diff --git a/CMakeLists.txt b/CMakeLists.txt
index e65fe3c7..7bce983a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -517,6 +517,7 @@ if(WIN32)
   set_target_properties(lovr PROPERTIES LINK_FLAGS_DEBUG "/SUBSYSTEM:CONSOLE")
   set_target_properties(lovr PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:windows /ENTRY:mainCRTStartup")
   target_compile_definitions(lovr PUBLIC -D_CRT_SECURE_NO_WARNINGS)
+  target_compile_definitions(lovr PUBLIC -D_CRT_NONSTDC_NO_WARNINGS)
 
   if(MSVC_VERSION VERSION_LESS 1900)
     target_compile_definitions(lovr PUBLIC -Dinline=__inline -Dsnprintf=_snprintf)
diff --git a/src/api/data.c b/src/api/data.c
index 9034e730..d0de0361 100644
--- a/src/api/data.c
+++ b/src/api/data.c
@@ -37,7 +37,7 @@ static int l_lovrDataNewBlob(lua_State* L) {
 
 static int l_lovrDataNewAudioStream(lua_State* L) {
   Blob* blob = luax_readblob(L, 1, "AudioStream");
-  size_t bufferSize = luaL_optinteger(L, 2, 4096);
+  int bufferSize = luaL_optinteger(L, 2, 4096);
   AudioStream* stream = lovrAudioStreamCreate(blob, bufferSize);
   luax_pushobject(L, stream);
   lovrRelease(blob);
diff --git a/src/api/filesystem.c b/src/api/filesystem.c
index 223d2c56..8bcd3b85 100644
--- a/src/api/filesystem.c
+++ b/src/api/filesystem.c
@@ -26,7 +26,7 @@ Blob* luax_readblob(lua_State* L, int index, const char* debug) {
 
 static int pushDirectoryItem(void* userdata, const char* path, const char* filename) {
   lua_State* L = userdata;
-  int n = lua_objlen(L, -1);
+  int n = luax_len(L, -1);
   lua_pushstring(L, filename);
   lua_rawseti(L, -2, n + 1);
   return 1;
diff --git a/src/api/graphics.c b/src/api/graphics.c
index 182e5d09..d0825a6a 100644
--- a/src/api/graphics.c
+++ b/src/api/graphics.c
@@ -13,7 +13,6 @@
 #include "data/textureData.h"
 #include "filesystem/filesystem.h"
 #include "util.h"
-#define _USE_MATH_DEFINES
 #include <math.h>
 #include <stdbool.h>
 
@@ -205,7 +204,7 @@ const char* WrapModes[] = {
 static uint32_t luax_getvertexcount(lua_State* L, int index) {
   int type = lua_type(L, index);
   if (type == LUA_TTABLE) {
-    size_t count = lua_objlen(L, index);
+    int count = luax_len(L, index);
     lua_rawgeti(L, index, 1);
     int tableType = lua_type(L, -1);
     lua_pop(L, 1);
@@ -1138,14 +1137,14 @@ static int l_lovrGraphicsNewMesh(lua_State* L) {
     } else if (lua_istable(L, 2)) {
       drawModeIndex++;
       formatIndex = 1;
-      count = lua_objlen(L, 2);
+      count = luax_len(L, 2);
       dataIndex = 2;
     } else if ((blob = luax_totype(L, 2, Blob)) != NULL) {
       drawModeIndex++;
       formatIndex = 1;
       dataIndex = 2;
     } else {
-      count = lua_objlen(L, 1);
+      count = luax_len(L, 1);
       dataIndex = 1;
     }
   } else {
@@ -1168,7 +1167,7 @@ static int l_lovrGraphicsNewMesh(lua_State* L) {
     attributeNames[1] = "lovrNormal";
     attributeNames[2] = "lovrTexCoord";
   } else {
-    attributeCount = lua_objlen(L, formatIndex);
+    attributeCount = luax_len(L, formatIndex);
     lovrAssert(attributeCount >= 0 && attributeCount <= MAX_ATTRIBUTES, "Attribute count must be between 0 and %d", MAX_ATTRIBUTES);
     for (int i = 0; i < attributeCount; i++) {
       lua_rawgeti(L, formatIndex, i + 1);
@@ -1178,7 +1177,7 @@ static int l_lovrGraphicsNewMesh(lua_State* L) {
       lua_rawgeti(L, -3, 1);
 
       attributeNames[i] = lua_tostring(L, -1);
-      attributes[i].offset = stride;
+      attributes[i].offset = (uint32_t) stride;
       attributes[i].type = luaL_checkoption(L, -2, "float", AttributeTypes);
       attributes[i].components = luaL_optinteger(L, -3, 1);
 
@@ -1192,7 +1191,8 @@ static int l_lovrGraphicsNewMesh(lua_State* L) {
   }
 
   if (blob) {
-    count = blob->size / stride;
+    lovrAssert(blob->size / stride < UINT32_MAX, "Too many vertices in Blob");
+    count = (uint32_t) (blob->size / stride);
   }
 
   DrawMode mode = luaL_checkoption(L, drawModeIndex, "fan", DrawModes);
@@ -1232,7 +1232,7 @@ static int l_lovrGraphicsNewMesh(lua_State* L) {
         int component = 0;
         for (int j = 0; j < attributeCount; j++) {
           MeshAttribute* attribute = &attributes[j];
-          for (int k = 0; k < attribute->components; k++) {
+          for (unsigned k = 0; k < attribute->components; k++) {
             lua_rawgeti(L, -1, ++component);
             switch (attribute->type) {
               case I8: *data.i8++ = luaL_optinteger(L, -1, 0); break;
@@ -1341,7 +1341,7 @@ static int l_lovrGraphicsNewTexture(lua_State* L) {
     depth = 1;
     index++;
   } else {
-    depth = lua_objlen(L, index++);
+    depth = luax_len(L, index++);
     type = depth > 0 ? TEXTURE_ARRAY : TEXTURE_CUBE;
   }
 
diff --git a/src/api/headset.c b/src/api/headset.c
index 68524459..12748a03 100644
--- a/src/api/headset.c
+++ b/src/api/headset.c
@@ -345,7 +345,7 @@ int luaopen_lovr_headset(lua_State* L) {
 
     // Drivers
     lua_getfield(L, -1, "drivers");
-    int n = lua_objlen(L, -1);
+    int n = luax_len(L, -1);
     for (int i = 0; i < n; i++) {
       lua_rawgeti(L, -1, i + 1);
       vec_push(&drivers, luaL_checkoption(L, -1, NULL, HeadsetDrivers));
diff --git a/src/api/math.c b/src/api/math.c
index 00d567cf..a038bfe8 100644
--- a/src/api/math.c
+++ b/src/api/math.c
@@ -82,7 +82,7 @@ static int l_lovrMathNewCurve(lua_State* L) {
 
