HLSL: Add EOpMatrixSwizzle, selectively decomposed to other ops, for issue #670.

SPIRV/GlslangToSpv.cpp

@@ -1115,6 +1115,9 @@ bool TGlslangToSpvTraverser::visitBinary(glslang::TVisit /* visit */, glslang::T
             builder.accessChainPushSwizzle(swizzle, convertGlslangToSpvType(node->getLeft()->getType()));
         }
         return false;
+    case glslang::EOpMatrixSwizzle:
+        logger->missingFunctionality("matrix swizzle");
+        return true;
     case glslang::EOpLogicalOr:
     case glslang::EOpLogicalAnd:
         {

Test/hlsl.matrixSwizzle.vert

@@ -2,9 +2,32 @@ void ShaderFunction(float inf) : COLOR0
 {
     float3x4 m;
 
+    // tests that convert to non-matrix swizzles
+
     m._34  = 1.0; // AST should have a normal component select
     m._m23 = 2.0; // same code
+    m[2][3] = 2.0; // same code
 
     m._11_12_13_14 = float4(3.0);      // AST should have normal column selection (first row)
     m._m10_m11_m12_m13 = float4(3.0);  // AST should have normal column selection (second row)
+    m[1] = float4(3.0);                // same code
+
+    // tests that stay as matrix swizzles
+
+    float3 f3;
+    m._11_22_23 = f3;
+    m._21_12_31 = float3(5.0);
+    m._11_12_21 = 2 * f3;
+
+    // r-value
+    f3 = m._21_12_31;
+}
+
+float3x3 createMat3x3(float3 a, float3 b, float3 c)
+{
+    float3x3 m;
+    m._11_21_31 = a;
+    m._12_22_32 = b;
+    m._13_23_33 = c;
+    return m;
 }

glslang/Include/intermediate.h

@@ -626,6 +626,9 @@ enum TOperator {
     // geometry methods
     EOpMethodAppend,                     // Geometry shader methods
     EOpMethodRestartStrip,               // ...
+
+    // matrix
+    EOpMatrixSwizzle,                    // select multiple matrix components (non-column)
 };
 
 class TIntermTraverser;

glslang/Include/revision.h

@@ -2,5 +2,5 @@
 // For the version, it uses the latest git tag followed by the number of commits.
 // For the date, it uses the current date (when then script is run).
 
-#define GLSLANG_REVISION "Overload400-PrecQual.1764"
-#define GLSLANG_DATE "12-Jan-2017"
+#define GLSLANG_REVISION "Overload400-PrecQual.1766"
+#define GLSLANG_DATE "13-Jan-2017"

glslang/MachineIndependent/Intermediate.cpp

@@ -1408,6 +1408,26 @@ TIntermTyped* TIntermediate::addSwizzle(TVectorFields& fields, const TSourceLoc&
     return node;
 }
 
+// A matrix swizzle is a sequence of nodes, 2N long, where N is the
+// number of components in the swizzle, alternating col,row, col,row, ...
+TIntermTyped* TIntermediate::addSwizzle(TMatrixComponents& comps, const TSourceLoc& loc)
+{
+    TIntermAggregate* node = new TIntermAggregate(EOpSequence);
+
+    node->setLoc(loc);
+    TIntermConstantUnion* constIntNode;
+    TIntermSequence &sequenceVector = node->getSequence();
+
+    for (int i = 0; i < comps.size(); i++) {
+        constIntNode = addConstantUnion(comps.get(i).coord1, loc);
+        sequenceVector.push_back(constIntNode);
+        constIntNode = addConstantUnion(comps.get(i).coord2, loc);
+        sequenceVector.push_back(constIntNode);
+    }
+
+    return node;
+}
+
 //
 // Follow the left branches down to the root of an l-value
 // expression (just "." and []).
@@ -1425,10 +1445,10 @@ const TIntermTyped* TIntermediate::findLValueBase(const TIntermTyped* node, bool
         if (binary == nullptr)
             return node;
         TOperator op = binary->getOp();
-        if (op != EOpIndexDirect && op != EOpIndexIndirect && op != EOpIndexDirectStruct && op != EOpVectorSwizzle)
+        if (op != EOpIndexDirect && op != EOpIndexIndirect && op != EOpIndexDirectStruct && op != EOpVectorSwizzle && op != EOpMatrixSwizzle)
             return nullptr;
         if (! swizzleOkay) {
-            if (op == EOpVectorSwizzle)
+            if (op == EOpVectorSwizzle || op == EOpMatrixSwizzle)
                 return nullptr;
             if ((op == EOpIndexDirect || op == EOpIndexIndirect) &&
                 (binary->getLeft()->getType().isVector() || binary->getLeft()->getType().isScalar()) &&

