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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* Constant Globals */
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
#define MAX_BYTE_IMAGES 512
#define MAX_FLOAT_IMAGES 5
typedef struct KernelGlobals {
texture_image_uchar4 texture_byte_images[MAX_BYTE_IMAGES];
texture_image_float4 texture_float_images[MAX_FLOAT_IMAGES];
#define KERNEL_TEX(type, ttype, name) ttype name;
#define KERNEL_IMAGE_TEX(type, ttype, name)
#include "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
} KernelGlobals;
#endif
/* 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 {} KernelGlobals;
#define KERNEL_TEX(type, ttype, name) ttype name;
#define KERNEL_IMAGE_TEX(type, ttype, name) ttype name;
#include "kernel_textures.h"
#endif
/* OpenCL */
#ifdef __KERNEL_OPENCL__
typedef struct KernelGlobals {
__constant KernelData *data;
#define KERNEL_TEX(type, ttype, name) \
__global type *name;
#include "kernel_textures.h"
} KernelGlobals;
#endif
/* Interpolated lookup table access */
__device float lookup_table_read(KernelGlobals *kg, float x, int offset, int size)
{
x = clamp(x, 0.0f, 1.0f)*(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;
}
__device float lookup_table_read_2D(KernelGlobals *kg, float x, float y, int offset, int xsize, int ysize)
{
y = clamp(y, 0.0f, 1.0f)*(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
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