From 5b212dc58513fb05e3ea540b1e4b414d4c5d3d0b Mon Sep 17 00:00:00 2001
From: Wunkolo <Wunkolo@gmail.com>
Date: Tue, 25 Jun 2019 14:19:12 -0700
Subject: [PATCH] Implement standard C boolean type

---
 overviewer_core/src/iterate.c                 | 10 ++--
 overviewer_core/src/overviewer.h              |  6 +--
 overviewer_core/src/primitives/base.c         | 21 ++++----
 overviewer_core/src/primitives/cave.c         | 41 ++++++++-------
 overviewer_core/src/primitives/clear-base.c   |  6 +--
 .../src/primitives/depth-tinting.c            |  6 +--
 overviewer_core/src/primitives/depth.c        | 14 ++---
 overviewer_core/src/primitives/edge-lines.c   |  6 +--
 overviewer_core/src/primitives/exposed.c      | 32 ++++++------
 .../src/primitives/height-fading.c            |  6 +--
 overviewer_core/src/primitives/hide.c         | 22 ++++----
 overviewer_core/src/primitives/lighting.c     | 32 ++++++------
 overviewer_core/src/primitives/lighting.h     |  4 +-
 overviewer_core/src/primitives/nether.c       | 24 ++++-----
 overviewer_core/src/primitives/nether.h       |  4 +-
 overviewer_core/src/primitives/nether_old.c   | 14 ++---
 overviewer_core/src/primitives/no-fluids.c    |  6 +--
 .../src/primitives/overlay-biomes.c           | 16 +++---
 .../src/primitives/overlay-mineral.c          | 26 +++++-----
 .../src/primitives/overlay-slime.c            | 51 +++++++++----------
 .../src/primitives/overlay-spawn.c            |  8 +--
 .../src/primitives/overlay-structure.c        | 24 ++++-----
 overviewer_core/src/primitives/overlay.c      |  6 +--
 .../src/primitives/smooth-lighting.c          | 20 ++++----
 overviewer_core/src/rendermodes.c             | 18 +++----
 overviewer_core/src/rendermodes.h             | 18 +++----
 26 files changed, 216 insertions(+), 225 deletions(-)

diff --git a/overviewer_core/src/iterate.c b/overviewer_core/src/iterate.c
index 1241627..fbdb30b 100644
--- a/overviewer_core/src/iterate.c
+++ b/overviewer_core/src/iterate.c
@@ -121,14 +121,14 @@ static inline void load_chunk_section(ChunkData* dest, int32_t i, PyObject* sect
  * if required is true, failure to load the chunk will raise a python
  * exception and return true.
  */
-int32_t load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required) {
+bool load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required) {
     ChunkData* dest = &(state->chunks[1 + x][1 + z]);
     int32_t i;
     PyObject* chunk = NULL;
     PyObject* sections = NULL;
 
     if (dest->loaded)
-        return 0;
+        return false;
 
     /* set up reasonable defaults */
     dest->biomes = NULL;
@@ -150,7 +150,7 @@ int32_t load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required) {
         if (!required) {
             PyErr_Clear();
         }
-        return 1;
+        return true;
     }
 
     sections = PyDict_GetItemString(chunk, "Sections");
@@ -163,7 +163,7 @@ int32_t load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required) {
         if (!required) {
             PyErr_Clear();
         }
-        return 1;
+        return true;
     }
 
     dest->biomes = (PyArrayObject*)PyDict_GetItemString(chunk, "Biomes");
@@ -184,7 +184,7 @@ int32_t load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required) {
     Py_DECREF(sections);
     Py_DECREF(chunk);
 
-    return 0;
+    return false;
 }
 
 /* helper to unload all loaded chunks */
diff --git a/overviewer_core/src/overviewer.h b/overviewer_core/src/overviewer.h
index 08db185..690e7ed 100644
--- a/overviewer_core/src/overviewer.h
+++ b/overviewer_core/src/overviewer.h
@@ -121,7 +121,7 @@ typedef struct {
 } RenderState;
 PyObject* init_chunk_render(void);
 /* returns true on error, x,z relative */
-int32_t load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required);
+bool load_chunk(RenderState* state, int32_t x, int32_t z, uint8_t required);
 PyObject* chunk_render(PyObject* self, PyObject* args);
 typedef enum {
     KNOWN,
@@ -141,8 +141,8 @@ block_has_property(mc_block_t b, BlockProperty prop) {
     if (b >= max_blockid || !(block_properties[b] & (1 << KNOWN))) {
         /* block is unknown, return defaults */
         if (prop == TRANSPARENT)
-            return 1;
-        return 0;
+            return true;
+        return false;
     }
 
     return block_properties[b] & (1 << prop);
diff --git a/overviewer_core/src/primitives/base.c b/overviewer_core/src/primitives/base.c
index bb26dc2..982a694 100644
--- a/overviewer_core/src/primitives/base.c
+++ b/overviewer_core/src/primitives/base.c
@@ -28,12 +28,12 @@ typedef struct {
     PyObject* grass_texture;
 } PrimitiveBase;
 
-static int32_t
+static bool
 base_start(void* data, RenderState* state, PyObject* support) {
     PrimitiveBase* self = (PrimitiveBase*)data;
 
     if (!render_mode_parse_option(support, "biomes", "i", &(self->use_biomes)))
-        return 1;
+        return true;
 
     /* biome-compliant grass mask (includes sides!) */
     self->grass_texture = PyObject_GetAttrString(state->textures, "biome_grass_texture");
@@ -43,7 +43,7 @@ base_start(void* data, RenderState* state, PyObject* support) {
     self->grasscolor = PyObject_CallMethod(state->textures, "load_grass_color", "");
     self->watercolor = PyObject_CallMethod(state->textures, "load_water_color", "");
 
-    return 0;
+    return false;
 }
 
 static void
@@ -56,7 +56,7 @@ base_finish(void* data, RenderState* state) {
     Py_DECREF(self->grass_texture);
 }
 
-static int32_t
+static bool
 base_occluded(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     if ((x != 0) && (y != 15) && (z != 15) &&
         !render_mode_hidden(state->rendermode, x - 1, y, z) &&
@@ -65,10 +65,10 @@ base_occluded(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
         !is_transparent(getArrayShort3D(state->blocks, x - 1, y, z)) &&
         !is_transparent(getArrayShort3D(state->blocks, x, y, z + 1)) &&
         !is_transparent(getArrayShort3D(state->blocks, x, y + 1, z))) {
-        return 1;
+        return true;
     }
 