glslang/MachineIndependent/ParseContextBase.cpp

@@ -129,6 +129,7 @@ bool TParseContextBase::lValueErrorCheck(const TSourceLoc& loc, const char* op,
         case EOpIndexIndirect:     // fall through
         case EOpIndexDirectStruct: // fall through
         case EOpVectorSwizzle:
+        case EOpMatrixSwizzle:
             return lValueErrorCheck(loc, op, binaryNode->getLeft());
         default:
             break;
@@ -208,6 +209,7 @@ void TParseContextBase::rValueErrorCheck(const TSourceLoc& loc, const char* op,
         case EOpIndexIndirect:
         case EOpIndexDirectStruct:
         case EOpVectorSwizzle:
+        case EOpMatrixSwizzle:
             rValueErrorCheck(loc, op, binaryNode->getLeft());
         default:
             break;

glslang/MachineIndependent/intermOut.cpp

@@ -146,6 +146,7 @@ bool TOutputTraverser::visitBinary(TVisit /* visit */, TIntermBinary* node)
         out.debug << (*node->getLeft()->getType().getStruct())[node->getRight()->getAsConstantUnion()->getConstArray()[0].getIConst()].type->getFieldName();
         out.debug << ": direct index for structure";      break;
     case EOpVectorSwizzle: out.debug << "vector swizzle"; break;
+    case EOpMatrixSwizzle: out.debug << "matrix swizzle"; break;
 
     case EOpAdd:    out.debug << "add";                     break;
     case EOpSub:    out.debug << "subtract";                break;

glslang/MachineIndependent/localintermediate.h

@@ -275,6 +275,7 @@ public:
     TIntermBranch* addBranch(TOperator, const TSourceLoc&);
     TIntermBranch* addBranch(TOperator, TIntermTyped*, const TSourceLoc&);
     TIntermTyped* addSwizzle(TVectorFields&, const TSourceLoc&);
+    TIntermTyped* addSwizzle(TMatrixComponents&, const TSourceLoc&);
 
     // Low level functions to add nodes (no conversions or other higher level transformations)
     // If a type is provided, the node's type will be set to it.

glslang/MachineIndependent/propagateNoContraction.cpp

@@ -90,6 +90,7 @@ bool isDereferenceOperation(glslang::TOperator op)
     case glslang::EOpIndexDirectStruct:
     case glslang::EOpIndexIndirect:
     case glslang::EOpVectorSwizzle:
+    case glslang::EOpMatrixSwizzle:
         return true;
     default:
         return false;

hlsl/hlslParseHelper.cpp

@@ -966,10 +966,9 @@ TIntermTyped* HlslParseContext::handleDotDereference(const TSourceLoc& loc, TInt
                 result = intermediate.addIndex(EOpIndexDirect, base, index, loc);
                 result->setType(TType(base->getBasicType(), EvqTemporary));
             } else {
-                TString vectorString = field;
                 TIntermTyped* index = intermediate.addSwizzle(fields, loc);
                 result = intermediate.addIndex(EOpVectorSwizzle, base, index, loc);
-                result->setType(TType(base->getBasicType(), EvqTemporary, base->getType().getQualifier().precision, (int)vectorString.size()));
+                result->setType(TType(base->getBasicType(), EvqTemporary, base->getType().getQualifier().precision, fields.num));
             }
         }
     } else if (base->isMatrix()) {
@@ -979,7 +978,7 @@ TIntermTyped* HlslParseContext::handleDotDereference(const TSourceLoc& loc, TInt
 
