Extract node lifecycle, preview runtime, and Win32 input state

src/legacy_node_stroke_preview_runtime_services.h

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+#pragma once
+
+#include "../libs/glm/glm/ext/matrix_float4x4.hpp"
+#include "../libs/glm/glm/ext/vector_float2.hpp"
+
+#include "brush.h"
+#include "legacy_node_stroke_preview_draw_services.h"
+#include "renderer_api/renderer_api.h"
+#include "rtt.h"
+#include "texture.h"
+
+#include <cmath>
+#include <functional>
+#include <memory>
+
+namespace pp::panopainter {
+
+struct LegacyNodeStrokePreviewImmediateRuntimeRequest {
+    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<void(bool)> set_blend_enabled;
+    std::function<void(const LegacyStrokeShaderSetupUniforms&)> setup_stroke_shader;
+    std::function<void(const Brush&)> bind_dual_pass_textures;
+    std::function<void(bool)> capture_background;
+    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()> unbind_mixer_texture;
+    std::function<void()> bind_pattern_texture;
+    std::function<void()> draw_composite;
+};
+
+[[nodiscard]] bool execute_legacy_node_stroke_preview_immediate_runtime(
+    const LegacyNodeStrokePreviewImmediateRuntimeRequest& request);
+
+} // namespace pp::panopainter