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[Fix] (DirectGLES): request the point-size extension a tessellation or geometry stage's ESSL needs

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swung0x48
2026-08-27 15:06:01 -04:00
parent 62695ee3c2
commit e42e7d00f5
5 changed files with 158 additions and 6 deletions
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MobileGL/MG_Backend/DirectGLES/Managers.cpp
+57 -6
View File
@@ -6846,10 +6846,21 @@ namespace MobileGL::MG_Backend::DirectGLES {
const String outMembers =
ExtractPerVertexBlockMembers(tessEvalStageEssl, /*input=*/true).value_or(String());
const String source = BuildPassthroughTessControlEssl(ResolveBackendEsslVersion(), patchVertices,
inMembers, outMembers,
m_passthroughTessControlOuterLevel,
m_passthroughTessControlInnerLevel);
String source = BuildPassthroughTessControlEssl(ResolveBackendEsslVersion(), patchVertices,
inMembers, outMembers,
m_passthroughTessControlOuterLevel,
m_passthroughTessControlInnerLevel);
// The mirrored member lists can carry gl_PointSize - the neighbour stage declared it,
// so matching it is the whole point - and a redeclaration is exactly as illegal as a
// reference in ESSL without the extension. Same directive, same never-speculative
// rule as the per-stage loop; a driver with neither spelling gets nothing added and
// fails below with its own message, which is the honest outcome for a shape it
// cannot express.
const char* passthroughPointSizeExtension =
source.find("gl_PointSize") != String::npos
? PointSizeExtensionName(g_GLESCapabilities.TessellationPointSizeSupport, /*tessellation=*/true)
: nullptr;
source = RequestPointSizeExtension(Move(source), passthroughPointSizeExtension);
const GLuint backendShaderId = g_GLESFuncs.glCreateShader(GL_TESS_CONTROL_SHADER);
if (backendShaderId == 0) {
@@ -7373,6 +7384,40 @@ namespace MobileGL::MG_Backend::DirectGLES {
source.find("gl_ViewportIndex") != String::npos;
source = RequestViewportArrayExtension(std::move(source), needsViewportArrayExtension);
// The fourth header-level rewrite, and the same shape as the third: ESSL has no
// gl_PointSize in a tessellation or geometry stage at ANY version - 320 makes the
// stages core and still leaves the built-in behind EXT/OES_..._point_size - while
// SPIRV-Cross prints it bare. Without the directive the stage fails to compile
// with "`gl_PointSize' undeclared", which takes the whole program to program 0:
// the draw renders nothing AND glBeginTransformFeedback is rejected, so a capture
// of anything at all off that program silently comes back empty. The token probe
// keeps the line off every other program and PointSizeExtensionName returns
// nullptr - i.e. nothing is emitted - on a driver advertising neither spelling.
if (source.find("gl_PointSize") != String::npos) {
const Bool tessellationStage = glShaderType == GL_TESS_CONTROL_SHADER ||
glShaderType == GL_TESS_EVALUATION_SHADER;
if (tessellationStage || glShaderType == GL_GEOMETRY_SHADER) {
const auto tier = tessellationStage ? g_GLESCapabilities.TessellationPointSizeSupport
: g_GLESCapabilities.GeometryPointSizeSupport;
const char* pointSizeExtension = PointSizeExtensionName(tier, tessellationStage);
if (pointSizeExtension == nullptr) {
// Latched, and an ERROR rather than a warning: what follows is a
// driver compile failure whose text names a built-in the application
// never mis-spelled, and the reason is a missing driver capability
// rather than anything in the shader. Saying so here is the whole
// difference between a legible skip and an unexplained black draw.
MGLOG_E_ONCE("This driver advertises neither the EXT nor the OES %s_point_size "
"extension, so its ESSL has no gl_PointSize in a %s stage; program %u "
"will fail to compile. Point size from a non-vertex stage is not "
"available on this device.",
tessellationStage ? "tessellation" : "geometry",
tessellationStage ? "tessellation" : "geometry",
stateProgramObject->GetExternalIndex());
}
source = RequestPointSizeExtension(std::move(source), pointSizeExtension);
}
}
source = RebindImageUniformsToFrontendUnits(std::move(source), stateProgramObject);
// The completion half of the format bake, for the formats SPIRV-Cross throws on
// rather than prints (r8ui and the rest of its desktop-only set). Empty for every
@@ -7495,11 +7540,17 @@ namespace MobileGL::MG_Backend::DirectGLES {
// were being rejected outright, and the lane could not say why it was
// rendering an empty translucent layer. A shader the driver refuses is
// never noise, and one line per refused shader is bounded by program count.
