Added getmesh function

include/devil1geo.h

@@ -52,7 +52,7 @@ struct BatchData {
 };
 
 struct VertexData {
-    // following structs should in an array of size numVertex
+    // following structs should in an array of size 'numVertex'
     struct Coordinate   *positions;
     struct Coordinate   *normals;
     struct UVs          *u;
@@ -60,15 +60,13 @@ struct VertexData {
     struct BoneWeights  *bw;
 };
 
-// This is where most of the parsing will be.
-// this struct is in-order of what the file format will have.
 struct Batch {
-    struct BatchData  *bd;
-    struct VertexData vd;
+    struct BatchData  *bd; // pointer to region in file data
+    struct VertexData vd;  // collection of pointers to regions in file data
 };
 
 struct Mesh {
-    // may contain multiple batches
+    // array of batches
     struct Batch *b;
 };
 
@@ -85,10 +83,9 @@ void printcoordinate(struct Coordinate*, unsigned int);
 // ** = 'pass by reference' of a pointer to struct
 bool getmeshheader(struct MeshHeader**, unsigned int i, const char * const);
 
-// ** = 'pass by reference' of a pointer to struct
-bool getmeshbatch(struct Batch*, 
-                  unsigned int offset, 
-                  const char * const);
+bool getmeshbatch(struct Batch*, unsigned int offset, const char * const);
+
+bool getmesh(struct Mesh*, unsigned int i, const char* filename);
 
 #endif
 

src/devil1geo.c

@@ -88,3 +88,28 @@ bool getmeshbatch(struct Batch *b,
     done = true;
     return done;
 }
+
+// assume client has allocated memory for mesh
+bool getmesh(struct Mesh *m,
+             unsigned int i,
+             const char * const filedata) {        
+    bool done = false;
+    if (m == NULL || filedata == NULL || m -> b == NULL) {
+        return done;
+    }
+    struct MeshHeader *mh = NULL;
+    bool ok = getmeshheader(&mh, i, filedata);
+    if (ok) {
+        unsigned int j;
+        struct Batch b;
+        for (j = 0; j < mh -> numBatch; j++) {
+            unsigned int offset = mh->offsetBatches + j * sizeof(struct BatchData);
+            getmeshbatch(&b, offset, filedata);
+            printmeshbatch(&b);
+            m -> b[j] = b;
+        }
+        done = true;
+    }
+    return done;
+}
+

test/main.c

@@ -113,20 +113,17 @@ void extractmeshes(const char *filedata,
     }
     struct Header *h = (struct Header*)filedata;
     struct MeshHeader *mh = NULL;
-    struct Batch  b;
+    struct Mesh m;
+    m.b = NULL;
     unsigned int i;
-    unsigned int j;
-    bool ok;
-    //for (i = 0; i < 5; i++) {
     for (i = 0; i < h -> numMesh; i++) {
-        ok = getmeshheader(&mh, i, filedata);
-        if (ok) {
-            for (j = 0; j < mh -> numBatch; j++) {
-                unsigned int offset = mh->offsetBatches + j * sizeof(struct BatchData);
-                getmeshbatch(&b, offset, filedata);
-                printmeshbatch(&b);
-            } // end for
-        } // end if
+        getmeshheader(&mh, i, filedata);
+        m.b = (struct Batch*)malloc(sizeof(struct Batch) * (mh -> numBatch));
+        if (m.b != NULL) {
+            getmesh(&m, i, filedata);
+            // do something with mesh e.g write to file.
+            free(m.b);
+        }
     } // end for
 }
 
@@ -141,3 +138,4 @@ int main(int argc, char ** argv) {
     return 0;
 }
 
+