diff --git a/source/blender/blenkernel/BKE_pointcache.h b/source/blender/blenkernel/BKE_pointcache.h
index b529c3193bb..b9b46d3f245 100644
--- a/source/blender/blenkernel/BKE_pointcache.h
+++ b/source/blender/blenkernel/BKE_pointcache.h
@@ -170,9 +170,9 @@ typedef struct PTCacheBaker {
   struct Scene *scene;
   struct ViewLayer *view_layer;
   struct Depsgraph *depsgraph;
-  int bake;
-  int render;
-  int anim_init;
+  bool bake;
+  bool render;
+  bool anim_init;
   int quick_step;
   struct PTCacheID pid;
 
diff --git a/source/blender/render/RE_pipeline.h b/source/blender/render/RE_pipeline.h
index 2002e97679d..79a5918da89 100644
--- a/source/blender/render/RE_pipeline.h
+++ b/source/blender/render/RE_pipeline.h
@@ -71,7 +71,7 @@ typedef struct RenderPass {
   char view[64];     /* EXR_VIEW_MAXNAME */
   int view_id;       /* quick lookup */
 
-  int pad;
+  char _pad0[4];
 } RenderPass;
 
 /**
@@ -130,7 +130,7 @@ typedef struct RenderResult {
   int framenr;
 
   /* for acquire image, to indicate if it there is a combined layer */
-  int have_combined;
+  bool have_combined;
 
   /* render info text */
   char *text;
@@ -356,7 +356,7 @@ void RE_RenderAnim(struct Render *re,
 void RE_RenderFreestyleStrokes(struct Render *re,
                                struct Main *bmain,
                                struct Scene *scene,
-                               int render);
+                               bool render);
 void RE_RenderFreestyleExternal(struct Render *re);
 #endif
 
@@ -415,7 +415,7 @@ void *RE_gpu_context_get(Render *re);
  */
 float RE_filter_value(int type, float x);
 
-int RE_seq_render_active(struct Scene *scene, struct RenderData *rd);
+bool RE_seq_render_active(struct Scene *scene, struct RenderData *rd);
 
 /**
  * Used in the interface to decide whether to show layers or passes.
diff --git a/source/blender/render/intern/pipeline.cc b/source/blender/render/intern/pipeline.cc
index 34e04e1662c..c74b7df6a65 100644
--- a/source/blender/render/intern/pipeline.cc
+++ b/source/blender/render/intern/pipeline.cc
@@ -1020,30 +1020,32 @@ static void do_render_compositor_scene(Render *re, Scene *sce, int cfra)
   do_render_engine(resc);
 }
 
-/* helper call to detect if this scene needs a render,
- * or if there's a any render layer to render. */
-static int compositor_needs_render(Scene *sce, int this_scene)
+/**
+ * Helper call to detect if this scene needs a render,
+ * or if there's a any render layer to render.
+ */
+static bool compositor_needs_render(Scene *sce, const bool this_scene)
 {
   bNodeTree *ntree = sce->nodetree;
 
   if (ntree == nullptr) {
-    return 1;
+    return true;
   }
   if (sce->use_nodes == false) {
-    return 1;
+    return true;
   }
   if ((sce->r.scemode & R_DOCOMP) == 0) {
-    return 1;
+    return true;
   }
 
   for (const bNode *node : ntree->all_nodes()) {
     if (node->type == CMP_NODE_R_LAYERS && (node->flag & NODE_MUTED) == 0) {
       if (this_scene == 0 || node->id == nullptr || node->id == &sce->id) {
-        return 1;
+        return true;
       }
     }
   }
-  return 0;
+  return false;
 }
 
 /* Render all scenes within a compositor node tree. */
@@ -1102,9 +1104,9 @@ static void render_compositor_stats(void *arg, const char *str)
 static void do_render_compositor(Render *re)
 {
   bNodeTree *ntree = re->pipeline_scene_eval->nodetree;
-  int update_newframe = 0;
+  bool update_newframe = false;
 
-  if (compositor_needs_render(re->pipeline_scene_eval, 1)) {
+  if (compositor_needs_render(re->pipeline_scene_eval, true)) {
     /* render the frames
      * it could be optimized to render only the needed view
      * but what if a scene has a different number of views
@@ -1125,8 +1127,8 @@ static void do_render_compositor(Render *re)
 
     BLI_rw_mutex_unlock(&re->resultmutex);
 
-    /* scene render process already updates animsys */
-    update_newframe = 1;
+    /* Scene render process already updates animsys. */
+    update_newframe = true;
   }
 
   /* swap render result */
@@ -1204,21 +1206,21 @@ static void renderresult_stampinfo(Render *re)
   }
 }
 