-    return 0;
+    return false;
 }
 
 static void
@@ -110,7 +110,7 @@ base_draw(void* data, RenderState* state, PyObject* src, PyObject* mask, PyObjec
         PyObject* facemask = mask;
         uint8_t r = 255, g = 255, b = 255;
         PyObject* color_table = NULL;
-        uint8_t flip_xy = 0;
+        bool flip_xy = false;
 
         if (state->block == block_grass) {
             /* grass needs a special facemask */
@@ -122,11 +122,8 @@ base_draw(void* data, RenderState* state, PyObject* src, PyObject* mask, PyObjec
             color_table = self->watercolor;
         } else if (block_class_is_subset(state->block, (mc_block_t[]){block_leaves, block_leaves2}, 2)) {
             color_table = self->foliagecolor;
-            if (state->block_data == 2) {
-                /* birch!
-                   birch foliage color is flipped XY-ways */
-                flip_xy = 1;
-            }
+            /* birch foliage color is flipped XY-ways */
+            flip_xy = state->block_data == 2;
         }
 
         if (color_table) {
diff --git a/overviewer_core/src/primitives/cave.c b/overviewer_core/src/primitives/cave.c
index 576152b..49313a2 100644
--- a/overviewer_core/src/primitives/cave.c
+++ b/overviewer_core/src/primitives/cave.c
@@ -22,23 +22,22 @@ typedef struct {
     int32_t only_lit;
 } RenderPrimitiveCave;
 
-static inline int32_t
+static inline bool
 touches_light(RenderState* state, DataType type, uint32_t x, uint32_t y, uint32_t z) {
     if (get_data(state, type, x, y + 1, z))
-        return 1;
-
+        return true;
     if (get_data(state, type, x + 1, y, z))
-        return 1;
+        return true;
     if (get_data(state, type, x - 1, y, z))
-        return 1;
+        return true;
     if (get_data(state, type, x, y, z + 1))
-        return 1;
+        return true;
     if (get_data(state, type, x, y, z - 1))
-        return 1;
-    return 0;
+        return true;
+    return false;
 }
 
-static int32_t
+static bool
 cave_occluded(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     /* check for normal occlusion */
     /* use ajacent chunks, if not you get blocks spreaded in chunk edges */
@@ -46,21 +45,21 @@ cave_occluded(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     if (!is_known_transparent(get_data(state, BLOCKS, x - 1, y, z)) &&
         !is_known_transparent(get_data(state, BLOCKS, x, y, z + 1)) &&
         !is_known_transparent(get_data(state, BLOCKS, x, y + 1, z))) {
-        return 1;
+        return true;
     }
 
     /* special handling for section boundaries */
     if (x == 0 && (!(state->chunks[0][1].loaded) || state->chunks[0][1].sections[state->chunky].blocks == NULL))
-        return 1;
+        return true;
     if (y == 15 && (state->chunky + 1 >= SECTIONS_PER_CHUNK || state->chunks[1][1].sections[state->chunky + 1].blocks == NULL))
-        return 1;
+        return true;
     if (z == 15 && (!(state->chunks[1][2].loaded) || state->chunks[1][2].sections[state->chunky].blocks == NULL))
-        return 1;
+        return true;
 
-    return 0;
+    return false;
 }
 
-static int32_t
+static bool
 cave_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     RenderPrimitiveCave* self;
     int32_t dy = 0;
@@ -68,11 +67,11 @@ cave_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
 
     /* check if the block is touching skylight */
     if (touches_light(state, SKYLIGHT, x, y, z)) {
-        return 1;
+        return true;
     }
 
     if (self->only_lit && !touches_light(state, BLOCKLIGHT, x, y, z)) {
-        return 1;
+        return true;
     }
 
     /* check for lakes and seas and don't render them
@@ -85,7 +84,7 @@ cave_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
         for (dy = y + 1; dy < (SECTIONS_PER_CHUNK - state->chunky) * 16; dy++) {
             /* go up and check for skylight */
             if (get_data(state, SKYLIGHT, x, dy, z) != 0) {
-                return 1;
+                return true;
             }
             if (get_data(state, BLOCKS, x, dy, z) != 9) {
                 /* we are out of the water! and there's no skylight
@@ -102,15 +101,15 @@ cave_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     return cave_occluded(data, state, x, y, z);
 }
 
-static int32_t
+static bool
 cave_start(void* data, RenderState* state, PyObject* support) {
     RenderPrimitiveCave* self;
     self = (RenderPrimitiveCave*)data;
 
     if (!render_mode_parse_option(support, "only_lit", "i", &(self->only_lit)))
-        return 1;
+        return true;
 
-    return 0;
+    return false;
 }
 
 RenderPrimitiveInterface primitive_cave = {
diff --git a/overviewer_core/src/primitives/clear-base.c b/overviewer_core/src/primitives/clear-base.c
index 4ab0a30..f0abff0 100644
--- a/overviewer_core/src/primitives/clear-base.c
+++ b/overviewer_core/src/primitives/clear-base.c
@@ -17,7 +17,7 @@
 
 #include "../overviewer.h"
 
-static int32_t
+static bool
 clear_base_occluded(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     if ((x != 0) && (y != 15) && (z != 127) &&
         !render_mode_hidden(state->rendermode, x - 1, y, z) &&
@@ -26,10 +26,10 @@ clear_base_occluded(void* data, RenderState* state, int32_t x, int32_t y, int32_
         !is_transparent(getArrayShort3D(state->blocks, x - 1, y, z)) &&
         !is_transparent(getArrayShort3D(state->blocks, x, y, z + 1)) &&
         !is_transparent(getArrayShort3D(state->blocks, x, y + 1, z))) {
-        return 1;
+        return true;
     }
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/depth-tinting.c b/overviewer_core/src/primitives/depth-tinting.c
index d293e32..b6eefc3 100644
--- a/overviewer_core/src/primitives/depth-tinting.c
+++ b/overviewer_core/src/primitives/depth-tinting.c
@@ -23,16 +23,16 @@ typedef struct {
     PyObject* depth_colors;
 } RenderPrimitiveDepthTinting;
 
-static int32_t
+static bool
 depth_tinting_start(void* data, RenderState* state, PyObject* support) {
     RenderPrimitiveDepthTinting* self;
     self = (RenderPrimitiveDepthTinting*)data;
 
     self->depth_colors = PyObject_GetAttrString(support, "depth_colors");
     if (self->depth_colors == NULL)
-        return 1;
+        return true;
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/depth.c b/overviewer_core/src/primitives/depth.c
index 71c3f77..5f9eb4a 100644
--- a/overviewer_core/src/primitives/depth.c
+++ b/overviewer_core/src/primitives/depth.c
@@ -22,26 +22,26 @@ typedef struct {
     uint32_t max;
 } PrimitiveDepth;
 
