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[Feat] (MG_Config, MG_Util): a preference knob and POST rows for Magma's multi-draw tiers

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MOBILEGL_MAGMA_MULTIDRAW_MODE=ext|indirect|unroll|auto selects the
DirectVulkan multi-draw dispatch tier, clamped to what the device
supports with one INFO line when it falls back; auto (and unset) picks
the best supported tier. Invalid values keep auto. Magma-only: the
variable has no effect on DirectGLES. Note for the escape hatch:
mode=unroll also forces the GL indirect multi-draw paths onto their
per-command loop, where gl_DrawID reads 0 for every sub-draw -
Flywheel-style content that keys on flw_drawId renders accordingly.

Three DriverPost rows per the POST rule: VK_EXT_multi_draw
(PASS/INFO), the multiDrawIndirect feature (WARN downgraded to INFO -
there is always a fallback tier), and the resolved dispatch tier with
the full chain. drawIndirectFirstInstance gains a row too, since the
indirect tier's legality check now relies on it.
This commit is contained in:
BZLZHH
2026-08-07 06:41:21 -04:00
parent d5f5e6405b
commit 231d5c90e4
3 changed files with 73 additions and 2 deletions
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MobileGL/ConfigLoader.cpp
+20
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@@ -97,6 +97,25 @@ namespace MobileGL::MG_ConfigLoader {
: MG_Config::QuirkOverride::ForceOff;
}
// Multi-draw mode is a named-value preference: unset keeps Auto (best supported tier),
// a recognized name selects that tier as the ceiling, anything else warns and keeps Auto.
inline MG_Config::MultiDrawMode QueryEnvMultiDrawMode(const String& key) {
auto it = acceptedEnvVariablesMap->find(key);
if (it == acceptedEnvVariablesMap->end()) {
return MG_Config::MultiDrawMode::Auto;
}
String lowered = it->second;
std::transform(lowered.begin(), lowered.end(), lowered.begin(),
[](unsigned char c) { return static_cast<char>(std::tolower(c)); });
if (lowered == "ext") return MG_Config::MultiDrawMode::Ext;
if (lowered == "indirect") return MG_Config::MultiDrawMode::Indirect;
if (lowered == "unroll") return MG_Config::MultiDrawMode::Unroll;
if (lowered.empty() || lowered == "auto") return MG_Config::MultiDrawMode::Auto;
MGLOG_W("Config: Ignoring invalid env variable %s='%s'; expected ext|indirect|unroll|auto, using auto",
key.c_str(), it->second.c_str());
return MG_Config::MultiDrawMode::Auto;
}
inline Uint32 QueryEnvUint32(const String& key, Uint32 defaultValue, Uint32 minValue, Uint32 maxValue) {
auto it = acceptedEnvVariablesMap->find(key);
if (it == acceptedEnvVariablesMap->end()) {
@@ -138,6 +157,7 @@ namespace MobileGL::MG_ConfigLoader {
features.MagmaDisableBlendedDepthWriteQuirk =
QueryEnvQuirkOverride("MOBILEGL_MAGMA_DISABLE_BLENDED_DEPTH_WRITE");
features.DisableRobustBufferAccess = QueryEnvFlag("MOBILEGL_DISABLE_ROBUST_BUFFER_ACCESS");
features.MagmaMultiDrawMode = QueryEnvMultiDrawMode("MOBILEGL_MAGMA_MULTIDRAW_MODE");
}
inline void InitBackendType() {