         if (comps.size() == 1) {
             // Representable by m[c][r]
-            if (base->getType().getQualifier().storage == EvqConst) {
+            if (base->getType().getQualifier().isFrontEndConstant()) {
                 result = intermediate.foldDereference(base, comps.get(0).coord1, loc);
                 result = intermediate.foldDereference(result, comps.get(1).coord2, loc);
             } else {
@@ -994,7 +993,7 @@ TIntermTyped* HlslParseContext::handleDotDereference(const TSourceLoc& loc, TInt
             int column = getMatrixComponentsColumn(base->getMatrixRows(), comps);
             if (column >= 0) {
                 // Representable by m[c]
-                if (base->getType().getQualifier().storage == EvqConst)
+                if (base->getType().getQualifier().isFrontEndConstant())
                     result = intermediate.foldDereference(base, column, loc);
                 else {
                     result = intermediate.addIndex(EOpIndexDirect, base, intermediate.addConstantUnion(column, loc), loc);
@@ -1003,8 +1002,10 @@ TIntermTyped* HlslParseContext::handleDotDereference(const TSourceLoc& loc, TInt
                 }
             } else {
                 // general case, not a column, not a single component
-                error(loc, "arbitrary matrix component selection not supported", field.c_str(), "");
-            }
+                TIntermTyped* index = intermediate.addSwizzle(comps, loc);
+                result = intermediate.addIndex(EOpMatrixSwizzle, base, index, loc);
+                result->setType(TType(base->getBasicType(), EvqTemporary, base->getType().getQualifier().precision, comps.size()));
+           }
         }
     } else if (base->getBasicType() == EbtStruct || base->getBasicType() == EbtBlock) {
         const TTypeList* fields = base->getType().getStruct();
@@ -1888,13 +1889,19 @@ void HlslParseContext::handleFunctionArgument(TFunction* function,
 }
 
 // Some simple source assignments need to be flattened to a sequence
-// of AST assignments.  Catch these and flatten, otherwise, pass through
+// of AST assignments. Catch these and flatten, otherwise, pass through
 // to intermediate.addAssign().
-TIntermTyped* HlslParseContext::handleAssign(const TSourceLoc& loc, TOperator op, TIntermTyped* left, TIntermTyped* right) const
+//
+// Also, assignment to matrix swizzles requires multiple component assignments,
+// intercept those as well.
+TIntermTyped* HlslParseContext::handleAssign(const TSourceLoc& loc, TOperator op, TIntermTyped* left, TIntermTyped* right)
 {
     if (left == nullptr || right == nullptr)
         return nullptr;
 
+    if (left->getAsOperator() && left->getAsOperator()->getOp() == EOpMatrixSwizzle)
+        return handleAssignToMatrixSwizzle(loc, op, left, right);
+
     const bool isSplitLeft    = wasSplit(left);
     const bool isSplitRight   = wasSplit(right);
 
@@ -1902,7 +1909,7 @@ TIntermTyped* HlslParseContext::handleAssign(const TSourceLoc& loc, TOperator op
     const bool isFlattenRight = wasFlattened(right);
 
     // OK to do a single assign if both are split, or both are unsplit.  But if one is and the other
-    // isn't, we fall back to a memberwise copy.
+    // isn't, we fall back to a member-wise copy.
     if (! isFlattenLeft && ! isFlattenRight && !isSplitLeft && !isSplitRight)
         return intermediate.addAssign(op, left, right, loc);
 
@@ -2079,6 +2086,65 @@ TIntermTyped* HlslParseContext::handleAssign(const TSourceLoc& loc, TOperator op
     return assignList;
 }
 
