diff --git a/bind/v4k.lua b/bind/v4k.lua
index 8ce8872..a547c01 100644
--- a/bind/v4k.lua
+++ b/bind/v4k.lua
@@ -1417,6 +1417,7 @@ typedef struct lightmap_t {
  void fx_enable_all(int enabled);
  char * fx_name(int pass);
  int fx_find(const char *name);
+ void fx_order(int pass, unsigned priority);
  int ui_fx(int pass);
  int ui_fxs();
  void* screenshot(int components);
diff --git a/demos/01-demo2d.c b/demos/01-demo2d.c
index d474c66..b230a8b 100644
--- a/demos/01-demo2d.c
+++ b/demos/01-demo2d.c
@@ -81,10 +81,16 @@ int main() {
 
     // fx: load all post fx files in all subdirs. enable a few filters by default
     fx_load("fx**.fs");
-    fx_enable(fx_find("fxCRT2.fs"), 1);
     fx_enable(fx_find("fxGrain.fs"), 1);
     fx_enable(fx_find("fxContrast.fs"), 1);
     fx_enable(fx_find("fxVignette.fs"), 1);
+    fx_enable(fx_find("fxCRT2.fs"), 1);
+
+    // sort them
+    fx_order(fx_find("fxCRT2.fs"), 1);
+    fx_order(fx_find("fxGrain.fs"), 2);
+    fx_order(fx_find("fxContrast.fs"), 3);
+    fx_order(fx_find("fxVignette.fs"), 4);
 
     // demo loop
     while (window_swap() && !input_down(KEY_ESC)) {
diff --git a/demos/06-material.c b/demos/06-material.c
index 9f06faf..43d9427 100644
--- a/demos/06-material.c
+++ b/demos/06-material.c
@@ -20,7 +20,7 @@ const char *skyboxes[][2] = { // reflection, env, metadata
 
 int main() {
     // create the window
-    window_create( 0.75f, WINDOW_MSAA8 );
+    window_create( 0.75f, 0 );
     window_color( GRAY );
 
     // create camera
@@ -28,6 +28,7 @@ int main() {
 
     // fx: load all post fx files in all subdirs.
     fx_load("fx**.fs");
+    fx_enable(fx_find("fxAces.fs"), 1);
 
     // load video, RGB texture, no audio
     video_t *v = video( "pexels-pachon-in-motion-17486489.mp4", VIDEO_RGB | VIDEO_NO_AUDIO | VIDEO_LOOP ); video_seek(v, 30);
@@ -37,8 +38,8 @@ int main() {
     // load model
     model_t m1 = model("suzanne.obj", MODEL_NO_ANIMATIONS);
     model_t m2 = model("suzanne.obj", MODEL_NO_ANIMATIONS|MODEL_MATCAPS);
-    // model_t m3 = model("damagedhelmet.gltf", MODEL_NO_ANIMATIONS|MODEL_PBR);
-    model_t m3 = model("Scutum_low.fbx", MODEL_NO_ANIMATIONS|MODEL_PBR);
+    model_t m3 = model("damagedhelmet.gltf", MODEL_NO_ANIMATIONS|MODEL_PBR);
+    // model_t m3 = model("Scutum_low.fbx", MODEL_NO_ANIMATIONS|MODEL_PBR);
     // model_t m4 = model("avp/scene.gltf", MODEL_NO_ANIMATIONS|MODEL_PBR);
     // model_t m3 = model("Cerberus_LP.FBX", MODEL_NO_ANIMATIONS|MODEL_PBR);
 
@@ -71,7 +72,7 @@ int main() {
     object_model(obj4, m3);
     object_scale(obj4, vec3(3,3,3));
     object_move(obj4, vec3(-10+6*3,0,-10));
-    object_pivot(obj4, vec3(0,0,90));
+    object_pivot(obj4, vec3(0,90,0));
 
     // spawn object5 (pbr)
     // object_t* obj5 = scene_spawn();
@@ -84,7 +85,7 @@ int main() {
     scene_spawn_light(); // sun
     light_t* l = scene_spawn_light();
     light_type(l, LIGHT_POINT);
-    l->diffuse = vec3(1,0,0);
+    // l->diffuse = vec3(0,0,0);
 