//
// The SOURCE goes with it, the way the synthesized pass-through control
// stage's failure already prints its own: the driver log names a line and a
// column in text that exists nowhere but here, and without it the only way
// to read "`gl_PointSize' undeclared" is to rebuild the whole library at
// DEBUG. Still one line per refused shader.
MGLOG_E("Shader compilation failed. State program ID: %u, stage: %s, backend shader ID: "
"%u, driver log: %s",
"%u, driver log: %s\nSource:\n%s",
stateProgramObject->GetExternalIndex(),
MG_Util::ConvertGLEnumToString(glShaderType).c_str(), backendShaderId,
log.data());
log.data(), source.c_str());
m_backendProgramUsable = false;
// Nothing will ever attach this one, so nothing else can free it.
g_GLESFuncs.glDeleteShader(backendShaderId);
MobileGL/MG_Backend/DirectGLES/Utils.cpp
+41
View File
@@ -713,6 +713,47 @@ namespace MobileGL::MG_Backend::DirectGLES {
return glslCode;
}
const char* PointSizeExtensionName(MG_External::GLESCapabilities::PointSizeTier tier, Bool tessellation) {
using Tier = MG_External::GLESCapabilities::PointSizeTier;
switch (tier) {
case Tier::ExtensionEXT:
return tessellation ? "GL_EXT_tessellation_point_size" : "GL_EXT_geometry_point_size";
case Tier::ExtensionOES:
return tessellation ? "GL_OES_tessellation_point_size" : "GL_OES_geometry_point_size";
default:
return nullptr;
}
}
String RequestPointSizeExtension(String glslCode, const char* extensionName) {
#ifdef TRACY_ENABLE
ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
#endif
// The gl_ViewportIndex story, one built-in over: ESSL 320 makes the tessellation and
// geometry STAGES core but leaves gl_PointSize out of their gl_PerVertex entirely,
// and SPIRV-Cross - which only ever sees a SPIR-V BuiltIn PointSize decoration -
// prints the identifier with no directive behind it. Same hard rule as the two
// neighbours: never emitted speculatively, because `#extension` on a name the driver
// does not advertise is a compile error of its own.
if (extensionName == nullptr || glslCode.find(extensionName) != String::npos) {
return glslCode;
}
const String directive = String("#extension ") + extensionName + " : require\n";
// Right after the #version line, the one position that must stay first;
// ForceSupporterOutput's scan for the LAST #extension directive still finds
// whichever one that ends up being.
const SizeT versionPos = glslCode.find("#version");
if (versionPos == String::npos) {
return directive + glslCode;
}
const SizeT lineEnd = glslCode.find('\n', versionPos);
if (lineEnd == String::npos) {
return glslCode + "\n" + directive;
}
glslCode.insert(lineEnd + 1, directive);
return glslCode;
}
String BakeImageFormatQualifiers(String glslCode,
const UnorderedMap<String, String>& esslFormatByUniformName) {
#ifdef TRACY_ENABLE
MobileGL/MG_Backend/DirectGLES/Utils.h
+16
View File
@@ -273,6 +273,22 @@ namespace MobileGL::MG_Backend::DirectGLES {
// error, so this is never emitted speculatively. A no-op when not needed or already
// present.
String RequestViewportArrayExtension(String glslCode, Bool needed);
// Adds `#extension <extensionName> : require` when a TESSELLATION or GEOMETRY stage's
// emitted ESSL names gl_PointSize. Desktop GL has that built-in in gl_PerVertex for every
// vertex-processing stage; ESSL does NOT have it in those two at any version - not even
// 320, where the stages themselves are core - until EXT/OES_tessellation_point_size resp.
// EXT/OES_geometry_point_size is requested. SPIRV-Cross prints the identifier bare and
// asks for nothing, exactly as it does for gl_ViewportIndex, so without this the stage
// fails to compile with "`gl_PointSize' undeclared" and the WHOLE program is replaced by
// program 0 - the draw renders nothing and any transform-feedback capture it was carrying
// is rejected outright. `extensionName` is the caller's answer, nullptr when the driver
// advertises neither spelling, because requesting an unadvertised extension is itself a
// compile error. A no-op when nullptr or already present.
String RequestPointSizeExtension(String glslCode, const char* extensionName);
// The extension name RequestPointSizeExtension should be given for `tier`, or nullptr for
// PointSizeTier::None. `tessellation` picks the tessellation spellings over the geometry
// ones; the two extensions are separate and neither implies the other.
const char* PointSizeExtensionName(MG_External::GLESCapabilities::PointSizeTier tier, Bool tessellation);
// Writes a format layout qualifier into the image declarations named in
// `esslFormatByUniformName` that still have none. The completion half of the image-format
// bake, and ONLY that: the SPIR-V pass (BakeImageFormatsPass) is what normally puts the