Fix nonsquare matrix construction from scalar

Matrix is laid out in column-major order, so the stride between elements
on the main diagonal is #rows + 1, not #columns + 1.

Bug: b/116263076
Change-Id: I00994b663bc4229e24f8ae1b7fa518caa0e7ea71
Reviewed-on: https://swiftshader-review.googlesource.com/20768
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>

src/OpenGL/compiler/parseConst.cpp

diff --git a/src/OpenGL/compiler/parseConst.cpp b/src/OpenGL/compiler/parseConst.cpp
index c3e0b0c..26af408 100644
--- a/src/OpenGL/compiler/parseConst.cpp
+++ b/src/OpenGL/compiler/parseConst.cpp
@@ -30,7 +30,7 @@
 		  infoSink(sink),
 		  size(0),
 		  isMatrix(false),
-		  matrixSize(0) {
+		  matrixRows(0) {
 	}
 
 	bool error;
@@ -53,7 +53,7 @@
 	TInfoSink& infoSink;
 	size_t size; // size of the constructor ( 4 for vec4)
 	bool isMatrix;
-	int matrixSize; // dimension of the matrix (nominal size and not the instance size)
+	int matrixRows; // number of rows in the matrix (nominal size and not the instance size)
 };
 
 //
@@ -124,7 +124,7 @@
 
 		if (node->getType().isMatrix()) {
 			isMatrix = true;
-			matrixSize = node->getType().getNominalSize();
+			matrixRows = node->getType().getSecondarySize();
 		}
 	}
 
@@ -142,7 +142,7 @@
 		constructorType = EOpNull;
 		size = 0;
 		isMatrix = false;
-		matrixSize = 0;
+		matrixRows = 0;
 	}
 	return false;
 }
@@ -203,7 +203,7 @@
 			for(size_t i = index; i < totalSize; i++) {
 				if (i >= instanceSize)
 					return;
-				if (element - i == 0 || (i - element) % (matrixSize + 1) == 0 )
+				if (element - i == 0 || (i - element) % (matrixRows + 1) == 0 )
 					leftUnionArray[i].cast(basicType, rightUnionArray[0]);
 				else
 					leftUnionArray[i].setFConst(0.0f);