     // load skybox
     scene_get_active()->skybox = skybox_pbr(skyboxes[0][0], skyboxes[0][0], skyboxes[0][1]);
@@ -92,7 +93,7 @@ int main() {
 
     while(window_swap() && !input(KEY_ESC)) {
         // draw environment
-        ddraw_grid(0);
+        // ddraw_grid(0);
 
         // update video
         video_decode( v );
diff --git a/demos/99-lod.c b/demos/99-lod.c
index a897d16..99bfe91 100644
--- a/demos/99-lod.c
+++ b/demos/99-lod.c
@@ -128,7 +128,6 @@ void DrawModel(mesh_t *m) {
     "out vec4 fragcolor;\n"
     "void main() {\n"
         "fragcolor = vec4(v_normal, 1.0);\n" // diffuse
-        "fragcolor.rgb = pow(fragcolor.rgb, vec3(2.2));\n" // diffuse
     "}";
 
     static unsigned program; do_once program = shader(vs, fs, "att_position,att_normal", "fragcolor", NULL);
diff --git a/engine/art/shaders/fs_3_4_skybox_rayleigh.glsl b/engine/art/shaders/fs_3_4_skybox_rayleigh.glsl
index 6f4bbfa..bb68bd1 100644
--- a/engine/art/shaders/fs_3_4_skybox_rayleigh.glsl
+++ b/engine/art/shaders/fs_3_4_skybox_rayleigh.glsl
@@ -8,7 +8,6 @@ uniform float uMieScattering;
 uniform float uRayleighScaleHeight;
 uniform float uMieScaleHeight;
 uniform float uMiePreferredDirection;
-uniform float u_gamma; /// set:2.2
 
 in vec3 v_direction;
 out vec4 fragcolor;
@@ -36,7 +35,6 @@ void main() {
     color = 1.0 - exp(-1.0 * color);
     
     fragcolor = vec4(color, 1);
-    fragcolor.rgb = pow(fragcolor.rgb, vec3(u_gamma));
 }
 
 
diff --git a/engine/art/shaders/pbr.fs b/engine/art/shaders/pbr.fs
index 139a5e2..817415c 100644
--- a/engine/art/shaders/pbr.fs
+++ b/engine/art/shaders/pbr.fs
@@ -472,7 +472,7 @@ void main(void)
     float e = 0.14f;
     color = clamp((x*(a*x+b))/(x*(c*x+d)+e), 0.0, 1.0);
     // gamma correction
-    // color = pow( color, vec3(2.2) );
+    color = pow( color, vec3(1.0/2.2) );
 #endif
 
     // dither with noise.
diff --git a/engine/art/skyboxes/skysphere.fs b/engine/art/skyboxes/skysphere.fs
index abc286f..feffa5a 100644
--- a/engine/art/skyboxes/skysphere.fs
+++ b/engine/art/skyboxes/skysphere.fs
@@ -56,5 +56,4 @@ void main(void) {
     color += vec3( (-1.5/256.) + (3./256.) * dither );
 
     frag_color = vec4( color, 1.0f );
-    frag_color.rgb = pow( frag_color.rgb, vec3(2.2) );
 }
diff --git a/engine/joint/v4k.h b/engine/joint/v4k.h
index 14f5413..2f3a071 100644
--- a/engine/joint/v4k.h
+++ b/engine/joint/v4k.h
@@ -17674,6 +17674,7 @@ API int      fx_enabled(int pass);
 API void     fx_enable_all(int enabled);
 API char *   fx_name(int pass);
 API int      fx_find(const char *name);
+API void     fx_order(int pass, unsigned priority);
 
