader.ShadowShader>();
shader.TextureMap = geometry.MaterialShader.TextureMap;
shader.TextureSampler = geometry.MaterialShader.TextureMapSampler;
shader.Bind(state);
}
else
{
//bind the animating shader,
Shader.ShadowShaderBlend shader = state.GetShader <Shader.ShadowShaderBlend>();
//set the blend matrix data
if (animationBoneDataDirty)
{
//use the 'animationBoneDataDirty' bool so animation data is only copied once.
//this could happen if a single model has many pieces of geometry.
shader.SetBlendMatrices(animationBoneData);
animationBoneDataDirty = false;
}
shader.TextureMap = geometry.MaterialShader.TextureMap;
shader.TextureSampler = geometry.MaterialShader.TextureMapSampler;
shader.Bind(state);
}
return(true); //shader was assigned
}
case TutorialRenderMode.DepthOutput:
{
//determine if alpha test is being used (in this tutorial it won't be - but do it anyway...)
bool alphaTest = state.RenderState.AlphaTest.Enabled;
if (alphaTest)
{
//alpha test is only needed if a texture is set
alphaTest &= geometry.MaterialShader.TextureMap != null;
}
if (alphaTest)
{
//bind a depth output shader that samples a texture for alpha (for alpha test compatibility)
if (this.animationBoneData != null)
{
//the model is animated
//get the shader
Xen.Ex.Shaders.NonLinearDepthOutRgTextureAlphaBlend shader = state.GetShader <Xen.Ex.Shaders.NonLinearDepthOutRgTextureAlphaBlend>();
//set animation data (it's possible this is called redundantly, so logic here could be improved)
if (animationBoneDataDirty)
{
shader.SetBlendMatrices(this.animationBoneData);
animationBoneDataDirty = false;
}
//set the texture
shader.AlphaTexture = geometry.MaterialShader.TextureMap;
shader.AlphaTextureSampler = geometry.MaterialShader.TextureMapSampler;
//bind
shader.Bind(state);
}
else
{
//get the shader
Xen.Ex.Shaders.NonLinearDepthOutRgTextureAlpha shader = state.GetShader <Xen.Ex.Shaders.NonLinearDepthOutRgTextureAlpha>();
//set the texture
shader.AlphaTexture = geometry.MaterialShader.TextureMap;
shader.AlphaTextureSampler = geometry.MaterialShader.TextureMapSampler;
shader.Bind(state); // bind the basic depth out shader
}
}
else
{
//bind a simple depth output shader
if (this.animationBoneData != null)
{
//the model is animated
Xen.Ex.Shaders.NonLinearDepthOutRgBlend shader = state.GetShader <Xen.Ex.Shaders.NonLinearDepthOutRgBlend>();
//set animation data (it's possible this is called redundantly, so logic here could be improved)
if (animationBoneDataDirty)
{
shader.SetBlendMatrices(this.animationBoneData);
animationBoneDataDirty = false;
}
//bind
shader.Bind(state);
}
else
{
state.GetShader <Xen.Ex.Shaders.NonLinearDepthOutRg>().Bind(state); // bind the basic depth out shader
}
}
return(true); //shader was assigned
}
}
//false, because no shader has been bound (will use the model material shader)
return(false);
}
