Add renderer frame capture contract

src/renderer_api/recording_renderer.cpp

@@ -202,6 +202,32 @@ pp::foundation::Status RecordingCommandContext::read_texture(
     return pp::foundation::Status::success();
 }
 
+pp::foundation::Status RecordingCommandContext::capture_frame(
+    IRenderTarget& target,
+    IReadbackBuffer& destination) noexcept
+{
+    if (in_render_pass_) {
+        return pp::foundation::Status::invalid_argument("frame capture must be outside a render pass");
+    }
+
+    const auto desc = target.color_desc();
+    const auto bytes = frame_capture_byte_size(desc);
+    if (!bytes) {
+        return bytes.status();
+    }
+
+    if (destination.size_bytes() < bytes.value()) {
+        return pp::foundation::Status::out_of_range("frame capture buffer is too small");
+    }
+
+    push_command(commands_, RecordedRenderCommand {
+        .kind = RecordedRenderCommandKind::capture_frame,
+        .target_desc = desc,
+        .capture_bytes = bytes.value(),
+    });
+    return pp::foundation::Status::success();
+}
+
 void RecordingCommandContext::end_render_pass() noexcept
 {
     if (!in_render_pass_) {
@@ -281,6 +307,8 @@ const char* recorded_render_command_kind_name(RecordedRenderCommandKind kind) no
         return "draw";
     case RecordedRenderCommandKind::read_texture:
         return "read_texture";
+    case RecordedRenderCommandKind::capture_frame:
+        return "capture_frame";
     case RecordedRenderCommandKind::end_render_pass:
         return "end_render_pass";
     case RecordedRenderCommandKind::trace_marker: