Basic Scene Format and Editor Tool

CMakeLists.txt

@@ -9,6 +9,7 @@ project(plush
 # options
 
 option(PLUSH_BUILD_EXAMPLES "Build Plush Examples" ON)
+option(PLUSH_BUILD_EDITOR "Build Plush Editor" ON)
 option(PLUSH_USE_ASAN "Use Address Sanitizer" OFF)
 set(PLUSH_MAX_LIGHTS "32" CACHE STRING "Maximum number of lights in a single render pass")
 set(PLUSH_MAX_TRIANGLES "16384" CACHE STRING "Maximum number of triangles in a single render pass")
@@ -77,6 +78,17 @@ endif()
 
 target_link_libraries(plush PUBLIC $<$<BOOL:${PLUSH_USE_ASAN}>:ASAN::ASAN>)
 
+# editor
+
+if(PLUSH_BUILD_EDITOR)
+	find_package(SDL3 CONFIG COMPONENTS SDL3)
+	if(SDL3_FOUND)
+		add_subdirectory(editor)
+	else()
+		message(WARNING "SDL3 not found, cannot build editor")
+	endif()
+endif()
+
 # examples
 
 if(PLUSH_BUILD_EXAMPLES)

editor/CMakeLists.txt

@@ -0,0 +1,33 @@
+project(plush-editor LANGUAGES C CXX)
+
+include(FetchContent)
+
+FetchContent_Declare(
+	imgui
+	GIT_REPOSITORY https://github.com/ocornut/imgui.git
+	GIT_TAG v1.92.3
+)
+
+FetchContent_MakeAvailable(imgui)
+
+add_library(imgui STATIC
+	${imgui_SOURCE_DIR}/imgui_demo.cpp
+	${imgui_SOURCE_DIR}/imgui_draw.cpp
+	${imgui_SOURCE_DIR}/imgui_tables.cpp
+	${imgui_SOURCE_DIR}/imgui_widgets.cpp
+	${imgui_SOURCE_DIR}/imgui.cpp
+	${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
+	${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
+)
+
+target_include_directories(imgui PUBLIC
+	${imgui_SOURCE_DIR}
+	${imgui_SOURCE_DIR}/backends
+)
+
+add_executable(plush-editor)
+target_sources(plush-editor PRIVATE
+	${PROJECT_SOURCE_DIR}/main.cpp
+)
+
+target_link_libraries(plush-editor PUBLIC plush SDL3::SDL3 imgui)

