cogl/tesselator: Update to the latest code from GLU

This grabs the latest code for libtess from git Mesa. This is mostly
so that we can get the following commit which fixes a lot of compiler
warnings in Clutter:

commit 75acb896c6da758d03e86f8725d6ca0cb2c6ad82
Author: Neil Roberts <neil@linux.intel.com>
Date:   Wed Jun 30 12:41:11 2010 +0100

    glu: Fix some compiler warnings in libtess
    
    When compiled with the more aggressive compiler warnings such as
    -Wshadow and -Wempty-body the libtess code gives a lot more
    warnings. This fixes the following issues:
    
    * The 'Swap' macro tries to combine multiple statements into one and
      then consume the trailing semicolon by using if(1){/*...*/}else.
      This gives warnings because the else part ends up with an empty
      statement. It also seems a bit dangerous because if the semicolon
      were missed then it would still be valid syntax but it would just
      ignore the following statement. This patch replaces it with the more
      common idiom do { /*...*/ } while(0).
    
    * 'free' was being used as a local variable name but this shadows the
      global function. This has been renamed to 'free_handle'
    
    * TRUE and FALSE were being unconditionally defined. Although this
      isn't currently a problem it seems better to guard them with #ifndef
      because it's quite common for them to be defined in other headers.
    
    https://bugs.freedesktop.org/show_bug.cgi?id=28845

cogl/tesselator/geom.c

@@ -198,7 +198,7 @@ printf("*********************%d\n",RandomInterpolate);
 
 #endif
 
-#define Swap(a,b)	if (1) { GLUvertex *t = a; a = b; b = t; } else
+#define Swap(a,b)	do { GLUvertex *t = a; a = b; b = t; } while (0)
 
 void __gl_edgeIntersect( GLUvertex *o1, GLUvertex *d1,
 			 GLUvertex *o2, GLUvertex *d2,

cogl/tesselator/mesh.c

@@ -38,8 +38,12 @@
 #include "mesh.h"
 #include "memalloc.h"
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 static GLUvertex *allocVertex()
 {

cogl/tesselator/normal.c

@@ -39,8 +39,12 @@
 #include <math.h>
 #include <assert.h>
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 #define Dot(u,v)	(u[0]*v[0] + u[1]*v[1] + u[2]*v[2])
 

cogl/tesselator/priorityq-heap.c

@@ -39,8 +39,12 @@
 
 #define INIT_SIZE	32
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 #ifdef FOR_TRITE_TEST_PROGRAM
 #define LEQ(x,y)	(*pq->leq)(x,y)
@@ -159,7 +163,7 @@ void pqInit( PriorityQ *pq )
 PQhandle pqInsert( PriorityQ *pq, PQkey keyNew )
 {
   long curr;
-  PQhandle free;
+  PQhandle free_handle;
 
   curr = ++ pq->size;
   if( (curr*2) > pq->max ) {
@@ -186,21 +190,21 @@ PQhandle pqInsert( PriorityQ *pq, PQkey keyNew )
   }
 
   if( pq->freeList == 0 ) {
-    free = curr;
+    free_handle = curr;
   } else {
-    free = pq->freeList;
-    pq->freeList = pq->handles[free].node;
+    free_handle = pq->freeList;
+    pq->freeList = pq->handles[free_handle].node;
   }
 
-  pq->nodes[curr].handle = free;
-  pq->handles[free].node = curr;
-  pq->handles[free].key = keyNew;
+  pq->nodes[curr].handle = free_handle;
+  pq->handles[free_handle].node = curr;
+  pq->handles[free_handle].key = keyNew;
 
   if( pq->initialized ) {
     FloatUp( pq, curr );
   }
-  assert(free != LONG_MAX);
-  return free;
+  assert(free_handle != LONG_MAX);
+  return free_handle;
 }
 
 /* really __gl_pqHeapExtractMin */

cogl/tesselator/priorityq.c

@@ -85,7 +85,7 @@ void pqDeletePriorityQ( PriorityQ *pq )
 
 #define LT(x,y)		(! LEQ(y,x))
 #define GT(x,y)		(! LEQ(x,y))
-#define Swap(a,b)	if(1){PQkey *tmp = *a; *a = *b; *b = tmp;}else
+#define Swap(a,b)	do{PQkey *tmp = *a; *a = *b; *b = tmp;}while(0)
 
 /* really __gl_pqSortInit */
 int pqInit( PriorityQ *pq )

cogl/tesselator/render.c

@@ -39,8 +39,12 @@
 #include "tess.h"
 #include "render.h"
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 /* This structure remembers the information we need about a primitive
  * to be able to render it later, once we have determined which
@@ -143,11 +147,11 @@ static void RenderMaximumFaceGroup( GLUtesselator *tess, GLUface *fOrig )
 
 #define AddToTrail(f,t)	((f)->trail = (t), (t) = (f), (f)->marked = TRUE)
 
-#define FreeTrail(t)	if( 1 ) { \
+#define FreeTrail(t)	do { \
 			  while( (t) != NULL ) { \
 			    (t)->marked = FALSE; t = (t)->trail; \
 			  } \
-			} else /* absorb trailing semicolon */
+			} while(0) /* absorb trailing semicolon */
 
 
 

cogl/tesselator/sweep.c

@@ -46,8 +46,12 @@
 #include "memalloc.h"
 #include "sweep.h"
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 #ifdef FOR_TRITE_TEST_PROGRAM
 extern void DebugEvent( GLUtesselator *tess );

cogl/tesselator/tess.c

@@ -47,8 +47,12 @@
 #define GLU_TESS_DEFAULT_TOLERANCE 0.0
 #define GLU_TESS_MESH		100112	/* void (*)(GLUmesh *mesh)	    */
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 /*ARGSUSED*/ static void GLAPIENTRY noBegin( GLenum type ) {}
 /*ARGSUSED*/ static void GLAPIENTRY noEdgeFlag( GLboolean boundaryEdge ) {}