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[Feat] (MG_Config, MG_Util): a tier knob and two capability flags for Espryt multi-draw

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MOBILEGL_ESPRYT_MULTIDRAW_MODE=ext|multiindirect|indirect|basevertex|
drawelements|compute|auto names the DirectGLES emulation tier for
glMultiDrawElements(BaseVertex). Same contract as the Magma knob: a
preference, not a demand, clamped at resolution time to what the driver
actually has, and invalid values keep auto. Nothing reads it yet.

The two capability flags the ladder selects on are new because neither
existed in the shape the choice needs. SupportsDrawElementsBaseVertex is
the weaker sibling of SupportsMultiDrawElementsBaseVertex - ES 3.2 core
or EXT/OES_draw_elements_base_vertex, with no GL_EXT_multi_draw_arrays
requirement - and it decides whether a batch can replay its sub-draws
with their own base vertices or has to fold them into rewritten indices.
SupportsComputeShader is ES 3.1 core plus the dispatch, barrier and
shader-object entry points. Both keep the house rule the multi-draw
flags already follow: the extension/version check is what proves
support, the resolved pointer only confirms it, because
eglGetProcAddress may hand back a live-looking stub for a function the
context does not implement.
This commit is contained in:
BZLZHH
2026-08-07 08:15:31 -04:00
parent ebc5bff9b1
commit 23b880c8be
4 changed files with 69 additions and 0 deletions
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MobileGL/ConfigLoader.cpp
+23
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@@ -116,6 +116,28 @@ namespace MobileGL::MG_ConfigLoader {
return MG_Config::MultiDrawMode::Auto;
}
// Same contract as QueryEnvMultiDrawMode, over the DirectGLES tier names.
inline MG_Config::GLESMultiDrawMode QueryEnvGLESMultiDrawMode(const String& key) {
auto it = acceptedEnvVariablesMap->find(key);
if (it == acceptedEnvVariablesMap->end()) {
return MG_Config::GLESMultiDrawMode::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::GLESMultiDrawMode::Ext;
if (lowered == "multiindirect") return MG_Config::GLESMultiDrawMode::MultiIndirect;
if (lowered == "indirect") return MG_Config::GLESMultiDrawMode::Indirect;
if (lowered == "basevertex") return MG_Config::GLESMultiDrawMode::BaseVertex;
if (lowered == "drawelements") return MG_Config::GLESMultiDrawMode::DrawElements;
if (lowered == "compute") return MG_Config::GLESMultiDrawMode::Compute;
if (lowered.empty() || lowered == "auto") return MG_Config::GLESMultiDrawMode::Auto;
MGLOG_W("Config: Ignoring invalid env variable %s='%s'; expected "
"ext|multiindirect|indirect|basevertex|drawelements|compute|auto, using auto",
key.c_str(), it->second.c_str());
return MG_Config::GLESMultiDrawMode::Auto;
}
inline Uint32 QueryEnvUint32(const String& key, Uint32 defaultValue, Uint32 minValue, Uint32 maxValue) {
auto it = acceptedEnvVariablesMap->find(key);
if (it == acceptedEnvVariablesMap->end()) {
@@ -158,6 +180,7 @@ namespace MobileGL::MG_ConfigLoader {
QueryEnvQuirkOverride("MOBILEGL_MAGMA_DISABLE_BLENDED_DEPTH_WRITE");
features.DisableRobustBufferAccess = QueryEnvFlag("MOBILEGL_DISABLE_ROBUST_BUFFER_ACCESS");
features.MagmaMultiDrawMode = QueryEnvMultiDrawMode("MOBILEGL_MAGMA_MULTIDRAW_MODE");
features.EsprytMultiDrawMode = QueryEnvGLESMultiDrawMode("MOBILEGL_ESPRYT_MULTIDRAW_MODE");
}
inline void InitBackendType() {