+// An assignment to matrix swizzle must be decomposed into individual assignments.
+// These must be selected component-wise from the RHS and stored component-wise
+// into the LHS.
+TIntermTyped* HlslParseContext::handleAssignToMatrixSwizzle(const TSourceLoc& loc, TOperator op, TIntermTyped* left, TIntermTyped* right)
+{
+    assert(left->getAsOperator() && left->getAsOperator()->getOp() == EOpMatrixSwizzle);
+
+    if (op != EOpAssign)
+        error(loc, "only simple assignment to non-simple matrix swizzle is supported", "assign", "");
+
+    // isolate the matrix and swizzle nodes
+    TIntermTyped* matrix = left->getAsBinaryNode()->getLeft()->getAsTyped();
+    const TIntermSequence& swizzle = left->getAsBinaryNode()->getRight()->getAsAggregate()->getSequence();
+
+    // if the RHS isn't already a simple vector, let's store into one
+    TIntermSymbol* vector = right->getAsSymbolNode();
+    TIntermTyped* vectorAssign = nullptr;
+    if (vector == nullptr) {
+        // create a new intermediate vector variable to assign to
+        TType vectorType(matrix->getBasicType(), EvqTemporary, matrix->getQualifier().precision, swizzle.size()/2);
+        vector = intermediate.addSymbol(*makeInternalVariable("intermVec", vectorType), loc);
+
+        // assign the right to the new vector
+        vectorAssign = handleAssign(loc, op, vector, right);
+    }
+
+    // Assign the vector components to the matrix components.
+    // Store this as a sequence, so a single aggregate node represents this
+    // entire operation.
+    TIntermAggregate* result = intermediate.makeAggregate(vectorAssign);
+    TType columnType(matrix->getType(), 0);
+    TType componentType(columnType, 0);
+    TType indexType(EbtInt);
+    for (int i = 0; i < (int)swizzle.size(); i += 2) {
+        // the right component, single index into the RHS vector
+        TIntermTyped* rightComp = intermediate.addIndex(EOpIndexDirect, vector,
+                                    intermediate.addConstantUnion(i/2, loc), loc);
+
+        // the left component, double index into the LHS matrix
+        TIntermTyped* leftComp = intermediate.addIndex(EOpIndexDirect, matrix,
+                                    intermediate.addConstantUnion(swizzle[i]->getAsConstantUnion()->getConstArray(),
+                                                                  indexType, loc),
+                                    loc);
+        leftComp->setType(columnType);
+        leftComp = intermediate.addIndex(EOpIndexDirect, leftComp,
+                                    intermediate.addConstantUnion(swizzle[i+1]->getAsConstantUnion()->getConstArray(),
+                                                                  indexType, loc),
+                                    loc);
+        leftComp->setType(componentType);
+
+        // Add the assignment to the aggregate
+        result = intermediate.growAggregate(result, intermediate.addAssign(op, leftComp, rightComp, loc));
+    }
+
+    result->setOp(EOpSequence);
+
+    return result;
+}
+
 //
 // HLSL atomic operations have slightly different arguments than
 // GLSL/AST/SPIRV.  The semantics are converted below in decomposeIntrinsic.

hlsl/hlslParseHelper.h

@@ -78,7 +78,8 @@ public:
     void remapNonEntryPointIO(TFunction& function);
     TIntermNode* handleReturnValue(const TSourceLoc&, TIntermTyped*);
     void handleFunctionArgument(TFunction*, TIntermTyped*& arguments, TIntermTyped* newArg);
-    TIntermTyped* handleAssign(const TSourceLoc&, TOperator, TIntermTyped* left, TIntermTyped* right) const;
+    TIntermTyped* handleAssign(const TSourceLoc&, TOperator, TIntermTyped* left, TIntermTyped* right);
+    TIntermTyped* handleAssignToMatrixSwizzle(const TSourceLoc&, TOperator, TIntermTyped* left, TIntermTyped* right);
     TIntermTyped* handleFunctionCall(const TSourceLoc&, TFunction*, TIntermTyped*);
     void decomposeIntrinsic(const TSourceLoc&, TIntermTyped*& node, TIntermNode* arguments);
     void decomposeSampleMethods(const TSourceLoc&, TIntermTyped*& node, TIntermNode* arguments);