Lancelot test for ShaderEffect atlas textures

Task-number: QTBUG-83975
Pick-to: 5.15
Change-Id: Icfff2aa9172bf10a1918be5364f27ed6faf94575
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 51 insertions, 0 deletions

diff --git a/tests/manual/scenegraph_lancelot/data/shaders/atlas/atlas.qml b/tests/manual/scenegraph_lancelot/data/shaders/atlas/atlas.qml
new file mode 100644
index 0000000000..06c254253e
--- /dev/null
+++ b/tests/manual/scenegraph_lancelot/data/shaders/atlas/atlas.qml
@@ -0,0 +1,51 @@
+import QtQuick 2.15
+
+Item {
+    width: 320
+    height: 480
+
+    Column {
+        spacing: 10
+        padding: 5
+
+        Repeater {
+            model: ["sand_16x16.png", "circle_16x16.png", "star_16x16.png", "square_16x16.png"]
+            Row {
+                spacing: 20
+                Image {
+                    id: img
+                    source: "../../shared/" + modelData
+                }
+
+                // Non-atlased: copies subrect of atlas to a new texture
+                ShaderEffect {
+                    width: img.width
+                    height: img.height
+                    property variant source: img
+                    fragmentShader: "qrc:shaders/gradientgrid.frag"
+                    supportsAtlasTextures: false
+                }
+
+                // Atlased: qt_MultiTexCoord0 points to the atlas subrect
+                ShaderEffect {
+                    width: img.width
+                    height: img.height
+                    property variant source: img
+                    fragmentShader: "qrc:shaders/gradientgrid.frag"
+                    supportsAtlasTextures: true
+                }
+
+                // Subrect mode: qt_MultiTexCoord0 goes from 0.0 to 1.0,
+                // and qt_Subrect_source specifies the atlas subrect
+                ShaderEffect {
+                    width: img.width
+                    height: img.height
+                    property variant source: img
+                    fragmentShader: "qrc:shaders/gradientgrid.frag"
+                    vertexShader: "qrc:shaders/subrect.vert"
+                    supportsAtlasTextures: false
+                }
+            }
+        }
+    }
+}