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MobileGL/MobileGL/MG_Impl/GLImpl/Program/ProgramInterface.cpp
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// MobileGL - MobileGL/MG_Impl/GLImpl/Program/ProgramInterface.cpp
// Copyright (c) 2025-2026 MobileGL-Dev
// Licensed under the GNU Lesser General Public License v3.0:
// https://www.gnu.org/licenses/gpl-3.0.txt
// https://www.gnu.org/licenses/lgpl-3.0.txt
// SPDX-License-Identifier: LGPL-3.0-only
// End of Source File Header
#include "ProgramInterface.h"
#include <MG_State/GLState/ProgramState/ProgramObject.h>
#include <MG_Util/ShaderTranspiler/Types.h>
#include <cstring>
namespace MobileGL::MG_Impl::GLImpl::ProgramInterface {
namespace {
// glslang folds atomic counters into synthesized blocks named
// "<getAtomicCounterBlockName()>_<binding>" (ParseContextBase.cpp), one per GL
// atomic-counter binding point. That block IS the GL_ATOMIC_COUNTER_BUFFER resource
// and its trailing number IS GL_BUFFER_BINDING; its members stay GL_UNIFORMs.
constexpr const char* kAtomicCounterBlockPrefix = "gl_AtomicCounterBlock";
enum class BlockKind {
Uniform, // a real GL uniform block
GlobalUbo, // the synthesized MGL_GLOBAL_UBO: GL sees its members as default-block
AtomicCounter, // gl_AtomicCounterBlock_<binding>
Storage, // a shader storage block
};
// One row of any interface. Fields a given interface does not have keep the
// spec-mandated "not applicable" value, so a prop read never has to special-case
// the interface a second time.
struct Resource {
String name;
GLenum type = GL_NONE;
GLint arraySize = 1;
GLint location = -1;
GLint locationIndex = -1;
GLint blockIndex = -1;
GLint offset = -1;
GLint arrayStride = -1;
GLint matrixStride = -1;
GLint isRowMajor = 0;
GLint atomicCounterBufferIndex = -1;
GLint topLevelArraySize = 0;
GLint topLevelArrayStride = 0;
GLint bufferBinding = 0;
GLint bufferDataSize = 0;
GLint isPerPatch = 0;
GLint xfbBufferIndex = 0;
Uint32 stages = 0; // EShLanguageMask
Vector<GLuint> activeVariables;
};
using ResourceList = Vector<Resource>;
struct Model {
ResourceList uniforms;
ResourceList uniformBlocks;
ResourceList atomicCounterBuffers;
ResourceList bufferVariables;
ResourceList storageBlocks;
ResourceList programInputs;
ResourceList programOutputs;
ResourceList xfbVaryings;
Bool valid = false;
};
const ResourceList& EmptyList() {
static const ResourceList empty;
return empty;
}
// ---- name spelling (cluster 6) -------------------------------------------------
Bool EndsWithZeroSubscript(const String& name) {
return name.length() >= 3 && name.compare(name.length() - 3, 3, "[0]") == 0;
}
// The enumerated spelling of an array resource is "name[0]". glslang already applies
// that to uniforms and buffer variables (EShReflectionBasicArraySuffix), but never to
// stage inputs/outputs, so those get it here.
String WithArraySuffix(const String& name, const glslang::TType* type) {
if (type == nullptr || !type->isArray() || EndsWithZeroSubscript(name)) return name;
return name + "[0]";
}
// GL_ARRAY_SIZE: element count for a sized array, 0 for a runtime-sized one
// (a shader storage block's unsized trailing member), 1 for a non-array.
GLint ArraySizeOf(const glslang::TType* type, GLint reflectedSize) {
if (type != nullptr && type->isArray()) {
if (!type->isSizedArray()) return 0;
return type->getOuterArraySize();
}
return reflectedSize < 1 ? 1 : reflectedSize;
}
// Two spellings name the same resource when they are equal, or differ only by the
// "[0]" the enumeration appends to an array.
Bool NamesMatch(const String& resourceName, const String& query) {
if (resourceName == query) return true;
if (EndsWithZeroSubscript(resourceName) &&
resourceName.compare(0, resourceName.length() - 3, query) == 0) {
return true;
}
return EndsWithZeroSubscript(query) && query.compare(0, query.length() - 3, resourceName) == 0;
}
// Splits "base[k]" into ("base", k). GL 4.6 §7.3.1.1 requires the subscript to be a
// decimal integer with no white space and no leading zeros, which is exactly what
// separates array-names' "a[1]" (resolves) from "a[01]", "a[0 + 0]" and "a[ 0]" (do
// not). Returns false when there is no trailing subscript at all; sets `malformed`
// when there is one but it is not a strict decimal.