   if (lua_istable(L, 1)) {
     int pointIndex = 0;
-    int length = lua_objlen(L, 1);
+    int length = luax_len(L, 1);
     for (int i = 1; i <= length;) {
       lua_rawgeti(L, 1, i + 0);
       lua_rawgeti(L, 1, i + 1);
diff --git a/src/api/physics.c b/src/api/physics.c
index 2d3d51ac..ea701fba 100644
--- a/src/api/physics.c
+++ b/src/api/physics.c
@@ -25,7 +25,7 @@ static int l_lovrPhysicsNewWorld(lua_State* L) {
   const char* tags[16];
   int tagCount;
   if (lua_type(L, 5) == LUA_TTABLE) {
-    tagCount = lua_objlen(L, 5);
+    tagCount = luax_len(L, 5);
     for (int i = 0; i < tagCount; i++) {
       lua_rawgeti(L, -1, i + 1);
       if (lua_isstring(L, -1)) {
diff --git a/src/api/types/canvas.c b/src/api/types/canvas.c
index 1eaef2de..581f711a 100644
--- a/src/api/types/canvas.c
+++ b/src/api/types/canvas.c
@@ -42,7 +42,7 @@ void luax_readattachments(lua_State* L, int index, Attachment* attachments, int*
   int n;
 
   if (lua_istable(L, index)) {
-    n = lua_objlen(L, index);
+    n = luax_len(L, index);
     n = MIN(n, 3 * MAX_CANVAS_ATTACHMENTS);
     for (int i = 0; i < n; i++) {
       lua_rawgeti(L, index, i + 1);
diff --git a/src/api/types/collider.c b/src/api/types/collider.c
index c13cac66..5f53ca19 100644
--- a/src/api/types/collider.c
+++ b/src/api/types/collider.c
@@ -53,16 +53,16 @@ static int l_lovrColliderGetJoints(lua_State* L) {
 
 static int l_lovrColliderGetUserData(lua_State* L) {
   Collider* collider = luax_checktype(L, 1, Collider);
-  int ref = (int) lovrColliderGetUserData(collider);
-  lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+  union { int i; void* p; } ref = { .p = lovrColliderGetUserData(collider) };
+  lua_rawgeti(L, LUA_REGISTRYINDEX, ref.i);
   return 1;
 }
 
 static int l_lovrColliderSetUserData(lua_State* L) {
   Collider* collider = luax_checktype(L, 1, Collider);
-  uint64_t ref = (int) lovrColliderGetUserData(collider);
-  if (ref) {
-    luaL_unref(L, LUA_REGISTRYINDEX, ref);
+  union { int i; void* p; } ref = { .p = lovrColliderGetUserData(collider) };
+  if (ref.i) {
+    luaL_unref(L, LUA_REGISTRYINDEX, ref.i);
   }
 
   if (lua_gettop(L) < 2) {
@@ -70,8 +70,8 @@ static int l_lovrColliderSetUserData(lua_State* L) {
   }
 
   lua_settop(L, 2);
-  ref = luaL_ref(L, LUA_REGISTRYINDEX);
-  lovrColliderSetUserData(collider, (void*) ref);
+  ref.i = luaL_ref(L, LUA_REGISTRYINDEX);
+  lovrColliderSetUserData(collider, ref.p);
   return 0;
 }
 
@@ -164,7 +164,7 @@ static int l_lovrColliderSetMassData(lua_State* L) {
   float cz = luax_checkfloat(L, 4);
   float mass = luax_checkfloat(L, 5);
   float inertia[6];
-  if (lua_istable(L, 6) && lua_objlen(L, 6) >= 6) {
+  if (lua_istable(L, 6) && luax_len(L, 6) >= 6) {
     for (int i = 0; i < 6; i++) {
       lua_rawgeti(L, 6, i + 1);
       if (!lua_isnumber(L, -1)) {
diff --git a/src/api/types/joints.c b/src/api/types/joints.c
index fb465ca3..c7cf08e5 100644
--- a/src/api/types/joints.c
+++ b/src/api/types/joints.c
@@ -25,16 +25,16 @@ static int l_lovrJointGetColliders(lua_State* L) {
 
 static int l_lovrJointGetUserData(lua_State* L) {
   Joint* joint = luax_checktype(L, 1, Joint);
-  int ref = (int) lovrJointGetUserData(joint);
-  lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+  union { int i; void* p; } ref = { .p = lovrJointGetUserData(joint) };
+  lua_rawgeti(L, LUA_REGISTRYINDEX, ref.i);
   return 1;
 }
 
 static int l_lovrJointSetUserData(lua_State* L) {
   Joint* joint = luax_checktype(L, 1, Joint);
-  uint64_t ref = (int) lovrJointGetUserData(joint);
-  if (ref) {
-    luaL_unref(L, LUA_REGISTRYINDEX, ref);
+  union { int i; void* p; } ref = { .p = lovrJointGetUserData(joint) };
+  if (ref.i) {
+    luaL_unref(L, LUA_REGISTRYINDEX, ref.i);
   }
 
   if (lua_gettop(L) < 2) {
@@ -42,8 +42,8 @@ static int l_lovrJointSetUserData(lua_State* L) {
   }
 
   lua_settop(L, 2);
-  ref = luaL_ref(L, LUA_REGISTRYINDEX);
-  lovrJointSetUserData(joint, (void*) ref);
+  ref.i = luaL_ref(L, LUA_REGISTRYINDEX);
+  lovrJointSetUserData(joint, ref.p);
   return 0;
 }
 
diff --git a/src/api/types/mesh.c b/src/api/types/mesh.c
index 44c3dd85..bc18a795 100644
--- a/src/api/types/mesh.c
+++ b/src/api/types/mesh.c
@@ -18,7 +18,7 @@ static int l_lovrMeshAttachAttributes(lua_State* L) {
       lovrMeshAttachAttribute(mesh, other->attributeNames[i], &attachment);
     }
   } else if (lua_istable(L, 4)) {
-    int length = lua_objlen(L, 4);
+    int length = luax_len(L, 4);
     for (int i = 0; i < length; i++) {
       lua_rawgeti(L, 4, i + 1);
       const char* name = lua_tostring(L, -1);
@@ -56,7 +56,7 @@ static int l_lovrMeshDetachAttributes(lua_State* L) {
       lovrMeshDetachAttribute(mesh, other->attributeNames[i]);
     }
   } else if (lua_istable(L, 2)) {
-    int length = lua_objlen(L, 2);
+    int length = luax_len(L, 2);
     for (int i = 0; i < length; i++) {
       lua_rawgeti(L, 2, i + 1);
       lovrMeshDetachAttribute(mesh, lua_tostring(L, -1));
@@ -152,7 +152,7 @@ static int l_lovrMeshGetVertex(lua_State* L) {
     if (attribute->buffer != mesh->vertexBuffer) {
       break;
     }
-    for (int j = 0; j < attribute->components; j++, components++) {
+    for (unsigned j = 0; j < attribute->components; j++, components++) {
       switch (attribute->type) {
         case I8: lua_pushinteger(L, *data.i8++); break;
         case U8: lua_pushinteger(L, *data.u8++); break;
@@ -186,7 +186,7 @@ static int l_lovrMeshSetVertex(lua_State* L) {
       break;
     }
 
