textures are now only generated when actual *rendering* is done

rendernode.py

@@ -26,6 +26,8 @@ import collections
 import json
 import logging
 import util
+import textures
+import c_overviewer
 import cPickle
 import stat
 import errno 
@@ -60,13 +62,21 @@ def pool_initializer(rendernode):
     #stash the quadtree objects in a global variable after fork() for windows compat.
     global child_rendernode
     child_rendernode = rendernode
+    
+    # make sure textures are generated for this process
+    # and initialize c_overviewer
+    textures.generate()
+    c_overviewer.init_chunk_render()
+    
+    # load biome data in each process, if needed
     for quadtree in rendernode.quadtrees:
         if quadtree.world.useBiomeData:
-            import textures
             # make sure we've at least *tried* to load the color arrays in this process...
             textures.prepareBiomeData(quadtree.world.worlddir)
             if not textures.grasscolor or not textures.foliagecolor:
                 raise Exception("Can't find grasscolor.png or foliagecolor.png")
+            # only load biome data once
+            break
                     
 #http://docs.python.org/library/itertools.html    
 def roundrobin(iterables):

src/iterate.c

@@ -24,43 +24,41 @@ static PyObject *special_blocks = NULL;
 static PyObject *specialblockmap = NULL;
 static PyObject *transparent_blocks = NULL;
 
-int init_chunk_render(void) {
+PyObject *init_chunk_render(PyObject *self, PyObject *args) {
    
-    /* if blockmap (or any of these) is not NULL, then that means that we've 
-     * somehow called this function twice.  error out so we can notice this
-     * */
-    if (blockmap) return 1;
+    /* this function only needs to be called once, anything more is an
+     * error... */
+    if (blockmap) {
+        PyErr_SetString(PyExc_RuntimeError, "init_chunk_render should only be called once per process.");
+        return NULL;
+    }
 
     textures = PyImport_ImportModule("textures");
     /* ensure none of these pointers are NULL */    
     if ((!textures)) {
-        fprintf(stderr, "\ninit_chunk_render failed to load; textures\n");
-        PyErr_Print();
-        return 1;
+        return NULL;
     }
 
     chunk_mod = PyImport_ImportModule("chunk");
     /* ensure none of these pointers are NULL */    
     if ((!chunk_mod)) {
-        fprintf(stderr, "\ninit_chunk_render failed to load; chunk\n");
-        PyErr_Print();
-        return 1;
+        return NULL;
     }
     
     blockmap = PyObject_GetAttrString(textures, "blockmap");
+    if (!blockmap)
+        return NULL;
     special_blocks = PyObject_GetAttrString(textures, "special_blocks");
+    if (!special_blocks)
+        return NULL;
     specialblockmap = PyObject_GetAttrString(textures, "specialblockmap");
+    if (!specialblockmap)
+        return NULL;
     transparent_blocks = PyObject_GetAttrString(chunk_mod, "transparent_blocks");
+    if (!transparent_blocks)
+        return NULL;
     
-    /* ensure none of these pointers are NULL */    
-    if ((!transparent_blocks) || (!blockmap) || (!special_blocks) || (!specialblockmap)) {
-        fprintf(stderr, "\ninit_chunk_render failed\n");
-        PyErr_Print();
-        return 1;
-    }
-
-    return 0;
-
+    Py_RETURN_NONE;
 }
 
 int
@@ -310,7 +308,7 @@ chunk_render(PyObject *self, PyObject *args) {
     PyObject *t = NULL;
     
     if (!PyArg_ParseTuple(args, "OOiiO",  &state.self, &state.img, &xoff, &yoff, &blockdata_expanded))
-        return Py_BuildValue("i", "-1");
+        return NULL;
     
     /* fill in important modules */
     state.textures = textures;

src/main.c

@@ -26,6 +26,8 @@ static PyMethodDef COverviewerMethods[] = {
     {"alpha_over", alpha_over_wrap, METH_VARARGS,
      "alpha over composite function"},
     
