diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_jitter.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_jitter.h | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/intern/cycles/kernel/kernel_jitter.h b/intern/cycles/kernel/kernel_jitter.h deleted file mode 100644 index b62ec7fda42..00000000000 --- a/intern/cycles/kernel/kernel_jitter.h +++ /dev/null @@ -1,169 +0,0 @@ -/* - * Copyright 2011-2013 Blender Foundation - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#pragma once -CCL_NAMESPACE_BEGIN - -ccl_device_inline uint32_t laine_karras_permutation(uint32_t x, uint32_t seed) -{ - x += seed; - x ^= (x * 0x6c50b47cu); - x ^= x * 0xb82f1e52u; - x ^= x * 0xc7afe638u; - x ^= x * 0x8d22f6e6u; - - return x; -} - -ccl_device_inline uint32_t nested_uniform_scramble(uint32_t x, uint32_t seed) -{ - x = reverse_integer_bits(x); - x = laine_karras_permutation(x, seed); - x = reverse_integer_bits(x); - - return x; -} - -ccl_device_inline uint cmj_hash(uint i, uint p) -{ - i ^= p; - i ^= i >> 17; - i ^= i >> 10; - i *= 0xb36534e5; - i ^= i >> 12; - i ^= i >> 21; - i *= 0x93fc4795; - i ^= 0xdf6e307f; - i ^= i >> 17; - i *= 1 | p >> 18; - - return i; -} - -ccl_device_inline uint cmj_hash_simple(uint i, uint p) -{ - i = (i ^ 61) ^ p; - i += i << 3; - i ^= i >> 4; - i *= 0x27d4eb2d; - return i; -} - -ccl_device_inline float cmj_randfloat(uint i, uint p) -{ - return cmj_hash(i, p) * (1.0f / 4294967808.0f); -} - -ccl_device_inline float cmj_randfloat_simple(uint i, uint p) -{ - return cmj_hash_simple(i, p) * (1.0f / (float)0xFFFFFFFF); -} - -ccl_device float pmj_sample_1D(KernelGlobals kg, uint sample, uint rng_hash, uint dimension) -{ - /* Perform Owen shuffle of the sample number to reorder the samples. */ -#ifdef _SIMPLE_HASH_ - const uint rv = cmj_hash_simple(dimension, rng_hash); -#else /* Use a _REGULAR_HASH_. */ - const uint rv = cmj_hash(dimension, rng_hash); -#endif -#ifdef _XOR_SHUFFLE_ -# warning "Using XOR shuffle." - const uint s = sample ^ rv; -#else /* Use _OWEN_SHUFFLE_ for reordering. */ - const uint s = nested_uniform_scramble(sample, rv); -#endif - - /* Based on the sample number a sample pattern is selected and offset by the dimension. */ - const uint sample_set = s / NUM_PMJ_SAMPLES; - const uint d = (dimension + sample_set); - const uint dim = d % NUM_PMJ_PATTERNS; - - /* The PMJ sample sets contain a sample with (x,y) with NUM_PMJ_SAMPLES so for 1D - * the x part is used for even dims and the y for odd. */ - int index = 2 * ((dim >> 1) * NUM_PMJ_SAMPLES + (s % NUM_PMJ_SAMPLES)) + (dim & 1); - - float fx = kernel_tex_fetch(__sample_pattern_lut, index); - -#ifndef _NO_CRANLEY_PATTERSON_ROTATION_ - /* Use Cranley-Patterson rotation to displace the sample pattern. */ -# ifdef _SIMPLE_HASH_ - float dx = cmj_randfloat_simple(d, rng_hash); -# else - float dx = cmj_randfloat(d, rng_hash); -# endif - /* Jitter sample locations and map back into [0 1]. */ - fx = fx + dx; - fx = fx - floorf(fx); -#else -# warning "Not using Cranley-Patterson Rotation." -#endif - - return fx; -} - -ccl_device void pmj_sample_2D(KernelGlobals kg, - uint sample, - uint rng_hash, - uint dimension, - ccl_private float *x, - ccl_private float *y) -{ - /* Perform a shuffle on the sample number to reorder the samples. */ -#ifdef _SIMPLE_HASH_ - const uint rv = cmj_hash_simple(dimension, rng_hash); -#else /* Use a _REGULAR_HASH_. */ - const uint rv = cmj_hash(dimension, rng_hash); -#endif -#ifdef _XOR_SHUFFLE_ -# warning "Using XOR shuffle." - const uint s = sample ^ rv; -#else /* Use _OWEN_SHUFFLE_ for reordering. */ - const uint s = nested_uniform_scramble(sample, rv); -#endif - - /* Based on the sample number a sample pattern is selected and offset by the dimension. */ - const uint sample_set = s / NUM_PMJ_SAMPLES; - const uint d = (dimension + sample_set); - uint dim = d % NUM_PMJ_PATTERNS; - int index = 2 * (dim * NUM_PMJ_SAMPLES + (s % NUM_PMJ_SAMPLES)); - - float fx = kernel_tex_fetch(__sample_pattern_lut, index); - float fy = kernel_tex_fetch(__sample_pattern_lut, index + 1); - -#ifndef _NO_CRANLEY_PATTERSON_ROTATION_ - /* Use Cranley-Patterson rotation to displace the sample pattern. */ -# ifdef _SIMPLE_HASH_ - float dx = cmj_randfloat_simple(d, rng_hash); - float dy = cmj_randfloat_simple(d + 1, rng_hash); -# else - float dx = cmj_randfloat(d, rng_hash); - float dy = cmj_randfloat(d + 1, rng_hash); -# endif - /* Jitter sample locations and map back to the unit square [0 1]x[0 1]. */ - float sx = fx + dx; - float sy = fy + dy; - sx = sx - floorf(sx); - sy = sy - floorf(sy); -#else -# warning "Not using Cranley Patterson Rotation." -#endif - - (*x) = sx; - (*y) = sy; -} - -CCL_NAMESPACE_END |