-    for (int j = 0; j < attribute->components; j++) {
+    for (unsigned j = 0; j < attribute->components; j++) {
       int k = 3 + j;
       if (table) {
         lua_rawgeti(L, 3, ++component);
@@ -223,7 +223,7 @@ static int l_lovrMeshGetVertexAttribute(lua_State* L) {
   lovrAssert(mesh->attributes[attributeIndex].buffer == mesh->vertexBuffer, "Invalid mesh attribute: %d", attributeIndex + 1);
   MeshAttribute* attribute = &mesh->attributes[attributeIndex];
   AttributeData data = { .raw = lovrBufferMap(buffer, vertexIndex * attribute->stride + attribute->offset) };
-  for (int i = 0; i < attribute->components; i++) {
+  for (unsigned i = 0; i < attribute->components; i++) {
     switch (attribute->type) {
       case I8: lua_pushinteger(L, *data.i8++); break;
       case U8: lua_pushinteger(L, *data.u8++); break;
@@ -247,7 +247,7 @@ static int l_lovrMeshSetVertexAttribute(lua_State* L) {
   lovrAssert(mesh->attributes[attributeIndex].buffer == mesh->vertexBuffer, "Invalid mesh attribute: %d", attributeIndex + 1);
   MeshAttribute* attribute = &mesh->attributes[attributeIndex];
   AttributeData data = { .raw = lovrBufferMap(mesh->vertexBuffer, vertexIndex * attribute->stride + attribute->offset) };
-  for (int i = 0; i < attribute->components; i++) {
+  for (unsigned i = 0; i < attribute->components; i++) {
     int index = 4 + i;
     if (table) {
       lua_rawgeti(L, 4, i + 1);
@@ -276,7 +276,7 @@ static int l_lovrMeshSetVertices(lua_State* L) {
   Mesh* mesh = luax_checktype(L, 1, Mesh);
   uint32_t capacity = lovrMeshGetVertexCount(mesh);
   luaL_checktype(L, 2, LUA_TTABLE);
-  uint32_t sourceSize = lua_objlen(L, 2);
+  uint32_t sourceSize = luax_len(L, 2);
   uint32_t start = luaL_optinteger(L, 3, 1) - 1;
   uint32_t count = luaL_optinteger(L, 4, sourceSize);
   lovrAssert(start + count <= capacity, "Overflow in Mesh:setVertices: Mesh can only hold %d vertices", capacity);
@@ -299,7 +299,7 @@ static int l_lovrMeshSetVertices(lua_State* L) {
         break;
       }
 
-      for (int k = 0; k < attribute->components; k++) {
+      for (unsigned k = 0; k < attribute->components; k++) {
         lua_rawgeti(L, -1, ++component);
 
         switch (attribute->type) {
@@ -348,7 +348,7 @@ static int l_lovrMeshGetVertexMap(lua_State* L) {
     lua_createtable(L, count, 0);
   }
 
-  for (size_t i = 0; i < count; i++) {
+  for (uint32_t i = 0; i < count; i++) {
     uint32_t index = size == sizeof(uint32_t) ? indices.ints[i] : indices.shorts[i];
     lua_pushinteger(L, index + 1);
     lua_rawseti(L, 2, i + 1);
@@ -369,7 +369,8 @@ static int l_lovrMeshSetVertexMap(lua_State* L) {
     Blob* blob = luax_checktype(L, 2, Blob);
     size_t size = luaL_optinteger(L, 3, 4);
     lovrAssert(size == 2 || size == 4, "Size of Mesh indices should be 2 bytes or 4 bytes");
-    uint32_t count = blob->size / size;
+    lovrAssert(blob->size / size < UINT32_MAX, "Too many Mesh indices");
+    uint32_t count = (uint32_t) (blob->size / size);
     Buffer* indexBuffer = lovrMeshGetIndexBuffer(mesh);
     if (!indexBuffer || count * size > lovrBufferGetSize(indexBuffer)) {
       Buffer* vertexBuffer = lovrMeshGetVertexBuffer(mesh);
@@ -384,7 +385,7 @@ static int l_lovrMeshSetVertexMap(lua_State* L) {
     }
   } else {
     luaL_checktype(L, 2, LUA_TTABLE);
-    uint32_t count = lua_objlen(L, 2);
+    uint32_t count = luax_len(L, 2);
     uint32_t vertexCount = lovrMeshGetVertexCount(mesh);
     size_t size = vertexCount > USHRT_MAX ? sizeof(uint32_t) : sizeof(uint16_t);
 
diff --git a/src/api/types/shader.c b/src/api/types/shader.c
index 15b69c57..e0a4f17c 100644
--- a/src/api/types/shader.c
+++ b/src/api/types/shader.c
@@ -49,7 +49,7 @@ int luax_checkuniform(lua_State* L, int index, const Uniform* uniform, void* des
 
   if (components == 1) {
     bool isTable = lua_istable(L, index);
-    int length = isTable ? lua_objlen(L, index) : count;
+    int length = isTable ? luax_len(L, index) : count;
     length = MIN(length, count);
     for (int i = 0; i < count; i++) {
       int j = index + i;
@@ -95,7 +95,7 @@ int luax_checkuniform(lua_State* L, int index, const Uniform* uniform, void* des
     }
 
     if (wrappedTable) {
-      int length = lua_objlen(L, index);
+      int length = luax_len(L, index);
       length = MIN(length, count);
       for (int i = 0; i < length; i++) {
         lua_rawgeti(L, index, i + 1);
diff --git a/src/api/types/shapes.c b/src/api/types/shapes.c
index 68875abf..51f35271 100644
--- a/src/api/types/shapes.c
+++ b/src/api/types/shapes.c
@@ -34,16 +34,16 @@ static int l_lovrShapeSetEnabled(lua_State* L) {
 
 static int l_lovrShapeGetUserData(lua_State* L) {
   Shape* shape = luax_checktype(L, 1, Shape);
-  int ref = (int) lovrShapeGetUserData(shape);
-  lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+  union { int i; void* p; } ref = { .p = lovrShapeGetUserData(shape) };
+  lua_rawgeti(L, LUA_REGISTRYINDEX, ref.i);
   return 1;
 }
 
 static int l_lovrShapeSetUserData(lua_State* L) {
   Shape* shape = luax_checktype(L, 1, Shape);
-  uint64_t ref = (int) lovrShapeGetUserData(shape);
-  if (ref) {
-    luaL_unref(L, LUA_REGISTRYINDEX, ref);
+  union { int i; void* p; } ref = { .p = lovrShapeGetUserData(shape) };
+  if (ref.i) {
+    luaL_unref(L, LUA_REGISTRYINDEX, ref.i);
   }
 
   if (lua_gettop(L) < 2) {
@@ -51,8 +51,8 @@ static int l_lovrShapeSetUserData(lua_State* L) {
   }
 
   lua_settop(L, 2);
-  ref = luaL_ref(L, LUA_REGISTRYINDEX);
-  lovrShapeSetUserData(shape, (void*) ref);
+  ref.i = luaL_ref(L, LUA_REGISTRYINDEX);
+  lovrShapeSetUserData(shape, ref.p);
   return 0;
 }
 
diff --git a/src/audio/source.c b/src/audio/source.c
index 1f067ae1..0e7b27f5 100644
--- a/src/audio/source.c
+++ b/src/audio/source.c
@@ -1,7 +1,6 @@
 #include "audio/source.h"
 #include "audio/audio.h"
 #include "data/audioStream.h"
-#define _USE_MATH_DEFINES
 #include <math.h>
 #include <stdlib.h>
 
