diff --git a/src/entity.cpp b/src/entity.cpp
new file mode 100644
index 0000000..1bece4d
--- /dev/null
+++ b/src/entity.cpp
@@ -0,0 +1,46 @@
+
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "entity.h"
+
+
+bool
+initEntity(Entity* e,
+	MemoryArena* arena,
+	model* mdl,
+	u32 num_attrib_mappings,
+	GLBufferToAttribMapping* attrib_mappings,
+	const char* name)
+{
+	e->num_meshes = mdl->num_meshes;
+	e->meshes = ARENA_ALLOC(arena, GLmesh, e->num_meshes);
+	e->xform = ARENA_ALLOC(arena, glm::mat4, 1);
+	*e->xform = glm::mat4(1.f);
+	e->name = arenaCopyCStr(arena, name);
+
+	for (u32 i = 0; i< e->num_meshes; i++) {
+		GLmesh* glm = &e->meshes[i];
+		*glm = loadGLMesh(mdl->meshes[i], GL_TRIANGLES, glm::vec3(0, 0, 0),
+				num_attrib_mappings, attrib_mappings);
+
+		if (glm->vao_id == 0) {
+			printf("%s(), error initializing entity\n", __FUNCTION__);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+void
+setEntityPosition(Entity* e, glm::vec3 pos)
+{
+	*e->xform = glm::translate(*e->xform, pos);
+}
+
+void
+rotateEntity(Entity* e, glm::vec3 axis, float radians)
+{
+	*e->xform = glm::rotate(*e->xform, radians, axis);
+}
+
diff --git a/src/entity.h b/src/entity.h
new file mode 100644
index 0000000..e7a1bf0
--- /dev/null
+++ b/src/entity.h
@@ -0,0 +1,30 @@
+
+#pragma once
+
+#include "asset.h"
+#include "shader.h"
+#include "types.h"
+#include "util.h"
+
+
+struct Entity
+{
+	u32 num_meshes;
+	GLmesh* meshes;
+	GLTexture* diffuse_texture;	// NOTE: pointer into gl_ctx->textures array
+	glm::mat4* xform;
+	char* name;
+};
+
+
+bool initEntity(Entity* e,
+	MemoryArena* arena,
+	model* mdl,
+	u32 num_attrib_mappings,
+	GLBufferToAttribMapping* attrib_mappings,
+	const char* name = "");
+
+void setEntityPosition(Entity* e, glm::vec3 pos);
+
+void rotateEntity(Entity* e, glm::vec3 axis, float radians);
+
diff --git a/src/main.cpp b/src/main.cpp
index d19fdae..b162909 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,9 +4,9 @@
 #include <iostream>
 
 #include <SDL2/SDL.h>
-#include <glm/gtc/matrix_transform.hpp>
 
 #include "asset.h"
+#include "entity.h"
 #include "dumbLog.h"
 #include "GLDebug.h"
 #include "shader.h"
@@ -25,15 +25,6 @@ struct SDLHandles
 // TODO: node/tree structure for entities
 struct Node;
 
-struct Entity
-{
-	u32 num_meshes;
-	GLmesh* meshes;
-	GLTexture* diffuse_texture;	// NOTE: pointer into gl_ctx->textures array
-	glm::mat4* xform;
-	char* name;
-};
-
 struct RenderGroup
 {
 	shader_program* shader;
@@ -93,58 +84,6 @@ getFreeEntity(RenderGroup* rg)
 	return nullptr;
 }
 
-bool
-initEntity(Entity* e,
-	MemoryArena* arena,
-	model* mdl,
-	u32 num_attrib_mappings,
-	GLBufferToAttribMapping* attrib_mappings,
-	const char* name = "")
-{
-	e->num_meshes = mdl->num_meshes;
-	e->meshes = ARENA_ALLOC(arena, GLmesh, e->num_meshes);
-	e->xform = ARENA_ALLOC(arena, glm::mat4, 1);
-	*e->xform = glm::mat4(1.f);
-	e->name = arenaCopyCStr(arena, name);
-
-	for (u32 i = 0; i< e->num_meshes; i++) {
-		GLmesh* glm = &e->meshes[i];
-		*glm = loadGLMesh(mdl->meshes[i], GL_TRIANGLES, glm::vec3(0, 0, 0),
-				num_attrib_mappings, attrib_mappings);
-
-		if (glm->vao_id == 0) {
-			printf("%s(), error initializing entity\n", __FUNCTION__);
-			return false;
-		}
-	}
-
-	return true;
-}
-
-void
-setEntityPosition(Entity* e, glm::vec3 pos)
-{
-	*e->xform = glm::translate(*e->xform, pos);
-}
-
-void
-rotateEntity(Entity* e, glm::vec3 axis, float radians)
-{
-	*e->xform = glm::rotate(*e->xform, radians, axis);
-}
-
-// NOTE: equivalent to rgAppend() in libTangerine
-model*
-getModelByPath(RenderState* rs, const char* filepath)
-{
-	model* mdl = assetGetCachedModel(&rs->assets, utilFNV64a_str(filepath));
-
-	if (!mdl)
-		mdl = assetLoadFromFile(&rs->assets, rs->assets.arena, filepath);
-
-	return mdl;
-}
-
 RenderGroup*
 getFreeRenderGroup(RenderState* rs)
 {
diff --git a/src/shader.h b/src/shader.h
index cdb30dc..18e2dd1 100644
--- a/src/shader.h
+++ b/src/shader.h
@@ -6,6 +6,7 @@
 #include <glm/glm.hpp>
 
 #include "types.h"
+#include "util.h"
 
 
 struct gl_uniform
diff --git a/src/types.h b/src/types.h
index 4b893a7..7068408 100644
--- a/src/types.h
+++ b/src/types.h
@@ -1,6 +1,9 @@
 
 #pragma once
 
+#include <cstdint>
+
+
 typedef uint8_t u8;
 typedef int32_t i32;
 typedef uint16_t u16;