diff --git a/meson.build b/meson.build
index 00cbe5d..8c8fa50 100644
--- a/meson.build
+++ b/meson.build
@@ -16,7 +16,7 @@ freeimage_dep = cc.find_library('freeimage')
 
 executable(
   'shadertool',
-  sources: ['src/main.c', 'src/renderer.c', 'src/shaders.c', 'src/log.c'],
+  sources: ['src/main.c', 'src/renderer.c', 'src/shaders.c', 'src/io.c', 'src/log.c'],
   dependencies: [glfw_dep, glew_dep, freeimage_dep],
   c_args: '-DLOG_USE_COLOR',
 )
diff --git a/src/io.c b/src/io.c
new file mode 100644
index 0000000..96b6b57
--- /dev/null
+++ b/src/io.c
@@ -0,0 +1,129 @@
+#include <FreeImage.h>
+#include <errno.h>
+#include <libgen.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/inotify.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "renderer.h"
+#include "shaders.h"
+
+#define BUF_LEN (10 * (sizeof(struct inotify_event) + 1))
+
+/**
+ * @brief Return the file name without the leading directories and
+ * without the extension.
+ *
+ * @param filename The original filename.
+ * @return A newly allocated string containing the output of basename(3)
+ * without the extension.
+ */
+char *basename_without_suffix(const char *filename) {
+  char *name = strdup(filename);
+  name = basename(name);
+  log_debug("%s", name);
+  char *dot = strrchr(name, '.');
+  if (!dot || dot == name) {
+    return name;
+  }
+  *dot = '\0';
+  log_debug("%s", name);
+  return name;
+}
+
+/**
+ * @brief Capture a screenshot of the current window.
+ *
+ * Takes the dimensions of the viewport to save a pixel array of the
+ * same dimensions. Uses FreeImage to create an image from the raw
+ * pixels and save it to disk.
+ *
+ * @param state The renderer state, needed to get the name of the
+ * current shader and the frame count.
+ */
+void capture_screenshot(struct renderer_state *state) {
+  time_t now = time(NULL);
+  struct tm *timenow = gmtime(&now);
+  char image_filename[255] = {0};
+  char *shader_basename =
+      basename_without_suffix(state->screen_shader.filename);
+  snprintf(image_filename, sizeof(image_filename),
+           "%s_%zu_%d%02d%02d_%02d%02d%02d.png", shader_basename,
+           state->frame_count, timenow->tm_year + 1900, timenow->tm_mon,
+           timenow->tm_mday, timenow->tm_hour, timenow->tm_min,
+           timenow->tm_sec);
+
+  int viewport[4] = {0};
+  glGetIntegerv(GL_VIEWPORT, viewport);
+
+  GLubyte *pixels = calloc(3 * viewport[2] * viewport[3], 1);
+  glReadPixels(0, 0, viewport[2], viewport[3], GL_BGR, GL_UNSIGNED_BYTE,
+               pixels);
+
+  FIBITMAP *image = FreeImage_ConvertFromRawBits(
+      pixels, viewport[2], viewport[3], 3 * viewport[2], 24, FI_RGBA_RED_MASK,
+      FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK, false);
+
+  if (FreeImage_Save(FIF_PNG, image, image_filename, 0)) {
+    log_debug("Image saved to %s", image_filename);
+  } else {
+    log_error("Failed to saved image to %s", image_filename);
+  }
+
+  FreeImage_Unload(image);
+  free(pixels);
+}
+
+/**
+ * @brief Ensure the window is closed when the user presses the escape
+ * key.
+ *
+ * @param state The current state of the renderer.
+ */
+void process_input(struct renderer_state *state) {
+  bool should_reload = false;
+
+  // Skip inotify checking if it's not available
+  if (state->inotify_fd != -1 &&
+      (state->screen_shader.wd != -1 || state->buffer_shader.wd != -1)) {
+    char buf[BUF_LEN] = {0};
+    int num_read = read(state->inotify_fd, buf, BUF_LEN);
+    if (num_read == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
+      // No event, do nothing
+    } else if (num_read <= 0) {
+      log_error("[inotify] Could not read inotify state");
+    } else {
+      should_reload = true;
+    }
+  }
+
+  if (glfwGetKey(state->window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
+    log_info("Quitting");
+    glfwSetWindowShouldClose(state->window, true);
+  } else if (should_reload ||
+             glfwGetKey(state->window, GLFW_KEY_R) == GLFW_PRESS) {
+    if (should_reload) {
+      log_info("File changed on disk, reloading shaders");
+    } else {
+      log_info("Reloading shaders");
+    }
+    // reinitialize time and frame count
+    state->frame_count = 0;
+    state->prev_frame_count = 0;
+    glfwSetTime(0.0);
+    state->time = 0.0;
+    state->prev_time = 0.0;
+    // recompile shaders
+    compile_shaders(&state->screen_shader.program,
+                    state->screen_shader.filename);
+    if (state->buffer_shader.filename) {
+      compile_shaders(&state->buffer_shader.program,
+                      state->buffer_shader.filename);
+    }
+  } else if (glfwGetKey(state->window, GLFW_KEY_S) == GLFW_PRESS) {
+    capture_screenshot(state);
+  }
+}
diff --git a/src/io.h b/src/io.h
new file mode 100644
index 0000000..3a5a541
--- /dev/null
+++ b/src/io.h
@@ -0,0 +1,10 @@
+#ifndef IO_H
+#define IO_H
+
+#include "renderer.h"
+
+char *basename_without_suffix(const char *filename);
+void capture_screenshot(struct renderer_state *state);
+void process_input(struct renderer_state *state);
+
+#endif /* IO_H */
diff --git a/src/main.c b/src/main.c
index 4ba3548..f27ac98 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <sys/inotify.h>
 
