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/* Checks whether the shader consists of just a emission node with fixed inputs that's connected directly to the output.		/* Checks whether the shader consists of just a emission node with fixed inputs that's connected directly to the output.
* If yes, it sets the content of emission to the constant value (color * strength), which is then used for speeding up light evaluation. */		* If yes, it sets the content of emission to the constant value (color * strength), which is then used for speeding up light evaluation. */
bool is_constant_emission(float3* emission);		bool is_constant_emission(float3* emission);

void set_graph(ShaderGraph *graph);		void set_graph(ShaderGraph *graph);
void tag_update(Scene *scene);		void tag_update(Scene *scene);
void tag_used(Scene *scene);		void tag_used(Scene *scene);

		void update_attributes(Scene *scene);
};		};

/* Shader Manager virtual base class		/* Shader Manager virtual base class
*		*
* From this the SVM and OSL shader managers are derived, that do the actual		* From this the SVM and OSL shader managers are derived, that do the actual
* shader compiling and device updating. */		* shader compiling and device updating. */

class ShaderManager {		class ShaderManager {
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