From 8c0777b5472dad3fdd67d434b37c4df6c559e883 Mon Sep 17 00:00:00 2001
From: asrael <asrael@pxl8.org>
Date: Fri, 6 Feb 2026 00:35:52 -0600
Subject: [PATCH] add stats with f4 toggle

---
 demo/mod/first_person3d.fnl | 20 ++---------------
 src/core/pxl8.c             | 44 +++++++++++++++++++++++++++++++------
 src/core/pxl8_game.h        |  5 ++---
 src/gfx/pxl8_gfx.c          | 11 ++++++++++
 src/gfx/pxl8_gfx.h          | 16 +++++++-------
 src/gfx/pxl8_render.c       | 27 +++++++++++++++++++++++
 src/gfx/pxl8_render.h       |  1 +
 7 files changed, 88 insertions(+), 36 deletions(-)

diff --git a/demo/mod/first_person3d.fnl b/demo/mod/first_person3d.fnl
index c0051dd..81d25be 100644
--- a/demo/mod/first_person3d.fnl
+++ b/demo/mod/first_person3d.fnl
@@ -39,8 +39,6 @@
 (var camera nil)
 (var ceiling-tex nil)
 (var floor-tex nil)
-(var fps-avg 0)
-(var fps-sample-count 0)
 (var grounded true)
 (var land-squash 0)
 (var last-dt 0.016)
@@ -178,14 +176,6 @@
 
 (fn update [dt]
   (set last-dt dt)
-  (let [fps (pxl8.get_fps)]
-    (set fps-sample-count (+ fps-sample-count 1))
-    (set fps-avg (+ (* fps-avg (/ (- fps-sample-count 1) fps-sample-count))
-                    (/ fps fps-sample-count)))
-    (when (>= fps-sample-count 120)
-      (set fps-sample-count 0)
-      (set fps-avg 0)))
-
   (setup-materials)
 
   (when (> portal-cooldown 0)
@@ -380,15 +370,9 @@
       (let [cx (/ (pxl8.get_width) 2)
             cy (/ (pxl8.get_height) 2)
             crosshair-size 4
-            crosshair-color 240
-            text-color 251]
+            crosshair-color 240]
         (pxl8.line (- cx crosshair-size) cy (+ cx crosshair-size) cy crosshair-color)
-        (pxl8.line cx (- cy crosshair-size) cx (+ cy crosshair-size) crosshair-color)
-
-        (pxl8.text (.. "fps: " (string.format "%.0f" fps-avg)) 5 5 text-color)
-        (pxl8.text (.. "pos: " (string.format "%.0f" cam-x) ","
-                       (string.format "%.0f" cam-y) ","
-                       (string.format "%.0f" cam-z)) 5 15 text-color))
+        (pxl8.line cx (- cy crosshair-size) cx (+ cy crosshair-size) crosshair-color))
       (pxl8.pop_target)))))
 
 {:preload preload
diff --git a/src/core/pxl8.c b/src/core/pxl8.c
index ac06e7d..758efb8 100644
--- a/src/core/pxl8.c
+++ b/src/core/pxl8.c
@@ -335,13 +335,10 @@ pxl8_result pxl8_update(pxl8* sys) {
 
     game->last_time = current_time;
     game->time += dt;
-    game->fps_accumulator += dt;
-    game->fps_frame_count++;
+    game->dt = dt;
 
-    if (game->fps_accumulator >= 1.0f) {
-        game->fps = (f32)game->fps_frame_count / game->fps_accumulator;
-        game->fps_accumulator = 0.0f;
-        game->fps_frame_count = 0;
+    if (pxl8_key_pressed(&game->input, "f4")) {
+        game->debug_stats = !game->debug_stats;
     }
 
 #ifndef NDEBUG
@@ -450,10 +447,41 @@ pxl8_result pxl8_frame(pxl8* sys) {
         }
     }
 
