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Andreas Kempe
mpi-mandelbrot
Commits
0df3feb5
Commit
0df3feb5
authored
Oct 1, 2015
by
Andreas Kempe
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Moved the mandelbrot drawer to a class.
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#include
<mpi.h>
#include
<iostream>
#include
<Magick++.h>
#include
<complex>
#include
<cmath>
#include
<sstream>
#include
<iomanip>
#define IMG_WIDTH 10640
#define IMG_HEIGHT 8000
#define ITERATIONS 2000
#define RE_MAX 1
#define RE_MIN -2
#define IM_MAX 1.4
#define IM_MIN -1.3
using
namespace
std
;
using
namespace
Magick
;
struct
MandelResult
{
float
end_iterations
;
bool
belongs
;
MandelResult
(
unsigned
long
end_iterations
,
bool
belongs
)
:
end_iterations
(
end_iterations
),
belongs
(
belongs
)
{}
};
complex
<
double
>
GetPixelCoordinate
(
int
x
,
int
y
)
{
double
re_size
=
abs
(
RE_MAX
)
+
abs
(
RE_MIN
);
double
im_size
=
abs
(
IM_MAX
)
+
abs
(
IM_MIN
);
double
re_pp
=
re_size
/
IMG_WIDTH
;
double
im_pp
=
im_size
/
IMG_HEIGHT
;
return
complex
<
double
>
(
re_pp
*
x
+
RE_MIN
,
im_pp
*
y
+
IM_MIN
);
}
MandelResult
IsMandelbrotPoint
(
unsigned
long
x
,
unsigned
long
y
,
unsigned
int
iterations
)
{
complex
<
double
>
point
=
GetPixelCoordinate
(
x
,
y
);
complex
<
double
>
series_value
(
0
,
0
);
for
(
unsigned
long
i
=
0
;
i
<
iterations
;
++
i
)
{
if
(
real
(
series_value
)
*
real
(
series_value
)
+
imag
(
series_value
)
*
imag
(
series_value
)
>=
4
)
return
MandelResult
(
i
+
1
-
log
(
log
(
abs
(
pow
(
series_value
,
2
)
+
point
)))
/
log
(
2
),
false
);
series_value
=
pow
(
series_value
,
2
)
+
point
;
}
return
MandelResult
(
iterations
,
true
);
}
int
main
(
int
argc
,
char
**
argv
)
{
int
id
;
int
procs
;
float
*
calculated_values
;
float
*
receive_buffer
=
nullptr
;
MPI_Init
(
&
argc
,
&
argv
);
MPI_Comm_size
(
MPI_COMM_WORLD
,
&
procs
);
MPI_Comm_rank
(
MPI_COMM_WORLD
,
&
id
);
int
effective_height
=
IMG_HEIGHT
;
// Calculate this threads working area.
effective_height
/=
procs
;
calculated_values
=
new
float
[
IMG_WIDTH
*
effective_height
];
for
(
unsigned
long
y
=
effective_height
*
id
;
y
<
effective_height
*
(
id
+
1
);
++
y
)
{
for
(
unsigned
long
x
=
0
;
x
<
IMG_WIDTH
;
++
x
)
{
MandelResult
result
=
IsMandelbrotPoint
(
x
,
y
,
ITERATIONS
);
calculated_values
[(
y
-
effective_height
*
id
)
*
IMG_WIDTH
+
x
]
=
result
.
end_iterations
;
}
}
if
(
id
==
0
)
receive_buffer
=
new
float
[
IMG_WIDTH
*
IMG_HEIGHT
];
cout
<<
"Process: "
<<
id
<<
", Gathering!"
<<
endl
;
MPI_Gather
(
calculated_values
,
IMG_WIDTH
*
effective_height
,
MPI_FLOAT
,
receive_buffer
,
IMG_WIDTH
*
effective_height
,
MPI_FLOAT
,
0
,
MPI_COMM_WORLD
);
cout
<<
"Process: "
<<
id
<<
", done gathering!"
<<
endl
;
if
(
id
==
0
)
{
Image
my_image
(
Geometry
(
IMG_WIDTH
,
IMG_HEIGHT
),
"white"
);
my_image
.
modifyImage
();
Pixels
pixel_cache
(
my_image
);
PixelPacket
*
pixels
=
pixel_cache
.
get
(
0
,
0
,
IMG_WIDTH
,
IMG_HEIGHT
);
float
max
=
0
;
for
(
unsigned
long
i
=
0
;
i
<
IMG_WIDTH
*
IMG_HEIGHT
;
++
i
)
{
if
(
receive_buffer
[
i
]
>
max
&&
receive_buffer
[
i
]
!=
ITERATIONS
)
max
=
receive_buffer
[
i
];
}
cout
<<
max
<<
endl
;
cout
<<
"Assembling image!"
<<
endl
;
for
(
unsigned
long
y
=
0
;
y
<
IMG_HEIGHT
;
++
y
)
{
cout
<<
"Progress: "
<<
setprecision
(
3
)
<<
static_cast
<
float
>
(
y
*
100
)
/
IMG_HEIGHT
<<
" %
\r
"
<<
flush
;
for
(
unsigned
long
x
=
0
;
x
<
IMG_WIDTH
;
++
x
)
{
int
iter_res
=
receive_buffer
[
y
*
IMG_WIDTH
+
x
];
if
(
iter_res
==
ITERATIONS
)
pixels
[
y
*
IMG_WIDTH
+
x
]
=
Color
(
MaxRGB
*
0.55
,
MaxRGB
*
0.35
,
MaxRGB
*
0.6
);
else
pixels
[
y
*
IMG_WIDTH
+
x
]
=
Color
(
MaxRGB
*
cosf
(
exp
(
iter_res
)),
0
,
MaxRGB
*
sinf
(
exp
(
iter_res
)));
}
}
pixel_cache
.
sync
();
cout
<<
"Progress: 100 % "
<<
endl
;
stringstream
ss
;
ss
<<
"output.png"
;
cout
<<
"Saving image!"
<<
endl
;
my_image
.
write
(
ss
.
str
());
}
delete
[]
calculated_values
;
delete
[]
receive_buffer
;
MPI_Finalize
();
}
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