-int RE_seq_render_active(Scene *scene, RenderData *rd)
+bool RE_seq_render_active(Scene *scene, RenderData *rd)
 {
   Editing *ed = scene->ed;
 
   if (!(rd->scemode & R_DOSEQ) || !ed || !ed->seqbase.first) {
-    return 0;
+    return false;
   }
 
   LISTBASE_FOREACH (Sequence *, seq, &ed->seqbase) {
     if (seq->type != SEQ_TYPE_SOUND_RAM) {
-      return 1;
+      return true;
     }
   }
 
-  return 0;
+  return false;
 }
 
 /* Render sequencer strips into render result. */
@@ -1574,7 +1576,7 @@ bool RE_is_rendering_allowed(Scene *scene,
 static void update_physics_cache(Render *re,
                                  Scene *scene,
                                  ViewLayer *view_layer,
-                                 int /*anim_init*/)
+                                 const bool /*anim_init*/)
 {
   PTCacheBaker baker;
 
@@ -1583,9 +1585,9 @@ static void update_physics_cache(Render *re,
   baker.scene = scene;
   baker.view_layer = view_layer;
   baker.depsgraph = BKE_scene_ensure_depsgraph(re->main, scene, view_layer);
-  baker.bake = 0;
-  baker.render = 1;
-  baker.anim_init = 1;
+  baker.bake = false;
+  baker.render = true;
+  baker.anim_init = true;
   baker.quick_step = 1;
 
   BKE_ptcache_bake(&baker);
@@ -1608,8 +1610,8 @@ static bool render_init_from_main(Render *re,
                                   Scene *scene,
                                   ViewLayer *single_layer,
                                   Object *camera_override,
-                                  int anim,
-                                  int anim_init)
+                                  const bool anim,
+                                  const bool anim_init)
 {
   int winx, winy;
   rcti disprect;
@@ -1755,7 +1757,8 @@ void RE_RenderFrame(Render *re,
   scene->r.cfra = frame;
   scene->r.subframe = subframe;
 
-  if (render_init_from_main(re, &scene->r, bmain, scene, single_layer, camera_override, 0, 0)) {
+  if (render_init_from_main(
+          re, &scene->r, bmain, scene, single_layer, camera_override, false, false)) {
     RenderData rd;
     memcpy(&rd, &scene->r, sizeof(rd));
     MEM_reset_peak_memory();
@@ -1825,10 +1828,10 @@ static bool use_eevee_for_freestyle_render(Render *re)
   return !(type->flag & RE_USE_CUSTOM_FREESTYLE);
 }
 
-void RE_RenderFreestyleStrokes(Render *re, Main *bmain, Scene *scene, int render)
+void RE_RenderFreestyleStrokes(Render *re, Main *bmain, Scene *scene, const bool render)
 {
   re->result_ok = false;
-  if (render_init_from_main(re, &scene->r, bmain, scene, nullptr, nullptr, 0, 0)) {
+  if (render_init_from_main(re, &scene->r, bmain, scene, nullptr, nullptr, false, false)) {
     if (render) {
       char scene_engine[32];
       BLI_strncpy(scene_engine, re->r.engine, sizeof(scene_engine));
@@ -2095,7 +2098,7 @@ void RE_RenderAnim(Render *re,
                                   (rd.im_format.views_format == R_IMF_VIEWS_INDIVIDUAL));
 
   /* do not fully call for each frame, it initializes & pops output window */
-  if (!render_init_from_main(re, &rd, bmain, scene, single_layer, camera_override, 0, 1)) {
+  if (!render_init_from_main(re, &rd, bmain, scene, single_layer, camera_override, false, true)) {
     return;
   }
 
@@ -2182,7 +2185,7 @@ void RE_RenderAnim(Render *re,
       render_update_depsgraph(re);
 
       /* Only border now, TODO(ton): camera lens. */
-      render_init_from_main(re, &rd, bmain, scene, single_layer, camera_override, 1, 0);
+      render_init_from_main(re, &rd, bmain, scene, single_layer, camera_override, true, false);
 
       if (nfra != scene->r.cfra) {
         /* Skip this frame, but could update for physics and particles system. */
diff --git a/source/blender/render/intern/render_types.h b/source/blender/render/intern/render_types.h
index 418acbca3b1..9a3dedc7036 100644
--- a/source/blender/render/intern/render_types.h
+++ b/source/blender/render/intern/render_types.h
@@ -113,6 +113,10 @@ struct Render {
 
   RenderStats i;
 
+  /**
+   * Optional report list which may be null (borrowed memory).
+   * Callers to rendering functions are responsible for setting can clearing, see: #RE_SetReports.
+   */
   struct ReportList *reports;
 
   void **movie_ctx_arr;