-static int32_t
+static bool
 depth_start(void* data, RenderState* state, PyObject* support) {
     PrimitiveDepth* self = (PrimitiveDepth*)data;
 
     if (!render_mode_parse_option(support, "min", "I", &(self->min)))
-        return 1;
+        return true;
     if (!render_mode_parse_option(support, "max", "I", &(self->max)))
-        return 1;
+        return true;
 
-    return 0;
+    return false;
 }
 
-static int32_t
+static bool
 depth_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     PrimitiveDepth* self = (PrimitiveDepth*)data;
     y += 16 * state->chunky;
     if (y > self->max || y < self->min) {
-        return 1;
+        return true;
     }
-    return 0;
+    return false;
 }
 
 RenderPrimitiveInterface primitive_depth = {
diff --git a/overviewer_core/src/primitives/edge-lines.c b/overviewer_core/src/primitives/edge-lines.c
index 7e88644..52e3f7b 100644
--- a/overviewer_core/src/primitives/edge-lines.c
+++ b/overviewer_core/src/primitives/edge-lines.c
@@ -23,12 +23,12 @@ typedef struct {
     float opacity;
 } PrimitiveEdgeLines;
 
-static int32_t
+static bool
 edge_lines_start(void* data, RenderState* state, PyObject* support) {
     PrimitiveEdgeLines* self = (PrimitiveEdgeLines*)data;
     if (!render_mode_parse_option(support, "opacity", "f", &(self->opacity)))
-        return 1;
-    return 0;
+        return true;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/exposed.c b/overviewer_core/src/primitives/exposed.c
index c902d0b..740fc21 100644
--- a/overviewer_core/src/primitives/exposed.c
+++ b/overviewer_core/src/primitives/exposed.c
@@ -21,29 +21,29 @@ typedef struct {
     uint32_t mode; /* 0 = exposed only, 1 = unexposed only */
 } PrimitiveExposed;
 
-static int32_t
+static bool
 exposed_start(void* data, RenderState* state, PyObject* support) {
     PrimitiveExposed* self = (PrimitiveExposed*)data;
 
     if (!render_mode_parse_option(support, "mode", "I", &(self->mode)))
-        return 1;
+        return true;
 
-    return 0;
+    return false;
 }
 
-static int32_t
+static bool
 exposed_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     PrimitiveExposed* self = (PrimitiveExposed*)data;
 
     /* Unset these flags if seeming exposure from any of these directions would
      * be due to not having data there.
      */
-    int32_t validMinusX = 1;
-    int32_t validPlusX = 1;
-    int32_t validMinusY = 1;
-    int32_t validPlusY = 1;
-    int32_t validMinusZ = 1;
-    int32_t validPlusZ = 1;
+    bool validMinusX = true;
+    bool validPlusX = true;
+    bool validMinusY = true;
+    bool validPlusY = true;
+    bool validMinusZ = true;
+    bool validPlusZ = true;
 
     /* special handling for section boundaries */
     /* If the neighboring section has no block data, ignore exposure from that
@@ -51,32 +51,32 @@ exposed_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z)
      */
     if (x == 0 && (!(state->chunks[0][1].loaded) || state->chunks[0][1].sections[state->chunky].blocks == NULL)) {
         /* No data in -x direction */
-        validMinusX = 0;
+        validMinusX = false;
     }
 
     if (x == 15 && (!(state->chunks[2][1].loaded) || state->chunks[2][1].sections[state->chunky].blocks == NULL)) {
         /* No data in +x direction */
-        validPlusX = 0;
+        validPlusX = false;
     }
 
     if (y == 0 && (state->chunky - 1 < 0 || state->chunks[1][1].sections[state->chunky - 1].blocks == NULL)) {
         /* No data in -y direction */
-        validMinusY = 0;
+        validMinusY = false;
     }
 
     if (y == 15 && (state->chunky + 1 >= SECTIONS_PER_CHUNK || state->chunks[1][1].sections[state->chunky + 1].blocks == NULL)) {
         /* No data in +y direction */
-        validPlusY = 0;
+        validPlusY = false;
     }
 
     if (z == 0 && (!(state->chunks[1][0].loaded) || state->chunks[1][0].sections[state->chunky].blocks == NULL)) {
         /* No data in -z direction */
-        validMinusZ = 0;
+        validMinusZ = false;
     }
 
     if (z == 15 && (!(state->chunks[1][2].loaded) || state->chunks[1][2].sections[state->chunky].blocks == NULL)) {
         /* No data in +z direction */
-        validPlusZ = 0;
+        validPlusZ = false;
     }
 
     /* If any of the 6 blocks adjacent to us are transparent, we're exposed */
diff --git a/overviewer_core/src/primitives/height-fading.c b/overviewer_core/src/primitives/height-fading.c
index d6b9a15..10f6e3c 100644
--- a/overviewer_core/src/primitives/height-fading.c
+++ b/overviewer_core/src/primitives/height-fading.c
@@ -23,17 +23,17 @@ typedef struct {
     uint32_t sealevel;
 } PrimitiveHeightFading;
 
-static int32_t
+static bool
 height_fading_start(void* data, RenderState* state, PyObject* support) {
     PrimitiveHeightFading* self = (PrimitiveHeightFading*)data;
 
     if (!render_mode_parse_option(support, "sealevel", "I", &(self->sealevel)))
-        return 1;
+        return true;
 
     self->black_color = PyObject_GetAttrString(support, "black_color");
     self->white_color = PyObject_GetAttrString(support, "white_color");
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/hide.c b/overviewer_core/src/primitives/hide.c
index ff6962f..29c6d7a 100644
--- a/overviewer_core/src/primitives/hide.c
+++ b/overviewer_core/src/primitives/hide.c
@@ -28,26 +28,26 @@ typedef struct {
     struct HideRule* rules;
 } RenderPrimitiveHide;
 
-static int32_t
+static bool
 hide_start(void* data, RenderState* state, PyObject* support) {
     PyObject* opt;
     RenderPrimitiveHide* self = (RenderPrimitiveHide*)data;
     self->rules = NULL;
 
     if (!render_mode_parse_option(support, "blocks", "O", &(opt)))
-        return 1;
+        return true;
     if (opt && opt != Py_None) {
         Py_ssize_t blocks_size = 0, i;
 
         if (!PyList_Check(opt)) {
             PyErr_SetString(PyExc_TypeError, "'blocks' must be a list");
-            return 1;
+            return true;
         }
 
         blocks_size = PyList_GET_SIZE(opt);
         self->rules = calloc(blocks_size + 1, sizeof(struct HideRule));
         if (self->rules == NULL) {
-            return 1;
+            return true;
         }
 
         for (i = 0; i < blocks_size; i++) {
@@ -64,12 +64,12 @@ hide_start(void* data, RenderState* state, PyObject* support) {
                 /* format not recognized */
                 free(self->rules);
                 self->rules = NULL;
-                return 1;
+                return true;
             }
         }
     }
 
