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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.
*/
/* Constant Globals */
#ifndef __KERNEL_GLOBALS_H__
#define __KERNEL_GLOBALS_H__
CCL_NAMESPACE_BEGIN
/* On the CPU, we pass along the struct KernelGlobals to nearly everywhere in
* the kernel, to access constant data. These are all stored as "textures", but
* these are really just standard arrays. We can't use actually globals because
* multiple renders may be running inside the same process. */
#ifdef __KERNEL_CPU__
# ifdef __OSL__
struct OSLGlobals;
struct OSLThreadData;
struct OSLShadingSystem;
# endif
struct Intersection;
struct VolumeStep;
typedef struct KernelGlobals {
texture_image_uchar4 texture_byte4_images[TEX_NUM_BYTE4_CPU];
texture_image_float4 texture_float4_images[TEX_NUM_FLOAT4_CPU];
texture_image_half4 texture_half4_images[TEX_NUM_HALF4_CPU];
texture_image_float texture_float_images[TEX_NUM_FLOAT_CPU];
texture_image_uchar texture_byte_images[TEX_NUM_BYTE_CPU];
texture_image_half texture_half_images[TEX_NUM_HALF_CPU];
# define KERNEL_TEX(type, ttype, name) ttype name;
# define KERNEL_IMAGE_TEX(type, ttype, name)
# include "kernel/kernel_textures.h"
KernelData __data;
# ifdef __OSL__
/* On the CPU, we also have the OSL globals here. Most data structures are shared
* with SVM, the difference is in the shaders and object/mesh attributes. */
OSLGlobals *osl;
OSLShadingSystem *osl_ss;
OSLThreadData *osl_tdata;
# endif
/* **** Run-time data **** */
/* Heap-allocated storage for transparent shadows intersections. */
Intersection *transparent_shadow_intersections;
/* Storage for decoupled volume steps. */
VolumeStep *decoupled_volume_steps[2];
int decoupled_volume_steps_index;
/* split kernel */
SplitData split_data;
SplitParams split_param_data;
int2 global_size;
int2 global_id;
} KernelGlobals;
#endif /* __KERNEL_CPU__ */
/* For CUDA, constant memory textures must be globals, so we can't put them
* into a struct. As a result we don't actually use this struct and use actual
* globals and simply pass along a NULL pointer everywhere, which we hope gets
* optimized out. */
#ifdef __KERNEL_CUDA__
__constant__ KernelData __data;
typedef struct KernelGlobals {
/* NOTE: Keep the size in sync with SHADOW_STACK_MAX_HITS. */
Intersection hits_stack[64];
} KernelGlobals;
# ifdef __KERNEL_CUDA_TEX_STORAGE__
# define KERNEL_TEX(type, ttype, name) ttype name;
# else
# define KERNEL_TEX(type, ttype, name) const __constant__ __device__ type *name;
# endif
# define KERNEL_IMAGE_TEX(type, ttype, name) ttype name;
# include "kernel/kernel_textures.h"
#endif /* __KERNEL_CUDA__ */
/* OpenCL */
#ifdef __KERNEL_OPENCL__
typedef ccl_addr_space struct KernelGlobals {
ccl_constant KernelData *data;
# define KERNEL_TEX(type, ttype, name) \
ccl_global type *name;
# include "kernel/kernel_textures.h"
# ifdef __SPLIT_KERNEL__
SplitData split_data;
SplitParams split_param_data;
# endif
} KernelGlobals;
#endif /* __KERNEL_OPENCL__ */
/* Interpolated lookup table access */
ccl_device float lookup_table_read(KernelGlobals *kg, float x, int offset, int size)
{
x = saturate(x)*(size-1);
int index = min(float_to_int(x), size-1);
int nindex = min(index+1, size-1);
float t = x - index;
float data0 = kernel_tex_fetch(__lookup_table, index + offset);
if(t == 0.0f)
return data0;
float data1 = kernel_tex_fetch(__lookup_table, nindex + offset);
return (1.0f - t)*data0 + t*data1;
}
ccl_device float lookup_table_read_2D(KernelGlobals *kg, float x, float y, int offset, int xsize, int ysize)
{
y = saturate(y)*(ysize-1);
int index = min(float_to_int(y), ysize-1);
int nindex = min(index+1, ysize-1);
float t = y - index;
float data0 = lookup_table_read(kg, x, offset + xsize*index, xsize);
if(t == 0.0f)
return data0;
float data1 = lookup_table_read(kg, x, offset + xsize*nindex, xsize);
return (1.0f - t)*data0 + t*data1;
}
CCL_NAMESPACE_END
#endif /* __KERNEL_GLOBALS_H__ */
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