@@ -17,7 +16,7 @@ Source* lovrSourceInitStatic(Source* source, SoundData* soundData) {
   source->soundData = soundData;
   alGenSources(1, &source->id);
   alGenBuffers(1, source->buffers);
-  alBufferData(source->buffers[0], format, soundData->blob.data, soundData->blob.size, soundData->sampleRate);
+  alBufferData(source->buffers[0], format, soundData->blob.data, (ALsizei) soundData->blob.size, soundData->sampleRate);
   alSourcei(source->id, AL_BUFFER, source->buffers[0]);
   lovrRetain(soundData);
   return source;
diff --git a/src/data/audioStream.c b/src/data/audioStream.c
index 92d75ced..788ae7d5 100644
--- a/src/data/audioStream.c
+++ b/src/data/audioStream.c
@@ -3,8 +3,8 @@
 #include "util.h"
 #include <stdlib.h>
 
-AudioStream* lovrAudioStreamInit(AudioStream* stream, Blob* blob, size_t bufferSize) {
-  stb_vorbis* decoder = stb_vorbis_open_memory(blob->data, blob->size, NULL, NULL);
+AudioStream* lovrAudioStreamInit(AudioStream* stream, Blob* blob, int bufferSize) {
+  stb_vorbis* decoder = stb_vorbis_open_memory(blob->data, (int) blob->size, NULL, NULL);
   lovrAssert(decoder, "Could not create audio stream for '%s'", blob->name);
 
   stb_vorbis_info info = stb_vorbis_get_info(decoder);
@@ -30,7 +30,7 @@ void lovrAudioStreamDestroy(void* ref) {
   free(stream->buffer);
 }
 
-int lovrAudioStreamDecode(AudioStream* stream, short* destination, size_t size) {
+int lovrAudioStreamDecode(AudioStream* stream, short* destination, int size) {
   stb_vorbis* decoder = (stb_vorbis*) stream->decoder;
   short* buffer = destination ? destination : (short*) stream->buffer;
   int capacity = destination ? size : (stream->bufferSize / sizeof(short));
diff --git a/src/data/audioStream.h b/src/data/audioStream.h
index 42e7d6aa..833a74d2 100644
--- a/src/data/audioStream.h
+++ b/src/data/audioStream.h
@@ -15,10 +15,10 @@ typedef struct {
   Blob* blob;
 } AudioStream;
 
-AudioStream* lovrAudioStreamInit(AudioStream* stream, Blob* blob, size_t bufferSize);
+AudioStream* lovrAudioStreamInit(AudioStream* stream, Blob* blob, int bufferSize);
 #define lovrAudioStreamCreate(...) lovrAudioStreamInit(lovrAlloc(AudioStream), __VA_ARGS__)
 void lovrAudioStreamDestroy(void* ref);
-int lovrAudioStreamDecode(AudioStream* stream, short* destination, size_t size);
+int lovrAudioStreamDecode(AudioStream* stream, short* destination, int size);
 void lovrAudioStreamRewind(AudioStream* stream);
 void lovrAudioStreamSeek(AudioStream* stream, int sample);
 int lovrAudioStreamTell(AudioStream* stream);
diff --git a/src/data/modelData.h b/src/data/modelData.h
index 1b6971b3..09c12e5b 100644
--- a/src/data/modelData.h
+++ b/src/data/modelData.h
@@ -106,7 +106,7 @@ typedef struct {
 } ModelBuffer;
 
 typedef struct {
-  size_t offset;
+  uint32_t offset;
   uint32_t buffer;
   uint32_t count;
   AttributeType type;
diff --git a/src/data/modelData_gltf.c b/src/data/modelData_gltf.c
index 7dff4bae..fba467b3 100644
--- a/src/data/modelData_gltf.c
+++ b/src/data/modelData_gltf.c
@@ -160,7 +160,7 @@ ModelData* lovrModelDataInitGltf(ModelData* model, Blob* source) {
   int tokenCount = 0;
 
   if ((tokenCount = jsmn_parse(&parser, json, jsonLength, stackTokens, MAX_STACK_TOKENS)) == JSMN_ERROR_NOMEM) {
-    size_t capacity = MAX_STACK_TOKENS;
+    int capacity = MAX_STACK_TOKENS;
     jsmn_init(&parser); // This shouldn't be necessary but not doing it caused an infinite loop?
 
     do {
diff --git a/src/data/rasterizer.c b/src/data/rasterizer.c
index b6b992fa..66500594 100644
--- a/src/data/rasterizer.c
+++ b/src/data/rasterizer.c
@@ -41,8 +41,7 @@ bool lovrRasterizerHasGlyph(Rasterizer* rasterizer, uint32_t character) {
 }
 
 bool lovrRasterizerHasGlyphs(Rasterizer* rasterizer, const char* str) {
-  int len = strlen(str);
-  const char* end = str + len;
+  const char* end = str + strlen(str);
   unsigned int codepoint;
   size_t bytes;
 
diff --git a/src/data/soundData.c b/src/data/soundData.c
index 2cd48617..b24bfad6 100644
--- a/src/data/soundData.c
+++ b/src/data/soundData.c
@@ -24,9 +24,9 @@ SoundData* lovrSoundDataInitFromAudioStream(SoundData* soundData, AudioStream* a
 
   int samples;
   short* buffer = soundData->blob.data;
-  size_t offset = 0;
+  int offset = 0;
   lovrAudioStreamRewind(audioStream);
-  while ((samples = lovrAudioStreamDecode(audioStream, buffer + offset, soundData->blob.size - (offset * sizeof(short)))) != 0) {
+  while ((samples = lovrAudioStreamDecode(audioStream, buffer + offset, (int) soundData->blob.size - (offset * sizeof(short)))) != 0) {
     offset += samples;
   }
 
@@ -35,7 +35,7 @@ SoundData* lovrSoundDataInitFromAudioStream(SoundData* soundData, AudioStream* a
 
 SoundData* lovrSoundDataInitFromBlob(SoundData* soundData, Blob* blob) {
   soundData->bitDepth = 16;
-  soundData->samples = stb_vorbis_decode_memory(blob->data, blob->size, &soundData->channelCount, &soundData->sampleRate, (short**) &soundData->blob.data);
+  soundData->samples = stb_vorbis_decode_memory(blob->data, (int) blob->size, &soundData->channelCount, &soundData->sampleRate, (short**) &soundData->blob.data);
   soundData->blob.size = soundData->samples * soundData->channelCount * (soundData->bitDepth / 8);
   return soundData;
 }
diff --git a/src/data/textureData.c b/src/data/textureData.c
index f4f9cbe3..10f581ce 100644
--- a/src/data/textureData.c
+++ b/src/data/textureData.c
@@ -111,9 +111,9 @@ static int parseDDS(uint8_t* data, size_t size, TextureData* textureData) {
 
   // Load mipmaps
   for (int i = 0; i < mipmapCount; i++) {
-    size_t numBlocksWide = width ? MAX(1, (width + 3) / 4) : 0;
-    size_t numBlocksHigh = height ? MAX(1, (height + 3) / 4) : 0;
-    size_t mipmapSize = numBlocksWide * numBlocksHigh * blockBytes;
+    int numBlocksWide = width ? MAX(1, (width + 3) / 4) : 0;
+    int numBlocksHigh = height ? MAX(1, (height + 3) / 4) : 0;
+    int mipmapSize = numBlocksWide * numBlocksHigh * blockBytes;
 
     // Overflow check
     if (mipmapSize == 0 || (offset + mipmapSize) > size) {
@@ -158,13 +158,14 @@ TextureData* lovrTextureDataInitFromBlob(TextureData* textureData, Blob* blob, b
     return textureData;
   }
 