Bool SplitTrailingSubscript(const String& name, String& outBase, Uint& outElement, Bool& outMalformed) {
outMalformed = false;
if (name.empty() || name.back() != ']') return false;
const SizeT bracket = name.rfind('[');
if (bracket == String::npos) return false;
const SizeT first = bracket + 1;
const SizeT last = name.length() - 1; // one past the digits
if (first >= last) {
outMalformed = true;
return false;
}
// No leading zeros: "0" is the only spelling that may start with '0'.
if (name[first] == '0' && last - first > 1) {
outMalformed = true;
return false;
}
Uint element = 0;
for (SizeT i = first; i < last; ++i) {
if (name[i] < '0' || name[i] > '9') {
outMalformed = true;
return false;
}
element = element * 10 + static_cast<Uint>(name[i] - '0');
if (element > 0x0FFFFFFFu) {
outMalformed = true;
return false;
}
}
outBase = name.substr(0, bracket);
outElement = element;
return true;
}
// ---- block classification ------------------------------------------------------
Bool IsAtomicCounterBlockName(const String& name) {
return name.compare(0, std::strlen(kAtomicCounterBlockPrefix), kAtomicCounterBlockPrefix) == 0;
}
// "gl_AtomicCounterBlock_5" -> 5. The suffix is the GL binding the counters were
// declared with, which glslang does NOT keep in the block's own layout qualifier
// (that one is remapped to a plain buffer binding).
GLint AtomicCounterBlockBinding(const String& name) {
const SizeT underscore = name.rfind('_');
if (underscore == String::npos || underscore + 1 >= name.length()) return 0;
GLint binding = 0;
for (SizeT i = underscore + 1; i < name.length(); ++i) {
if (name[i] < '0' || name[i] > '9') return 0;
binding = binding * 10 + (name[i] - '0');
}
return binding;
}
// Element index of an arrayed block instance ("TrickyBuffer[1]" -> 1).
GLint BlockArrayElement(const String& name) {
String base;
Uint element = 0;
Bool malformed = false;
if (!SplitTrailingSubscript(name, base, element, malformed)) return 0;
return static_cast<GLint>(element);
}
BlockKind ClassifyBlock(const glslang::TObjectReflection& block) {
if (std::strstr(block.name.c_str(), MG_Util::ShaderTranspiler::GLOBAL_UBO_NAME) != nullptr) {
return BlockKind::GlobalUbo;
}
if (IsAtomicCounterBlockName(block.name)) return BlockKind::AtomicCounter;
const glslang::TType* type = block.getType();
if (type != nullptr && type->getQualifier().storage == glslang::EvqBuffer) return BlockKind::Storage;
return BlockKind::Uniform;
}
// std140/std430 column stride, the same vec4-rounded rule ProgramObject applies to
// uniform matrices. 0 for a non-matrix.
GLint MatrixStrideOf(const glslang::TType* type) {
if (type == nullptr || !type->isMatrix()) return 0;
const bool rowMajor = type->getQualifier().layoutMatrix == glslang::ElmRowMajor;
const int strideVectorComponents = rowMajor ? type->getMatrixCols() : type->getMatrixRows();
constexpr int scalarSize = 4;
const int vectorAlignment = (strideVectorComponents <= 1) ? scalarSize
: (strideVectorComponents == 2) ? 2 * scalarSize
: 4 * scalarSize;
return (vectorAlignment + 15) & ~15;
}
GLint IsRowMajorOf(const glslang::TType* type) {
if (type == nullptr || !type->isMatrix()) return 0;
return type->getQualifier().layoutMatrix == glslang::ElmRowMajor ? 1 : 0;
}
GLint MappedLocation(Int rawLocation) {
// glslang parks "no location" at layoutLocationEnd; GL spells it -1.
if (rawLocation < 0 || rawLocation >= static_cast<Int>(glslang::TQualifier::layoutLocationEnd)) return -1;
return rawLocation;
}
// ---- model construction --------------------------------------------------------
// GL_REFERENCED_BY_*_SHADER for an ARRAYED block instance, refined per element.
//
// glslang records a block reference by walking up to the base symbol and calling
// addBlockName with the whole ARRAY type, which ORs the referencing stage into every
// element at once - it has not resolved the subscript yet at that point. So reading
// "e[0].b" marks both TrickyBlock[0] and TrickyBlock[1] as referenced by the fragment
// stage (KHR-GL43.program_interface_query.uniform-block-types).
//
// The MEMBER masks are exact: EShReflectionAllBlockVariables enumerates every member of
// every element with the stage mask suppressed, and only the dereference chain actually
// walked turns a bit on - and that chain carries the subscript. So the union of a block
// instance's members is the reference set of that instance.
//
// Applied ONLY to arrayed instances, because for a scalar block glslang is already exact.
// Note the union is used even when it is empty: an array element nobody dereferenced has
// no member bits and is genuinely referenced by nobody, which is the whole point - falling
// back to the block's own mask there would restore the over-approximation.
Vector<Uint32> BuildBlockStagesFromMembers(const glslang::TProgram& reflection, Int blockCount) {
auto& mutableReflection = const_cast<glslang::TProgram&>(reflection);
Vector<Uint32> stagesByBlock(static_cast<SizeT>(blockCount < 0 ? 0 : blockCount), 0u);
const Int uniformCount = mutableReflection.getNumUniformVariables();
for (Int index = 0; index < uniformCount; ++index) {
const auto& uniform = mutableReflection.getUniform(index);
const Int owner = uniform.index;
if (owner < 0 || owner >= blockCount) continue;
stagesByBlock[static_cast<SizeT>(owner)] |= static_cast<Uint32>(uniform.stages);
}
return stagesByBlock;
}
// UNIFORM blocks only, and that scope is load-bearing rather than cautious. The member
// names glslang produces for a uniform block array carry the subscript
// ("TrickyBlock[0].b", via EShReflectionStrictArraySuffix), so each element's members are
// distinct entries and the bits land on the right one. A SHADER STORAGE block array does
// NOT get that treatment - its buffer variables reflect under one subscript-free spelling
// shared by every element - so a union over them credits element 0 and starves the rest.
