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

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

diff --git a/source/mupen64plus-video-arachnoid/src/Combiner/CombinerStageCreator.cpp b/source/mupen64plus-video-arachnoid/src/Combiner/CombinerStageCreator.cpp
new file mode 100755 (executable)
index 0000000..acb458f
--- /dev/null
+++ b/source/mupen64plus-video-arachnoid/src/Combiner/CombinerStageCreator.cpp
@@ -0,0 +1,110 @@
+/******************************************************************************
+ * 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 "CombinerStageCreator.h"
+
+//-----------------------------------------------------------------------------
+//* Set Stage
+//! Function used to set combiner stage, tries to simplify and optimize as 
+//! much as possible.
+//! From glN64
+//! @param[in] combineCycle Values to be added/subracted/multiplied and interpolated.
+//! @param[out] stageOut Simplified combine cycle with combiner formula.
+//-----------------------------------------------------------------------------
+void setStage(CombineCycle* combineCycle, CombinerStage* stageOut)
+{
+    // Load the first operand
+    stageOut->op[0].op = LOAD;
+    stageOut->op[0].param1 = combineCycle->loadValue;
+    stageOut->numOps = 1;
+
+    // If we're just subtracting zero, skip it
+    if (combineCycle->subValue != ZERO)
+    {
+        if (combineCycle->subValue == stageOut->op[0].param1)
+            stageOut->op[0].param1 = ZERO;
+        else
+        {
+            //Subract operation
+            stageOut->op[1].op = SUB;
+            stageOut->op[1].param1 = combineCycle->subValue;
+            stageOut->numOps++;
+        }
+    }
+
+    //Multiply operation
+    if ((stageOut->numOps > 1) || (stageOut->op[0].param1 != ZERO))
+    {
+        if (combineCycle->multValue == ZERO)
+        {
+            stageOut->numOps = 1;
+            stageOut->op[0].op = LOAD;
+            stageOut->op[0].param1 = ZERO;
+        }
+        else
+        {
+            if ( stageOut->numOps == 1 && stageOut->op[0].param1 == ONE )
+            {
+                //LOAD
+                stageOut->op[0].param1 = combineCycle->multValue;
+            }
+            else
+            {
+                //MULT
+                stageOut->op[stageOut->numOps].op = MUL;
+                stageOut->op[stageOut->numOps].param1 = combineCycle->multValue;
+                stageOut->numOps++;
+            }
+        }
+    }
+
+    //Don't bother adding zero
+    if (combineCycle->addValue != ZERO)
+    {
+            // If all we have so far is zero, then load this instead
+        if ((stageOut->numOps == 1) && (stageOut->op[0].param1 == ZERO))
+        {
+            stageOut->op[0].param1 = combineCycle->addValue;
+        }
+        else
+        {
+            stageOut->op[stageOut->numOps].op = ADD;
+            stageOut->op[stageOut->numOps].param1 = combineCycle->addValue;
+            stageOut->numOps++;
+        }
+    }
+
+    // Handle interpolation
+    if ((stageOut->numOps == 4) && (stageOut->op[1].param1 == stageOut->op[3].param1))
+    {
+        stageOut->numOps = 1;
+        stageOut->op[0].op = INTERPOLATE;
+        stageOut->op[0].param2 = stageOut->op[1].param1;
+        stageOut->op[0].param3 = stageOut->op[2].param1;
+    }
+}