Share retained stroke texture binding helpers

src/legacy_canvas_stroke_execution_services.h

@@ -37,6 +37,18 @@ struct LegacyStrokeSampleExecutionResult {
     glm::vec4 dirty_bounds {};
 };
 
+enum class LegacyCanvasStrokeTextureInput {
+    brush_tip,
+    stroke_destination,
+    pattern,
+    mixer,
+};
+
+struct LegacyCanvasStrokeTextureBinding {
+    LegacyCanvasStrokeTextureInput input = LegacyCanvasStrokeTextureInput::brush_tip;
+    int slot = 0;
+};
+
 struct LegacyCanvasStrokeFaceDirtyRequest {
     pp::renderer::Extent2D extent {};
     glm::vec4 previous_accumulated_dirty_box {};
@@ -200,6 +212,26 @@ std::size_t execute_legacy_canvas_stroke_frame_faces(
     return executed_faces;
 }
 
+template <typename BindTextureInput, std::size_t BindingCount>
+inline void bind_legacy_canvas_stroke_texture_inputs(
+    const std::array<LegacyCanvasStrokeTextureBinding, BindingCount>& bindings,
+    BindTextureInput&& bind_texture_input)
+{
+    for (const auto& binding : bindings) {
+        bind_texture_input(binding.input, binding.slot);
+    }
+}
+
+template <typename UnbindTextureInput, std::size_t BindingCount>
+inline void unbind_legacy_canvas_stroke_texture_inputs(
+    const std::array<LegacyCanvasStrokeTextureBinding, BindingCount>& bindings,
+    UnbindTextureInput&& unbind_texture_input)
+{
+    for (const auto& binding : bindings) {
+        unbind_texture_input(binding.input, binding.slot);
+    }
+}
+
 template <typename Frames, typename BeginFrame, typename BeginFace, typename ExecuteSample, typename FinishFace>
 std::size_t execute_legacy_canvas_stroke_frame_samples(
     Frames&& frames,