79 lines
3.1 KiB
Plaintext
79 lines
3.1 KiB
Plaintext
/*
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Copyright (c) 2010-2012, 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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static inline int mandel(float c_re, float c_im, int count) {
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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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if (z_re * z_re + z_im * z_im > 4.)
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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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unmasked {
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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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}
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return i;
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}
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export void mandelbrot_ispc(uniform float x0, uniform float y0,
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uniform float x1, uniform float y1,
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uniform int width, uniform int height,
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uniform int maxIterations,
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uniform int output[])
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{
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float dx = (x1 - x0) / width;
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float dy = (y1 - y0) / height;
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for (uniform int j = 0; j < height; j++) {
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// Note that we'll be doing programCount computations in parallel,
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// so increment i by that much. This assumes that width evenly
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// divides programCount.
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foreach (i = 0 ... width) {
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// Figure out the position on the complex plane to compute the
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// number of iterations at. Note that the x values are
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// different across different program instances, since its
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// initializer incorporates the value of the programIndex
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// variable.
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float x = x0 + i * dx;
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float y = y0 + j * dy;
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int index = j * width + i;
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output[index] = mandel(x, y, maxIterations);
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}
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}
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}
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