[feat]: work on render path exporting

1 files changed, 14 insertions, 0 deletions

diff --git a/src/rendering/rhi.h b/src/rendering/rhi.h
index e4e7e62..6a2042a 100644
--- a/src/rendering/rhi.h
+++ b/src/rendering/rhi.h
@@ -22,6 +22,7 @@ namespace Donut::RHI
         Swapchain,  // a pipeline's colour target = the presented image (resolved per backend)
         RGBA8,      // 8-bit unorm colour (LDR / off-screen)
         RGBA16F,    // half-float colour (HDR / cubemap)
+        RGBA32F,    // full-float colour (raw observable export)
         D32,        // 32-bit depth
     };
 
@@ -146,6 +147,19 @@ namespace Donut::RHI
         virtual auto begin_frame(const glm::vec4& clear) -> CommandList* = 0;
         virtual auto end_frame() -> void = 0;
 
+        // One-shot off-screen work outside the frame loop (used by the exporter):
+        // records a self-contained pass into a transient command list and blocks
+        // until the GPU finishes, so the target can be read back immediately.
+        virtual auto run_offscreen(const std::function<void(CommandList&)>& record) -> void = 0;
+
+        // Reads a render target's colour back to the CPU as tightly-packed RGBA8,
+        // top-left origin (out is resized to width*height*4). For export/analysis.
+        virtual auto read_render_target(RenderTarget* target, std::vector<uint8_t>& out) -> void = 0;
+
+        // Same, but as full-float RGBA (out resized to width*height*4 floats). Read
+        // an RGBA32F target back for raw observable export.
+        virtual auto read_render_target_float(RenderTarget* target, std::vector<float>& out) -> void = 0;
+
         // ImGui lives above the RHI but its platform/render backend is per-device.
         virtual auto init_imgui() -> void = 0;
         virtual auto imgui_new_frame() -> void = 0;