Differential D3592 Diff 11529 intern/cycles/kernel/closure/bsdf_util.h

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	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.			* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/			*/

	#ifndef __BSDF_UTIL_H__			#ifndef __BSDF_UTIL_H__
	#define __BSDF_UTIL_H__			#define __BSDF_UTIL_H__

	CCL_NAMESPACE_BEGIN			CCL_NAMESPACE_BEGIN

				ccl_device bool refract_dielectric(
				float eta, const float3 N, const float3 I,
				#ifdef __RAY_DIFFERENTIALS__
				const float3 dIdx, const float3 dIdy,
				float3 dTdx, float3 dTdy,
				#endif
				float3 *T)
				{
				float cosNI = dot(N, I);
				if(cosNI <= 0.0f) {
				return false;
				}

				float neta = 1.0f / eta;

				float arg = 1.0f - (sqr(neta) * (1.0f - sqr(cosNI)));
				if(arg <= 0) {
				return false;
				}

				float dnp = max(sqrtf(arg), 1e-7f);
				float nK = (neta * cosNI) - dnp;
				T = (nK N) - (neta * I);
				#ifdef __RAY_DIFFERENTIALS__
				float fac = neta * (1.0f - neta * cosNI / dnp);
				dTdx = (fac dot(dIdx, N)) * N - neta * dIdx;
				dTdy = (fac dot(dIdy, N)) * N - neta * dIdy;
				#endif
				return true;
				}

	ccl_device float fresnel_dielectric(			ccl_device float fresnel_dielectric(
	float eta, const float3 N,			float eta, const float3 N,
	const float3 I, float3 R, float3 T,			const float3 I, float3 R, float3 T,
	#ifdef __RAY_DIFFERENTIALS__			#ifdef __RAY_DIFFERENTIALS__
	const float3 dIdx, const float3 dIdy,			const float3 dIdx, const float3 dIdy,
	float3 dRdx, float3 dRdy,			float3 dRdx, float3 dRdy,
	float3 dTdx, float3 dTdy,			float3 dTdx, float3 dTdy,
	#endif			#endif
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