Qt: Initial shader editor support

include/panda_qt/main_window.hpp

@@ -19,6 +19,7 @@
 #include "panda_qt/config_window.hpp"
 #include "panda_qt/patch_window.hpp"
 #include "panda_qt/screen.hpp"
+#include "panda_qt/shader_editor.hpp"
 #include "panda_qt/text_editor.hpp"
 #include "services/hid.hpp"
 
@@ -48,6 +49,7 @@ class MainWindow : public QMainWindow {
 		EditCheat,
 		PressTouchscreen,
 		ReleaseTouchscreen,
+		ReloadUbershader,
 	};
 
 	// Tagged union representing our message queue messages
@@ -99,6 +101,7 @@ class MainWindow : public QMainWindow {
 	CheatsWindow* cheatsEditor;
 	TextEditorWindow* luaEditor;
 	PatchWindow* patchWindow;
+	ShaderEditorWindow* shaderEditor;
 
 	// We use SDL's game controller API since it's the sanest API that supports as many controllers as possible
 	SDL_GameController* gameController = nullptr;
@@ -110,9 +113,6 @@ class MainWindow : public QMainWindow {
 	void selectROM();
 	void dumpDspFirmware();
 	void dumpRomFS();
-	void openLuaEditor();
-	void openCheatsEditor();
-	void openPatchWindow();
 	void showAboutMenu();
 	void initControllers();
 	void pollControllers();
@@ -139,5 +139,6 @@ class MainWindow : public QMainWindow {
 	void mouseReleaseEvent(QMouseEvent* event) override;
 
 	void loadLuaScript(const std::string& code);
+	void reloadShader(const std::string& shader);
 	void editCheat(u32 handle, const std::vector<uint8_t>& cheat, const std::function<void(u32)>& callback);
 };

include/panda_qt/shader_editor.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <QApplication>
+#include <QDialog>
+#include <QWidget>
+#include <string>
+
+#include "zep.h"
+#include "zep/mode_repl.h"
+#include "zep/regress.h"
+
+class ShaderEditorWindow : public QDialog {
+	Q_OBJECT
+
+  private:
+	Zep::ZepWidget_Qt zepWidget;
+	Zep::IZepReplProvider replProvider;
+	static constexpr float fontSize = 14.0f;
+
+	// Whether this backend supports shader editor
+	bool shaderEditorSupported = true;
+
+  public:
+	ShaderEditorWindow(QWidget* parent, const std::string& filename, const std::string& initialText);
+	void setText(const std::string& text) { zepWidget.GetEditor().GetMRUBuffer()->SetText(text); }
+
+	void setEnable(bool enable);
+};

include/renderer.hpp

@@ -1,6 +1,7 @@
 #pragma once
 #include <array>
 #include <span>
+#include <string>
 #include <optional>
 
 #include "PICA/pica_vertex.hpp"
@@ -66,6 +67,13 @@ class Renderer {
 	// This function does things like write back or cache necessary state before we delete our context
 	virtual void deinitGraphicsContext() = 0;
 
+	// Functions for hooking up the renderer core to the frontend's shader editor for editing ubershaders in real time
+	// SupportsShaderReload: Indicates whether the backend offers ubershader reload support or not
+	// GetUbershader/SetUbershader: Gets or sets the renderer's current ubershader
+	virtual bool supportsShaderReload() { return false; }
+	virtual std::string getUbershader() { return ""; }
+	virtual void setUbershader(const std::string& shader) {}
+
 	// Functions for initializing the graphics context for the Qt frontend, where we don't have the convenience of SDL_Window
 #ifdef PANDA3DS_FRONTEND_QT
 	virtual void initGraphicsContext(GL::Context* context) { Helpers::panic("Tried to initialize incompatible renderer with GL context"); }

include/renderer_gl/renderer_gl.hpp

@@ -82,7 +82,11 @@ class RendererGL final : public Renderer {
 	void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) override;
 	void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) override;             // Draw the given vertices
 	void deinitGraphicsContext() override;
-	
+
+	virtual bool supportsShaderReload() override { return true; }
+	virtual std::string getUbershader() override;
+	virtual void setUbershader(const std::string& shader) override;
+
 	std::optional<ColourBuffer> getColourBuffer(u32 addr, PICA::ColorFmt format, u32 width, u32 height, bool createIfnotFound = true);
 
 	// Note: The caller is responsible for deleting the currently bound FBO before calling this