From 59e2e32b7fce3e00408486a8ba56f2a0bfc62455 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Fri, 6 Aug 2010 01:17:50 -0400
Subject: [PATCH] Fix Mandelbrot example for AMD. (patch by Ren Lifeng)
---
examples/demo_mandelbrot.py | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/examples/demo_mandelbrot.py b/examples/demo_mandelbrot.py
index 45fd74e5..4919dbb0 100644
--- a/examples/demo_mandelbrot.py
+++ b/examples/demo_mandelbrot.py
@@ -41,6 +41,7 @@ def calc_fractal_opencl(q, maxiter):
output_opencl = cl.Buffer(ctx, mf.WRITE_ONLY, output.nbytes)
prg = cl.Program(ctx, """
+ #pragma OPENCL EXTENSION cl_khr_byte_addressable_store : enable
__kernel void mandelbrot(__global float2 *q,
__global ushort *output, ushort const maxiter)
{
@@ -51,11 +52,11 @@ def calc_fractal_opencl(q, maxiter):
output[gid] = 0;
for(int curiter = 0; curiter < maxiter; curiter++) {
- nreal = real*real - imag*imag + q[gid][0];
- imag = 2* real*imag + q[gid][1];
+ nreal = real*real - imag*imag + q[gid].x;
+ imag = 2* real*imag + q[gid].y;
real = nreal;
- if (real*real + imag*imag > 4.)
+ if (real*real + imag*imag > 4.0f)
output[gid] = curiter;
}
}
--
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