-    return 0;
+    return false;
 }
 
 static void
@@ -81,14 +81,14 @@ hide_finish(void* data, RenderState* state) {
     }
 }
 
-static int32_t
+static bool
 hide_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     RenderPrimitiveHide* self = (RenderPrimitiveHide*)data;
     uint32_t i;
     mc_block_t block;
 
     if (self->rules == NULL)
-        return 0;
+        return false;
 
     block = get_data(state, BLOCKS, x, y, z);
     for (i = 0; self->rules[i].blockid != block_air; i++) {
@@ -96,15 +96,15 @@ hide_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
             uint8_t data;
 
             if (!(self->rules[i].has_data))
-                return 1;
+                return true;
 
             data = get_data(state, DATA, x, y, z);
             if (data == self->rules[i].data)
-                return 1;
+                return true;
         }
     }
 
-    return 0;
+    return false;
 }
 
 RenderPrimitiveInterface primitive_hide = {
diff --git a/overviewer_core/src/primitives/lighting.c b/overviewer_core/src/primitives/lighting.c
index b3eec15..f4e61fd 100644
--- a/overviewer_core/src/primitives/lighting.c
+++ b/overviewer_core/src/primitives/lighting.c
@@ -99,7 +99,7 @@ calculate_light_color_fancy_night(void* data,
 
 uint8_t
 estimate_blocklevel(RenderPrimitiveLighting* self, RenderState* state,
-                    int32_t x, int32_t y, int32_t z, int* authoratative) {
+                    int32_t x, int32_t y, int32_t z, bool* authoratative) {
 
     /* placeholders for later data arrays, coordinates */
     mc_block_t block;
@@ -108,12 +108,12 @@ estimate_blocklevel(RenderPrimitiveLighting* self, RenderState* state,
 
     /* defaults to "guess" until told otherwise */
     if (authoratative)
-        *authoratative = 0;
+        *authoratative = false;
 
     block = get_data(state, BLOCKS, x, y, z);
 
     if (authoratative == NULL) {
-        int32_t auth;
+        bool auth;
 
         /* iterate through all surrounding blocks to take an average */
         int32_t dx, dy, dz, local_block;
@@ -196,15 +196,15 @@ get_lighting_color(RenderPrimitiveLighting* self, RenderState* state,
 }
 
 /* does per-face occlusion checking for do_shading_with_mask */
-inline int32_t
-lighting_is_face_occluded(RenderState* state, int32_t skip_sides, int32_t x, int32_t y, int32_t z) {
+inline bool
+lighting_is_face_occluded(RenderState* state, bool skip_sides, int32_t x, int32_t y, int32_t z) {
     /* first, check for occlusion if the block is in the local chunk */
     if (x >= 0 && x < 16 && y >= 0 && y < 16 && z >= 0 && z < 16) {
         mc_block_t block = getArrayShort3D(state->blocks, x, y, z);
 
         if (!is_transparent(block) && !render_mode_hidden(state->rendermode, x, y, z)) {
             /* this face isn't visible, so don't draw anything */
-            return 1;
+            return true;
         }
     } else if (!skip_sides) {
         mc_block_t block = get_data(state, BLOCKS, x, y, z);
@@ -213,10 +213,10 @@ lighting_is_face_occluded(RenderState* state, int32_t skip_sides, int32_t x, int
                ugly black doted line between chunks in night rendermode.
                This wouldn't be necessary if the textures were truly
                tessellate-able */
-            return 1;
+            return true;
         }
     }
-    return 0;
+    return false;
 }
 
 /* shades the drawn block with the given facemask, based on the
@@ -247,14 +247,14 @@ lighting_start(void* data, RenderState* state, PyObject* support) {
     self = (RenderPrimitiveLighting*)data;
 
     /* don't skip sides by default */
-    self->skip_sides = 0;
+    self->skip_sides = false;
 
     if (!render_mode_parse_option(support, "strength", "f", &(self->strength)))
-        return 1;
-    if (!render_mode_parse_option(support, "night", "i", &(self->night)))
-        return 1;
-    if (!render_mode_parse_option(support, "color", "i", &(self->color)))
-        return 1;
+        return true;
+    if (!render_mode_parse_option(support, "night", "p", &(self->night)))
+        return true;
+    if (!render_mode_parse_option(support, "color", "p", &(self->color)))
+        return true;
 
     self->facemasks_py = PyObject_GetAttrString(support, "facemasks");
     // borrowed references, don't need to be decref'd
@@ -273,7 +273,7 @@ lighting_start(void* data, RenderState* state, PyObject* support) {
         if (self->lightcolor == Py_None) {
             Py_DECREF(self->lightcolor);
             self->lightcolor = NULL;
-            self->color = 0;
+            self->color = false;
         } else {
             if (self->night) {
                 self->calculate_light_color = calculate_light_color_fancy_night;
@@ -285,7 +285,7 @@ lighting_start(void* data, RenderState* state, PyObject* support) {
         self->lightcolor = NULL;
     }
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/lighting.h b/overviewer_core/src/primitives/lighting.h
index 08550f9..009adfc 100644
--- a/overviewer_core/src/primitives/lighting.h
+++ b/overviewer_core/src/primitives/lighting.h
@@ -31,7 +31,7 @@ typedef struct {
     /* can be set to 0 in derived modes to indicate that lighting the chunk
      * sides is actually important. Right now, this is used in cave mode
      */
-    int32_t skip_sides;
+    bool skip_sides;
 
     float strength;
     int32_t color;
@@ -40,7 +40,7 @@ typedef struct {
 
 /* exposed so that smooth-lighting can use them */
 extern RenderPrimitiveInterface primitive_lighting;
-int32_t lighting_is_face_occluded(RenderState* state, int32_t skip_sides, int32_t x, int32_t y, int32_t z);
+bool lighting_is_face_occluded(RenderState* state, bool skip_sides, int32_t x, int32_t y, int32_t z);
 void get_lighting_color(RenderPrimitiveLighting* self, RenderState* state,
                         int32_t x, int32_t y, int32_t z,
                         uint8_t* r, uint8_t* g, uint8_t* b);
diff --git a/overviewer_core/src/primitives/nether.c b/overviewer_core/src/primitives/nether.c
index a757620..9ef0299 100644
--- a/overviewer_core/src/primitives/nether.c
+++ b/overviewer_core/src/primitives/nether.c
@@ -23,31 +23,31 @@
 static void
 walk_chunk(RenderState* state, RenderPrimitiveNether* data) {
     int32_t x, y, z;
-    int32_t id;
+    mc_block_t blockid;
 
