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blender/intern/cycles/kernel/kernel_textures.h
Sergey Sharybin dc7bbd731a Cycles: Fix wrong hair render results when using BVH motion steps 
The issue here was mainly coming from minimal pixel width feature
which is quite commonly enabled in production shots.

This feature will use some probabilistic heuristic in the curve
intersection function to check whether we need to return intersection
or not. This probability is calculated for every intersection check.
Now, when we use multiple BVH nodes for curve primitives we increase
probability of that primitive to be considered a good intersection
for us. This is similar to increasing minimal width of curve.

What is worst here is that change in the intersection probability
fully depends on exact layout of BVH, meaning probability might
change differently depending on a view angle, the way how builder
binned the primitives and such. This makes it impossible to do
simple check like dividing probability by number of BVH steps.

Other solution might have been to split BVH into fully independent
trees, but that will increase memory usage of all the static
objects in the scenes, which is also not something desirable.

For now used most simple but robust approach: store BVH primitives
time and test it in curve intersection functions. This solves the
regression, but has two downsides:

- Uses more memory.

  which isn't surprising, and ANY solution to this problem will
  use more memory.

  What we still have to do is to avoid this memory increase for
  cases when we don't use BVH motion steps.

- Reduces number of maximum available textures on pre-kepler cards.

  There is not much we can do here, hardware gets old but we need
  to move forward on more modern hardware..
2017-02-15 12:45:04 +01:00

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/*
* 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.
*/
#ifndef KERNEL_TEX
# define KERNEL_TEX(type, ttype, name)
#endif
#ifndef KERNEL_IMAGE_TEX
# define KERNEL_IMAGE_TEX(type, ttype, name)
#endif
/* bvh */
KERNEL_TEX(float4, texture_float4, __bvh_nodes)
KERNEL_TEX(float4, texture_float4, __bvh_leaf_nodes)
KERNEL_TEX(float4, texture_float4, __prim_tri_verts)
KERNEL_TEX(uint, texture_uint, __prim_tri_index)
KERNEL_TEX(uint, texture_uint, __prim_type)
KERNEL_TEX(uint, texture_uint, __prim_visibility)
KERNEL_TEX(uint, texture_uint, __prim_index)
KERNEL_TEX(uint, texture_uint, __prim_object)
KERNEL_TEX(uint, texture_uint, __object_node)
KERNEL_TEX(float2, texture_float2, __prim_time)
/* objects */
KERNEL_TEX(float4, texture_float4, __objects)
KERNEL_TEX(float4, texture_float4, __objects_vector)
/* triangles */
KERNEL_TEX(uint, texture_uint, __tri_shader)
KERNEL_TEX(float4, texture_float4, __tri_vnormal)
KERNEL_TEX(uint4, texture_uint4, __tri_vindex)
KERNEL_TEX(uint, texture_uint, __tri_patch)
KERNEL_TEX(float2, texture_float2, __tri_patch_uv)
/* curves */
KERNEL_TEX(float4, texture_float4, __curves)
KERNEL_TEX(float4, texture_float4, __curve_keys)
/* patches */
KERNEL_TEX(uint, texture_uint, __patches)
/* attributes */
KERNEL_TEX(uint4, texture_uint4, __attributes_map)
KERNEL_TEX(float, texture_float, __attributes_float)
KERNEL_TEX(float4, texture_float4, __attributes_float3)
KERNEL_TEX(uchar4, texture_uchar4, __attributes_uchar4)
/* lights */
KERNEL_TEX(float4, texture_float4, __light_distribution)
KERNEL_TEX(float4, texture_float4, __light_data)
KERNEL_TEX(float2, texture_float2, __light_background_marginal_cdf)
KERNEL_TEX(float2, texture_float2, __light_background_conditional_cdf)
/* particles */
KERNEL_TEX(float4, texture_float4, __particles)
/* shaders */
KERNEL_TEX(uint4, texture_uint4, __svm_nodes)
KERNEL_TEX(uint, texture_uint, __shader_flag)
KERNEL_TEX(uint, texture_uint, __object_flag)
/* lookup tables */
KERNEL_TEX(float, texture_float, __lookup_table)
/* sobol */
KERNEL_TEX(uint, texture_uint, __sobol_directions)
#ifdef __KERNEL_CUDA__
# if __CUDA_ARCH__ < 300
/* full-float image */
KERNEL_IMAGE_TEX(float4, texture_image_float4, __tex_image_float4_000)
KERNEL_IMAGE_TEX(float4, texture_image_float4, __tex_image_float4_001)
KERNEL_IMAGE_TEX(float4, texture_image_float4, __tex_image_float4_002)
KERNEL_IMAGE_TEX(float4, texture_image_float4, __tex_image_float4_003)
KERNEL_IMAGE_TEX(float4, texture_image_float4, __tex_image_float4_004)
KERNEL_IMAGE_TEX(float4, texture_image3d_float4, __tex_image_float4_3d_000)
KERNEL_IMAGE_TEX(float4, texture_image3d_float4, __tex_image_float4_3d_001)
KERNEL_IMAGE_TEX(float4, texture_image3d_float4, __tex_image_float4_3d_002)
KERNEL_IMAGE_TEX(float4, texture_image3d_float4, __tex_image_float4_3d_003)
KERNEL_IMAGE_TEX(float4, texture_image3d_float4, __tex_image_float4_3d_004)
/* image */
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_005)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_006)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_007)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_008)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_009)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_010)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_011)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_012)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_013)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_014)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_015)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_016)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_017)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_018)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_019)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_020)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_021)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_022)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_023)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_024)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_025)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_026)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_027)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_028)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_029)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_030)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_031)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_032)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_033)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_034)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_035)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_036)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_037)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_038)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_039)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_040)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_041)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_042)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_043)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_044)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_045)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_046)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_047)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_048)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_049)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_050)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_051)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_052)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_053)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_054)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_055)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_056)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_057)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_058)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_059)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_060)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_061)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_062)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_063)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_064)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_065)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_066)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_067)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_068)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_069)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_070)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_071)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_072)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_073)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_074)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_075)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_076)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_077)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_078)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_079)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_080)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_081)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_082)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_083)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_084)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_085)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_086)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_087)
KERNEL_IMAGE_TEX(uchar4, texture_image_uchar4, __tex_image_byte4_088)
# else
/* bindless textures */
KERNEL_TEX(uint, texture_uint, __bindless_mapping)
# endif
#endif
/* packed image (opencl) */
KERNEL_TEX(uchar4, texture_uchar4, __tex_image_byte4_packed)
KERNEL_TEX(float4, texture_float4, __tex_image_float4_packed)
KERNEL_TEX(uchar, texture_uchar, __tex_image_byte_packed)
KERNEL_TEX(float, texture_float, __tex_image_float_packed)
KERNEL_TEX(uint4, texture_uint4, __tex_image_packed_info)
#undef KERNEL_TEX
#undef KERNEL_IMAGE_TEX
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