// KHR-GL43.program_interface_query.ssb-types is the case that says so: it reads ss[0] and
// ss[1] and requires both to report the fragment stage, which only glslang's own
// (deliberately over-approximating) block mask gets right. Storage and atomic-counter
// blocks therefore keep that mask untouched.
Uint32 UniformBlockStages(const glslang::TObjectReflection& block, const Vector<Uint32>& stagesFromMembers,
Int tIndex) {
String arrayBase;
Uint element = 0;
Bool malformed = false;
if (!SplitTrailingSubscript(block.name, arrayBase, element, malformed) || malformed) {
return static_cast<Uint32>(block.stages);
}
if (tIndex < 0 || tIndex >= static_cast<Int>(stagesFromMembers.size())) {
return static_cast<Uint32>(block.stages);
}
return stagesFromMembers[static_cast<SizeT>(tIndex)];
}
void BuildBlocks(ProgramObject& program, const glslang::TProgram& reflection, Model& model,
Vector<BlockKind>& blockKind, Vector<Int>& blockInterfaceIndex) {
const Int blockCount = const_cast<glslang::TProgram&>(reflection).getNumUniformBlocks();
blockKind.assign(blockCount, BlockKind::Uniform);
blockInterfaceIndex.assign(blockCount, -1);
const Vector<Uint32> stagesFromMembers = BuildBlockStagesFromMembers(reflection, blockCount);
for (Int tIndex = 0; tIndex < blockCount; ++tIndex) {
const auto& block = const_cast<glslang::TProgram&>(reflection).getUniformBlock(tIndex);
const BlockKind kind = ClassifyBlock(block);
blockKind[tIndex] = kind;
if (kind == BlockKind::AtomicCounter) {
Resource resource;
// GL_ATOMIC_COUNTER_BUFFER resources have no name (and GetProgramResource
// Index/Name reject the interface outright, which is why this stays empty).
resource.bufferBinding = AtomicCounterBlockBinding(block.name);
resource.bufferDataSize = block.size;
resource.stages = static_cast<Uint32>(block.stages);
blockInterfaceIndex[tIndex] = static_cast<Int>(model.atomicCounterBuffers.size());
model.atomicCounterBuffers.push_back(Move(resource));
} else if (kind == BlockKind::Storage) {
Resource resource;
resource.name = block.name;
// glslang reports the DECLARED binding for every instance of an arrayed
// block; GL gives element k the binding base + k. That is only the initial
// value: GL_BUFFER_BINDING must report the CURRENT binding, so a later
// glShaderStorageBlockBinding wins over the declaration (GL 4.6 §7.6.2 -
// exactly the same rule GL_UNIFORM_BLOCK follows through
// GetUniformBlockBinding below).
const GLint declared = block.getBinding();
resource.bufferBinding = declared < 0 ? 0 : declared + BlockArrayElement(block.name);
const Int rebound = program.GetShaderStorageBlockBindingOverride(block.name);
if (rebound >= 0) resource.bufferBinding = static_cast<GLint>(rebound);
resource.bufferDataSize = block.size;
resource.stages = static_cast<Uint32>(block.stages);
blockInterfaceIndex[tIndex] = static_cast<Int>(model.storageBlocks.size());
model.storageBlocks.push_back(Move(resource));
}
}
// GL_UNIFORM_BLOCK keeps the index space glUniformBlockBinding and
// glGetActiveUniformBlockiv already use, so an index handed out here is usable
// with them (which is exactly what the CTS does).
const Int glBlockCount = program.GetActiveUniformBlocksCount();
for (Int glIndex = 0; glIndex < glBlockCount; ++glIndex) {
Resource resource;
resource.name = program.GetUniformBlockName(glIndex);
resource.bufferBinding = static_cast<GLint>(program.GetUniformBlockBinding(glIndex));
resource.bufferDataSize = static_cast<GLint>(program.GetUBOSizeAt(glIndex));
const Int tIndex = program.TProgramBlockIndex(static_cast<Uint>(glIndex));
if (tIndex >= 0 && tIndex < blockCount) {
resource.stages = UniformBlockStages(const_cast<glslang::TProgram&>(reflection).getUniformBlock(tIndex),
stagesFromMembers, tIndex);
}
model.uniformBlocks.push_back(Move(resource));
}
}
void BuildUniformsAndBufferVariables(ProgramObject& program, const glslang::TProgram& reflection, Model& model,
const Vector<BlockKind>& blockKind,
const Vector<Int>& blockInterfaceIndex) {
const Uint uniformCount = program.GetUniformCount();
for (Uint glIndex = 0; glIndex < uniformCount; ++glIndex) {
const Int tIndex = program.TProgramUniformIndex(glIndex);
const auto& refl = const_cast<glslang::TProgram&>(reflection).getUniform(tIndex);
const glslang::TType* type = refl.getType();
const Int owner = refl.index;
const BlockKind kind = (owner >= 0 && owner < static_cast<Int>(blockKind.size()))
? blockKind[owner]
: BlockKind::GlobalUbo;
Resource resource;
resource.name = refl.name;
resource.type = static_cast<GLenum>(refl.glDefineType);
resource.arraySize = ArraySizeOf(type, refl.size);
resource.stages = static_cast<Uint32>(refl.stages);
if (kind == BlockKind::Storage) {
resource.blockIndex = blockInterfaceIndex[owner];
resource.offset = refl.offset;
resource.arrayStride = refl.arrayStride;
resource.matrixStride = MatrixStrideOf(type);
resource.isRowMajor = IsRowMajorOf(type);
// GL requires 1 for a member that is not inside a top-level array (and for
// the top-level array itself); glslang leaves 0/-1 there.