+  int length = (int) blob->size;
   stbi_set_flip_vertically_on_load(flip);
-  if (stbi_is_hdr_from_memory(blob->data, blob->size)) {
+  if (stbi_is_hdr_from_memory(blob->data, length)) {
     textureData->format = FORMAT_RGBA32F;
-    textureData->blob.data = stbi_loadf_from_memory(blob->data, blob->size, &textureData->width, &textureData->height, NULL, 4);
+    textureData->blob.data = stbi_loadf_from_memory(blob->data, length, &textureData->width, &textureData->height, NULL, 4);
   } else {
     textureData->format = FORMAT_RGBA;
-    textureData->blob.data = stbi_load_from_memory(blob->data, blob->size, &textureData->width, &textureData->height, NULL, 4);
+    textureData->blob.data = stbi_load_from_memory(blob->data, length, &textureData->width, &textureData->height, NULL, 4);
   }
 
   if (!textureData->blob.data) {
@@ -250,7 +251,7 @@ bool lovrTextureDataEncode(TextureData* textureData, const char* filename) {
   int width = textureData->width;
   int height = textureData->height;
   void* data = (uint8_t*) textureData->blob.data + (textureData->height - 1) * textureData->width * components;
-  size_t stride = -textureData->width * components;
+  int stride = -textureData->width * components;
   bool success = stbi_write_png_to_func(writeCallback, &file, width, height, components, data, stride);
   lovrFileDestroy(&file);
   return success;
diff --git a/src/data/textureData.h b/src/data/textureData.h
index 62c596c7..2ee7c973 100644
--- a/src/data/textureData.h
+++ b/src/data/textureData.h
@@ -31,7 +31,7 @@ typedef struct {
   int width;
   int height;
   void* data;
-  size_t size;
+  int size;
 } Mipmap;
 
 typedef vec_t(Mipmap) vec_mipmap_t;
diff --git a/src/filesystem/filesystem.c b/src/filesystem/filesystem.c
index facf35d9..aa23f8be 100644
--- a/src/filesystem/filesystem.c
+++ b/src/filesystem/filesystem.c
@@ -118,7 +118,7 @@ int lovrFilesystemGetAppdataDirectory(char* dest, unsigned int size) {
 }
 
 void lovrFilesystemGetDirectoryItems(const char* path, getDirectoryItemsCallback callback, void* userdata) {
-  PHYSFS_enumerate(path, callback, userdata);
+  PHYSFS_enumerate(path, (PHYSFS_EnumerateCallback) callback, userdata);
 }
 
 int lovrFilesystemGetExecutablePath(char* path, uint32_t size) {
diff --git a/src/filesystem/filesystem.h b/src/filesystem/filesystem.h
index bd3fe768..a268241b 100644
--- a/src/filesystem/filesystem.h
+++ b/src/filesystem/filesystem.h
@@ -9,7 +9,7 @@
 
 extern const char lovrDirSep;
 
-typedef int getDirectoryItemsCallback(void* userdata, const char* dir, const char* file);
+typedef int (*getDirectoryItemsCallback)(void* userdata, const char* dir, const char* file);
 
 typedef struct {
   bool initialized;
diff --git a/src/graphics/buffer.c b/src/graphics/buffer.c
index c2fad9bd..ed8abc3b 100644
--- a/src/graphics/buffer.c
+++ b/src/graphics/buffer.c
@@ -25,5 +25,5 @@ void lovrBufferFlush(Buffer* buffer) {
 
   lovrBufferFlushRange(buffer, buffer->flushFrom, buffer->flushTo - buffer->flushFrom);
   buffer->flushFrom = SIZE_MAX;
-  buffer->flushTo = -SIZE_MAX;
+  buffer->flushTo = 0;
 }
diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index c3732256..c5ae59ee 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -8,7 +8,6 @@
 #include "lib/stb/stb_image.h"
 #include <stdlib.h>
 #include <string.h>
-#define _USE_MATH_DEFINES
 #include <math.h>
 
 static GraphicsState state;
@@ -21,7 +20,7 @@ static void gammaCorrectColor(Color* color) {
   }
 }
 
-static void onCloseWindow() {
+static void onCloseWindow(void) {
   lovrEventPush((Event) { .type = EVENT_QUIT, .data.quit = { false, 0 } });
 }
 
@@ -30,7 +29,7 @@ static void onResizeWindow(int width, int height) {
   state.height = height;
 }
 
-static const size_t BUFFER_COUNTS[] = {
+static const uint32_t BUFFER_COUNTS[] = {
   [STREAM_VERTEX] = (1 << 16) - 1,
   [STREAM_INDEX] = 1 << 16,
   [STREAM_DRAW_ID] = (1 << 16) - 1,
@@ -61,7 +60,7 @@ static void lovrGraphicsInitBuffers() {
   }
 
   // Compute the max number of draws per batch, since the hard cap of 256 won't always fit in a UBO
-  size_t maxBlockSize = lovrGpuGetLimits()->blockSize;
+  int maxBlockSize = lovrGpuGetLimits()->blockSize;
   state.maxDraws = MIN(maxBlockSize / sizeof(DrawData) / 64 * 64, 256);
 
   // The identity buffer is used for autoinstanced meshes and instanced primitives and maps the
@@ -95,7 +94,7 @@ static void lovrGraphicsInitBuffers() {
 
 static void* lovrGraphicsMapBuffer(BufferRole role, uint32_t count) {
   Buffer* buffer = state.buffers[role];
-  size_t limit = BUFFER_COUNTS[role];
+  uint32_t limit = BUFFER_COUNTS[role];
   lovrAssert(count <= limit, "Whoa there!  Tried to get %d elements from a buffer that only has %d elements.", count, limit);
 
   if (state.cursors[role] + count > limit) {
@@ -239,8 +238,8 @@ void lovrGraphicsSetCamera(Camera* camera, bool clear) {
     memset(&state.camera, 0, sizeof(Camera));
     mat4_identity(state.camera.viewMatrix[0]);
     mat4_identity(state.camera.viewMatrix[1]);
-    mat4_perspective(state.camera.projection[0], .01f, 100.f, 67. * M_PI / 180., (float) state.width / state.height);
-    mat4_perspective(state.camera.projection[1], .01f, 100.f, 67. * M_PI / 180., (float) state.width / state.height);
+    mat4_perspective(state.camera.projection[0], .01f, 100.f, 67.f * M_PI / 180.f, (float) state.width / state.height);
+    mat4_perspective(state.camera.projection[1], .01f, 100.f, 67.f * M_PI / 180.f, (float) state.width / state.height);
   } else {
     state.camera = *camera;
   }
@@ -496,7 +495,7 @@ void lovrGraphicsBatch(BatchRequest* req) {
 
   if (req->type == BATCH_MESH) {
     float* pose = req->params.mesh.pose ? req->params.mesh.pose : (float[]) MAT4_IDENTITY;
-    size_t count = req->params.mesh.pose ? (MAX_BONES * 16) : 16;
+    int count = req->params.mesh.pose ? (MAX_BONES * 16) : 16;
     lovrShaderSetMatrices(shader, "lovrPose", pose, 0, count);
   }
 
