From bffae036f77213c30227da196f5ceec969ee7207 Mon Sep 17 00:00:00 2001
From: Victor Brekenfeld <github@drakulix.de>
Date: Mon, 10 Jan 2022 19:16:30 +0100
Subject: [PATCH] gles2: Expose transformation of a `Frame`

---
 src/backend/renderer/gles2/mod.rs | 6 ++++++
 src/backend/renderer/mod.rs       | 3 +++
 wlcs_anvil/src/renderer.rs        | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/src/backend/renderer/gles2/mod.rs b/src/backend/renderer/gles2/mod.rs
index 4b3d825..2ed0649 100644
--- a/src/backend/renderer/gles2/mod.rs
+++ b/src/backend/renderer/gles2/mod.rs
@@ -186,6 +186,7 @@ pub struct Gles2Renderer {
 /// Handle to the currently rendered frame during [`Gles2Renderer::render`](Renderer::render)
 pub struct Gles2Frame {
     current_projection: Matrix3<f32>,
+    transform: Transform,
     gl: ffi::Gles2,
     tex_programs: [Gles2TexProgram; shaders::FRAGMENT_COUNT],
     solid_program: Gles2SolidProgram,
@@ -1129,6 +1130,7 @@ impl Renderer for Gles2Renderer {
             solid_program: self.solid_program.clone(),
             // output transformation passed in by the user
             current_projection: flip180 * transform.matrix() * renderer,
+            transform,
             vbos: self.vbos,
             size,
         };
@@ -1318,6 +1320,10 @@ impl Frame for Gles2Frame {
 
         self.render_texture(texture, mat, Some(&damage), tex_verts, alpha)
     }
+
+    fn transformation(&self) -> Transform {
+        self.transform
+    }
 }
 
 impl Gles2Frame {
diff --git a/src/backend/renderer/mod.rs b/src/backend/renderer/mod.rs
index c84c233..94d34a5 100644
--- a/src/backend/renderer/mod.rs
+++ b/src/backend/renderer/mod.rs
@@ -219,6 +219,9 @@ pub trait Frame {
         src_transform: Transform,
         alpha: f32,
     ) -> Result<(), Self::Error>;
+
+    /// Output transformation that is applied to this frame
+    fn transformation(&self) -> Transform;
 }
 
 /// Abstraction of commonly used rendering operations for compositors.
diff --git a/wlcs_anvil/src/renderer.rs b/wlcs_anvil/src/renderer.rs
index 0ceb21d..bd75ec1 100644
--- a/wlcs_anvil/src/renderer.rs
+++ b/wlcs_anvil/src/renderer.rs
@@ -112,6 +112,10 @@ impl Frame for DummyFrame {
     ) -> Result<(), Self::Error> {
         Ok(())
     }
+
+    fn transformation(&self) -> Transform {
+        Transform::Normal
+    }
 }
 
 pub struct DummyTexture {