diff --git a/src/game_object/twn_dynamic_game_object.c b/src/game_object/twn_dynamic_game_object.c
index 5604e17..72a9354 100644
--- a/src/game_object/twn_dynamic_game_object.c
+++ b/src/game_object/twn_dynamic_game_object.c
@@ -55,7 +55,7 @@ static void game_object_file_action(char const *path, enum FilewatchAction actio
 
 #pragma GCC diagnostic pop
 
-    if (fabsf(0.0f - ctx.game.frame_number) > 0.00001f) {
+    if (ctx.game.frame_number != 0.0f) {
         log_info("Game object was reloaded\n");
         reset_state();
     }
diff --git a/src/rendering/twn_billboards.c b/src/rendering/twn_billboards.c
index cae6b66..cc29e66 100644
--- a/src/rendering/twn_billboards.c
+++ b/src/rendering/twn_billboards.c
@@ -26,8 +26,8 @@ void draw_billboard(char const *texture,
         batch_p = &ctx.billboard_batches[hmlenu(ctx.billboard_batches) - 1]; /* TODO: can last index be used? */
     }
 
-    bool const texture_region_valid = fabsf(texture_region.w - texture_region.h) > 0.00001f
-                                   && fabsf(0.0f - texture_region.w) > 0.00001f;
+    bool const texture_region_valid = texture_region.h != 0.0f
+                                   && texture_region.w != 0.0f;
 
     struct SpaceBillboard billboard = {
         .color = color,
diff --git a/src/rendering/twn_draw.c b/src/rendering/twn_draw.c
index 6ef9ac0..30c9ccf 100644
--- a/src/rendering/twn_draw.c
+++ b/src/rendering/twn_draw.c
@@ -433,7 +433,7 @@ TWN_API void draw_camera_2d(Vec2 position,
 
 /* TODO: check for NaNs and alike */
 void draw_camera(Vec3 position, Vec3 direction, Vec3 up, float fov, float zoom, float draw_distance) {
-    bool const orthographic = fabsf(0.0f - fov) < 0.00001f;
+    bool const orthographic = fov == 0.0f;
     if (!orthographic && fov >= (float)(M_PI))
         log_warn("Invalid fov given (%f)", (double)fov);
 
@@ -467,7 +467,7 @@ DrawCameraFromPrincipalAxesResult draw_camera_from_principal_axes(Vec3 position,
                                                                   float zoom,
                                                                   float draw_distance)
 {
-    bool const orthographic = fabsf(0.0f - fov) < 0.00001f;
+    bool const orthographic = fov == 0.0f;
     if (!orthographic && fov >= (float)(M_PI))
         log_warn("Invalid fov given (%f)", (double)fov);
 
@@ -504,7 +504,7 @@ DrawCameraUnprojectResult draw_camera_unproject(Vec2 point,
                                                 float zoom,
                                                 float draw_distance)
 {
-    bool const orthographic = fabsf(0.0f - fov) < 0.00001f;
+    bool const orthographic = fov == 0.0f;
     if (!orthographic && fov >= (float)(M_PI))
         log_warn("Invalid fov given (%f)", (double)fov);
 
diff --git a/src/rendering/twn_gl_15_rendering.c b/src/rendering/twn_gl_15_rendering.c
index 6fe7dec..f5a9c11 100644
--- a/src/rendering/twn_gl_15_rendering.c
+++ b/src/rendering/twn_gl_15_rendering.c
@@ -78,7 +78,7 @@ void start_render_frame(void) {
 
 
 void end_render_frame(void) {
-    if (!ctx.render_double_buffered || (fabsf(1.0f - ctx.game.frame_number) < 0.00001f)) {
+    if (!ctx.render_double_buffered || ctx.game.frame_number == 0.0f) {
         issue_deferred_draw_commands();
         SDL_GL_SwapWindow(ctx.window);
         arrsetlen(deferred_commands, 0);
@@ -561,7 +561,7 @@ void finally_draw_command(DeferredCommandDraw command) {
     glDepthRange(command.depth_range_low, command.depth_range_high);
 
     /* TODO: cache it for constant parameters, which is a common case */
-    if (command.pipeline == PIPELINE_SPACE && fabsf(0.0f - ctx.game_copy.fog_density) >= 0.00001f) {
+    if (command.pipeline == PIPELINE_SPACE && ctx.game_copy.fog_density != 0.0f) {
         glEnable(GL_FOG);
 
         /* clamp to valid range */
diff --git a/src/rendering/twn_sprites.c b/src/rendering/twn_sprites.c
index ecec32f..4f7c6bb 100644
--- a/src/rendering/twn_sprites.c
+++ b/src/rendering/twn_sprites.c
@@ -28,8 +28,8 @@ void draw_sprite(char const *path,
 {
     /* if .w and .h are zeroed then assume whole region */
     /* TODO: don't check here, just move to redner code ? */
-    bool const texture_region_valid = fabsf(texture_region.w - texture_region.h) > 0.00001f
-                                   && fabsf(0.0f - texture_region.w) > 0.00001f;
+    bool const texture_region_valid = texture_region.h != 0.0f
+                                   && texture_region.w != 0.0f;
 
     SpritePrimitive sprite = {
         .rect = rect,
diff --git a/src/twn_engine_context_c.h b/src/twn_engine_context_c.h
index 38389e9..1d71567 100644
--- a/src/twn_engine_context_c.h
+++ b/src/twn_engine_context_c.h
@@ -52,7 +52,6 @@ typedef struct EngineContext {
     MeshBatchItem *quad_batches;
     struct LineBatchItem {
         struct LineBatchItemKey {
-            Color color;
             uint8_t thickness;
         } key;
         struct LinePrimitive value;