 API int      ui_fx(int pass);
 API int      ui_fxs();
@@ -372244,6 +372245,8 @@ struct passfx {
     char *name;
     unsigned program;
     int uniforms[16];
+    unsigned priority; // 0xFFFFFF
+    bool enabled;
 };
 
 struct postfx {
@@ -372251,8 +372254,7 @@ struct postfx {
     unsigned fb[2];
     texture_t diffuse[2], depth[2];
     // shader passes
-    passfx pass[64];
-    uint64_t mask;
+    array(passfx) pass;
     // global enable flag
     bool enabled;
     //
@@ -372278,9 +372280,10 @@ void postfx_create(postfx *fx, int flags) {
 }
 
 void postfx_destroy( postfx *fx ) {
-    for( int i = 0; i < 64; ++i ) {
+    for( int i = 0; i < array_count(fx->pass); ++i ) {
         FREE(fx->pass[i].name);
     }
+    array_free(fx->pass);
     texture_destroy(&fx->diffuse[0]);
     texture_destroy(&fx->diffuse[1]);
     texture_destroy(&fx->depth[0]);
@@ -372292,21 +372295,31 @@ void postfx_destroy( postfx *fx ) {
 }
 
 char* postfx_name(postfx *fx, int slot) {
-    return slot < 0 ? "" : fx->pass[ slot & 63 ].name;
+    return slot < 0 || slot >= array_count(fx->pass) ? "" : fx->pass[ slot ].name;
 }
 int postfx_find(postfx *fx, const char *name) {
     name = file_name(name);
-    for( int i = 0; i < 64; ++i) if(!strcmpi(fx->pass[i].name, name)) return i;
+    for( int i = 0; i < array_count(fx->pass); ++i) if(!strcmpi(fx->pass[i].name, name)) return i;
     return -1;
 }
 
+static
+int postfx_sort_fn(const void *a, const void *b) {
+    return ((passfx*)a)->priority - ((passfx*)b)->priority;
+}
+void postfx_order(postfx *fx, int pass, unsigned priority) {
+    if (pass < 0 || pass >= array_count(fx->pass)) return;
+    fx->pass[pass].priority = priority;
+    array_sort(fx->pass, postfx_sort_fn);
+}
+
 int postfx_load_from_mem( postfx *fx, const char *name, const char *fs ) {
     PRINTF("%s\n", name);
     if(!fs || !fs[0]) return -1; // PANIC("!invalid fragment shader");
 
-    int slot = fx->num_loaded++;
-
-    passfx *p = &fx->pass[ slot & 63 ];
+    passfx pass={0};
+    array_push(fx->pass, pass);
+    passfx *p = array_back(fx->pass);
     p->name = STRDUP(name);
 
     // preload stuff
@@ -372357,31 +372370,35 @@ int postfx_load_from_mem( postfx *fx, const char *name, const char *fs ) {
     
     // set quad
     glGenVertexArrays(1, &p->m.vao);
-    return slot;
+    return array_count(fx->pass)-1;
 }
 
 bool postfx_enable(postfx *fx, int pass, bool enabled) {
-    if( pass < 0 ) return false;
-    fx->mask = enabled ? fx->mask | (1ull << pass) : fx->mask & ~(1ull << pass);
-    fx->enabled = !!popcnt64(fx->mask);
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
+    fx->pass[pass].enabled = enabled;
+    fx->enabled = !!array_count(fx->pass);
     return fx->enabled;
 }
 
 bool postfx_enabled(postfx *fx, int pass) {
-    if( pass < 0 ) return false;
-    return (!!(fx->mask & (1ull << pass)));
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
+    return fx->pass[pass].enabled;
 }
 
 bool postfx_toggle(postfx *fx, int pass) {
-    if( pass < 0 ) return false;
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
     return postfx_enable(fx, pass, 1 ^ postfx_enabled(fx, pass));
 }
 
 void postfx_clear(postfx *fx) {
-    fx->mask = fx->enabled = 0;
+    for (int i = 0; i < array_count(fx->pass); i++) {
+        fx->pass[i].enabled = 0;
+    }
+    fx->enabled = 0;
 }
 
 int ui_postfx(postfx *fx, int pass) {
+    if (pass < 0 || pass >= array_count(fx->pass)) return 0;
     int on = ui_enabled();
     ( postfx_enabled(fx,pass) ? ui_enable : ui_disable )();
     int rc = ui_shader(fx->pass[pass].program);
@@ -372389,6 +372406,15 @@ int ui_postfx(postfx *fx, int pass) {
     return rc;
 }
 