+    if (game->debug_stats) {
+        const pxl8_gfx_stats* stats = pxl8_gfx_get_stats(game->gfx);
+        char buf[64];
+        i32 y = 4;
+
+        if (stats) {
+            snprintf(buf, sizeof(buf), "FPS: %.0f", stats->fps);
+            pxl8_2d_text(game->gfx, buf, 4, y, 15);
+            y += 10;
+
+            pxl8_sim_entity* player = pxl8_world_local_player(game->world);
+            if (player) {
+                snprintf(buf, sizeof(buf), "Pos: %.0f,%.0f,%.0f",
+                    player->pos.x, player->pos.y, player->pos.z);
+                pxl8_2d_text(game->gfx, buf, 4, y, 15);
+                y += 10;
+            }
+
+            snprintf(buf, sizeof(buf), "Draw: %llu  Tri: %llu",
+                (unsigned long long)stats->draw_calls,
+                (unsigned long long)stats->triangles);
+            pxl8_2d_text(game->gfx, buf, 4, y, 15);
+            y += 10;
+
+            snprintf(buf, sizeof(buf), "Raster: %.2fms", stats->raster_ms);
+            pxl8_2d_text(game->gfx, buf, 4, y, 15);
+        }
+    }
+
     pxl8_gfx_set_viewport(game->gfx, pxl8_gfx_viewport(bounds, pxl8_gfx_get_width(game->gfx), pxl8_gfx_get_height(game->gfx)));
     pxl8_gfx_upload_framebuffer(game->gfx);
     pxl8_gfx_present(game->gfx);
 
+    pxl8_gfx_update_stats(game->gfx, game->dt);
+
     memset(game->input.keys_pressed, 0, sizeof(game->input.keys_pressed));
     memset(game->input.keys_released, 0, sizeof(game->input.keys_released));
     memset(game->input.mouse_buttons_pressed, 0, sizeof(game->input.mouse_buttons_pressed));
@@ -531,7 +559,9 @@ pxl8_world* pxl8_get_world(pxl8* sys) {
 }
 
 f32 pxl8_get_fps(const pxl8* sys) {
-    return (sys && sys->game) ? sys->game->fps : 0.0f;
+    if (!sys || !sys->game) return 0.0f;
+    const pxl8_gfx_stats* stats = pxl8_gfx_get_stats(sys->game->gfx);
+    return stats ? stats->fps : 0.0f;
 }
 
 pxl8_gfx* pxl8_get_gfx(const pxl8* sys) {
diff --git a/src/core/pxl8_game.h b/src/core/pxl8_game.h
index e93eb18..20faf14 100644
--- a/src/core/pxl8_game.h
+++ b/src/core/pxl8_game.h
@@ -15,9 +15,8 @@ typedef struct pxl8_game {
     pxl8_replay* debug_replay;
 #endif
 
-    f32 fps;
-    f32 fps_accumulator;
-    i32 fps_frame_count;
+    bool debug_stats;
+    f32 dt;
     i32 frame_count;
     pxl8_gfx* gfx;
     pxl8_input_state input;
diff --git a/src/gfx/pxl8_gfx.c b/src/gfx/pxl8_gfx.c
index 42642af..3d2b2ed 100644
--- a/src/gfx/pxl8_gfx.c
+++ b/src/gfx/pxl8_gfx.c
@@ -19,6 +19,9 @@
 #include "pxl8_sys.h"
 #include "pxl8_types.h"
 
+void pxl8_renderer_update_stats(pxl8_renderer* r, f32 dt);
+pxl8_gfx_stats* pxl8_renderer_get_stats(pxl8_renderer* r);
+
 #define PXL8_MAX_TARGET_STACK 8
 
 typedef struct pxl8_sprite_cache_entry {
@@ -1043,3 +1046,11 @@ bool pxl8_gfx_get_wireframe(const pxl8_gfx* gfx) {
 u8 pxl8_gfx_get_ambient(const pxl8_gfx* gfx) {
     return gfx ? gfx->frame.uniforms.ambient : 0;
 }
+
+const pxl8_gfx_stats* pxl8_gfx_get_stats(const pxl8_gfx* gfx) {
+    return gfx ? pxl8_renderer_get_stats(gfx->renderer) : NULL;
+}
+
+void pxl8_gfx_update_stats(pxl8_gfx* gfx, f32 dt) {
+    if (gfx) pxl8_renderer_update_stats(gfx->renderer, dt);
+}
diff --git a/src/gfx/pxl8_gfx.h b/src/gfx/pxl8_gfx.h
index c9141c7..81b83cf 100644
--- a/src/gfx/pxl8_gfx.h
+++ b/src/gfx/pxl8_gfx.h
@@ -13,15 +13,12 @@ typedef struct pxl8_gfx pxl8_gfx;
 