resource.topLevelArraySize = refl.topLevelArraySize > 0 ? refl.topLevelArraySize : 1;
resource.topLevelArrayStride = refl.topLevelArrayStride;
model.bufferVariables.push_back(Move(resource));
continue;
}
if (kind == BlockKind::AtomicCounter) {
// An atomic counter is a default-block uniform with no location and no
// owning uniform block; what it does have is a buffer to point at.
resource.type = GL_UNSIGNED_INT_ATOMIC_COUNTER;
resource.blockIndex = -1;
resource.offset = refl.offset;
resource.arrayStride = refl.arrayStride;
resource.matrixStride = 0;
resource.atomicCounterBufferIndex = blockInterfaceIndex[owner];
resource.location = -1;
} else {
resource.blockIndex = program.GetActiveUniformBlockIndex(glIndex);
resource.offset = program.GetActiveUniformOffset(glIndex);
resource.arrayStride = program.GetActiveUniformArrayStride(glIndex);
resource.matrixStride = program.GetActiveUniformMatrixStride(glIndex);
resource.isRowMajor = program.GetActiveUniformIsRowMajor(glIndex);
// A member of a named uniform block has no location, whatever the
// frontend's own location table says (it hands one out to every uniform
// so glUniform* can address block members through the global UBO).
resource.location =
resource.blockIndex >= 0 ? -1 : program.GetUniformLocation(refl.name);
}
model.uniforms.push_back(Move(resource));
}
// GL_ACTIVE_VARIABLES, both directions.
for (SizeT i = 0; i < model.uniforms.size(); ++i) {
const Resource& uniform = model.uniforms[i];
if (uniform.atomicCounterBufferIndex >= 0 &&
uniform.atomicCounterBufferIndex < static_cast<GLint>(model.atomicCounterBuffers.size())) {
model.atomicCounterBuffers[uniform.atomicCounterBufferIndex].activeVariables.push_back(
static_cast<GLuint>(i));
}
}
for (SizeT blockIndex = 0; blockIndex < model.uniformBlocks.size(); ++blockIndex) {
// Members of an arrayed block are reflected once, against instance [0].
const Int owner = static_cast<Int>(program.GetUniformBlockMemberOwnerIndex(static_cast<Uint>(blockIndex)));
for (SizeT i = 0; i < model.uniforms.size(); ++i) {
if (model.uniforms[i].blockIndex == owner) {
model.uniformBlocks[blockIndex].activeVariables.push_back(static_cast<GLuint>(i));
}
}
}
for (SizeT blockIndex = 0; blockIndex < model.storageBlocks.size(); ++blockIndex) {
for (SizeT i = 0; i < model.bufferVariables.size(); ++i) {
if (model.bufferVariables[i].blockIndex == static_cast<GLint>(blockIndex)) {
model.storageBlocks[blockIndex].activeVariables.push_back(static_cast<GLuint>(i));
}
}
}
}
// A built-in interface block that a shader redeclares with fewer members keeps the
// omitted ones in its type when the redeclaration is ANONYMOUS - glslang hides them
// (basic type void) instead of erasing them, because the original shared declaration
// has to stay usable. Only the instance-named form erases. So a separable vertex
// program that redeclares `out gl_PerVertex { vec4 gl_Position; }` still carries
// gl_PointSize and gl_ClipDistance through the block-unwrapping reflection, and they
// are not part of its output interface.
Bool IsHiddenBlockMember(const glslang::TType* type) {
return type != nullptr && type->getBasicType() == glslang::EbtVoid;
}
void BuildStageIO(ProgramObject& program, const glslang::TProgram& reflection, Model& model) {
auto& mutableReflection = const_cast<glslang::TProgram&>(reflection);
const Int inputCount = mutableReflection.getNumPipeInputs();
for (Int index = 0; index < inputCount; ++index) {
const auto& refl = mutableReflection.getPipeInput(index);
const glslang::TType* type = refl.getType();
if (IsHiddenBlockMember(type)) continue;
Resource resource;
// The Vulkan-semantics parse reflects the vertex builtins under their SPIR-V
// names; GL enumerates the GL spellings.
const String& glName = ProgramObject::NormalizeBuiltinPipeInputName(refl.name);
resource.name = WithArraySuffix(glName, type);
resource.type = static_cast<GLenum>(refl.glDefineType);
resource.arraySize = ArraySizeOf(type, refl.size);
resource.location = program.GetAttributeLocation(refl.name);
if (resource.location < 0) resource.location = MappedLocation(static_cast<Int>(refl.layoutLocation()));
resource.isPerPatch = (type != nullptr && type->getQualifier().patch) ? 1 : 0;
resource.stages = static_cast<Uint32>(refl.stages);
model.programInputs.push_back(Move(resource));
}
// A color number, and therefore a color INDEX, exists only for a fragment stage's
// outputs. The output interface belongs to the program's last stage, so for a
// separable tessellation/geometry/vertex program these are varyings: asking the
// frag-data maps about them can still answer a location (a tess-control output
// carries its own layout(location=N)), and a location then manufactures a color
// index of 0 where GL requires -1
// (KHR-GL43.program_interface_query.separate-programs-tess-control).
