Adding backend sources for SDL3, which differs from SDL2 only in some…

… functions/enums naming and a few function arguments

Backends/RmlUi_Backend_SDL3_SDLrenderer.cpp

@@ -0,0 +1,199 @@
+/*
+ * This source file is part of RmlUi, the HTML/CSS Interface Middleware
+ *
+ * For the latest information, see http://github.com/mikke89/RmlUi
+ *
+ * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
+ * Copyright (c) 2019-2023 The RmlUi Team, and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include "RmlUi_Backend.h"
+#include "RmlUi_Platform_SDL.h"
+#include "RmlUi_Renderer_SDL.h"
+#include <RmlUi/Core/Context.h>
+#include <RmlUi/Core/Core.h>
+#include <RmlUi/Core/Log.h>
+#include <SDL.h>
+
+/**
+    Global data used by this backend.
+
+    Lifetime governed by the calls to Backend::Initialize() and Backend::Shutdown().
+ */
+struct BackendData {
+	BackendData(SDL_Renderer* renderer) : render_interface(renderer) {}
+
+	SystemInterface_SDL system_interface;
+	RenderInterface_SDL render_interface;
+
+	SDL_Window* window = nullptr;
+	SDL_Renderer* renderer = nullptr;
+
+	bool running = true;
+};
+static Rml::UniquePtr<BackendData> data;
+
+bool Backend::Initialize(const char* window_name, int width, int height, bool allow_resize)
+{
+	RMLUI_ASSERT(!data);
+
+	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS | SDL_INIT_TIMER) != 0)
+		return false;
+
+	// Submit click events when focusing the window.
+	SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
+
+	const Uint32 window_flags = (allow_resize ? SDL_WINDOW_RESIZABLE : 0);
+	SDL_Window* window = SDL_CreateWindow(window_name, width, height, window_flags);
+	if (!window)
+	{
+		Rml::Log::Message(Rml::Log::LT_ERROR, "SDL error on create window: %s\n", SDL_GetError());
+		return false;
+	}
+
+	/*
+	 * Force a specific back-end
+	SDL_SetHint(SDL_HINT_RENDER_BATCHING, "1");
+	SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software");
+	SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengles2");
+	SDL_SetHint(SDL_HINT_RENDER_DRIVER, "direct3d");
+	SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengl");
+	*/
+
+	SDL_Renderer* renderer = SDL_CreateRenderer(window, nullptr, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+	if (!renderer)
+		return false;
+
+	data = Rml::MakeUnique<BackendData>(renderer);
+
+	data->window = window;
+	data->renderer = renderer;
+
+	data->system_interface.SetWindow(window);
+
+	SDL_RendererInfo renderer_info;
+	if (SDL_GetRendererInfo(renderer, &renderer_info) == 0)
+	{
+		data->system_interface.LogMessage(Rml::Log::LT_INFO, Rml::CreateString(128, "Using SDL renderer: %s\n", renderer_info.name));
+	}
+
+	return true;
+}
+
+void Backend::Shutdown()
+{
+	RMLUI_ASSERT(data);
+
+	SDL_DestroyRenderer(data->renderer);
+	SDL_DestroyWindow(data->window);
+
+	data.reset();
+
+	SDL_Quit();
+}
+
+Rml::SystemInterface* Backend::GetSystemInterface()
+{
+	RMLUI_ASSERT(data);
+	return &data->system_interface;
+}
+
+Rml::RenderInterface* Backend::GetRenderInterface()
+{
+	RMLUI_ASSERT(data);
+	return &data->render_interface;
+}
+
+bool Backend::ProcessEvents(Rml::Context* context, KeyDownCallback key_down_callback, bool power_save)
+{
+	RMLUI_ASSERT(data && context);
+
+	bool result = data->running;
+	SDL_Event ev;
+
+	int has_event = 0;
+	if (power_save)
+		has_event = SDL_WaitEventTimeout(&ev, static_cast<int>(Rml::Math::Min(context->GetNextUpdateDelay(), 10.0) * 1000));
+	else
+		has_event = SDL_PollEvent(&ev);
+	while (has_event)
+	{
+		switch (ev.type)
+		{
+		case SDL_EVENT_QUIT:
+		{
+			result = false;
+		}
+		break;
+		case SDL_EVENT_KEY_DOWN:
+		{
+			const Rml::Input::KeyIdentifier key = RmlSDL::ConvertKey(ev.key.keysym.sym);
+			const int key_modifier = RmlSDL::GetKeyModifierState();
+			const float native_dp_ratio = 1.f;
+
+			// See if we have any global shortcuts that take priority over the context.
+			if (key_down_callback && !key_down_callback(context, key, key_modifier, native_dp_ratio, true))
+				break;
+			// Otherwise, hand the event over to the context by calling the input handler as normal.
+			if (!RmlSDL::InputEventHandler(context, ev))
+				break;
+			// The key was not consumed by the context either, try keyboard shortcuts of lower priority.
+			if (key_down_callback && !key_down_callback(context, key, key_modifier, native_dp_ratio, false))
+				break;
+		}
+		break;
+		default:
+		{
+			RmlSDL::InputEventHandler(context, ev);
+		}
+		break;
+		}
+		has_event = SDL_PollEvent(&ev);
+	}
+
+	return result;
+}
+
+void Backend::RequestExit()
+{
+	RMLUI_ASSERT(data);
+
+	data->running = false;
+}
+
+void Backend::BeginFrame()
+{
+	RMLUI_ASSERT(data);
+
+	SDL_SetRenderDrawColor(data->renderer, 0, 0, 0, 0);
+	SDL_RenderClear(data->renderer);
+
+	data->render_interface.BeginFrame();
+}
+
+void Backend::PresentFrame()
+{
+	RMLUI_ASSERT(data);
+
+	data->render_interface.EndFrame();
+	SDL_RenderPresent(data->renderer);
+}