+static
+int postfx_active_passes(postfx *fx) {
+    int num_passes = 0;
+    for (int i = 0; i < array_count(fx->pass); i++)
+        if (fx->pass[i].enabled)
+            ++num_passes;
+    return num_passes;
+}
+
 bool postfx_begin(postfx *fx, int width, int height) {
     // reset clear color: needed in case transparent window is being used (alpha != 0)
     glClearColor(0,0,0,0); // @transparent
@@ -372416,7 +372442,7 @@ bool postfx_begin(postfx *fx, int width, int height) {
         fx->fb[1] = fbo(fx->diffuse[1].id, fx->depth[1].id, 0);
     }
 
-    uint64_t num_active_passes = popcnt64(fx->mask);
+    uint64_t num_active_passes = postfx_active_passes(fx);
     bool active = fx->enabled && num_active_passes;
     if( !active ) {
         return false;
@@ -372436,7 +372462,7 @@ bool postfx_begin(postfx *fx, int width, int height) {
 }
 
 bool postfx_end(postfx *fx) {
-    uint64_t num_active_passes = popcnt64(fx->mask);
+    uint64_t num_active_passes = postfx_active_passes(fx);
     bool active = fx->enabled && num_active_passes;
     if( !active ) {
         return false;
@@ -372456,10 +372482,9 @@ bool postfx_end(postfx *fx) {
     float mx = input(MOUSE_X);
     float my = input(MOUSE_Y);
 
-    for(int i = 0, e = countof(fx->pass); i < e; ++i) {
-        if( fx->mask & (1ull << i) ) {
-            passfx *pass = &fx->pass[i];
-
+    for(int i = 0, e = array_count(fx->pass); i < e; ++i) {
+        passfx *pass = &fx->pass[i];
+        if( pass->enabled ) {
             if( !pass->program ) { --num_active_passes; continue; }
             glUseProgram(pass->program);
 
@@ -372557,6 +372582,9 @@ char *fx_name(int pass) {
 int fx_find(const char *name) {
     return postfx_find(&fx, name);
 }
+void fx_order(int pass, unsigned priority) {
+    postfx_order(&fx, pass, priority);
+}
 int ui_fx(int pass) {
     return ui_postfx(&fx, pass);
 }
diff --git a/engine/split/v4k_render.c b/engine/split/v4k_render.c
index 82db3d1..dd26857 100644
--- a/engine/split/v4k_render.c
+++ b/engine/split/v4k_render.c
@@ -2226,6 +2226,8 @@ struct passfx {
     char *name;
     unsigned program;
     int uniforms[16];
+    unsigned priority; // 0xFFFFFF
+    bool enabled;
 };
 
 struct postfx {
@@ -2233,8 +2235,7 @@ struct postfx {
     unsigned fb[2];
     texture_t diffuse[2], depth[2];
     // shader passes
-    passfx pass[64];
-    uint64_t mask;
+    array(passfx) pass;
     // global enable flag
     bool enabled;
     //
@@ -2260,9 +2261,10 @@ void postfx_create(postfx *fx, int flags) {
 }
 
 void postfx_destroy( postfx *fx ) {
-    for( int i = 0; i < 64; ++i ) {
+    for( int i = 0; i < array_count(fx->pass); ++i ) {
         FREE(fx->pass[i].name);
     }
+    array_free(fx->pass);
     texture_destroy(&fx->diffuse[0]);
     texture_destroy(&fx->diffuse[1]);
     texture_destroy(&fx->depth[0]);
@@ -2274,21 +2276,31 @@ void postfx_destroy( postfx *fx ) {
 }
 
 char* postfx_name(postfx *fx, int slot) {
-    return slot < 0 ? "" : fx->pass[ slot & 63 ].name;
+    return slot < 0 || slot >= array_count(fx->pass) ? "" : fx->pass[ slot ].name;
 }
 int postfx_find(postfx *fx, const char *name) {
     name = file_name(name);
-    for( int i = 0; i < 64; ++i) if(!strcmpi(fx->pass[i].name, name)) return i;
+    for( int i = 0; i < array_count(fx->pass); ++i) if(!strcmpi(fx->pass[i].name, name)) return i;
     return -1;
 }
 
+static
+int postfx_sort_fn(const void *a, const void *b) {
+    return ((passfx*)a)->priority - ((passfx*)b)->priority;
+}
+void postfx_order(postfx *fx, int pass, unsigned priority) {
+    if (pass < 0 || pass >= array_count(fx->pass)) return;
+    fx->pass[pass].priority = priority;
+    array_sort(fx->pass, postfx_sort_fn);
+}
+
 int postfx_load_from_mem( postfx *fx, const char *name, const char *fs ) {
     PRINTF("%s\n", name);
     if(!fs || !fs[0]) return -1; // PANIC("!invalid fragment shader");
 
