From eaae60886c432b6d9d5862a04f3abf03f7a13fee Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 9 Apr 2025 20:32:12 +0100
Subject: Reasonably function asset viewing functionality

---
 application/resviewer.cpp | 155 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 154 insertions(+), 1 deletion(-)

diff --git a/application/resviewer.cpp b/application/resviewer.cpp
index 2eb40f2..e512b41 100644
--- a/application/resviewer.cpp
+++ b/application/resviewer.cpp
@@ -1,13 +1,165 @@
 #include <backends/imgui_impl_opengl3.h>
 #include <backends/imgui_impl_sdl2.h>
+#include <game/environment.h>
 #include <game/gamestate.h>
+#include <game/terrain.h>
 #include <gfx/gl/sceneProvider.h>
 #include <gfx/gl/sceneRenderer.h>
+#include <gfx/renderable.h>
+#include <location.h>
 #include <ui/applicationBase.h>
 #include <ui/mainApplication.h>
 #include <ui/mainWindow.h>
 
 constexpr ScreenAbsCoord DEFAULT_WINDOW_SIZE {800, 600};
+constexpr GlobalDistance TERRAIN_LIMIT = 1'000'000;
+constexpr GlobalDistance TERRAIN_HEIGHT = 10'000;
+constexpr RelativeDistance DEFAULT_CAMERA_DIST = 7'000;
+constexpr GlobalDistance DEFAULT_CAMERA_HEIGHT = 5'000;
+constexpr GlobalDistance DEFAULT_CAMERA_FOCUS = 3'000;
+constexpr GlobalDistance MAX_CAMERA_HEIGHT = 10'000;
+constexpr GlobalDistance MIN_CAMERA_DIST = 1'000;
+constexpr GlobalDistance MAX_CAMERA_DIST = 30'000;
+
+class ViewerContent : public WindowContent, SceneRenderer, SceneProvider {
+public:
+	ViewerContent(ScreenAbsCoord size, std::span<char * const> files) : SceneRenderer {size, 0}, fileList(files)
+	{
+		camera.setPosition(calcCameraPosition());
+		camera.lookAt({0, 0, TERRAIN_HEIGHT + cameraFocus});
+		gameState->terrain = std::make_shared<Terrain>(
+				GeoData::createFlat({-TERRAIN_LIMIT, -TERRAIN_LIMIT}, {TERRAIN_LIMIT, TERRAIN_LIMIT}, TERRAIN_HEIGHT));
+	}
+
+private:
+	[[nodiscard]]
+	GlobalPosition3D
+	calcCameraPosition() const
+	{
+		return {sincos(cameraAngle) * cameraDistance, TERRAIN_HEIGHT + cameraHeight};
+	}
+
+	void
+	render() override
+	{
+		SceneRenderer::render(*this);
+		controls();
+	}
+
+	void
+	tick(TickDuration tick) override
+	{
+		if (autoRotate != 0) {
+			cameraAngle = normalize(cameraAngle + autoRotate * tick.count());
+			camera.setPosition(calcCameraPosition());
+			camera.lookAt({0, 0, TERRAIN_HEIGHT + cameraFocus});
+		}
+	}
+
+	bool
+	handleInput(const SDL_Event & event) override
+	{
+		if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_RESIZED) {
+			SceneRenderer::resize({event.window.data1, event.window.data2});
+		}
+
+		return WindowContent::handleInput(event);
+	}
+
+	void
+	controls()
+	{
+		if (ImGui::Begin("Resource view")) {
+			ImGui::SetWindowSize({});
+			fileSelection();
+			assetSelection();
+		}
+		ImGui::End();
+
+		if (ImGui::Begin("Camera")) {
+			ImGui::SetWindowSize({});
+			if (std::max({ImGui::SliderFloat("Camera position", &cameraAngle, -pi, pi),
+						ImGui::SliderInt("Camera focus", &cameraFocus, 1, MAX_CAMERA_HEIGHT),
+						ImGui::SliderInt("Camera height", &cameraHeight, 1, MAX_CAMERA_HEIGHT),
+						ImGui::SliderFloat("Camera distance", &cameraDistance, MIN_CAMERA_DIST, MAX_CAMERA_DIST)})) {
+				camera.setPosition(calcCameraPosition());
+				camera.lookAt({0, 0, TERRAIN_HEIGHT + cameraFocus});
+			}
+			ImGui::SliderFloat("Auto rotate speed", &autoRotate, -1, 1);
+		}
+		ImGui::End();
+	}
+
+	void
+	fileSelection()
+	{
+		ImGui::BeginListBox("File");
+		for (const auto file : fileList) {
+			if (ImGui::Selectable(file, file == selectedFile)) {
+				location.reset();
+				selectedAsset = nullptr;
+				gameState->assets = AssetFactory::loadXML(file)->assets;
+				selectedFile = file;
+			}
+		}
+		ImGui::EndListBox();
+	}
+
+	void
+	assetSelection()
+	{
+		if (!gameState->assets.empty()) {
+			ImGui::BeginListBox("Asset");
+			for (const auto & asset : gameState->assets) {
+				auto renderable = asset.second.getAs<const Renderable>();
+				if (renderable) {
+					if (ImGui::Selectable(asset.first.c_str(), renderable == selectedAsset)) {
+						selectedAsset = renderable;
+						location = asset.second->createAt(position);
+					}
+				}
+			}
+			ImGui::EndListBox();
+		}
+	}
+
+	void
+	content(const SceneShader & sceneShader, const Frustum & frustum) const override
+	{
+		gameState->terrain->render(sceneShader, frustum);
+		if (selectedAsset) {
+			selectedAsset->render(sceneShader, frustum);
+		}
+	}
+
+	void
+	lights(const SceneShader & sceneShader) const override
+	{
+		if (selectedAsset) {
+			selectedAsset->lights(sceneShader);
+		}
+	}
+
+	void
+	shadows(const ShadowMapper & mapper, const Frustum & frustum) const override
+	{
+		gameState->terrain->shadows(mapper, frustum);
+		if (selectedAsset) {
+			selectedAsset->shadows(mapper, frustum);
+		}
+	}
+
+	std::span<char * const> fileList;
+	char * selectedFile {};
+	const Renderable * selectedAsset {};
+	Location position {.pos = {0, 0, TERRAIN_HEIGHT}, .rot = {}};
+	std::any location;
+	Angle cameraAngle {0.F};
+	RelativeDistance cameraDistance {DEFAULT_CAMERA_DIST};
+	GlobalDistance cameraHeight {DEFAULT_CAMERA_HEIGHT};
+	GlobalDistance cameraFocus {DEFAULT_CAMERA_FOCUS};
+	float autoRotate {0.F};
+};
 
 int
 main(int argc, char ** argv)
@@ -17,7 +169,8 @@ main(int argc, char ** argv)
 		void
 		run(std::span<char * const> fileList)
 		{
-			windows.create<MainWindow>(DEFAULT_WINDOW_SIZE, "ILT - Resource Viewer");
+			windows.create<MainWindow>(DEFAULT_WINDOW_SIZE, "ILT - Resource Viewer")
+					->setContent<ViewerContent>(fileList);
 			mainLoop();
 		}
 	};
-- 
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