@@ -537,7 +536,7 @@ void lovrGraphicsBatch(BatchRequest* req) {
 
   for (int i = 0; i < MAX_BUFFER_ROLES; i++) {
     if (streamRequirements[i] > 0 && state.cursors[i] + streamRequirements[i] > BUFFER_COUNTS[i]) {
-      size_t oldCursor = state.cursors[i];
+      uint32_t oldCursor = state.cursors[i];
       lovrGraphicsFlush();
       state.locks[i][MAX_LOCKS - 1] = lovrGpuLock();
       state.cursors[i] = state.cursors[i] >= oldCursor ? 0 : state.cursors[i];
@@ -821,9 +820,9 @@ void lovrGraphicsFlush() {
 
     if (batch->vertexCount > 0) {
       size_t lockSize = BUFFER_COUNTS[STREAM_VERTEX] / MAX_LOCKS + 1;
-      int firstLock = batch->vertexStart / lockSize;
-      int lastLock = (batch->vertexStart + batch->vertexCount) / lockSize;
-      for (int i = firstLock; i < lastLock; i++) {
+      size_t firstLock = batch->vertexStart / lockSize;
+      size_t lastLock = (batch->vertexStart + batch->vertexCount) / lockSize;
+      for (size_t i = firstLock; i < lastLock; i++) {
         state.locks[STREAM_VERTEX][i] = lovrGpuLock();
         if (!instanced) {
           state.locks[STREAM_DRAW_ID][i] = lovrGpuLock();
@@ -833,18 +832,18 @@ void lovrGraphicsFlush() {
 
     if (batch->indexCount > 0) {
       size_t lockSize = BUFFER_COUNTS[STREAM_INDEX] / MAX_LOCKS + 1;
-      int firstLock = batch->indexStart / lockSize;
-      int lastLock = (batch->indexStart + batch->indexCount) / lockSize;
-      for (int i = firstLock; i < lastLock; i++) {
+      size_t firstLock = batch->indexStart / lockSize;
+      size_t lastLock = (batch->indexStart + batch->indexCount) / lockSize;
+      for (size_t i = firstLock; i < lastLock; i++) {
         state.locks[STREAM_INDEX][i] = lovrGpuLock();
       }
     }
 
     if (batch->drawCount > 0) {
       size_t lockSize = BUFFER_COUNTS[STREAM_DRAW_DATA] / MAX_LOCKS;
-      int firstLock = batch->drawStart / lockSize;
-      int lastLock = MIN(batch->drawStart + state.maxDraws, BUFFER_COUNTS[STREAM_DRAW_DATA] - 1) / lockSize;
-      for (int i = firstLock; i < lastLock; i++) {
+      size_t firstLock = batch->drawStart / lockSize;
+      size_t lastLock = MIN(batch->drawStart + state.maxDraws, BUFFER_COUNTS[STREAM_DRAW_DATA] - 1) / lockSize;
+      for (size_t i = firstLock; i < lastLock; i++) {
         state.locks[STREAM_DRAW_DATA][i] = lovrGpuLock();
       }
     }
diff --git a/src/graphics/graphics.h b/src/graphics/graphics.h
index 20f2bb39..a14afeab 100644
--- a/src/graphics/graphics.h
+++ b/src/graphics/graphics.h
@@ -185,7 +185,7 @@ typedef struct {
   Mesh* instancedMesh;
   Buffer* identityBuffer;
   Buffer* buffers[MAX_BUFFER_ROLES];
-  size_t cursors[MAX_BUFFER_ROLES];
+  uint32_t cursors[MAX_BUFFER_ROLES];
   void* locks[MAX_BUFFER_ROLES][MAX_LOCKS];
   Batch cachedGeometry;
   Batch batches[MAX_BATCHES];
diff --git a/src/graphics/shader.c b/src/graphics/shader.c
index 59be8d3f..a18e3ef0 100644
--- a/src/graphics/shader.c
+++ b/src/graphics/shader.c
@@ -163,7 +163,7 @@ size_t lovrShaderComputeUniformLayout(vec_uniform_t* uniforms) {
   size_t size = 0;
   Uniform* uniform; int i;
   vec_foreach_ptr(uniforms, uniform, i) {
-    size_t align;
+    int align;
     if (uniform->count > 1 || uniform->type == UNIFORM_MATRIX) {
       align = 16 * (uniform->type == UNIFORM_MATRIX ? uniform->components : 1);
       uniform->size = align * uniform->count;
diff --git a/src/headset/desktop.c b/src/headset/desktop.c
index 7cfa5e75..ff8437e4 100644
--- a/src/headset/desktop.c
+++ b/src/headset/desktop.c
@@ -2,7 +2,6 @@
 #include "graphics/graphics.h"
 #include "lib/math.h"
 #include "platform.h"
-#define _USE_MATH_DEFINES
 #include <math.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -58,7 +57,7 @@ static bool desktopInit(float offset, int msaa) {
   return true;
 }
 
-static void desktopDestroy() {
+static void desktopDestroy(void) {
   Controller *controller; int i;
   vec_foreach(&state.controllers, controller, i) {
     lovrRelease(controller);
@@ -67,15 +66,15 @@ static void desktopDestroy() {
   memset(&state, 0, sizeof(state));
 }
 
-static HeadsetType desktopGetType() {
+static HeadsetType desktopGetType(void) {
   return HEADSET_UNKNOWN;
 }
 
-static HeadsetOrigin desktopGetOriginType() {
+static HeadsetOrigin desktopGetOriginType(void) {
   return ORIGIN_HEAD;
 }
 
-static bool desktopIsMounted() {
+static bool desktopIsMounted(void) {
   return true;
 }
 
@@ -181,7 +180,7 @@ static void desktopRenderTo(void (*callback)(void*), void* userdata) {
   uint32_t width, height;
   desktopGetDisplayDimensions(&width, &height);
   Camera camera = { .canvas = NULL, .viewMatrix = { MAT4_IDENTITY }, .stereo = true };
-  mat4_perspective(camera.projection[0], state.clipNear, state.clipFar, 67 * M_PI / 180., (float) width / 2.f / height);
+  mat4_perspective(camera.projection[0], state.clipNear, state.clipFar, 67.f * M_PI / 180.f, (float) width / 2.f / height);
   mat4_multiply(camera.viewMatrix[0], state.transform);
   mat4_invertPose(camera.viewMatrix[0]);
   mat4_set(camera.projection[1], camera.projection[0]);
diff --git a/src/headset/openvr.c b/src/headset/openvr.c
index e1f8fa67..f25aebe5 100644
--- a/src/headset/openvr.c
+++ b/src/headset/openvr.c
@@ -10,6 +10,8 @@
 #include <stdint.h>
 #ifndef WIN32
 #pragma pack(push, 4)
+#else
+#undef EXTERN_C
 #endif
 #include <openvr_capi.h>
 #ifndef WIN32
@@ -177,7 +179,7 @@ static bool openvrInit(float offset, int msaa) {
   return true;
 }
 
-static void openvrDestroy() {
+static void openvrDestroy(void) {
   lovrRelease(state.canvas);
   for (int i = 0; i < 16; i++) {
     if (state.deviceModels[i]) {
@@ -199,11 +201,11 @@ static void openvrDestroy() {
   memset(&state, 0, sizeof(HeadsetState));
 }
 
-static HeadsetType openvrGetType() {
+static HeadsetType openvrGetType(void) {
   return state.type;
 }
 
-static HeadsetOrigin openvrGetOriginType() {
+static HeadsetOrigin openvrGetOriginType(void) {
   switch (state.compositor->GetTrackingSpace()) {
     case ETrackingUniverseOrigin_TrackingUniverseSeated: return ORIGIN_HEAD;
     case ETrackingUniverseOrigin_TrackingUniverseStanding: return ORIGIN_FLOOR;
@@ -211,7 +213,7 @@ static HeadsetOrigin openvrGetOriginType() {
   }
 }
 
