Tracing/QmlProfiler: Prepare for porting of shaders to Qt 6

This change touches up the shader handling code in Tracing and
QmlProfiler in order to pave the way for the pending porting of
the shaders to Qt 6.

- Use QSGGeometry::Attribute::createWithAttributeType instead of
  QSGGeometry::Attribute::create
- Undefine some fields that are unused in Qt 6
- Add a couple of comments to document the relation between C++
  variables and shader attributes
- Extract some code into functions

Change-Id: I0e7119484b6190a415a5c2d2a0bbd6465088cf19
Reviewed-by: Henning Gründl <[email protected]>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/libs/tracing/timelineitemsrenderpass.h b/src/libs/tracing/timelineitemsrenderpass.h
index 807f0ed5518..9d52be9ac71 100644
--- a/src/libs/tracing/timelineitemsrenderpass.h
+++ b/src/libs/tracing/timelineitemsrenderpass.h
@@ -48,7 +48,7 @@ public:
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QSGMaterialShader *createShader() const override;
 #else
-    QSGMaterialShader *createShader(QSGRendererInterface::RenderMode renderMode) const override;
+    QSGMaterialShader *createShader(QSGRendererInterface::RenderMode) const override;
 #endif // < Qt 6
 
 private:
@@ -83,8 +83,10 @@ public:
     static OpaqueColoredPoint2DWithSize *fromVertexData(QSGGeometry *geometry);
 
 private:
-    float x, y, w, h, id;
-    unsigned char r, g, b, a;
+    float x, y; // vec4 vertexCoord
+    float w, h; // vec2 rectSize
+    float id; // float selectionId
+    unsigned char r, g, b, a; // vec4 vertexColor
 
     void setCommon(const OpaqueColoredPoint2DWithSize *master);
     void setLeft(const OpaqueColoredPoint2DWithSize *master);