-    int slot = fx->num_loaded++;
-
-    passfx *p = &fx->pass[ slot & 63 ];
+    passfx pass={0};
+    array_push(fx->pass, pass);
+    passfx *p = array_back(fx->pass);
     p->name = STRDUP(name);
 
     // preload stuff
@@ -2339,31 +2351,35 @@ int postfx_load_from_mem( postfx *fx, const char *name, const char *fs ) {
     
     // set quad
     glGenVertexArrays(1, &p->m.vao);
-    return slot;
+    return array_count(fx->pass)-1;
 }
 
 bool postfx_enable(postfx *fx, int pass, bool enabled) {
-    if( pass < 0 ) return false;
-    fx->mask = enabled ? fx->mask | (1ull << pass) : fx->mask & ~(1ull << pass);
-    fx->enabled = !!popcnt64(fx->mask);
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
+    fx->pass[pass].enabled = enabled;
+    fx->enabled = !!array_count(fx->pass);
     return fx->enabled;
 }
 
 bool postfx_enabled(postfx *fx, int pass) {
-    if( pass < 0 ) return false;
-    return (!!(fx->mask & (1ull << pass)));
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
+    return fx->pass[pass].enabled;
 }
 
 bool postfx_toggle(postfx *fx, int pass) {
-    if( pass < 0 ) return false;
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
     return postfx_enable(fx, pass, 1 ^ postfx_enabled(fx, pass));
 }
 
 void postfx_clear(postfx *fx) {
-    fx->mask = fx->enabled = 0;
+    for (int i = 0; i < array_count(fx->pass); i++) {
+        fx->pass[i].enabled = 0;
+    }
+    fx->enabled = 0;
 }
 
 int ui_postfx(postfx *fx, int pass) {
+    if (pass < 0 || pass >= array_count(fx->pass)) return 0;
     int on = ui_enabled();
     ( postfx_enabled(fx,pass) ? ui_enable : ui_disable )();
     int rc = ui_shader(fx->pass[pass].program);
@@ -2371,6 +2387,15 @@ int ui_postfx(postfx *fx, int pass) {
     return rc;
 }
 
+static
+int postfx_active_passes(postfx *fx) {
+    int num_passes = 0;
+    for (int i = 0; i < array_count(fx->pass); i++)
+        if (fx->pass[i].enabled)
+            ++num_passes;
+    return num_passes;
+}
+
 bool postfx_begin(postfx *fx, int width, int height) {
     // reset clear color: needed in case transparent window is being used (alpha != 0)
     glClearColor(0,0,0,0); // @transparent
@@ -2398,7 +2423,7 @@ bool postfx_begin(postfx *fx, int width, int height) {
         fx->fb[1] = fbo(fx->diffuse[1].id, fx->depth[1].id, 0);
     }
 
-    uint64_t num_active_passes = popcnt64(fx->mask);
+    uint64_t num_active_passes = postfx_active_passes(fx);
     bool active = fx->enabled && num_active_passes;
     if( !active ) {
         return false;
@@ -2418,7 +2443,7 @@ bool postfx_begin(postfx *fx, int width, int height) {
 }
 
 bool postfx_end(postfx *fx) {
-    uint64_t num_active_passes = popcnt64(fx->mask);
+    uint64_t num_active_passes = postfx_active_passes(fx);
     bool active = fx->enabled && num_active_passes;
     if( !active ) {
         return false;
@@ -2438,10 +2463,9 @@ bool postfx_end(postfx *fx) {
     float mx = input(MOUSE_X);
     float my = input(MOUSE_Y);
 
-    for(int i = 0, e = countof(fx->pass); i < e; ++i) {
-        if( fx->mask & (1ull << i) ) {
-            passfx *pass = &fx->pass[i];
-
+    for(int i = 0, e = array_count(fx->pass); i < e; ++i) {
+        passfx *pass = &fx->pass[i];
+        if( pass->enabled ) {
             if( !pass->program ) { --num_active_passes; continue; }
             glUseProgram(pass->program);
 