     for (x = -1; x < WIDTH + 1; x++) {
         for (z = -1; z < DEPTH + 1; z++) {
-            id = get_data(state, BLOCKS, x, NETHER_ROOF - (state->chunky * 16), z);
-            if (id == block_bedrock) {
-                data->remove_block[x + 1][NETHER_ROOF][z + 1] = 1;
-                id = get_data(state, BLOCKS, x, (NETHER_ROOF + 1) - (state->chunky * 16), z);
-                if (id == block_brown_mushroom || id == block_red_mushroom)
-                    data->remove_block[x + 1][NETHER_ROOF + 1][z + 1] = 1;
+            blockid = get_data(state, BLOCKS, x, NETHER_ROOF - (state->chunky * 16), z);
+            if (blockid == block_bedrock) {
+                data->remove_block[x + 1][NETHER_ROOF][z + 1] = true;
+                blockid = get_data(state, BLOCKS, x, (NETHER_ROOF + 1) - (state->chunky * 16), z);
+                if (blockid == block_brown_mushroom || blockid == block_red_mushroom)
+                    data->remove_block[x + 1][NETHER_ROOF + 1][z + 1] = true;
             }
 
             for (y = NETHER_ROOF - 1; y >= 0; y--) {
-                id = get_data(state, BLOCKS, x, y - (state->chunky * 16), z);
-                if (block_class_is_subset(id, (mc_block_t[]){block_bedrock, block_netherrack, block_quartz_ore, block_lava}, 4))
-                    data->remove_block[x + 1][y][z + 1] = 1;
+                blockid = get_data(state, BLOCKS, x, y - (state->chunky * 16), z);
+                if (block_class_is_subset(blockid, (mc_block_t[]){block_bedrock, block_netherrack, block_quartz_ore, block_lava}, 4))
+                    data->remove_block[x + 1][y][z + 1] = true;
                 else
                     break;
             }
         }
     }
-    data->walked_chunk = 1;
+    data->walked_chunk = true;
 }
 
-static int32_t
+static bool
 nether_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     RenderPrimitiveNether* self;
     int32_t real_y;
diff --git a/overviewer_core/src/primitives/nether.h b/overviewer_core/src/primitives/nether.h
index abfbd56..4e27025 100644
--- a/overviewer_core/src/primitives/nether.h
+++ b/overviewer_core/src/primitives/nether.h
@@ -25,8 +25,8 @@
 // add two to these because the primative functions should expect to
 // deal with x and z values of -1 and 16
 typedef struct {
-    int32_t walked_chunk;
+    bool walked_chunk;
 
-    int32_t remove_block[WIDTH + 2][HEIGHT][DEPTH + 2];
+    bool remove_block[WIDTH + 2][HEIGHT][DEPTH + 2];
 
 } RenderPrimitiveNether;
diff --git a/overviewer_core/src/primitives/nether_old.c b/overviewer_core/src/primitives/nether_old.c
index 4466751..59e2c68 100644
--- a/overviewer_core/src/primitives/nether_old.c
+++ b/overviewer_core/src/primitives/nether_old.c
@@ -17,33 +17,33 @@
 
 #include "../overviewer.h"
 
-static int32_t
+static bool
 netherold_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     /* hide all blocks above all air blocks
        
        due to how the nether is currently generated, this will also count
        empty sections as 'solid'
     */
-    uint8_t missing_section = 0;
+    bool missing_section = false;
     while (y < (SECTIONS_PER_CHUNK - state->chunky) * 16) {
         if (state->chunks[1][1].sections[state->chunky + (y / 16)].blocks == NULL) {
-            missing_section = 1;
+            missing_section = true;
             y += 16;
             continue;
         } else {
             /* if we passed through a missing section, but now are back in,
                that counts as air */
             if (missing_section)
-                return 0;
-            missing_section = 0;
+                return false;
+            missing_section = true;
         }
 
         if (!missing_section && get_data(state, BLOCKS, x, y, z) == 0) {
-            return 0;
+            return false;
         }
         y++;
     }
-    return 1;
+    return true;
 }
 
 RenderPrimitiveInterface primitive_nether_old = {
diff --git a/overviewer_core/src/primitives/no-fluids.c b/overviewer_core/src/primitives/no-fluids.c
index fae845a..7401fc1 100644
--- a/overviewer_core/src/primitives/no-fluids.c
+++ b/overviewer_core/src/primitives/no-fluids.c
@@ -17,12 +17,12 @@
 
 #include "../overviewer.h"
 
-static int32_t
+static bool
 no_fluids_start(void* data, RenderState* state, PyObject* support) {
-    return 0;
+    return false;
 }
 
-static int32_t
+static bool
 no_fluids_hidden(void* data, RenderState* state, int32_t x, int32_t y, int32_t z) {
     return block_has_property(state->block, FLUID);
 }
diff --git a/overviewer_core/src/primitives/overlay-biomes.c b/overviewer_core/src/primitives/overlay-biomes.c
index 5ed7377..ab6df13 100644
--- a/overviewer_core/src/primitives/overlay-biomes.c
+++ b/overviewer_core/src/primitives/overlay-biomes.c
@@ -110,15 +110,15 @@ static void get_color(void* data, RenderState* state,
     }
 }
 
-static int32_t
+static bool
 overlay_biomes_start(void* data, RenderState* state, PyObject* support) {
     PyObject* opt;
     RenderPrimitiveBiomes* self;
     uint8_t alpha_tmp = 0;
 
     /* first, chain up */
-    int32_t ret = primitive_overlay.start(data, state, support);
-    if (ret != 0)
+    bool ret = primitive_overlay.start(data, state, support);
+    if (ret != false)
         return ret;
 
     /* now do custom initializations */
@@ -126,7 +126,7 @@ overlay_biomes_start(void* data, RenderState* state, PyObject* support) {
 
     // opt is a borrowed reference.  do not deref
     if (!render_mode_parse_option(support, "biomes", "O", &(opt)))
-        return 1;
+        return true;
     if (opt && opt != Py_None) {
         struct BiomeColor* biomes = NULL;
         Py_ssize_t biomes_size = 0, i;
@@ -134,13 +134,13 @@ overlay_biomes_start(void* data, RenderState* state, PyObject* support) {
 
         if (!PyList_Check(opt)) {
             PyErr_SetString(PyExc_TypeError, "'biomes' must be a list");
-            return 1;
+            return true;
         }
 
         biomes_size = PyList_GET_SIZE(opt);
         biomes = self->biomes = calloc(biomes_size + 1, sizeof(struct BiomeColor));
         if (biomes == NULL) {
-            return 1;
+            return true;
         }
 
         for (i = 0; i < biomes_size; i++) {
@@ -151,7 +151,7 @@ overlay_biomes_start(void* data, RenderState* state, PyObject* support) {
             if (!PyArg_ParseTuple(biome, "s(bbb)", &tmpname, &(biomes[i].r), &(biomes[i].g), &(biomes[i].b))) {
                 free(biomes);
                 self->biomes = NULL;
-                return 1;
+                return true;
             }
 
