Arachnoid GLESv1.1 plugin. Compile and run (a bit glitchy and no frameskip) on the...

[mupen64plus-pandora.git] / source / mupen64plus-video-arachnoid / src / Combiner / CombinerStageMerger.cpp

diff --git a/source/mupen64plus-video-arachnoid/src/Combiner/CombinerStageMerger.cpp b/source/mupen64plus-video-arachnoid/src/Combiner/CombinerStageMerger.cpp
new file mode 100755 (executable)
index 0000000..74156e4
--- /dev/null
+++ b/source/mupen64plus-video-arachnoid/src/Combiner/CombinerStageMerger.cpp
@@ -0,0 +1,115 @@
+/******************************************************************************
+ * Arachnoid Graphics Plugin for Mupen64Plus
+ * http://bitbucket.org/wahrhaft/mupen64plus-video-arachnoid/
+ *
+ * Copyright (C) 2007 Kristofer Karlsson, Rickard Niklasson
+ *
+ * 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.
+ *****************************************************************************/
+
+//*****************************************************************************
+// 
+// NOTE THAT THIS FILE IS BASED ON MATERIAL FROM glN64.
+// http://gln64.emulation64.com/
+//
+//*****************************************************************************
+
+#include "CombinerStructs.h"
+
+//-----------------------------------------------------------------------------
+//* Merge Stages
+//! Try two merge to stages into one
+//! From glN64
+//-----------------------------------------------------------------------------
+void mergeStages(Combiner* c)
+{
+
+    // If all we have is a load in the first stage we can just replace
+    // each occurance of COMBINED in the second stage with it
+    if ((c->stage[0].numOps == 1) && (c->stage[0].op[0].op == LOAD))
+    {
+        int combined = c->stage[0].op[0].param1;
+
+        for (int i = 0; i < c->stage[1].numOps; i++)
+        {
+            c->stage[0].op[i].op = c->stage[1].op[i].op;
+            c->stage[0].op[i].param1 = (c->stage[1].op[i].param1 == COMBINED) ? combined : c->stage[1].op[i].param1;
+            c->stage[0].op[i].param2 = (c->stage[1].op[i].param2 == COMBINED) ? combined : c->stage[1].op[i].param2;
+            c->stage[0].op[i].param3 = (c->stage[1].op[i].param3 == COMBINED) ? combined : c->stage[1].op[i].param3;
+        }
+
+        c->stage[0].numOps = c->stage[1].numOps;
+        c->numStages = 1;
+    }
+    // We can't do any merging on an interpolation
+    else if (c->stage[1].op[0].op != INTERPOLATE)
+    {
+        int numCombined = 0;
+
+        // See how many times the first stage is used in the second one
+        for (int i = 0; i < c->stage[1].numOps; i++)
+            if (c->stage[1].op[i].param1 == COMBINED)
+                numCombined++;
+
+        // If it's not used, just replace the first stage with the second
+        if (numCombined == 0)
+        {
+            for (int i = 0; i < c->stage[1].numOps; i++)
+            {
+                c->stage[0].op[i].op = c->stage[1].op[i].op;
+                c->stage[0].op[i].param1 = c->stage[1].op[i].param1;
+                c->stage[0].op[i].param2 = c->stage[1].op[i].param2;
+                c->stage[0].op[i].param3 = c->stage[1].op[i].param3;
+            }
+            c->stage[0].numOps = c->stage[1].numOps;
+
+            c->numStages = 1;
+        }
+        // If it's only used once
+        else if (numCombined == 1)
+        {
+            // It's only used in the load, so stack on the ops from stage 2 on stage 1
+            if (c->stage[1].op[0].param1 == COMBINED)
+            {
+                for (int i = 1; i < c->stage[1].numOps; i++)
+                {
+                    c->stage[0].op[c->stage[0].numOps].op = c->stage[1].op[i].op;
+                    c->stage[0].op[c->stage[0].numOps].param1 = c->stage[1].op[i].param1;
+                    c->stage[0].numOps++;
+                }
+
+                c->numStages = 1;
+            }
+            // Otherwise, if it's used in the second op, and that op isn't SUB
+            // we can switch the parameters so it works out to tack the ops onto stage 1
+            else if ((c->stage[1].op[1].param1 == COMBINED) && (c->stage[1].op[1].op != SUB))
+            {
+                c->stage[0].op[c->stage[0].numOps].op = c->stage[1].op[1].op;
+                c->stage[0].op[c->stage[0].numOps].param1 = c->stage[1].op[0].param1;
+                c->stage[0].numOps++;
+
+                // If there's another op, tack it onto stage 1 too
+                if (c->stage[1].numOps > 2)
+                {
+                    c->stage[0].op[c->stage[0].numOps].op = c->stage[1].op[2].op;
+                    c->stage[0].op[c->stage[0].numOps].param1 = c->stage[1].op[2].param1;
+                    c->stage[0].numOps++;
+                }
+
+                c->numStages = 1;
+            }
+        }
+    }
+}