From 62717248d4a1f9fcef162083036c64b15f550861 Mon Sep 17 00:00:00 2001
From: salh <salh@fake.com>
Date: Fri, 17 Apr 2026 22:55:03 +0300
Subject: [PATCH] fix(gpu): default point-list expansion in VS for
 particles/trails

D3D12 previously assumed native point-list + geometry-shader expansion; that path can drop or rasterize points incorrectly (invisible missile trails). Default to the shared triangle-strip VS expansion path with an init-time CVar override.

Vulkan: default vulkan_force_expand_point_sprites_in_vs to true for the same behavior on non-D3D12 hosts.
Made-with: Cursor
---
 thirdparty/rexglue-sdk/include/rex/graphics/flags.h   |  1 +
 .../src/graphics/d3d12/primitive_processor.cpp        | 11 ++++++++++-
 .../src/graphics/vulkan/primitive_processor.cpp       |  2 +-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/thirdparty/rexglue-sdk/include/rex/graphics/flags.h b/thirdparty/rexglue-sdk/include/rex/graphics/flags.h
index 72d3a0bf..02319267 100644
--- a/thirdparty/rexglue-sdk/include/rex/graphics/flags.h
+++ b/thirdparty/rexglue-sdk/include/rex/graphics/flags.h
@@ -108,6 +108,7 @@ REXCVAR_DECLARE(bool, d3d12_dxbc_disasm_dxilconv);
 REXCVAR_DECLARE(int32_t, d3d12_pipeline_creation_threads);
 REXCVAR_DECLARE(bool, d3d12_tessellation_wireframe);
 REXCVAR_DECLARE(bool, d3d12_tiled_shared_memory);
+REXCVAR_DECLARE(bool, d3d12_expand_point_sprites_in_vs);
 REXCVAR_DECLARE(std::string, render_target_path_d3d12);
 // Legacy backend compatibility aliases for shared readback controls.
 REXCVAR_DECLARE(bool, d3d12_readback_memexport);
diff --git a/thirdparty/rexglue-sdk/src/graphics/d3d12/primitive_processor.cpp b/thirdparty/rexglue-sdk/src/graphics/d3d12/primitive_processor.cpp
index 500924eb..82295cff 100644
--- a/thirdparty/rexglue-sdk/src/graphics/d3d12/primitive_processor.cpp
+++ b/thirdparty/rexglue-sdk/src/graphics/d3d12/primitive_processor.cpp
@@ -15,6 +15,7 @@
 #include <utility>
 
 #include <rex/assert.h>
+#include <rex/cvar.h>
 #include <rex/graphics/d3d12/command_processor.h>
 #include <rex/graphics/d3d12/deferred_command_list.h>
 #include <rex/graphics/d3d12/primitive_processor.h>
@@ -22,6 +23,13 @@
 #include <rex/ui/d3d12/d3d12_provider.h>
 #include <rex/ui/d3d12/d3d12_util.h>
 
+REXCVAR_DEFINE_BOOL(
+    d3d12_expand_point_sprites_in_vs, true, "GPU/D3D12",
+    "Expand Xbox point lists as triangle strips in the vertex shader instead of the host "
+    "point-list + geometry-shader path. Fixes missing trails/particles on some titles and "
+    "drivers where native point expansion is culled or rasterized incorrectly.")
+    .lifecycle(rex::cvar::Lifecycle::kInitOnly);
+
 namespace rex::graphics::d3d12 {
 
 D3D12PrimitiveProcessor::~D3D12PrimitiveProcessor() {
@@ -29,7 +37,8 @@ D3D12PrimitiveProcessor::~D3D12PrimitiveProcessor() {
 }
 
 bool D3D12PrimitiveProcessor::Initialize() {
-  if (!InitializeCommon(true, false, false, true, true, true)) {
+  const bool point_sprites_native_without_vs = !REXCVAR_GET(d3d12_expand_point_sprites_in_vs);
+  if (!InitializeCommon(true, false, false, true, point_sprites_native_without_vs, true)) {
     Shutdown();
     return false;
   }
diff --git a/thirdparty/rexglue-sdk/src/graphics/vulkan/primitive_processor.cpp b/thirdparty/rexglue-sdk/src/graphics/vulkan/primitive_processor.cpp
index cdbedae5..e439d294 100644
--- a/thirdparty/rexglue-sdk/src/graphics/vulkan/primitive_processor.cpp
+++ b/thirdparty/rexglue-sdk/src/graphics/vulkan/primitive_processor.cpp
@@ -21,7 +21,7 @@
 #include <rex/logging.h>
 #include <rex/ui/vulkan/util.h>
 
-REXCVAR_DEFINE_BOOL(vulkan_force_expand_point_sprites_in_vs, false, "GPU/Vulkan",
+REXCVAR_DEFINE_BOOL(vulkan_force_expand_point_sprites_in_vs, true, "GPU/Vulkan",
                     "Force Vulkan point sprite expansion in the vertex shader, even when geometry "
                     "shaders are available")
     .lifecycle(rex::cvar::Lifecycle::kInitOnly);