             //printf("%s, (%d, %d, %d) ->", tmpname, biomes[i].r, biomes[i].g, biomes[i].b);
@@ -181,7 +181,7 @@ overlay_biomes_start(void* data, RenderState* state, PyObject* support) {
     /* setup custom color */
     self->parent.get_color = get_color;
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/overlay-mineral.c b/overviewer_core/src/primitives/overlay-mineral.c
index c9a53a7..c151d52 100644
--- a/overviewer_core/src/primitives/overlay-mineral.c
+++ b/overviewer_core/src/primitives/overlay-mineral.c
@@ -26,7 +26,7 @@ typedef struct {
 } RenderPrimitiveMineral;
 
 struct MineralColor {
-    uint8_t blockid;
+    mc_block_t block;
     uint8_t r, g, b;
 };
 
@@ -59,10 +59,10 @@ static void get_color(void* data, RenderState* state,
     y_max = state->y + 1;
     for (y = state->chunky * -16; y <= y_max; y++) {
         int32_t i, tmp;
-        mc_block_t blockid = get_data(state, BLOCKS, x, y, z);
+        mc_block_t block = get_data(state, BLOCKS, x, y, z);
 
-        for (i = 0; (max_i == -1 || i < max_i) && minerals[i].blockid != block_air; i++) {
-            if (minerals[i].blockid == blockid) {
+        for (i = 0; (max_i == -1 || i < max_i) && minerals[i].block != block_air; i++) {
+            if (minerals[i].block == block) {
                 *r = minerals[i].r;
                 *g = minerals[i].g;
                 *b = minerals[i].b;
@@ -77,14 +77,14 @@ static void get_color(void* data, RenderState* state,
     }
 }
 
-static int32_t
+static bool
 overlay_mineral_start(void* data, RenderState* state, PyObject* support) {
     PyObject* opt;
     RenderPrimitiveMineral* self;
 
     /* first, chain up */
-    int32_t ret = primitive_overlay.start(data, state, support);
-    if (ret != 0)
+    bool ret = primitive_overlay.start(data, state, support);
+    if (ret != false)
         return ret;
 
     /* now do custom initializations */
@@ -92,7 +92,7 @@ overlay_mineral_start(void* data, RenderState* state, PyObject* support) {
 
     // opt is a borrowed reference.  do not deref
     if (!render_mode_parse_option(support, "minerals", "O", &(opt)))
-        return 1;
+        return true;
     if (opt && opt != Py_None) {
         struct MineralColor* minerals = NULL;
         Py_ssize_t minerals_size = 0, i;
@@ -100,21 +100,21 @@ overlay_mineral_start(void* data, RenderState* state, PyObject* support) {
 
         if (!PyList_Check(opt)) {
             PyErr_SetString(PyExc_TypeError, "'minerals' must be a list");
-            return 1;
+            return true;
         }
 
         minerals_size = PyList_GET_SIZE(opt);
         minerals = self->minerals = calloc(minerals_size + 1, sizeof(struct MineralColor));
         if (minerals == NULL) {
-            return 1;
+            return true;
         }
 
         for (i = 0; i < minerals_size; i++) {
             PyObject* mineral = PyList_GET_ITEM(opt, i);
-            if (!PyArg_ParseTuple(mineral, "b(bbb)", &(minerals[i].blockid), &(minerals[i].r), &(minerals[i].g), &(minerals[i].b))) {
+            if (!PyArg_ParseTuple(mineral, "b(bbb)", &(minerals[i].block), &(minerals[i].r), &(minerals[i].g), &(minerals[i].b))) {
                 free(minerals);
                 self->minerals = NULL;
-                return 1;
+                return true;
             }
         }
     } else {
@@ -124,7 +124,7 @@ overlay_mineral_start(void* data, RenderState* state, PyObject* support) {
     /* setup custom color */
     self->parent.get_color = get_color;
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/overlay-slime.c b/overviewer_core/src/primitives/overlay-slime.c
index 7cbdf21..f897592 100644
--- a/overviewer_core/src/primitives/overlay-slime.c
+++ b/overviewer_core/src/primitives/overlay-slime.c
@@ -21,7 +21,7 @@
 typedef struct {
     /* inherits from overlay */
     RenderPrimitiveOverlay parent;
-    long long seed; // needs to be at least 64-bits
+    int64_t seed; // needs to be at least 64-bits
 } RenderPrimitiveSlime;
 
 /*
@@ -30,43 +30,38 @@ typedef struct {
  * http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Random.html
  */
 
-static void random_set_seed(long long* seed, long long new_seed) {
+static void random_set_seed(int64_t* seed, int64_t new_seed) {
     *seed = (new_seed ^ 0x5deece66dLL) & ((1LL << 48) - 1);
 }
 
-static int32_t random_next(long long* seed, int32_t bits) {
+static int64_t random_next(int64_t* seed, int32_t bits) {
     *seed = (*seed * 0x5deece66dLL + 0xbL) & ((1LL << 48) - 1);
-    return (int)(*seed >> (48 - bits));
+    return (int64_t)(*seed >> (48 - bits));
 }
 
-static int32_t random_next_int(long long* seed, int32_t n) {
-    int32_t bits, val;
+static int64_t random_next_int(int64_t* seed, uint32_t modulo) {
+    int64_t bits, val;
 
-    if (n <= 0) {
-        /* invalid */
-        return 0;
-    }
-
-    if ((n & -n) == n) {
-        /* n is a power of two */
-        return (int)((n * (long long)random_next(seed, 31)) >> 31);
+    if ((modulo & -modulo) == modulo) {
+        /* modulo is a power of two */
+        return (int64_t)((modulo * (int64_t)random_next(seed, 31)) >> 31);
     }
 
     do {
         bits = random_next(seed, 31);
-        val = bits % n;
-    } while (bits - val + (n - 1) < 0);
+        val = bits % modulo;
+    } while (bits - val + (modulo - 1) < 0);
     return val;
 }
 