@@ -2539,6 +2563,9 @@ char *fx_name(int pass) {
 int fx_find(const char *name) {
     return postfx_find(&fx, name);
 }
+void fx_order(int pass, unsigned priority) {
+    postfx_order(&fx, pass, priority);
+}
 int ui_fx(int pass) {
     return ui_postfx(&fx, pass);
 }
diff --git a/engine/split/v4k_render.h b/engine/split/v4k_render.h
index 8de3286..5611b37 100644
--- a/engine/split/v4k_render.h
+++ b/engine/split/v4k_render.h
@@ -652,6 +652,7 @@ API int      fx_enabled(int pass);
 API void     fx_enable_all(int enabled);
 API char *   fx_name(int pass);
 API int      fx_find(const char *name);
+API void     fx_order(int pass, unsigned priority);
 
 API int      ui_fx(int pass);
 API int      ui_fxs();
diff --git a/engine/v4k.c b/engine/v4k.c
index 0ad3568..c4bc261 100644
--- a/engine/v4k.c
+++ b/engine/v4k.c
@@ -19398,6 +19398,8 @@ struct passfx {
     char *name;
     unsigned program;
     int uniforms[16];
+    unsigned priority; // 0xFFFFFF
+    bool enabled;
 };
 
 struct postfx {
@@ -19405,8 +19407,7 @@ struct postfx {
     unsigned fb[2];
     texture_t diffuse[2], depth[2];
     // shader passes
-    passfx pass[64];
-    uint64_t mask;
+    array(passfx) pass;
     // global enable flag
     bool enabled;
     //
@@ -19432,9 +19433,10 @@ void postfx_create(postfx *fx, int flags) {
 }
 
 void postfx_destroy( postfx *fx ) {
-    for( int i = 0; i < 64; ++i ) {
+    for( int i = 0; i < array_count(fx->pass); ++i ) {
         FREE(fx->pass[i].name);
     }
+    array_free(fx->pass);
     texture_destroy(&fx->diffuse[0]);
     texture_destroy(&fx->diffuse[1]);
     texture_destroy(&fx->depth[0]);
@@ -19446,21 +19448,31 @@ void postfx_destroy( postfx *fx ) {
 }
 
 char* postfx_name(postfx *fx, int slot) {
-    return slot < 0 ? "" : fx->pass[ slot & 63 ].name;
+    return slot < 0 || slot >= array_count(fx->pass) ? "" : fx->pass[ slot ].name;
 }
 int postfx_find(postfx *fx, const char *name) {
     name = file_name(name);
-    for( int i = 0; i < 64; ++i) if(!strcmpi(fx->pass[i].name, name)) return i;
+    for( int i = 0; i < array_count(fx->pass); ++i) if(!strcmpi(fx->pass[i].name, name)) return i;
     return -1;
 }
 
+static
+int postfx_sort_fn(const void *a, const void *b) {
+    return ((passfx*)a)->priority - ((passfx*)b)->priority;
+}
+void postfx_order(postfx *fx, int pass, unsigned priority) {
+    if (pass < 0 || pass >= array_count(fx->pass)) return;
+    fx->pass[pass].priority = priority;
+    array_sort(fx->pass, postfx_sort_fn);
+}
+
 int postfx_load_from_mem( postfx *fx, const char *name, const char *fs ) {
     PRINTF("%s\n", name);
     if(!fs || !fs[0]) return -1; // PANIC("!invalid fragment shader");
 
-    int slot = fx->num_loaded++;
-
-    passfx *p = &fx->pass[ slot & 63 ];
+    passfx pass={0};
+    array_push(fx->pass, pass);
+    passfx *p = array_back(fx->pass);
     p->name = STRDUP(name);
 
     // preload stuff
@@ -19511,31 +19523,35 @@ int postfx_load_from_mem( postfx *fx, const char *name, const char *fs ) {
     
