From 663a667df86e36acaade5070305692f3c9199879 Mon Sep 17 00:00:00 2001
From: Kyle K <kylek389@gmail.com>
Date: Sat, 16 Oct 2010 15:17:08 -0500
Subject: Add more error checking

---
 obj.c       | 10 ++++++++++
 objloader.c | 43 +++++++++++++++++++++++++------------------
 2 files changed, 35 insertions(+), 18 deletions(-)

diff --git a/obj.c b/obj.c
index 3b834e5..20f66ca 100644
--- a/obj.c
+++ b/obj.c
@@ -1,4 +1,7 @@
 /* obj.c
+ *
+ * Kamil Kaminski
+ * kamilkss@gmail.com
  *
  * OBJ Loader
  * initial code: http://www.gamedev.net/community/forums/topic.asp?topic_id=312335
@@ -21,6 +24,10 @@ ObjModel* ObjLoadModel(char *memory, size_t size)
     /* initialize to zero */
     memset(ret, 0, sizeof(ObjModel));
 
+    /* if size is 0, meaning file was not loaded correctly, return null */
+    if (!size)
+        return ret;
+
     p = memory;
     e = memory + size;
     
@@ -228,6 +235,9 @@ size_t ObjLoadFile(char *szFileName, char **memory)
 
         fclose(file);
     }
+    else
+        perror("fopen");    
+
     return bytes;
 }
 
diff --git a/objloader.c b/objloader.c
index 1f5eddd..1b2ba67 100644
--- a/objloader.c
+++ b/objloader.c
@@ -81,26 +81,28 @@ static void setup_opengl(ObjModel *model)
     /* get the texture filename from obj */
     char *fname = ObjGetPath(model->mtl->map_Ka); /* ambient texture map */
     if (model->mtl != NULL)
+    {
         printf("ambient texture map: %s\n", model->mtl->map_Ka);
     
-    /* load texture */
-    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    pBytes = gltLoadTGA(fname, &iWidth, &iHeight, &iComponents, &eFormat);
-    if (!pBytes)
-        fprintf(stderr, "gltLoadTGA: failed to load texture!\n");
-
-    /* load texture image */
-    glTexImage2D(GL_TEXTURE_2D, 0, iComponents, iWidth, iHeight, 0, eFormat,
-                 GL_UNSIGNED_BYTE, pBytes);
-    free(pBytes);
-    
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    
-    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-    glEnable(GL_TEXTURE_2D);
+        /* load texture */
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+        pBytes = gltLoadTGA(fname, &iWidth, &iHeight, &iComponents, &eFormat);
+        if (!pBytes)
+            fprintf(stderr, "gltLoadTGA: failed to load texture!\n");
+
+        /* load texture image */
+        glTexImage2D(GL_TEXTURE_2D, 0, iComponents, iWidth, iHeight, 0, eFormat,
+                     GL_UNSIGNED_BYTE, pBytes);
+        free(pBytes);
+        
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+        
+        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+        glEnable(GL_TEXTURE_2D);
+    }
 }
 
 /* process SDL events */
@@ -223,6 +225,11 @@ int main(void)
     char *memory = NULL;
     size_t bytes = ObjLoadFile("./cube/cube.obj", &memory);
     ObjModel *model = ObjLoadModel(memory, bytes);
+    if (!bytes || model == NULL)
+    {
+        fprintf(stderr, "obj file could not be loaded!\n");
+        exit(-1);
+    }
 
     /* setup few stuff before rendring */
     setup_opengl(model);
-- 
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