103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
/*
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Note: This code was modified from example code
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originally provided by Intel. To comply with Intel's open source
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licensing agreement, their copyright is retained below.
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-----------------------------------------------------------------
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Copyright (c) 2010-2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace
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{
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int mandel(float c_re, float c_im, int count)
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{
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float z_re = c_re, z_im = c_im;
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int i;
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for (i = 0; i < count; ++i)
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{
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if (z_re * z_re + z_im * z_im > 4.f)
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break;
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float new_re = (z_re * z_re) - (z_im * z_im);
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float new_im = 2.f * z_re * z_im;
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z_re = c_re + new_re;
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z_im = c_im + new_im;
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}
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return i;
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}
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} // namespace
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//
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// MandelbrotSerial --
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//
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// Compute an image visualizing the mandelbrot set. The resulting
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// array contains the number of iterations required before the complex
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// number corresponding to a pixel could be rejected from the set.
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//
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// * x0, y0, x1, y1 describe the complex coordinates mapping
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// into the image viewport.
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// * width, height describe the size of the output image
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// * startRow, totalRows describe how much of the image to compute
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void mandelbrot_serial(float x0,
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float y0,
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float x1,
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float y1,
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int width,
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int height,
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int start_row,
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int total_rows,
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int max_iterations,
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int *output)
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{
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float dx = (x1 - x0) / (float)width;
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float dy = (y1 - y0) / (float)height;
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int end_row = start_row + total_rows;
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for (int j = start_row; j < end_row; j++)
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{
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for (int i = 0; i < width; ++i)
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{
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float x = x0 + ((float)i * dx);
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float y = y0 + ((float)j * dy);
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int index = ((j * width) + i);
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output[index] = mandel(x, y, max_iterations);
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}
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}
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}
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