+    {"init_chunk_render", init_chunk_render, METH_VARARGS,
+     "Initializes the stuffs renderer."},
     {"render_loop", chunk_render, METH_VARARGS,
      "Renders stuffs"},
     
@@ -54,11 +56,5 @@ initc_overviewer(void)
     /* for numpy */
     import_array();
     
-    /* initialize some required variables in iterage.c */
-    if (init_chunk_render()) {
-        fprintf(stderr, "failed to init_chunk_render\n");
-        exit(1); // TODO better way to indicate error?
-    }
-    
     init_endian();
 }

src/overviewer.h

@@ -26,7 +26,7 @@
 
 // increment this value if you've made a change to the c extesion
 // and want to force users to rebuild
-#define OVERVIEWER_EXTENSION_VERSION 5
+#define OVERVIEWER_EXTENSION_VERSION 6
 
 /* Python PIL, and numpy headers */
 #include <Python.h>
@@ -76,7 +76,7 @@ typedef struct {
     PyObject *left_blocks;
     PyObject *right_blocks;
 } RenderState;
-int init_chunk_render(void);
+PyObject *init_chunk_render(PyObject *self, PyObject *args);
 int is_transparent(unsigned char b);
 PyObject *chunk_render(PyObject *self, PyObject *args);
 

textures.py

@@ -112,9 +112,6 @@ def _split_terrain(terrain):
 
     return textures
 
-# This maps terainids to 16x16 images
-terrain_images = _split_terrain(_get_terrain_image())
-
 def transform_image(img, blockID=None):
     """Takes a PIL image and rotates it left 45 degrees and shrinks the y axis
     by a factor of 2. Returns the resulting image, which will be 24x12 pixels
@@ -460,7 +457,6 @@ def _build_blockimages():
     while len(allimages) < 256:
         allimages.append(None)
     return allimages
-blockmap = _build_blockimages()
 
 def load_water():
     """Evidentially, the water and lava textures are not loaded from any files
@@ -482,8 +478,6 @@ def load_water():
     lavablock = _build_block(lavatexture, lavatexture)
     blockmap[10] = lavablock.convert("RGB"), lavablock
     blockmap[11] = blockmap[10]
-load_water()
-
 
 def generate_special_texture(blockID, data):
     """Generates a special texture, such as a correctly facing minecraft track"""
@@ -1541,11 +1535,6 @@ def tintTexture(im, c):
     i.putalpha(im.split()[3]); # copy the alpha band back in. assuming RGBA
     return i
 
-# generate biome (still grayscale) leaf, grass textures
-biome_grass_texture = _build_block(terrain_images[0], terrain_images[38], 2)
-biome_leaf_texture = _build_block(terrain_images[52], terrain_images[52], 18)
-
-
 currentBiomeFile = None
 currentBiomeData = None
 grasscolor = None
@@ -1665,9 +1654,31 @@ special_map[2] = range(11) + [0x10,]  # grass, grass has not ancildata but is
                                       # and is harmless for normal maps
 special_map[18] = range(16) # leaves, birch, normal or pine leaves (not implemented)
 
+# placeholders that are generated in generate()
+terrain_images = None
+blockmap = None
+biome_grass_texture = None
+biome_leaf_texture = None
+specialblockmap = None
 
+def generate():
+    # This maps terainids to 16x16 images
+    global terrain_images
+    terrain_images = _split_terrain(_get_terrain_image())
+    
+    # generate the normal blocks
+    global blockmap
+    blockmap = _build_blockimages()
+    load_water()
+    
+    # generate biome (still grayscale) leaf, grass textures
+    global biome_grass_texture, biome_leaf_texture
+    biome_grass_texture = _build_block(terrain_images[0], terrain_images[38], 2)
+    biome_leaf_texture = _build_block(terrain_images[52], terrain_images[52], 18)
+    
+    # generate the special blocks
+    global specialblockmap, special_blocks
     specialblockmap = {}
-
     for blockID in special_blocks:
         for data in special_map[blockID]:
             specialblockmap[(blockID, data)] = generate_special_texture(blockID, data)