-static bool openvrIsMounted() {
+static bool openvrIsMounted(void) {
   VRControllerState_t input;
   state.system->GetControllerState(HEADSET_INDEX, &input, sizeof(input));
   return (input.ulButtonPressed >> EVRButtonId_k_EButton_ProximitySensor) & 1;
@@ -592,7 +594,7 @@ static void openvrUpdate(float dt) {
   }
 }
 
-static Texture* openvrGetMirrorTexture() {
+static Texture* openvrGetMirrorTexture(void) {
   return lovrCanvasGetAttachments(state.canvas, NULL)[0].texture;
 }
 
diff --git a/src/lib/lua-cjson/lua_cjson.c b/src/lib/lua-cjson/lua_cjson.c
index 61fdf1cb..75c7e950 100644
--- a/src/lib/lua-cjson/lua_cjson.c
+++ b/src/lib/lua-cjson/lua_cjson.c
@@ -481,7 +481,7 @@ static void json_append_string(lua_State *l, strbuf_t *json, int lindex)
      * This buffer is reused constantly for small strings
      * If there are any excess pages, they won't be hit anyway.
      * This gains ~5% speedup. */
-    strbuf_ensure_empty_length(json, len * 6 + 2);
+    strbuf_ensure_empty_length(json, (int) (len * 6 + 2));
 
     strbuf_append_char_unsafe(json, '\"');
     for (i = 0; i < len; i++) {
@@ -1290,7 +1290,7 @@ static int json_decode(lua_State *l)
     /* Ensure the temporary buffer can hold the entire string.
      * This means we no longer need to do length checks since the decoded
      * string must be smaller than the entire json string */
-    json.tmp = strbuf_new(json_len);
+    json.tmp = strbuf_new((int) json_len);
 
     json_next_token(&json, &token);
     json_process_value(l, &json, &token);
diff --git a/src/lib/lua-cjson/strbuf.c b/src/lib/lua-cjson/strbuf.c
index ac779e4a..c3272f09 100644
--- a/src/lib/lua-cjson/strbuf.c
+++ b/src/lib/lua-cjson/strbuf.c
@@ -94,8 +94,8 @@ void strbuf_set_increment(strbuf_t *s, int increment)
 static inline void debug_stats(strbuf_t *s)
 {
     if (s->debug) {
-        fprintf(stderr, "strbuf(%lx) reallocs: %d, length: %d, size: %d\n",
-                (long)s, s->reallocs, s->length, s->size);
+        fprintf(stderr, "strbuf(%p) reallocs: %d, length: %d, size: %d\n",
+                s, s->reallocs, s->length, s->size);
     }
 }
 
@@ -168,8 +168,8 @@ void strbuf_resize(strbuf_t *s, int len)
     newsize = calculate_new_size(s, len);
 
     if (s->debug > 1) {
-        fprintf(stderr, "strbuf(%lx) resize: %d => %d\n",
-                (long)s, s->size, newsize);
+        fprintf(stderr, "strbuf(%p) resize: %d => %d\n",
+                s, s->size, newsize);
     }
 
     s->size = newsize;
diff --git a/src/lib/map/map.c b/src/lib/map/map.c
index 308ccad0..c8d83a97 100644
--- a/src/lib/map/map.c
+++ b/src/lib/map/map.c
@@ -29,7 +29,7 @@ static unsigned map_hash(const char *str) {
 
 static map_node_t *map_newnode(const char *key, void *value, int vsize) {
   map_node_t *node;
-  int ksize = strlen(key) + 1;
+  int ksize = (int) strlen(key) + 1;
   int voffset = ksize + ((sizeof(void*) - ksize) % sizeof(void*));
   node = malloc(sizeof(*node) + voffset + vsize);
   if (!node) return NULL;
diff --git a/src/lib/math.c b/src/lib/math.c
index 44e12a88..fcf7a616 100644
--- a/src/lib/math.c
+++ b/src/lib/math.c
@@ -1,5 +1,4 @@
 #include "math.h"
-#define _USE_MATH_DEFINES
 #include <math.h>
 #include <string.h>
 #ifdef LOVR_USE_SSE
diff --git a/src/lib/sds/sds.c b/src/lib/sds/sds.c
index a1b837c7..8b904959 100644
--- a/src/lib/sds/sds.c
+++ b/src/lib/sds/sds.c
@@ -107,34 +107,34 @@ sds sdsnewlen(const void *init, size_t initlen) {
     fp = ((unsigned char*)s)-1;
     switch(type) {
         case SDS_TYPE_5: {
-            *fp = type | (initlen << SDS_TYPE_BITS);
+            *fp = (unsigned char) (type | (initlen << SDS_TYPE_BITS));
             break;
         }
         case SDS_TYPE_8: {
             SDS_HDR_VAR(8,s);
-            sh->len = initlen;
-            sh->alloc = initlen;
+            sh->len = (uint8_t) initlen;
+            sh->alloc = (uint8_t) initlen;
             *fp = type;
             break;
         }
         case SDS_TYPE_16: {
             SDS_HDR_VAR(16,s);
-            sh->len = initlen;
-            sh->alloc = initlen;
+            sh->len = (uint16_t) initlen;
+            sh->alloc = (uint16_t) initlen;
             *fp = type;
             break;
         }
         case SDS_TYPE_32: {
             SDS_HDR_VAR(32,s);
-            sh->len = initlen;
-            sh->alloc = initlen;
+            sh->len = (uint32_t) initlen;
+            sh->alloc = (uint32_t) initlen;
             *fp = type;
             break;
         }
         case SDS_TYPE_64: {
             SDS_HDR_VAR(64,s);
-            sh->len = initlen;
-            sh->alloc = initlen;
+            sh->len = (uint64_t) initlen;
+            sh->alloc = (uint64_t) initlen;
             *fp = type;
             break;
         }
@@ -472,7 +472,7 @@ int sdsll2str(char *s, long long value) {
         s++;
         p--;
     }
-    return l;
+    return (int) l;
 }
 
 /* Identical sdsll2str(), but for unsigned long long type. */
@@ -501,7 +501,7 @@ int sdsull2str(char *s, unsigned long long v) {
         s++;
         p--;
     }
-    return l;
+    return (int) l;
 }
 
