Initial commit

Torque/SDK/engine/dgl/stripCache.cc

@@ -0,0 +1,57 @@
+//-----------------------------------------------------------------------------
+// Torque Game Engine
+// Copyright (C) GarageGames.com, Inc.
+//-----------------------------------------------------------------------------
+
+#include "dgl/stripCache.h"
+#include "platform/platformGL.h"
+
+void StripCache::emitStrip(const U32 start, const U32 count, const ColorI& color)
+{
+   if (count < 3) {
+      AssertFatal(false, "Strip count < 3");
+      return;
+   }
+
+   if (currIndex + count >= 1024)
+      flushCache();
+
+   // Contiguous index enforcement
+   if (currIndex != 0 && start != (stripIndices[currIndex - 1]+1))
+      flushCache();
+
+   stripStarts[currStrip]   = currIndex;
+   stripColors[currStrip++] = color;
+   for (U32 i = start; i < start+count; i++)
+      stripIndices[currIndex++] = i;
+}
+
+void StripCache::flushCache()
+{
+   if (currIndex == 0)
+      return;
+
+   // We know that (for right now) the first index is the least, and the
+   //  last is the greatest.  The commented condition in the emitStrip
+   //  call makes sure this range is contiguous...
+   U32 first = stripIndices[0];
+   U32 last  = stripIndices[currIndex-1];
+
+   stripStarts[currStrip] = currIndex;
+
+   if (dglDoesSupportCompiledVertexArray())
+      glLockArraysEXT(first, last - first + 1);
+
+   for (U32 i = 0; i < currStrip; i++) {
+      glColor4ubv(stripColors[i]);
+      glDrawElements(GL_TRIANGLE_STRIP, stripStarts[i+1] - stripStarts[i],
+                     GL_UNSIGNED_INT, &stripIndices[stripStarts[i]]);
+   }
+
+   if (dglDoesSupportCompiledVertexArray())
+      glUnlockArraysEXT();
+
+   currIndex = 0;
+   currStrip = 0;
+}
+