editor/main.cpp

@@ -0,0 +1,196 @@
+
+#include <vector>
+#include <string>
+#include <cstdlib>
+#include <stdexcept>
+
+#include <SDL3/SDL.h>
+#include <plush/plush.h>
+
+#include "imgui.h"
+#include "imgui_impl_sdl3.h"
+#include "imgui_impl_sdlrenderer3.h"
+
+#define SDL_MAIN_USE_CALLBACKS 1
+#include <SDL3/SDL_main.h>
+
+static void quit()
+{
+	SDL_Event event;
+	event.quit.type = SDL_EVENT_QUIT;
+	event.quit.timestamp = SDL_GetTicksNS();
+	SDL_PushEvent(&event);
+}
+
+static SDL_AppResult die(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	SDL_LogMessageV(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_CRITICAL, fmt, ap);
+	va_end(ap);
+
+	SDL_Event event;
+	event.quit.type = SDL_EVENT_QUIT;
+	event.quit.timestamp = SDL_GetTicksNS();
+	SDL_PushEvent(&event);
+
+	return SDL_APP_FAILURE;
+}
+
+class app_t {
+public:
+	void EditorMain()
+	{
+		// setup flags
+		ImGuiWindowFlags window_flags = ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar |
+			ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
+
+		// setup size
+		int screen_w, screen_h;
+		SDL_GetRenderOutputSize(renderer, &screen_w, &screen_h);
+		ImGui::SetNextWindowSize(ImVec2(screen_w, screen_h), ImGuiCond_Always);
+		ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_Always);
+
+		// do it
+		if (ImGui::Begin("Main Menu", nullptr, window_flags))
+		{
+			// main menu bar
+			if (ImGui::BeginMenuBar())
+			{
+				if (ImGui::BeginMenu("File"))
+				{
+					if (ImGui::MenuItem("Load"))
+						;
+
+					if (ImGui::MenuItem("Save", "Ctrl+S"))
+						;
+
+					if (ImGui::MenuItem("Save As"))
+						;
+
+					if (ImGui::MenuItem("Quit", "Alt+F4"))
+						quit();
+
+					ImGui::EndMenu();
+				}
+
+				ImGui::EndMenuBar();
+			}
+
+			ImGui::End();
+		}
+
+		ImGui::ShowDemoWindow(nullptr);
+	}
+
+	SDL_AppResult Iterate()
+	{
+		ImGui_ImplSDLRenderer3_NewFrame();
+		ImGui_ImplSDL3_NewFrame();
+		ImGui::NewFrame();
+
+		EditorMain();
+
+		ImGui::Render();
+		ImGuiIO &io = ImGui::GetIO();
+		SDL_SetRenderScale(renderer, io.DisplayFramebufferScale.x, io.DisplayFramebufferScale.y);
+		SDL_SetRenderDrawColorFloat(renderer, clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+		SDL_RenderClear(renderer);
+		ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(), renderer);
+		SDL_RenderPresent(renderer);
+
+		return SDL_APP_CONTINUE;
+	}
+
+	SDL_AppResult Event(SDL_Event *event)
+	{
+		if ((event->type == SDL_EVENT_QUIT) || (event->type == SDL_EVENT_WINDOW_CLOSE_REQUESTED && event->window.windowID == SDL_GetWindowID(window)))
+			return SDL_APP_SUCCESS;
+
+		ImGui_ImplSDL3_ProcessEvent(event);
+
+		return SDL_APP_CONTINUE;
+	}
+
+	app_t(const char *title, int w=1280, int h=720) : windowTitle(title), windowWidth(w), windowHeight(h)
+	{
+		if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD))
+			throw std::runtime_error(SDL_GetError());
+
+		if (!SDL_CreateWindowAndRenderer(windowTitle.c_str(), windowWidth, windowHeight, SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN | SDL_WINDOW_MAXIMIZED, &window, &renderer))
+			throw std::runtime_error(SDL_GetError());
+
+		IMGUI_CHECKVERSION();
+		ImGui::CreateContext();
+		ImGuiIO &io = ImGui::GetIO();
+		io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+		io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+		io.IniFilename = nullptr;
+		io.LogFilename = nullptr;
+
+		ImGui::StyleColorsDark();
+
+		ImGui_ImplSDL3_InitForSDLRenderer(window, renderer);
+		ImGui_ImplSDLRenderer3_Init(renderer);
+
+		SDL_ShowWindow(window);
+	}
+
+	~app_t()
+	{
+		ImGui_ImplSDLRenderer3_Shutdown();
+		ImGui_ImplSDL3_Shutdown();
+		ImGui::DestroyContext();
+
+		if (renderer) SDL_DestroyRenderer(renderer);
+		if (window) SDL_DestroyWindow(window);
+
+		SDL_Quit();
+	}
+private:
+	// SDL video state
+	SDL_Window *window;
+	SDL_Renderer *renderer;
+
+	int windowWidth;
+	int windowHeight;
+	std::string windowTitle;
+
+	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+};
+
+SDLMAIN_DECLSPEC SDL_AppResult SDLCALL SDL_AppInit(void **appstate, SDL_UNUSED int argc, SDL_UNUSED char *argv[])
+{
+	app_t *app = NULL;
+
+	try {
+		app = new app_t("Plush Scene Editor");
+	} catch (const std::runtime_error &error) {
+		return die("%s", error.what());
+	}
+
+	*appstate = reinterpret_cast<void*>(app);
+
+	return SDL_APP_CONTINUE;
+}
+
+SDLMAIN_DECLSPEC SDL_AppResult SDLCALL SDL_AppIterate(void *appstate)
+{
+	app_t *app = reinterpret_cast<app_t*>(appstate);
+
+	return app->Iterate();
+}
+
+SDLMAIN_DECLSPEC SDL_AppResult SDLCALL SDL_AppEvent(void *appstate, SDL_Event *event)
+{
+	app_t *app = reinterpret_cast<app_t*>(appstate);
+
+	return app->Event(event);
+}
+
+SDLMAIN_DECLSPEC void SDLCALL SDL_AppQuit(void *appstate, SDL_UNUSED SDL_AppResult result)
+{
+	app_t *app = reinterpret_cast<app_t*>(appstate);
+
+	delete app;
+}

editor/scenefmt.txt

@@ -0,0 +1,54 @@
+Namespace = "Plush";
+Name = "Test Scene";
+DefaultCamera = 0;
+
+// palette 0
+palette
+{
+	FirstColor = 0;
+	LastColor = 255;
+	File = "palette.pcx";
+}
+
+// camera 0
+camera
+{
+	Width = 640;
+	Height = 480;
+	Fov = 90;
+	zBuffer = true;
+
+	Origin = [64, 64, -384];
+	Angles = [15, 10, 0];
+
+	Palette = 0;
+}
+
+// material 0
+material
+{
+	Name = "Fallback Material";
+	Fallback = true;
+
+	Ambient = [44, 8, 8];
+	Diffuse = [156, 25, 25];
+	Specular = [185, 159, 159];
+}
+
+// mesh 0
+mesh
+{
+	Name = "Polyrobo";
+
+	File = "polyrobo.obj";
+
+	Material = 0;
+}
+
+// object 0
+object
+{
+	Name = "Polyrobo";
+
+	Mesh = 0;
+}