1 files changed, 102 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_GlareStreaksOperation.cc b/source/blender/compositor/operations/COM_GlareStreaksOperation.cc
new file mode 100644
index 00000000000..4fccb62e3df
--- /dev/null
+++ b/source/blender/compositor/operations/COM_GlareStreaksOperation.cc
@@ -0,0 +1,102 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2011, Blender Foundation.
+ */
+
+#include "COM_GlareStreaksOperation.h"
+#include "BLI_math.h"
+
+void GlareStreaksOperation::generateGlare(float *data,
+                                          MemoryBuffer *inputTile,
+                                          NodeGlare *settings)
+{
+  int x, y, n;
+  unsigned int nump = 0;
+  float c1[4], c2[4], c3[4], c4[4];
+  float a, ang = DEG2RADF(360.0f) / (float)settings->streaks;
+
+  int size = inputTile->getWidth() * inputTile->getHeight();
+  int size4 = size * 4;
+
+  bool breaked = false;
+
+  MemoryBuffer *tsrc = inputTile->duplicate();
+  MemoryBuffer *tdst = new MemoryBuffer(COM_DT_COLOR, inputTile->getRect());
+  tdst->clear();
+  memset(data, 0, size4 * sizeof(float));
+
+  for (a = 0.0f; a < DEG2RADF(360.0f) && (!breaked); a += ang) {
+    const float an = a + settings->angle_ofs;
+    const float vx = cos((double)an), vy = sin((double)an);
+    for (n = 0; n < settings->iter && (!breaked); n++) {
+      const float p4 = pow(4.0, (double)n);
+      const float vxp = vx * p4, vyp = vy * p4;
+      const float wt = pow((double)settings->fade, (double)p4);
+      const float cmo = 1.0f -
+                        (float)pow((double)settings->colmod,
+                                   (double)n +
+                                       1);  // colormodulation amount relative to current pass
+      float *tdstcol = tdst->getBuffer();
+      for (y = 0; y < tsrc->getHeight() && (!breaked); y++) {
+        for (x = 0; x < tsrc->getWidth(); x++, tdstcol += 4) {
+          // first pass no offset, always same for every pass, exact copy,
+          // otherwise results in uneven brightness, only need once
+          if (n == 0) {
+            tsrc->read(c1, x, y);
+          }
+          else {
+            c1[0] = c1[1] = c1[2] = 0;
+          }
+          tsrc->readBilinear(c2, x + vxp, y + vyp);
+          tsrc->readBilinear(c3, x + vxp * 2.0f, y + vyp * 2.0f);
+          tsrc->readBilinear(c4, x + vxp * 3.0f, y + vyp * 3.0f);
+          // modulate color to look vaguely similar to a color spectrum
+          c2[1] *= cmo;
+          c2[2] *= cmo;
+
+          c3[0] *= cmo;
+          c3[1] *= cmo;
+
+          c4[0] *= cmo;
+          c4[2] *= cmo;
+
+          tdstcol[0] = 0.5f * (tdstcol[0] + c1[0] + wt * (c2[0] + wt * (c3[0] + wt * c4[0])));
+          tdstcol[1] = 0.5f * (tdstcol[1] + c1[1] + wt * (c2[1] + wt * (c3[1] + wt * c4[1])));
+          tdstcol[2] = 0.5f * (tdstcol[2] + c1[2] + wt * (c2[2] + wt * (c3[2] + wt * c4[2])));
+          tdstcol[3] = 1.0f;
+        }
+        if (isBraked()) {
+          breaked = true;
+        }
+      }
+      memcpy(tsrc->getBuffer(), tdst->getBuffer(), sizeof(float) * size4);
+    }
+
+    float *sourcebuffer = tsrc->getBuffer();
+    float factor = 1.0f / (float)(6 - settings->iter);
+    for (int i = 0; i < size4; i += 4) {
+      madd_v3_v3fl(&data[i], &sourcebuffer[i], factor);
+      data[i + 3] = 1.0f;
+    }
+
+    tdst->clear();
+    memcpy(tsrc->getBuffer(), inputTile->getBuffer(), sizeof(float) * size4);
+    nump++;
+  }
+
+  delete tsrc;
+  delete tdst;
+}