From 0692e0c8b7966de529c009e2e1171ded29f4e79d Mon Sep 17 00:00:00 2001
From: Daniel Bross <daniel@brossferatu.com>
Date: Sun, 15 Jun 2025 15:07:16 +0200
Subject: [PATCH] Added dynamic size for max particles in particle systems,
 added fallback texture

---
 core/particles.jai    |  4 ++--
 renderer/renderer.jai | 20 ++++++++++++++++----
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/core/particles.jai b/core/particles.jai
index 3063591..d409ab5 100644
--- a/core/particles.jai
+++ b/core/particles.jai
@@ -37,11 +37,11 @@ Particle_System :: struct {
     scene: *Scene;
 }
 
-create_particle_system :: (pipeline: Pipeline_State_Handle, update_func: (*Particle_System, float), owning_entity: *Entity = null, scene: *Scene = null) -> *Particle_System {
+create_particle_system :: (pipeline: Pipeline_State_Handle, update_func: (*Particle_System, float), owning_entity: *Entity = null, scene: *Scene = null, max_particles := MAX_PARTICLES) -> *Particle_System {
     lvl := ifx scene == null then engine.current_scene else scene;
     particle_system, locator := find_and_occupy_empty_slot(*scene.particle_systems);
     particle_system._locator = locator;
-    particle_system.vertex_buffer = create_vertex_buffer(engine.renderer, null, size_of(Particle_Vertex) * MAX_PARTICLES, stride=size_of(Particle_Vertex), mappable=true);
+    particle_system.vertex_buffer = create_vertex_buffer(engine.renderer, null, xx (size_of(Particle_Vertex) * max_particles), stride=size_of(Particle_Vertex), mappable=true);
     particle_system.pipeline = pipeline;
     particle_system.on_particle_update = update_func;
     particle_system.owning_entity = owning_entity;
diff --git a/renderer/renderer.jai b/renderer/renderer.jai
index c1c7449..3decf30 100644
--- a/renderer/renderer.jai
+++ b/renderer/renderer.jai
@@ -630,6 +630,10 @@ Renderer :: struct {
         clamp : Sampler_Handle;
     }
 
+    default_textures : struct {
+        fallback : Texture_Handle;
+    }
+
     watcher: File_Watcher(string);
 
     vsync: bool = true;
@@ -684,6 +688,11 @@ create_renderer :: (window: *Window) -> *Renderer {
 
     engine.renderer.render_graph = new_render_graph();
 
+
+    data := u8.[255]; 
+
+    engine.renderer.default_textures.fallback = create_texture(engine.renderer, data.data, 1, 1, 1, "engine/fallback", generate_mips=false, .R8_UNORM);
+
     return engine.renderer;
 }
 
@@ -972,11 +981,14 @@ create_texture :: (using renderer: *Renderer, path: string, generate_mips: bool
     data : [32] u8;
     stbi_load_from_memory(data.data, 32, *image_width, *image_height, *image_channels, image_desired_channels);
 
-    assert(image_data != null);
+    if image_data {
+        defer stbi_image_free(image_data);
 
-    defer stbi_image_free(image_data);
-
-    return create_texture(renderer, image_data, xx image_width, xx image_height, xx image_desired_channels, path, generate_mips=generate_mips, format);
+        return create_texture(renderer, image_data, xx image_width, xx image_height, xx image_desired_channels, path, generate_mips=generate_mips, format);
+    } else {
+        log_error("Unable to load texture '%'\n", path);
+        return renderer.default_textures.fallback;
+    }
 }
 
 create_texture :: (using renderer: *Renderer, data: *void, width: u32, height: u32, channels: u32, path: string = "", generate_mips: bool = true, format: Format = .R8G8B8A8_UNORM_SRGB) -> Texture_Handle {