kernel_globals.h

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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 */

#ifdef __KERNEL_CPU__

#ifdef __OSL__
#include "osl_globals.h"
#endif

#endif

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__

typedef struct KernelGlobals {

#define KERNEL_TEX(type, ttype, name) ttype name;
#define KERNEL_IMAGE_TEX(type, ttype, name) 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;
#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

CCL_NAMESPACE_END