const Bool lastStageIsFragment = mutableReflection.getIntermediate(EShLangFragment) != nullptr;
const Int outputCount = mutableReflection.getNumPipeOutputs();
for (Int index = 0; index < outputCount; ++index) {
const auto& refl = mutableReflection.getPipeOutput(index);
const glslang::TType* type = refl.getType();
if (IsHiddenBlockMember(type)) continue;
Resource resource;
resource.name = WithArraySuffix(refl.name, type);
resource.type = static_cast<GLenum>(refl.glDefineType);
resource.arraySize = ArraySizeOf(type, refl.size);
resource.location = MappedLocation(program.GetFragmentDataLocation(refl.name.c_str()));
if (resource.location < 0 || !lastStageIsFragment) {
// A built-in output (gl_FragDepth, gl_SampleMask) has no location, and a
// non-fragment stage's outputs have no color number at all - either way there
// is no color index.
resource.locationIndex = -1;
} else {
resource.locationIndex = program.GetFragmentDataIndex(refl.name.c_str());
// glBindFragDataLocationIndexed wins; otherwise the shader's
// layout(index = N), which the frag-data maps never saw.
if (resource.locationIndex == 0 && type != nullptr && type->getQualifier().hasIndex()) {
resource.locationIndex = static_cast<GLint>(type->getQualifier().layoutIndex);
}
}
resource.isPerPatch = (type != nullptr && type->getQualifier().patch) ? 1 : 0;
resource.stages = static_cast<Uint32>(refl.stages);
model.programOutputs.push_back(Move(resource));
}
}
void BuildXfb(ProgramObject& program, Model& model) {
const auto& requested = program.GetTransformFeedbackInterfaceNames();
const auto& captured = program.GetTransformFeedbackVaryings();
for (const String& name : requested) {
Resource resource;
resource.name = name;
// ARB_transform_feedback3's layout controls are enumerated as resources of
// type NONE: gl_NextBuffer with array size 0, gl_SkipComponentsN with N.
if (name == "gl_NextBuffer") {
resource.type = GL_NONE;
resource.arraySize = 0;
} else if (name.size() == 18 && name.compare(0, 17, "gl_SkipComponents") == 0 && name[17] >= '1' &&
name[17] <= '4') {
resource.type = GL_NONE;
resource.arraySize = name[17] - '0';
} else {
resource.type = GL_NONE;
resource.arraySize = 1;
for (const auto& varying : captured) {
if (varying.name != name) continue;
resource.type = varying.type;
resource.arraySize = varying.size < 1 ? 1 : varying.size;
resource.offset = static_cast<GLint>(varying.offsetBytes);
resource.xfbBufferIndex = static_cast<GLint>(varying.bufferIndex);
break;
}
}
model.xfbVaryings.push_back(Move(resource));
}
}
Model BuildModel(ProgramObject& program) {
Model model;
if (!program.GetLinkStatus()) return model;
const glslang::TProgram* reflection = program.GetReflection();
if (reflection == nullptr) return model;
model.valid = true;
Vector<BlockKind> blockKind;
Vector<Int> blockInterfaceIndex;
BuildBlocks(program, *reflection, model, blockKind, blockInterfaceIndex);
BuildUniformsAndBufferVariables(program, *reflection, model, blockKind, blockInterfaceIndex);
BuildStageIO(program, *reflection, model);
BuildXfb(program, model);
return model;
}
const ResourceList& Select(const Model& model, GLenum programInterface) {
switch (programInterface) {
case GL_UNIFORM:
return model.uniforms;
case GL_UNIFORM_BLOCK:
return model.uniformBlocks;
case GL_ATOMIC_COUNTER_BUFFER:
return model.atomicCounterBuffers;
case GL_BUFFER_VARIABLE:
return model.bufferVariables;
case GL_SHADER_STORAGE_BLOCK:
return model.storageBlocks;
case GL_PROGRAM_INPUT:
return model.programInputs;
case GL_PROGRAM_OUTPUT:
return model.programOutputs;
case GL_TRANSFORM_FEEDBACK_VARYING:
return model.xfbVaryings;
default:
// The subroutine interfaces are accepted by the API but nothing can populate
// them: glslang refuses `subroutine` when generating SPIR-V, so a program
// using one never links. Zero active resources is the honest answer.
