Thin brush panel, preview, and node utility shells

src/legacy_node_stroke_preview_runtime_services.h

@@ -95,6 +95,36 @@ struct LegacyNodeStrokePreviewImmediateRuntimeRequest {
     std::function<void()> draw_composite;
 };
 
+struct LegacyNodeStrokePreviewImmediateDrawRequest {
+    const std::shared_ptr<Brush>& brush;
+    glm::vec2 preview_size {};
+    float zoom = 1.0f;
+    float min_flow = 0.0f;
+    float stroke_max_size_override = 0.0f;
+    float pad_override = NAN;
+    float camera_fov = 0.0f;
+    glm::mat4 camera_rot { 1.0f };
+    pp::renderer::RenderDeviceFeatures render_device_features {};
+    RTT& preview_rtt;
+    RTT& preview_rtt_mixer;
+    Texture2D& preview_stroke_texture;
+    Texture2D& preview_dual_texture;
+    Texture2D& preview_background_texture;
+    Texture2D& preview_image_texture;
+    Sampler& linear_sampler;
+    Sampler& repeat_sampler;
+    std::function<void()> prepare_render_target;
+    std::function<void()> finish_render_target;
+    std::function<std::vector<LegacyNodeStrokePreviewFrame>(const Stroke&, float)> compute_frames;
+    std::function<glm::vec4(std::array<vertex_t, 4>&, Texture2D&, bool)> draw_samples;
+    std::function<void(const glm::vec2&, const glm::vec2&)> draw_mix;
+    std::function<void()> draw_checkerboard;
+    std::function<void()> draw_composite;
+};
+
+[[nodiscard]] bool execute_legacy_node_stroke_preview_immediate_draw(
+    const LegacyNodeStrokePreviewImmediateDrawRequest& request);
+
 [[nodiscard]] bool execute_legacy_node_stroke_preview_immediate_runtime(
     const LegacyNodeStrokePreviewImmediateRuntimeRequest& request);