4 files changed, 44 insertions, 0 deletions
diff --git a/src/gui/painting/shaders/backingstorecompose.frag b/src/gui/painting/shaders/backingstorecompose.frag
new file mode 100644
index 0000000000..3b08ade035
--- /dev/null
+++ b/src/gui/painting/shaders/backingstorecompose.frag
@@ -0,0 +1,25 @@
+#version 440
+
+layout(location = 0) in vec2 v_texcoord;
+layout(location = 0) out vec4 fragColor;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 vertexTransform;
+    mat3 textureTransform;
+    float opacity;
+    int textureSwizzle;
+};
+
+layout(binding = 1) uniform sampler2D textureSampler;
+
+void main()
+{
+    vec4 tmpFragColor = texture(textureSampler, v_texcoord);
+    tmpFragColor.a *= opacity;
+    if (textureSwizzle == 0)
+        fragColor = tmpFragColor;
+    else if(textureSwizzle == 2)
+        fragColor.argb = tmpFragColor;
+    else
+        fragColor.bgra = tmpFragColor;
+}
diff --git a/src/gui/painting/shaders/backingstorecompose.frag.qsb b/src/gui/painting/shaders/backingstorecompose.frag.qsb
new file mode 100644
index 0000000000..63ba55eed8
--- /dev/null
+++ b/src/gui/painting/shaders/backingstorecompose.frag.qsb
diff --git a/src/gui/painting/shaders/backingstorecompose.vert b/src/gui/painting/shaders/backingstorecompose.vert
new file mode 100644
index 0000000000..0c72c97419
--- /dev/null
+++ b/src/gui/painting/shaders/backingstorecompose.vert
@@ -0,0 +1,19 @@
+#version 440
+
+layout(location = 0) in vec3 position;
+layout(location = 1) in vec2 texcoord;
+
+layout(location = 0) out vec2 v_texcoord;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 vertexTransform;
+    mat3 textureTransform;
+    float opacity;
+    int textureSwizzle;
+};
+
+void main()
+{
+    v_texcoord = (textureTransform * vec3(texcoord, 1.0)).xy;
+    gl_Position = vertexTransform * vec4(position, 1.0);
+}
diff --git a/src/gui/painting/shaders/backingstorecompose.vert.qsb b/src/gui/painting/shaders/backingstorecompose.vert.qsb
new file mode 100644
index 0000000000..1aa6e661f8
--- /dev/null
+++ b/src/gui/painting/shaders/backingstorecompose.vert.qsb