return EmptyList();
}
}
} // namespace
Bool IsInterfaceEnum(GLenum programInterface) {
switch (programInterface) {
case GL_UNIFORM:
case GL_UNIFORM_BLOCK:
case GL_PROGRAM_INPUT:
case GL_PROGRAM_OUTPUT:
case GL_BUFFER_VARIABLE:
case GL_SHADER_STORAGE_BLOCK:
case GL_ATOMIC_COUNTER_BUFFER:
case GL_TRANSFORM_FEEDBACK_VARYING:
case GL_TRANSFORM_FEEDBACK_BUFFER:
case GL_VERTEX_SUBROUTINE:
case GL_TESS_CONTROL_SUBROUTINE:
case GL_TESS_EVALUATION_SUBROUTINE:
case GL_GEOMETRY_SUBROUTINE:
case GL_FRAGMENT_SUBROUTINE:
case GL_COMPUTE_SUBROUTINE:
case GL_VERTEX_SUBROUTINE_UNIFORM:
case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
case GL_GEOMETRY_SUBROUTINE_UNIFORM:
case GL_FRAGMENT_SUBROUTINE_UNIFORM:
case GL_COMPUTE_SUBROUTINE_UNIFORM:
return true;
default:
return false;
}
}
Bool IsNamedInterface(GLenum programInterface) {
// GL 4.6 §7.3.1.2: the two buffer interfaces have no resource names, and asking for
// one is INVALID_ENUM (deliberately asymmetric with GetProgramInterfaceiv, which
// does count them).
return IsInterfaceEnum(programInterface) && programInterface != GL_ATOMIC_COUNTER_BUFFER &&
programInterface != GL_TRANSFORM_FEEDBACK_BUFFER;
}
Bool InterfaceHasLocations(GLenum programInterface) {
switch (programInterface) {
case GL_UNIFORM:
case GL_PROGRAM_INPUT:
case GL_PROGRAM_OUTPUT:
case GL_VERTEX_SUBROUTINE_UNIFORM:
case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
case GL_GEOMETRY_SUBROUTINE_UNIFORM:
case GL_FRAGMENT_SUBROUTINE_UNIFORM:
case GL_COMPUTE_SUBROUTINE_UNIFORM:
return true;
default:
return false;
}
}
Bool IsResourceProp(GLenum prop) {
switch (prop) {
case GL_NAME_LENGTH:
case GL_TYPE:
case GL_ARRAY_SIZE:
case GL_OFFSET:
case GL_BLOCK_INDEX:
case GL_ARRAY_STRIDE:
case GL_MATRIX_STRIDE:
case GL_IS_ROW_MAJOR:
case GL_ATOMIC_COUNTER_BUFFER_INDEX:
case GL_BUFFER_BINDING:
case GL_BUFFER_DATA_SIZE:
case GL_NUM_ACTIVE_VARIABLES:
case GL_ACTIVE_VARIABLES:
case GL_REFERENCED_BY_VERTEX_SHADER:
case GL_REFERENCED_BY_TESS_CONTROL_SHADER:
case GL_REFERENCED_BY_TESS_EVALUATION_SHADER:
case GL_REFERENCED_BY_GEOMETRY_SHADER:
case GL_REFERENCED_BY_FRAGMENT_SHADER:
case GL_REFERENCED_BY_COMPUTE_SHADER:
case GL_TOP_LEVEL_ARRAY_SIZE:
case GL_TOP_LEVEL_ARRAY_STRIDE:
case GL_LOCATION:
case GL_LOCATION_INDEX:
case GL_IS_PER_PATCH:
case GL_LOCATION_COMPONENT:
case GL_TRANSFORM_FEEDBACK_BUFFER_INDEX:
case GL_TRANSFORM_FEEDBACK_BUFFER_STRIDE:
case GL_NUM_COMPATIBLE_SUBROUTINES:
case GL_COMPATIBLE_SUBROUTINES:
return true;
default:
return false;
}
}
// GL 4.6 Table 7.2, transcribed row by row: which interfaces each property applies to.
// Too tight a table turns a currently-answered prop into a fresh INVALID_OPERATION, so
// the rows below are deliberately no narrower than the spec's.
Bool InterfaceSupportsProp(GLenum programInterface, GLenum prop) {
const Bool isSubroutine =
programInterface == GL_VERTEX_SUBROUTINE || programInterface == GL_TESS_CONTROL_SUBROUTINE ||
programInterface == GL_TESS_EVALUATION_SUBROUTINE || programInterface == GL_GEOMETRY_SUBROUTINE ||
programInterface == GL_FRAGMENT_SUBROUTINE || programInterface == GL_COMPUTE_SUBROUTINE;
const Bool isSubroutineUniform =
programInterface == GL_VERTEX_SUBROUTINE_UNIFORM ||
programInterface == GL_TESS_CONTROL_SUBROUTINE_UNIFORM ||
programInterface == GL_TESS_EVALUATION_SUBROUTINE_UNIFORM ||
programInterface == GL_GEOMETRY_SUBROUTINE_UNIFORM ||
programInterface == GL_FRAGMENT_SUBROUTINE_UNIFORM || programInterface == GL_COMPUTE_SUBROUTINE_UNIFORM;
switch (prop) {
case GL_NAME_LENGTH:
return programInterface != GL_ATOMIC_COUNTER_BUFFER && programInterface != GL_TRANSFORM_FEEDBACK_BUFFER;
case GL_TYPE:
case GL_ARRAY_SIZE:
return programInterface == GL_UNIFORM || programInterface == GL_PROGRAM_INPUT ||
programInterface == GL_PROGRAM_OUTPUT || programInterface == GL_BUFFER_VARIABLE ||
programInterface == GL_TRANSFORM_FEEDBACK_VARYING ||
(prop == GL_ARRAY_SIZE && isSubroutineUniform);
case GL_OFFSET:
return programInterface == GL_UNIFORM || programInterface == GL_BUFFER_VARIABLE ||
programInterface == GL_TRANSFORM_FEEDBACK_VARYING;
case GL_BLOCK_INDEX:
case GL_ARRAY_STRIDE:
case GL_MATRIX_STRIDE:
case GL_IS_ROW_MAJOR:
return programInterface == GL_UNIFORM || programInterface == GL_BUFFER_VARIABLE;
case GL_ATOMIC_COUNTER_BUFFER_INDEX:
return programInterface == GL_UNIFORM;
case GL_BUFFER_BINDING:
case GL_NUM_ACTIVE_VARIABLES:
case GL_ACTIVE_VARIABLES:
// Table 7.2 lists GL_TRANSFORM_FEEDBACK_BUFFER on these three rows too. This
// implementation enumerates no resources on that interface, so the query still
// ends in an error - but INVALID_VALUE for the out-of-range index, not the
// INVALID_OPERATION a narrower table would invent.