+#include "io.h"
 #include "log.h"
 #include "renderer.h"
 #include "shaders.h"
diff --git a/src/renderer.c b/src/renderer.c
index 7840566..07b06ce 100644
--- a/src/renderer.c
+++ b/src/renderer.c
@@ -1,20 +1,10 @@
-#include <FreeImage.h>
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
-#include <errno.h>
-#include <libgen.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/inotify.h>
-#include <time.h>
-#include <unistd.h>
 
 #include "log.h"
 #include "renderer.h"
-#include "shaders.h"
 
 #define UNUSED(a) (void)a
-#define BUF_LEN (10 * (sizeof(struct inotify_event) + 1))
 
 /**
  * @brief Initialize GLFW and OpenGL, and create a window.
@@ -152,118 +142,3 @@ void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
   UNUSED(window);
   glViewport(0, 0, width, height);
 }
-
-/**
- * @brief Return the file name without the leading directories and
- * without the extension.
- *
- * @param filename The original filename.
- * @return A newly allocated string containing the output of basename(3)
- * without the extension.
- */
-char *basename_without_suffix(const char *filename) {
-  char *name = strdup(filename);
-  name = basename(name);
-  log_debug("%s", name);
-  char *dot = strrchr(name, '.');
-  if (!dot || dot == name) {
-    return name;
-  }
-  *dot = '\0';
-  log_debug("%s", name);
-  return name;
-}
-
-/**
- * @brief Capture a screenshot of the current window.
- *
- * Takes the dimensions of the viewport to save a pixel array of the
- * same dimensions. Uses FreeImage to create an image from the raw
- * pixels and save it to disk.
- *
- * @param state The renderer state, needed to get the name of the
- * current shader and the frame count.
- */
-void capture_screenshot(struct renderer_state *state) {
-  time_t now = time(NULL);
-  struct tm *timenow = gmtime(&now);
-  char image_filename[255] = {0};
-  char *shader_basename =
-      basename_without_suffix(state->screen_shader.filename);
-  snprintf(image_filename, sizeof(image_filename),
-           "%s_%zu_%d%02d%02d_%02d%02d%02d.png", shader_basename,
-           state->frame_count, timenow->tm_year + 1900, timenow->tm_mon,
-           timenow->tm_mday, timenow->tm_hour, timenow->tm_min,
-           timenow->tm_sec);
-
-  int viewport[4] = {0};
-  glGetIntegerv(GL_VIEWPORT, viewport);
-
-  GLubyte *pixels = calloc(3 * viewport[2] * viewport[3], 1);
-  glReadPixels(0, 0, viewport[2], viewport[3], GL_BGR, GL_UNSIGNED_BYTE,
-               pixels);
-
-  FIBITMAP *image = FreeImage_ConvertFromRawBits(
-      pixels, viewport[2], viewport[3], 3 * viewport[2], 24, FI_RGBA_RED_MASK,
-      FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK, false);
-
-  if (FreeImage_Save(FIF_PNG, image, image_filename, 0)) {
-    log_debug("Image saved to %s", image_filename);
-  } else {
-    log_error("Failed to saved image to %s", image_filename);
-  }
-
-  FreeImage_Unload(image);
-  free(pixels);
-}
-
-/**
- * @brief Ensure the window is closed when the user presses the escape
- * key.
- *
- * @param state The current state of the renderer.
- */
-void process_input(struct renderer_state *state) {
-  bool should_reload = false;
-
-  // Skip inotify checking if it's not available
-  if (state->inotify_fd != -1 &&
-      (state->screen_shader.wd != -1 || state->buffer_shader.wd != -1)) {
-    char buf[BUF_LEN] = {0};
-    int num_read = read(state->inotify_fd, buf, BUF_LEN);
-    if (num_read == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
-      // No event, do nothing
-    } else if (num_read <= 0) {
-      log_error("[inotify] Could not read inotify state");
-    } else {
-      should_reload = true;
-    }
-  }
-
-  if (glfwGetKey(state->window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
-    log_info("Quitting");
-    glfwSetWindowShouldClose(state->window, true);
-  } else if (should_reload ||
-             glfwGetKey(state->window, GLFW_KEY_R) == GLFW_PRESS) {
-    if (should_reload) {
-      log_info("File changed on disk, reloading shaders");
-    } else {
-      log_info("Reloading shaders");
-    }
-    // reinitialize time and frame count
-    state->frame_count = 0;
-    state->prev_frame_count = 0;
-    glfwSetTime(0.0);
-    state->time = 0.0;
-    state->prev_time = 0.0;
-    // recompile shaders
-    compile_shaders(&state->screen_shader.program,
-                    state->screen_shader.filename);
-    if (state->buffer_shader.filename) {
-      compile_shaders(&state->buffer_shader.program,
-                      state->buffer_shader.filename);
-    }
-  } else if (glfwGetKey(state->window, GLFW_KEY_S) == GLFW_PRESS) {
-    capture_screenshot(state);
-  }
-}
diff --git a/src/renderer.h b/src/renderer.h
index d694be4..e5fe9a5 100644
--- a/src/renderer.h
+++ b/src/renderer.h
@@ -34,8 +34,5 @@ unsigned int initialize_framebuffer(unsigned int *framebuffer,
                                     unsigned int texture_width,
                                     unsigned int texture_height);
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
-char *basename_without_suffix(const char *filename);
-void capture_screenshot(struct renderer_state *state);
-void process_input(struct renderer_state *state);
 
 #endif /* RENDERER_H */