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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.
*/
#ifndef __KERNEL_COMPAT_CPU_H__
#define __KERNEL_COMPAT_CPU_H__
#define __KERNEL_CPU__
#include "util_debug.h"
#include "util_math.h"
#include "util_types.h"
CCL_NAMESPACE_BEGIN
/* Assertions inside the kernel only work for the CPU device, so we wrap it in
a macro which is empty for other devices */
#define kernel_assert(cond) assert(cond)
/* Texture types to be compatible with CUDA textures. These are really just
simple arrays and after inlining fetch hopefully revert to being a simple
pointer lookup. */
template<typename T> struct texture {
T fetch(int index)
{
kernel_assert(index >= 0 && index < width);
return data[index];
}
/*__m128 fetch_m128(int index)
{
kernel_assert(index >= 0 && index < width);
return ((__m128*)data)[index];
}
__m128i fetch_m128i(int index)
{
kernel_assert(index >= 0 && index < width);
return ((__m128i*)data)[index];
}*/
float interp(float x, int size)
{
kernel_assert(size == width);
x = clamp(x, 0.0f, 1.0f)*width;
int index = min((int)x, width-1);
int nindex = min(index+1, width-1);
float t = x - index;
return (1.0f - t)*data[index] + t*data[nindex];
}
T *data;
int width;
};
template<typename T> struct texture_image {
float4 read(float4 r)
{
return r;
}
float4 read(uchar4 r)
{
float f = 1.0f/255.0f;
return make_float4(r.x*f, r.y*f, r.z*f, r.w*f);
}
int wrap_periodic(int x, int width)
{
x %= width;
if(x < 0)
x += width;
return x;
}
int wrap_clamp(int x, int width)
{
return clamp(x, 0, width-1);
}
float frac(float x, int *ix)
{
int i = (int)x - ((x < 0.0f)? 1: 0);
*ix = i;
return x - (float)i;
}
float4 interp(float x, float y, bool periodic = true)
{
if(!data)
return make_float4(0.0f, 0.0f, 0.0f, 0.0f);
int ix, iy, nix, niy;
float tx = frac(x*width, &ix);
float ty = frac(y*height, &iy);
if(periodic) {
ix = wrap_periodic(ix, width);
iy = wrap_periodic(iy, height);
nix = wrap_periodic(ix+1, width);
niy = wrap_periodic(iy+1, height);
}
else {
ix = wrap_clamp(ix, width);
iy = wrap_clamp(iy, height);
nix = wrap_clamp(ix+1, width);
niy = wrap_clamp(iy+1, height);
}
float4 r = (1.0f - ty)*(1.0f - tx)*read(data[ix + iy*width]);
r += (1.0f - ty)*tx*read(data[nix + iy*width]);
r += ty*(1.0f - tx)*read(data[ix + niy*width]);
r += ty*tx*read(data[nix + niy*width]);
return r;
}
T *data;
int width, height;
};
typedef texture<float4> texture_float4;
typedef texture<float2> texture_float2;
typedef texture<float> texture_float;
typedef texture<uint> texture_uint;
typedef texture<int> texture_int;
typedef texture<uint4> texture_uint4;
typedef texture_image<float4> texture_image_float4;
typedef texture_image<uchar4> texture_image_uchar4;
/* Macros to handle different memory storage on different devices */
#define kernel_tex_fetch(tex, index) (kg->tex.fetch(index))
#define kernel_tex_fetch_m128(tex, index) (kg->tex.fetch_m128(index))
#define kernel_tex_fetch_m128i(tex, index) (kg->tex.fetch_m128i(index))
#define kernel_tex_interp(tex, t, size) (kg->tex.interp(t, size))
#define kernel_tex_image_interp(tex, x, y) (kg->tex.interp(x, y))
#define kernel_data (kg->__data)
CCL_NAMESPACE_END
#endif /* __KERNEL_COMPAT_CPU_H__ */
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