-static int32_t is_slime(long long map_seed, int32_t chunkx, int32_t chunkz) {
+static bool is_slime(int64_t map_seed, int32_t chunkx, int32_t chunkz) {
     /* lots of magic numbers, but they're all correct! I swear! */
-    long long seed;
+    int64_t seed;
     random_set_seed(&seed, (map_seed +
-                            (long long)(chunkx * chunkx * 0x4c1906) +
-                            (long long)(chunkx * 0x5ac0db) +
-                            (long long)(chunkz * chunkz * 0x4307a7LL) +
-                            (long long)(chunkz * 0x5f24f)) ^
+                            (int64_t)(chunkx * chunkx * 0x4c1906) +
+                            (int64_t)(chunkx * 0x5ac0db) +
+                            (int64_t)(chunkz * chunkz * 0x4307a7LL) +
+                            (int64_t)(chunkz * 0x5f24f)) ^
                                0x3ad8025f);
     return (random_next_int(&seed, 10) == 0);
 }
@@ -89,14 +84,14 @@ static void get_color(void* data, RenderState* state,
     }
 }
 
-static int32_t
+static bool
 overlay_slime_start(void* data, RenderState* state, PyObject* support) {
     RenderPrimitiveSlime* self;
     PyObject* pyseed;
 
     /* first, chain up */
-    int32_t ret = primitive_overlay.start(data, state, support);
-    if (ret != 0)
+    bool ret = primitive_overlay.start(data, state, support);
+    if (ret != false)
         return ret;
 
     /* now do custom initializations */
@@ -110,13 +105,13 @@ overlay_slime_start(void* data, RenderState* state, PyObject* support) {
 
     pyseed = PyObject_GetAttrString(state->world, "seed");
     if (!pyseed)
-        return 1;
+        return true;
     self->seed = PyLong_AsLongLong(pyseed);
     Py_DECREF(pyseed);
     if (PyErr_Occurred())
-        return 1;
+        return true;
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/overlay-spawn.c b/overviewer_core/src/primitives/overlay-spawn.c
index 503fbd1..5cca5e1 100644
--- a/overviewer_core/src/primitives/overlay-spawn.c
+++ b/overviewer_core/src/primitives/overlay-spawn.c
@@ -55,13 +55,13 @@ static void get_color(void* data, RenderState* state,
     }
 }
 
-static int32_t
+static bool
 overlay_spawn_start(void* data, RenderState* state, PyObject* support) {
     RenderPrimitiveSpawn* self;
 
     /* first, chain up */
-    int32_t ret = primitive_overlay.start(data, state, support);
-    if (ret != 0)
+    bool ret = primitive_overlay.start(data, state, support);
+    if (ret != false)
         return ret;
 
     /* now do custom initializations */
@@ -73,7 +73,7 @@ overlay_spawn_start(void* data, RenderState* state, PyObject* support) {
     self->parent.default_color.b = 38;
     self->parent.default_color.a = 0;
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/overlay-structure.c b/overviewer_core/src/primitives/overlay-structure.c
index 1ea7cea..a8561c1 100644
--- a/overviewer_core/src/primitives/overlay-structure.c
+++ b/overviewer_core/src/primitives/overlay-structure.c
@@ -83,7 +83,7 @@ static void get_color(void* data,
     return;
 }
 
-static int32_t overlay_structure_start(void* data, RenderState* state, PyObject* support) {
+static bool overlay_structure_start(void* data, RenderState* state, PyObject* support) {
     /**
      * Initializing the search for structures by parsing the arguments and storing them into
      * appropriate structures. If no arguments are passed create and use default values.
@@ -92,8 +92,8 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
     RenderPrimitiveStructure* self;
 
     /* first, chain up */
-    int32_t ret = primitive_overlay.start(data, state, support);
-    if (ret != 0)
+    bool ret = primitive_overlay.start(data, state, support);
+    if (ret != false)
         return ret;
 
     /* now do custom initializations */
@@ -102,7 +102,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
     // opt is a borrowed reference.  do not deref
     // store the structures python object into opt.
     if (!render_mode_parse_option(support, "structures", "O", &(opt)))
-        return 1;
+        return true;
 
     /**
      * Check if a sane option was passed.
@@ -116,7 +116,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
         opt = PySequence_Fast(opt, "expected a sequence");
         if (!opt) {
             PyErr_SetString(PyExc_TypeError, "'structures' must be a a sequence");
-            return 1;
+            return true;
         }
 
         structures_size = PySequence_Fast_GET_SIZE(opt);
@@ -125,7 +125,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
         self->numcolors = structures_size;
         if (structures == NULL) {
             PyErr_SetString(PyExc_MemoryError, "failed to allocate memory");
-            return 1;
+            return true;
         }
 
         /**
@@ -144,7 +144,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
                     // Exception set automatically
                     free(structures);
                     self->structures = NULL;
-                    return 1;
+                    return true;
                 }
 
                 // Parse colorpy into a c-struct.
@@ -155,7 +155,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
                                       &structures[i].a)) {
                     free(structures);
                     self->structures = NULL;
-                    return 1;
+                    return true;
                 }
 
                 // Convert condspy to a fast sequence
@@ -163,7 +163,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
                 if (condspy == NULL) {
                     free(structures);
                     self->structures = NULL;
-                    return 1;
+                    return true;
                 }
 
                 // get the number of conditions.
@@ -176,7 +176,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
                     PyErr_SetString(PyExc_MemoryError, "failed to allocate memory");
                     free(structures);
                     self->structures = NULL;
-                    return 1;
+                    return true;
                 }
 
                 // iterate over all the conditions and read them.
@@ -193,7 +193,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
                         }
                         free(structures);
                         self->structures = NULL;
-                        return 1;
+                        return true;
                     }
                 }
             }
@@ -203,7 +203,7 @@ static int32_t overlay_structure_start(void* data, RenderState* state, PyObject*
     /* setup custom color */
     self->parent.get_color = get_color;
 
-    return 0;
+    return false;
 }
 
 static void overlay_structure_finish(void* data, RenderState* state) {
diff --git a/overviewer_core/src/primitives/overlay.c b/overviewer_core/src/primitives/overlay.c
index 252626c..ed42e6f 100644
--- a/overviewer_core/src/primitives/overlay.c
+++ b/overviewer_core/src/primitives/overlay.c
@@ -41,7 +41,7 @@ overlay_start(void* data, RenderState* state, PyObject* support) {
     color = self->color = calloc(1, sizeof(OverlayColor));
 
     if (color == NULL) {
-        return 1;
+        return true;
     }
 
     self->default_color.r = 200;
@@ -58,12 +58,12 @@ overlay_start(void* data, RenderState* state, PyObject* support) {
         if (render_mode_parse_option(support, "overlay_color", "O", &(opt))) {
             // If it is an object, check to see if it is None, if it is, use the default.
             if (opt && opt != Py_None) {
-                return 1;
+                return true;
             }
         }
     }
 
