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lib/maxsdk70/include/ICompositeShader.h

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+//////////////////////////////////////////////////////////////////////////////
+//
+//		Composite Shader Interface
+//
+//		Created: 9/27/01 Cleve Ard
+//
+#ifndef	ICOMPOSITESHADERS_H
+#define ICOMPOSITESHADERS_H
+
+#include "iFnPub.h"
+
+// ISpecularCompositeShader is used to let a shader choose the manner
+// that it combines specular and diffuse lighting. The shader can use
+// any information in the RenderGlobalContext to make this decision.
+
+// Several shaders, include anisotropic, translucent, and multilayer
+// combine specular and diffuse lighting using this equation:
+//   L = specular + (1 - specular) * diffuse
+// This only works when 0 <= specular <= 1. These shaders use this
+// interface to determine whether we are rendering with a tone operator.
+// If the render is using a tone operator, then the specular and diffuse
+// lighting is simply added for the total lighting.
+
+// In order for a StdMtl2 to ask for and call this interface for a shader
+// it must return MTLREQ_PREPRO in it's LocalRequirements method.
+
+class ISpecularCompositeShader : public BaseInterface {
+public:
+
+	// Choose specular method
+	virtual void ChooseSpecularMethod(TimeValue t, RenderGlobalContext* rgc) = 0;
+};
+
+
+#define ISPECULAR_COMPOSITE_SHADER_ID Interface_ID(0x5e2117d0, 0x327e2f73)
+
+// Get the ISpecularCompositeShader method, if there is one.
+inline ISpecularCompositeShader* GetSpecularCompositeShader(InterfaceServer* s)
+{
+	return static_cast<ISpecularCompositeShader*>(s->GetInterface(
+		ISPECULAR_COMPOSITE_SHADER_ID));
+}
+
+// Choose the method for combining specular and diffuse lighting.
+inline void ChooseSpecularMethod(InterfaceServer* s, TimeValue t, RenderGlobalContext* rgc)
+{
+	ISpecularCompositeShader* scs = GetSpecularCompositeShader(s);
+	if (scs != NULL)
+		scs->ChooseSpecularMethod(t, rgc);
+}
+
+#endif