 typedef struct pxl8_gfx_stats {
     u64 draw_calls;
-    u64 triangles;
-    u64 clipped_triangles;
-    u64 depth_tests;
-    u64 depth_passes;
-    u64 shader_calls;
-    u64 pixels_written;
-    u64 submit_ns;
-    u64 execute_draw_ns;
+    f32 dt_accumulator;
+    f32 fps;
+    u32 frame_count;
+    f32 raster_ms;
     u64 raster_ns;
+    u64 triangles;
 } pxl8_gfx_stats;
 
 typedef enum pxl8_gfx_effect {
@@ -77,6 +74,9 @@ u8 pxl8_gfx_ui_color(pxl8_gfx* gfx, u8 index);
 void pxl8_gfx_set_wireframe(pxl8_gfx* gfx, bool enabled);
 bool pxl8_gfx_get_wireframe(const pxl8_gfx* gfx);
 
+const pxl8_gfx_stats* pxl8_gfx_get_stats(const pxl8_gfx* gfx);
+void pxl8_gfx_update_stats(pxl8_gfx* gfx, f32 dt);
+
 u8 pxl8_gfx_get_ambient(const pxl8_gfx* gfx);
 
 #ifdef __cplusplus
diff --git a/src/gfx/pxl8_render.c b/src/gfx/pxl8_render.c
index 7fca76d..ee7954a 100644
--- a/src/gfx/pxl8_render.c
+++ b/src/gfx/pxl8_render.c
@@ -740,6 +740,7 @@ struct pxl8_renderer {
     u32 scissor_w, scissor_h;
 
     pxl8_shader_fn shader;
+    pxl8_gfx_stats stats;
 };
 
 struct pxl8_gfx_cmdbuf {
@@ -782,6 +783,28 @@ void pxl8_renderer_set_shader(pxl8_renderer* r, pxl8_shader_fn fn) {
     if (r) r->shader = fn;
 }
 
+void pxl8_renderer_update_stats(pxl8_renderer* r, f32 dt) {
+    if (!r) return;
+
+    r->stats.dt_accumulator += dt;
+    r->stats.frame_count++;
+
+    if (r->stats.frame_count >= 60) {
+        r->stats.fps = (f32)r->stats.frame_count / r->stats.dt_accumulator;
+        r->stats.raster_ms = ((f32)r->stats.raster_ns / (f32)r->stats.frame_count) / 1000000.0f;
+        r->stats.dt_accumulator = 0.0f;
+        r->stats.raster_ns = 0;
+        r->stats.frame_count = 0;
+    }
+
+    r->stats.draw_calls = 0;
+    r->stats.triangles = 0;
+}
+
+pxl8_gfx_stats* pxl8_renderer_get_stats(pxl8_renderer* r) {
+    return r ? &r->stats : NULL;
+}
+
 static u32 texture_byte_size(pxl8_gfx_texture_format fmt, u32 w, u32 h) {
     switch (fmt) {
         case PXL8_GFX_FORMAT_INDEXED8: return w * h;
@@ -1090,6 +1113,7 @@ static void execute_draw(
     pxl8_renderer* r,
     const pxl8_gfx_cmd_draw* cmd
 ) {
+    r->stats.draw_calls++;
     if (!VALID_BUF(r, cmd->vertex_buffer)) return;
     bool use_indices = pxl8_gfx_handle_valid(cmd->index_buffer) && VALID_BUF(r, cmd->index_buffer);
     if (!VALID_PASS(r, r->current_pass)) return;
@@ -1186,6 +1210,7 @@ static void execute_draw(
     bool is_wireframe = pip->desc.rasterizer.fill == PXL8_GFX_FILL_WIREFRAME;
 
     for (u32 i = cmd->first_index; i < cmd->first_index + cmd->index_count; i += 3) {
+        r->stats.triangles++;
         u16 i0, i1, i2;
 
         if (use_indices) {
@@ -1295,8 +1320,10 @@ static void execute_draw(
                     continue;
                 }
 
+                u64 raster_start = pxl8_get_ticks_ns();
                 rasterize_triangle(&setup, fb, zb, fb_w, shader, &pip->desc,
                     &shader_bindings, &shader_uniforms);
+                r->stats.raster_ns += pxl8_get_ticks_ns() - raster_start;
             }
         }
     }
diff --git a/src/gfx/pxl8_render.h b/src/gfx/pxl8_render.h
index f3a43df..04c624f 100644
--- a/src/gfx/pxl8_render.h
+++ b/src/gfx/pxl8_render.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "pxl8_colormap.h"
+#include "pxl8_gfx.h"
 #include "pxl8_render_types.h"
 #include "pxl8_shader.h"