return programInterface == GL_UNIFORM_BLOCK || programInterface == GL_ATOMIC_COUNTER_BUFFER ||
programInterface == GL_SHADER_STORAGE_BLOCK ||
programInterface == GL_TRANSFORM_FEEDBACK_BUFFER;
case GL_BUFFER_DATA_SIZE:
return programInterface == GL_UNIFORM_BLOCK || programInterface == GL_ATOMIC_COUNTER_BUFFER ||
programInterface == GL_SHADER_STORAGE_BLOCK;
case GL_REFERENCED_BY_VERTEX_SHADER:
case GL_REFERENCED_BY_TESS_CONTROL_SHADER:
case GL_REFERENCED_BY_TESS_EVALUATION_SHADER:
case GL_REFERENCED_BY_GEOMETRY_SHADER:
case GL_REFERENCED_BY_FRAGMENT_SHADER:
case GL_REFERENCED_BY_COMPUTE_SHADER:
return programInterface == GL_UNIFORM || programInterface == GL_UNIFORM_BLOCK ||
programInterface == GL_ATOMIC_COUNTER_BUFFER || programInterface == GL_BUFFER_VARIABLE ||
programInterface == GL_SHADER_STORAGE_BLOCK || programInterface == GL_PROGRAM_INPUT ||
programInterface == GL_PROGRAM_OUTPUT || isSubroutineUniform;
case GL_TOP_LEVEL_ARRAY_SIZE:
case GL_TOP_LEVEL_ARRAY_STRIDE:
return programInterface == GL_BUFFER_VARIABLE;
case GL_LOCATION:
return InterfaceHasLocations(programInterface);
case GL_LOCATION_INDEX:
return programInterface == GL_PROGRAM_OUTPUT;
case GL_IS_PER_PATCH:
case GL_LOCATION_COMPONENT:
return programInterface == GL_PROGRAM_INPUT || programInterface == GL_PROGRAM_OUTPUT;
case GL_TRANSFORM_FEEDBACK_BUFFER_INDEX:
return programInterface == GL_TRANSFORM_FEEDBACK_VARYING;
case GL_TRANSFORM_FEEDBACK_BUFFER_STRIDE:
return programInterface == GL_TRANSFORM_FEEDBACK_BUFFER;
case GL_NUM_COMPATIBLE_SUBROUTINES:
case GL_COMPATIBLE_SUBROUTINES:
return isSubroutineUniform;
default:
(void)isSubroutine;
return false;
}
}
Int GetActiveResourceCount(ProgramObject& program, GLenum programInterface) {
const Model model = BuildModel(program);
return static_cast<Int>(Select(model, programInterface).size());
}
Int GetMaxNameLength(ProgramObject& program, GLenum programInterface) {
if (!IsNamedInterface(programInterface)) return 0;
const Model model = BuildModel(program);
SizeT longest = 0;
for (const Resource& resource : Select(model, programInterface)) {
longest = std::max(longest, resource.name.length() + 1);
}
return static_cast<Int>(longest);
}
Int GetMaxNumActiveVariables(ProgramObject& program, GLenum programInterface) {
const Model model = BuildModel(program);
SizeT longest = 0;
for (const Resource& resource : Select(model, programInterface)) {
longest = std::max(longest, resource.activeVariables.size());
}
return static_cast<Int>(longest);
}
GLuint GetResourceIndex(ProgramObject& program, GLenum programInterface, const char* name) {
if (name == nullptr || name[0] == '\0') return GL_INVALID_INDEX;
const Model model = BuildModel(program);
const ResourceList& resources = Select(model, programInterface);
const String query = name;
// The layout controls of an interleaved capture are enumerable but not addressable
// by name (GL 4.6 §7.3.1.1).
