new testcase to generate an ascii-art mandlebrot

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@23429 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 61 insertions, 0 deletions

diff --git a/SingleSource/Benchmarks/Misc-C++/mandel-text.cpp b/SingleSource/Benchmarks/Misc-C++/mandel-text.cpp
new file mode 100644
index 00000000..5de52578
--- /dev/null
+++ b/SingleSource/Benchmarks/Misc-C++/mandel-text.cpp
@@ -0,0 +1,61 @@
+#include <stdio.h>
+int main()
+{
+    // output size
+    int rows = 40, cols = 78;
+
+    // number of iterations before we quit
+    int maxiter = 255;
+
+    int slowdown = 2000;
+
+    // size and position of the rect on the imaginary plane
+    double fViewRectReal = -2.3, fViewRectImg = -1.0;
+    double fMagLevel = 0.05;
+
+    for (int y=0; y < rows; y++)
+    {
+        // imaginary component of "c"
+        double fCImg = fViewRectImg + y * fMagLevel;
+        
+        for (int x=0; x < cols; x++)
+        {
+            // real component of "c"
+            bool bInside;
+            int n;
+           
+            for (int SLOW = 0; SLOW < slowdown; ++SLOW) {
+            double fCReal = fViewRectReal + x * fMagLevel;
+            double fZReal = fCReal;
+            double fZImg = fCImg;
+              bInside = true;
+ 
+              // apply the formula...
+              for (n=0; n < maxiter; n++) {
+                double fZRealSquared = fZReal * fZReal;
+                double fZImgSquared = fZImg * fZImg;
+
+                // have we escaped?
+                if (fZRealSquared + fZImgSquared > 4) {
+                    bInside = false;
+                    break;
+                }
+
+                // z = z^2 + c
+                fZImg = 2 * fZReal * fZImg + fCImg;
+                fZReal = fZRealSquared - fZImgSquared + fCReal;
+              }
+            }
+
+            if (bInside)
+                putchar(' ');
+            else if (n > 4)
+                putchar('.');
+            else if (n > 2)
+                putchar('+');
+            else
+                putchar('*');
+        }
+        putchar('\n');
+    }
+}