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/* open shading language, only for CPU device */		/* open shading language, only for CPU device */
virtual void *osl_memory() { return NULL; }		virtual void *osl_memory() { return NULL; }

/* load/compile kernels, must be called before adding tasks */		/* load/compile kernels, must be called before adding tasks */
virtual bool load_kernels(bool experimental) { return true; }		virtual bool load_kernels(bool experimental) { return true; }

/* tasks */		/* tasks */
		virtual int task_count(DeviceTask& task) = 0;
		sergeyUnsubmitted Not Done Inline Actions Naming suggestion: `get_split_task_count()` sergey: Naming suggestion: `get_split_task_count()`
virtual void task_add(DeviceTask& task) = 0;		virtual void task_add(DeviceTask& task) = 0;
virtual void task_wait() = 0;		virtual void task_wait() = 0;
virtual void task_cancel() = 0;		virtual void task_cancel() = 0;

/* opengl drawing */		/* opengl drawing */
virtual void draw_pixels(device_memory& mem, int y, int w, int h,		virtual void draw_pixels(device_memory& mem, int y, int w, int h,
int dy, int width, int height, bool transparent,		int dy, int width, int height, bool transparent,
const DeviceDrawParams &draw_params);		const DeviceDrawParams &draw_params);
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