-    return 0;
+    return false;
 }
 
 static void
diff --git a/overviewer_core/src/primitives/smooth-lighting.c b/overviewer_core/src/primitives/smooth-lighting.c
index be7d905..7f50c56 100644
--- a/overviewer_core/src/primitives/smooth-lighting.c
+++ b/overviewer_core/src/primitives/smooth-lighting.c
@@ -181,13 +181,13 @@ do_shading_with_rule(RenderPrimitiveSmoothLighting* self, RenderState* state, st
                   x, y, NULL, 0);
 }
 
-static int32_t
+static bool
 smooth_lighting_start(void* data, RenderState* state, PyObject* support) {
     /* first, chain up */
-    int32_t ret = primitive_lighting.start(data, state, support);
-    if (ret != 0)
+    bool ret = primitive_lighting.start(data, state, support);
+    if (ret != false)
         return ret;
-    return 0;
+    return false;
 }
 
 static void
@@ -198,9 +198,9 @@ smooth_lighting_finish(void* data, RenderState* state) {
 
 static void
 smooth_lighting_draw(void* data, RenderState* state, PyObject* src, PyObject* mask, PyObject* mask_light) {
-    int32_t light_top = 1;
-    int32_t light_left = 1;
-    int32_t light_right = 1;
+    bool light_top   = true;
+    bool light_left  = true;
+    bool light_right = true;
     RenderPrimitiveSmoothLighting* self = (RenderPrimitiveSmoothLighting*)data;
 
     /* special case for leaves, water 8, water 9, ice 79
@@ -216,11 +216,11 @@ smooth_lighting_draw(void* data, RenderState* state, PyObject* src, PyObject* ma
     /* special code for water */
     if (state->block == block_water) {
         if (!(state->block_pdata & (1 << 4)))
-            light_top = 0;
+            light_top = false;
         if (!(state->block_pdata & (1 << 1)))
-            light_left = 0;
+            light_left = false;
         if (!(state->block_pdata & (1 << 2)))
-            light_right = 0;
+            light_right = false;
     }
 
     if (light_top)
diff --git a/overviewer_core/src/rendermodes.c b/overviewer_core/src/rendermodes.c
index 9cd6854..5118c28 100644
--- a/overviewer_core/src/rendermodes.c
+++ b/overviewer_core/src/rendermodes.c
@@ -129,9 +129,9 @@ void render_mode_destroy(RenderMode* self) {
     free(self);
 }
 
-int32_t render_mode_occluded(RenderMode* self, int32_t x, int32_t y, int32_t z) {
+bool render_mode_occluded(RenderMode* self, int32_t x, int32_t y, int32_t z) {
     uint32_t i;
-    int32_t occluded = 0;
+    bool occluded = false;
     for (i = 0; i < self->num_primitives; i++) {
         RenderPrimitive* prim = self->primitives[i];
         if (prim->iface->occluded) {
@@ -144,9 +144,9 @@ int32_t render_mode_occluded(RenderMode* self, int32_t x, int32_t y, int32_t z)
     return occluded;
 }
 
-int32_t render_mode_hidden(RenderMode* self, int32_t x, int32_t y, int32_t z) {
+bool render_mode_hidden(RenderMode* self, int32_t x, int32_t y, int32_t z) {
     uint32_t i;
-    int32_t hidden = 0;
+    bool hidden = false;
     for (i = 0; i < self->num_primitives; i++) {
         RenderPrimitive* prim = self->primitives[i];
         if (prim->iface->hidden) {
@@ -170,22 +170,22 @@ void render_mode_draw(RenderMode* self, PyObject* img, PyObject* mask, PyObject*
 }
 
 /* options parse helper */
-int32_t render_mode_parse_option(PyObject* support, const char* name, const char* format, ...) {
+bool render_mode_parse_option(PyObject* support, const char* name, const char* format, ...) {
     va_list ap;
     PyObject *item, *dict;
-    int32_t ret;
+    bool ret;
 
     if (support == NULL || name == NULL)
-        return 0;
+        return false;
 
     dict = PyObject_GetAttrString(support, "option_values");
     if (!dict)
-        return 0;
+        return false;
 
     item = PyDict_GetItemString(dict, name);
     if (item == NULL) {
         Py_DECREF(dict);
-        return 0;
+        return false;
     };
 
     /* make sure the item we're parsing is a tuple
diff --git a/overviewer_core/src/rendermodes.h b/overviewer_core/src/rendermodes.h
index 7b4a67f..4a05bf0 100644
--- a/overviewer_core/src/rendermodes.h
+++ b/overviewer_core/src/rendermodes.h
@@ -51,14 +51,14 @@ typedef struct {
     /* the size of the local storage for this rendermode */
     uint32_t data_size;
 
-    /* may return non-zero on error, last arg is the python support object */
-    int32_t (*start)(void*, RenderState*, PyObject*);
+    /* may return true on error, last arg is the python support object */
+    bool (*start)(void*, RenderState*, PyObject*);
     void (*finish)(void*, RenderState*);
-    /* returns non-zero to skip rendering this block because it's not visible */
-    int32_t (*occluded)(void*, RenderState*, int, int, int);
-    /* returns non-zero to skip rendering this block because the user doesn't
+    /* returns true to skip rendering this block because it's not visible */
+    bool (*occluded)(void*, RenderState*, int, int, int);
+    /* returns true to skip rendering this block because the user doesn't
      * want it visible */
-    int32_t (*hidden)(void*, RenderState*, int, int, int);
+    bool (*hidden)(void*, RenderState*, int, int, int);
     /* last two arguments are img and mask, from texture lookup */
     void (*draw)(void*, RenderState*, PyObject*, PyObject*, PyObject*);
 } RenderPrimitiveInterface;
@@ -94,12 +94,12 @@ struct _RenderMode {
 /* functions for creating / using rendermodes */
 RenderMode* render_mode_create(PyObject* mode, RenderState* state);
 void render_mode_destroy(RenderMode* self);
-int32_t render_mode_occluded(RenderMode* self, int32_t x, int32_t y, int32_t z);
-int32_t render_mode_hidden(RenderMode* self, int32_t x, int32_t y, int32_t z);
+bool render_mode_occluded(RenderMode* self, int32_t x, int32_t y, int32_t z);
+bool render_mode_hidden(RenderMode* self, int32_t x, int32_t y, int32_t z);
 void render_mode_draw(RenderMode* self, PyObject* img, PyObject* mask, PyObject* mask_light);
 
 /* helper function for reading in rendermode options
    works like PyArg_ParseTuple on a support object */
-int32_t render_mode_parse_option(PyObject* support, const char* name, const char* format, ...);
+bool render_mode_parse_option(PyObject* support, const char* name, const char* format, ...);
 
 #endif /* __RENDERMODES_H_INCLUDED__ */