     // set quad
     glGenVertexArrays(1, &p->m.vao);
-    return slot;
+    return array_count(fx->pass)-1;
 }
 
 bool postfx_enable(postfx *fx, int pass, bool enabled) {
-    if( pass < 0 ) return false;
-    fx->mask = enabled ? fx->mask | (1ull << pass) : fx->mask & ~(1ull << pass);
-    fx->enabled = !!popcnt64(fx->mask);
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
+    fx->pass[pass].enabled = enabled;
+    fx->enabled = !!array_count(fx->pass);
     return fx->enabled;
 }
 
 bool postfx_enabled(postfx *fx, int pass) {
-    if( pass < 0 ) return false;
-    return (!!(fx->mask & (1ull << pass)));
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
+    return fx->pass[pass].enabled;
 }
 
 bool postfx_toggle(postfx *fx, int pass) {
-    if( pass < 0 ) return false;
+    if( pass < 0 || pass >= array_count(fx->pass) ) return false;
     return postfx_enable(fx, pass, 1 ^ postfx_enabled(fx, pass));
 }
 
 void postfx_clear(postfx *fx) {
-    fx->mask = fx->enabled = 0;
+    for (int i = 0; i < array_count(fx->pass); i++) {
+        fx->pass[i].enabled = 0;
+    }
+    fx->enabled = 0;
 }
 
 int ui_postfx(postfx *fx, int pass) {
+    if (pass < 0 || pass >= array_count(fx->pass)) return 0;
     int on = ui_enabled();
     ( postfx_enabled(fx,pass) ? ui_enable : ui_disable )();
     int rc = ui_shader(fx->pass[pass].program);
@@ -19543,6 +19559,15 @@ int ui_postfx(postfx *fx, int pass) {
     return rc;
 }
 
+static
+int postfx_active_passes(postfx *fx) {
+    int num_passes = 0;
+    for (int i = 0; i < array_count(fx->pass); i++)
+        if (fx->pass[i].enabled)
+            ++num_passes;
+    return num_passes;
+}
+
 bool postfx_begin(postfx *fx, int width, int height) {
     // reset clear color: needed in case transparent window is being used (alpha != 0)
     glClearColor(0,0,0,0); // @transparent
@@ -19570,7 +19595,7 @@ bool postfx_begin(postfx *fx, int width, int height) {
         fx->fb[1] = fbo(fx->diffuse[1].id, fx->depth[1].id, 0);
     }
 
-    uint64_t num_active_passes = popcnt64(fx->mask);
+    uint64_t num_active_passes = postfx_active_passes(fx);
     bool active = fx->enabled && num_active_passes;
     if( !active ) {
         return false;
@@ -19590,7 +19615,7 @@ bool postfx_begin(postfx *fx, int width, int height) {
 }
 
 bool postfx_end(postfx *fx) {
-    uint64_t num_active_passes = popcnt64(fx->mask);
+    uint64_t num_active_passes = postfx_active_passes(fx);
     bool active = fx->enabled && num_active_passes;
     if( !active ) {
         return false;
@@ -19610,10 +19635,9 @@ bool postfx_end(postfx *fx) {
     float mx = input(MOUSE_X);
     float my = input(MOUSE_Y);
 
-    for(int i = 0, e = countof(fx->pass); i < e; ++i) {
-        if( fx->mask & (1ull << i) ) {
-            passfx *pass = &fx->pass[i];
-
+    for(int i = 0, e = array_count(fx->pass); i < e; ++i) {
+        passfx *pass = &fx->pass[i];
+        if( pass->enabled ) {
             if( !pass->program ) { --num_active_passes; continue; }
             glUseProgram(pass->program);
 
@@ -19711,6 +19735,9 @@ char *fx_name(int pass) {
 int fx_find(const char *name) {
     return postfx_find(&fx, name);
 }
+void fx_order(int pass, unsigned priority) {
+    postfx_order(&fx, pass, priority);
+}
 int ui_fx(int pass) {
     return ui_postfx(&fx, pass);
 }
diff --git a/engine/v4k.h b/engine/v4k.h
index 69834f1..3519545 100644
--- a/engine/v4k.h
+++ b/engine/v4k.h
@@ -3741,6 +3741,7 @@ API int      fx_enabled(int pass);
 API void     fx_enable_all(int enabled);
 API char *   fx_name(int pass);
 API int      fx_find(const char *name);
+API void     fx_order(int pass, unsigned priority);
 
 API int      ui_fx(int pass);
 API int      ui_fxs();