 /* Create an sds string from a long long value. It is much faster than:
@@ -602,7 +602,7 @@ sds sdscatfmt(sds s, char const *fmt, ...) {
 
     va_start(ap,fmt);
     f = fmt;    /* Next format specifier byte to process. */
-    i = initlen; /* Position of the next byte to write to dest str. */
+    i = (long) initlen; /* Position of the next byte to write to dest str. */
     while(*f) {
         char next, *str;
         size_t l;
@@ -628,7 +628,7 @@ sds sdscatfmt(sds s, char const *fmt, ...) {
                 }
                 memcpy(s+i,str,l);
                 sdsinclen(s,l);
-                i += l;
+                i += (long) l;
                 break;
             case 'i':
             case 'I':
@@ -644,7 +644,7 @@ sds sdscatfmt(sds s, char const *fmt, ...) {
                     }
                     memcpy(s+i,buf,l);
                     sdsinclen(s,l);
-                    i += l;
+                    i += (long) l;
                 }
                 break;
             case 'u':
@@ -661,7 +661,7 @@ sds sdscatfmt(sds s, char const *fmt, ...) {
                     }
                     memcpy(s+i,buf,l);
                     sdsinclen(s,l);
-                    i += l;
+                    i += (long) l;
                 }
                 break;
             default: /* Handle %% and generally %<unknown>. */
diff --git a/src/lib/sds/sds.h b/src/lib/sds/sds.h
index f2f6fb97..18209eee 100644
--- a/src/lib/sds/sds.h
+++ b/src/lib/sds/sds.h
@@ -149,20 +149,20 @@ static inline void sdssetlen(sds s, size_t newlen) {
         case SDS_TYPE_5:
             {
                 unsigned char *fp = ((unsigned char*)s)-1;
-                *fp = SDS_TYPE_5 | (newlen << SDS_TYPE_BITS);
+                *fp = (unsigned char) (SDS_TYPE_5 | (newlen << SDS_TYPE_BITS));
             }
             break;
         case SDS_TYPE_8:
-            SDS_HDR(8,s)->len = newlen;
+            SDS_HDR(8,s)->len = (uint8_t) newlen;
             break;
         case SDS_TYPE_16:
-            SDS_HDR(16,s)->len = newlen;
+            SDS_HDR(16,s)->len = (uint16_t) newlen;
             break;
         case SDS_TYPE_32:
-            SDS_HDR(32,s)->len = newlen;
+            SDS_HDR(32,s)->len = (uint32_t) newlen;
             break;
         case SDS_TYPE_64:
-            SDS_HDR(64,s)->len = newlen;
+            SDS_HDR(64,s)->len = (uint64_t) newlen;
             break;
     }
 }
@@ -173,21 +173,21 @@ static inline void sdsinclen(sds s, size_t inc) {
         case SDS_TYPE_5:
             {
                 unsigned char *fp = ((unsigned char*)s)-1;
-                unsigned char newlen = SDS_TYPE_5_LEN(flags)+inc;
-                *fp = SDS_TYPE_5 | (newlen << SDS_TYPE_BITS);
+                unsigned char newlen = (unsigned char) (SDS_TYPE_5_LEN(flags)+inc);
+                *fp = (unsigned char) (SDS_TYPE_5 | (newlen << SDS_TYPE_BITS));
             }
             break;
         case SDS_TYPE_8:
-            SDS_HDR(8,s)->len += inc;
+            SDS_HDR(8,s)->len += (uint8_t) inc;
             break;
         case SDS_TYPE_16:
-            SDS_HDR(16,s)->len += inc;
+            SDS_HDR(16,s)->len += (uint16_t) inc;
             break;
         case SDS_TYPE_32:
-            SDS_HDR(32,s)->len += inc;
+            SDS_HDR(32,s)->len += (uint32_t) inc;
             break;
         case SDS_TYPE_64:
-            SDS_HDR(64,s)->len += inc;
+            SDS_HDR(64,s)->len += (uint64_t) inc;
             break;
     }
 }
@@ -217,16 +217,16 @@ static inline void sdssetalloc(sds s, size_t newlen) {
             /* Nothing to do, this type has no total allocation info. */
             break;
         case SDS_TYPE_8:
-            SDS_HDR(8,s)->alloc = newlen;
+            SDS_HDR(8,s)->alloc = (uint8_t) newlen;
             break;
         case SDS_TYPE_16:
-            SDS_HDR(16,s)->alloc = newlen;
+            SDS_HDR(16,s)->alloc = (uint16_t) newlen;
             break;
         case SDS_TYPE_32:
-            SDS_HDR(32,s)->alloc = newlen;
+            SDS_HDR(32,s)->alloc = (uint32_t) newlen;
             break;
         case SDS_TYPE_64:
-            SDS_HDR(64,s)->alloc = newlen;
+            SDS_HDR(64,s)->alloc = (uint64_t) newlen;
             break;
     }
 }
diff --git a/src/luax.c b/src/luax.c
index ab74dd1b..3191458e 100644
--- a/src/luax.c
+++ b/src/luax.c
@@ -18,7 +18,7 @@ static int luax_meta__gc(lua_State* L) {
 
 static int luax_module__gc(lua_State* L) {
   lua_getfield(L, LUA_REGISTRYINDEX, "_lovrmodules");
-  for (int i = lua_objlen(L, 2); i >= 1; i--) {
+  for (int i = luax_len(L, 2); i >= 1; i--) {
     lua_rawgeti(L, 2, i);
     luax_destructor destructor = (luax_destructor) lua_touserdata(L, -1);
     destructor();
@@ -80,7 +80,7 @@ void luax_atexit(lua_State* L, luax_destructor destructor) {
     lua_setfield(L, LUA_REGISTRYINDEX, "_lovrmodules");
   }
 
-  int length = lua_objlen(L, -1);
+  int length = luax_len(L, -1);
   lua_pushlightuserdata(L, (void*) destructor);
   lua_rawseti(L, -2, length + 1);
   lua_pop(L, 1);
diff --git a/src/luax.h b/src/luax.h
index bf6a047f..96a697ec 100644
--- a/src/luax.h
+++ b/src/luax.h
@@ -10,6 +10,7 @@
 #define LUA_RIDX_MAINTHREAD 1
 #endif
 
+#define luax_len(L, i) (int) lua_objlen(L, i)
 #define luax_totype(L, i, T) ((T*) _luax_totype(L, i, #T))
 #define luax_checktype(L, i, T) ((T*) _luax_checktype(L, i, #T))
 #define luax_checkfloat(L, i) (float) luaL_checknumber(L, i)
diff --git a/src/math/randomGenerator.c b/src/math/randomGenerator.c
index 06af328d..9784c60b 100644
--- a/src/math/randomGenerator.c
+++ b/src/math/randomGenerator.c
@@ -1,5 +1,4 @@
 #include "math/randomGenerator.h"
-#define _USE_MATH_DEFINES
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/src/platform/glfw.h b/src/platform/glfw.h
index 88c04d3d..7efd08a1 100644
--- a/src/platform/glfw.h
+++ b/src/platform/glfw.h
@@ -38,6 +38,7 @@ static int convertMouseButton(MouseButton button) {
   switch (button) {
     case MOUSE_LEFT: return GLFW_MOUSE_BUTTON_LEFT;
     case MOUSE_RIGHT: return GLFW_MOUSE_BUTTON_RIGHT;
+    default: lovrThrow("Unreachable");
   }
 }
 
@@ -53,6 +54,7 @@ static int convertKeyCode(KeyCode key) {
     case KEY_DOWN: return GLFW_KEY_DOWN;
     case KEY_LEFT: return GLFW_KEY_LEFT;
     case KEY_RIGHT: return GLFW_KEY_RIGHT;
+    default: lovrThrow("Unreachable");
   }
 }
 
diff --git a/src/util.h b/src/util.h
index 852fe643..716bea74 100644
--- a/src/util.h
+++ b/src/util.h
@@ -36,6 +36,10 @@
 #define CLAMP(x, min, max) MAX(min, MIN(max, x))
 #define ALIGN(p, n) ((uintptr_t) p & -n)
 
+#ifndef M_PI
+#define M_PI 3.14159265358979323846264f
+#endif
+
 typedef struct ref {
   void (*destructor)(void*);
   const char* type;