if (programInterface == GL_TRANSFORM_FEEDBACK_VARYING &&
(query == "gl_NextBuffer" ||
(query.size() == 18 && query.compare(0, 17, "gl_SkipComponents") == 0))) {
return GL_INVALID_INDEX;
}
for (SizeT i = 0; i < resources.size(); ++i) {
if (NamesMatch(resources[i].name, query)) return static_cast<GLuint>(i);
}
return GL_INVALID_INDEX;
}
Bool GetResourceName(ProgramObject& program, GLenum programInterface, GLuint index, String& outName) {
const Model model = BuildModel(program);
const ResourceList& resources = Select(model, programInterface);
if (index >= resources.size()) return false;
outName = resources[index].name;
return true;
}
Bool GetResourceProp(ProgramObject& program, GLenum programInterface, GLuint index, GLenum prop,
Vector<GLint>& outValues) {
const Model model = BuildModel(program);
const ResourceList& resources = Select(model, programInterface);
if (index >= resources.size()) return false;
const Resource& resource = resources[index];
const auto referencedBy = [&resource](EShLanguage stage) {
return (resource.stages & static_cast<Uint32>(1u << stage)) != 0 ? GL_TRUE : GL_FALSE;
};
switch (prop) {
case GL_NAME_LENGTH:
outValues.push_back(static_cast<GLint>(resource.name.length() + 1));
break;
case GL_TYPE:
outValues.push_back(static_cast<GLint>(resource.type));
break;
case GL_ARRAY_SIZE:
outValues.push_back(resource.arraySize);
break;
case GL_OFFSET:
outValues.push_back(resource.offset);
break;
case GL_BLOCK_INDEX:
outValues.push_back(resource.blockIndex);
break;
case GL_ARRAY_STRIDE:
outValues.push_back(resource.arrayStride);
break;
case GL_MATRIX_STRIDE:
outValues.push_back(resource.matrixStride);
break;
case GL_IS_ROW_MAJOR:
outValues.push_back(resource.isRowMajor);
break;
case GL_ATOMIC_COUNTER_BUFFER_INDEX:
outValues.push_back(resource.atomicCounterBufferIndex);
break;
case GL_BUFFER_BINDING:
outValues.push_back(resource.bufferBinding);
break;
case GL_BUFFER_DATA_SIZE:
outValues.push_back(resource.bufferDataSize);
break;
case GL_NUM_ACTIVE_VARIABLES:
outValues.push_back(static_cast<GLint>(resource.activeVariables.size()));
break;
case GL_ACTIVE_VARIABLES:
for (const GLuint variable : resource.activeVariables) outValues.push_back(static_cast<GLint>(variable));
break;
case GL_REFERENCED_BY_VERTEX_SHADER:
outValues.push_back(referencedBy(EShLangVertex));
break;
case GL_REFERENCED_BY_TESS_CONTROL_SHADER:
outValues.push_back(referencedBy(EShLangTessControl));
break;
case GL_REFERENCED_BY_TESS_EVALUATION_SHADER:
outValues.push_back(referencedBy(EShLangTessEvaluation));
break;
case GL_REFERENCED_BY_GEOMETRY_SHADER:
outValues.push_back(referencedBy(EShLangGeometry));
break;
case GL_REFERENCED_BY_FRAGMENT_SHADER:
outValues.push_back(referencedBy(EShLangFragment));
break;
case GL_REFERENCED_BY_COMPUTE_SHADER:
outValues.push_back(referencedBy(EShLangCompute));
break;
case GL_TOP_LEVEL_ARRAY_SIZE:
outValues.push_back(resource.topLevelArraySize);
break;
case GL_TOP_LEVEL_ARRAY_STRIDE:
outValues.push_back(resource.topLevelArrayStride);
break;
case GL_LOCATION:
outValues.push_back(resource.location);
break;
case GL_LOCATION_INDEX:
outValues.push_back(resource.locationIndex);
break;
case GL_IS_PER_PATCH:
outValues.push_back(resource.isPerPatch);
break;
case GL_LOCATION_COMPONENT:
outValues.push_back(0);
break;
case GL_TRANSFORM_FEEDBACK_BUFFER_INDEX:
outValues.push_back(resource.xfbBufferIndex);
break;
default:
outValues.push_back(0);
break;
}
return true;
}
GLint GetResourceLocation(ProgramObject& program, GLenum programInterface, const char* name) {
if (name == nullptr || name[0] == '\0') return -1;
const String query = name;
String base;
Uint element = 0;
Bool malformed = false;
const Bool subscripted = SplitTrailingSubscript(query, base, element, malformed);
if (malformed) return -1;
const Model model = BuildModel(program);
const ResourceList& resources = Select(model, programInterface);
for (const Resource& resource : resources) {
if (NamesMatch(resource.name, query)) return resource.location;
}
if (!subscripted || element == 0) return -1;
// "d[1]" addresses the second element of an array resource enumerated as "d[0]".
for (const Resource& resource : resources) {
if (!NamesMatch(resource.name, base)) continue;
if (resource.location < 0 || static_cast<GLint>(element) >= resource.arraySize) return -1;
return resource.location + static_cast<GLint>(element);
}
return -1;
}
GLint GetResourceLocationIndex(ProgramObject& program, GLenum programInterface, const char* name) {
if (programInterface != GL_PROGRAM_OUTPUT || name == nullptr || name[0] == '\0') return -1;
const String query = name;
String base;
Uint element = 0;
Bool malformed = false;
const Bool subscripted = SplitTrailingSubscript(query, base, element, malformed);
if (malformed) return -1;
const Model model = BuildModel(program);
for (const Resource& resource : model.programOutputs) {
if (NamesMatch(resource.name, query)) return resource.locationIndex;
}
if (!subscripted) return -1;
for (const Resource& resource : model.programOutputs) {
if (!NamesMatch(resource.name, base)) continue;
if (resource.location < 0 || static_cast<GLint>(element) >= resource.arraySize) return -1;
return resource.locationIndex;
}
return -1;
}
} // namespace MobileGL::MG_Impl::GLImpl::ProgramInterface
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