QShaderGenerator: add a #define LAYER_name for each layer

This will make it more convenient to insert conditional code
based on whether a layer is defined or not.

Change-Id: Ia72b569f022dd2ee723bf2493710eab709042639
Reviewed-by: Mike Krus <mike.krus@kdab.com>
(cherry picked from commit 7889cf1c6f9790391690ce31f391529b2dd8230e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/render/shadergraph/qshadergenerator.cpp b/src/render/shadergraph/qshadergenerator.cpp
index f80502fcc..a33110719 100644
--- a/src/render/shadergraph/qshadergenerator.cpp
+++ b/src/render/shadergraph/qshadergenerator.cpp
@@ -507,6 +507,17 @@ namespace
         }
         }
     }
+
+    QByteArrayList layerDefines(const QStringList &enabledLayers) noexcept
+    {
+        QByteArrayList defines;
+        const QString defineTemplate = QStringLiteral("#define LAYER_%1");
+
+        for (const QString &layer : enabledLayers)
+            defines << defineTemplate.arg(layer).toUtf8();
+
+        return defines;
+    }
 }
 
 QByteArray QShaderGenerator::createShaderCode(const QStringList &enabledLayers) const
@@ -518,6 +529,7 @@ QByteArray QShaderGenerator::createShaderCode(const QStringList &enabledLayers)
 
     code << versionString(format);
     code << QByteArray();
+    code << layerDefines(enabledLayers);
 
     if (format.api() == QShaderFormat::VulkanFlavoredGLSL || format.api() == QShaderFormat::RHI) {
         GLSL45HeaderWriter builder;