129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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/* Constant Globals */
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CCL_NAMESPACE_BEGIN
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/* On the CPU, we pass along the struct KernelGlobals to nearly everywhere in
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* the kernel, to access constant data. These are all stored as "textures", but
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* these are really just standard arrays. We can't use actually globals because
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* multiple renders may be running inside the same process. */
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#ifdef __KERNEL_CPU__
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#ifdef __OSL__
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struct OSLGlobals;
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struct OSLThreadData;
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struct OSLShadingSystem;
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#endif
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#define MAX_BYTE_IMAGES 1024
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#define MAX_FLOAT_IMAGES 1024
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typedef struct KernelGlobals {
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texture_image_uchar4 texture_byte_images[MAX_BYTE_IMAGES];
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texture_image_float4 texture_float_images[MAX_FLOAT_IMAGES];
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#define KERNEL_TEX(type, ttype, name) ttype name;
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#define KERNEL_IMAGE_TEX(type, ttype, name)
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#include "kernel_textures.h"
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KernelData __data;
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#ifdef __OSL__
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/* On the CPU, we also have the OSL globals here. Most data structures are shared
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* with SVM, the difference is in the shaders and object/mesh attributes. */
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OSLGlobals *osl;
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OSLShadingSystem *osl_ss;
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OSLThreadData *osl_tdata;
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#endif
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} KernelGlobals;
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#endif
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/* For CUDA, constant memory textures must be globals, so we can't put them
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* into a struct. As a result we don't actually use this struct and use actual
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* globals and simply pass along a NULL pointer everywhere, which we hope gets
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* optimized out. */
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#ifdef __KERNEL_CUDA__
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__constant__ KernelData __data;
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typedef struct KernelGlobals {} KernelGlobals;
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#ifdef __KERNEL_CUDA_TEX_STORAGE__
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#define KERNEL_TEX(type, ttype, name) ttype name;
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#else
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#define KERNEL_TEX(type, ttype, name) const __constant__ __device__ type *name;
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#endif
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#define KERNEL_IMAGE_TEX(type, ttype, name) ttype name;
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#include "kernel_textures.h"
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#endif
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/* OpenCL */
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#ifdef __KERNEL_OPENCL__
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typedef struct KernelGlobals {
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ccl_constant KernelData *data;
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#define KERNEL_TEX(type, ttype, name) \
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ccl_global type *name;
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#include "kernel_textures.h"
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} KernelGlobals;
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#endif
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/* Interpolated lookup table access */
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ccl_device float lookup_table_read(KernelGlobals *kg, float x, int offset, int size)
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{
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x = clamp(x, 0.0f, 1.0f)*(size-1);
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int index = min(float_to_int(x), size-1);
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int nindex = min(index+1, size-1);
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float t = x - index;
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float data0 = kernel_tex_fetch(__lookup_table, index + offset);
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if(t == 0.0f)
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return data0;
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float data1 = kernel_tex_fetch(__lookup_table, nindex + offset);
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return (1.0f - t)*data0 + t*data1;
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}
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ccl_device float lookup_table_read_2D(KernelGlobals *kg, float x, float y, int offset, int xsize, int ysize)
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{
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y = clamp(y, 0.0f, 1.0f)*(ysize-1);
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int index = min(float_to_int(y), ysize-1);
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int nindex = min(index+1, ysize-1);
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float t = y - index;
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float data0 = lookup_table_read(kg, x, offset + xsize*index, xsize);
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if(t == 0.0f)
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return data0;
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float data1 = lookup_table_read(kg, x, offset + xsize*nindex, xsize);
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return (1.0f - t)*data0 + t*data1;
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}
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CCL_NAMESPACE_END
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