Vram checks

mod.json

@@ -53,10 +53,10 @@
         },
         "history-length": {
             "name": "History length",
-            "description": "The length of rewind history stored, in capture frame count.",
+            "description": "The length of rewind history stored, in capture frame count. This will be attempted to be automatically populated on windows machines with Nvidia or AMD graphics cards by the amount of video memory available.",
             "type": "int",
             "min": 20,
-            "max": 400,
+            "max": 500,
             "default": {
                 "android": 140,
                 "ios": 140,

src/hooks/MenuLayer.cpp

@@ -0,0 +1,50 @@
+#ifdef GEODE_IS_WINDOWS
+#include "MenuLayer.hpp"
+#include <Geode/cocos/platform/third_party/win32/OGLES/GL/glew.h>
+
+// populate defaults by getting amount of system vram
+bool HookedMenuLayer::init() {
+    if (!MenuLayer::init()) return false;
+
+    auto mod = geode::Mod::get();
+
+    bool hasSetRecommended = mod->getSavedValue<bool>("has-set-recommended", false);
+    if (hasSetRecommended) return true;
+    mod->setSavedValue<bool>("has-set-recommended", true);
+
+    // https://stackoverflow.com/a/5695427
+    // no intel support very sad
+    int values[4] = {};
+    glGetIntegerv(GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX, values); // nvidia
+    glGetIntegerv(GL_TEXTURE_FREE_MEMORY_ATI, values); // amd (ati)
+
+    if (values[0] == 0) {
+        geode::log::info("No data returned from vram checks :( ({}, {}, {}, {})", values[0], values[1], values[2], values[3]);
+        return true;
+    }
+
+    int kb = values[0];
+    int frames = (kb / 42000) + 80; // https://www.desmos.com/calculator/m2hlel1fjj
+
+    geode::log::info("Video memory checks returned {}kb (approx), mapped to {} frames", kb, frames);
+
+    frames = std::max(20, std::min(frames, 500));
+
+    mod->setSettingValue<int64_t>("history-length", frames);
+
+    auto pop = FLAlertLayer::create(
+        "Rewind",
+        fmt::format(
+            "Rewind has automagically detected <cy>{}GB</c> of video memory free, and "
+            "has set the <cj>max history length</c> to <cy>{}</c>, which can be customised in "
+            "the <co>mod settings</c>.",
+            kb / 1000000, frames
+        ).c_str(),
+        "ok"
+    );
+    pop->m_scene = this;
+    pop->show();
+
+    return true;
+}
+#endif

src/hooks/MenuLayer.hpp

@@ -0,0 +1,9 @@
+#pragma once
+#ifdef GEODE_IS_WINDOWS
+#include <Geode/modify/MenuLayer.hpp>
+
+class $modify(HookedMenuLayer, MenuLayer) {
+    bool init();
+};
+
+#endif

src/settings.cpp

@@ -18,4 +18,4 @@
             fields->m_resolutionMultiplier = geode::Mod::get()->getSettingValue<double>("resolution-multiplier");
         }
     });
-};
+}