[DRAFT] SDL3_renderer and SDL_gpu support

demo/sdl3_renderer/.gitignore

@@ -0,0 +1,2 @@
+SDL
+build

demo/sdl3_renderer/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.16)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIGURATION>")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIGURATION>")
+set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}" CACHE INTERNAL "")
+
+# CMAKE Modules
+set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+project(nuklear_sdl3_renderer)
+
+set(EXECUTABLE_NAME ${PROJECT_NAME})
+
+# The SDL java code is hardcoded to load libmain.so on android, so we need to change EXECUTABLE_NAME
+if (ANDROID)
+	set(EXECUTABLE_NAME main)
+	add_library(${EXECUTABLE_NAME} SHARED)
+else()
+	add_executable(${EXECUTABLE_NAME})
+endif()
+
+# Add your sources to the target
+target_sources(${EXECUTABLE_NAME} PRIVATE main.c)
+
+find_package(SDL3 REQUIRED)
+
+# TODO: remove libm and fallback on Nuklear floor()
+target_link_libraries(${EXECUTABLE_NAME} PUBLIC SDL3::SDL3 m)
+
+# Nuklear Include Directory
+target_include_directories(${EXECUTABLE_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../..)
+
+# on Visual Studio, set our app as the default project
+set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT "${EXECUTABLE_NAME}")

demo/sdl3_renderer/cmake/FindSDL3.cmake

@@ -0,0 +1,8 @@
+include(FetchContent)
+FetchContent_Declare(
+    SDL3
+    GIT_REPOSITORY  https://github.com/libsdl-org/SDL.git
+    GIT_TAG         release-3.2.2
+    GIT_SHALLOW     TRUE
+)
+FetchContent_MakeAvailable(SDL3)

demo/sdl3_renderer/main.c

@@ -0,0 +1,245 @@
+/* nuklear - public domain */
+#include <stdio.h>
+#include <stddef.h> /* offsetof TODO: sdl2_renderer didn't need this header? */
+
+#define SDL_MAIN_USE_CALLBACKS
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_STANDARD_IO
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_IMPLEMENTATION
+#define NK_SDL3_RENDERER_IMPLEMENTATION
+#define NK_INCLUDE_STANDARD_BOOL
+#include "nuklear.h"
+#include "nuklear_sdl3_renderer.h"
+
+#define WINDOW_WIDTH 1200
+#define WINDOW_HEIGHT 800
+
+/* ===============================================================
+ *
+ *                          EXAMPLE
+ *
+ * ===============================================================*/
+/* This are some code examples to provide a small overview of what can be
+ * done with this library. To try out an example uncomment the defines */
+/*#define INCLUDE_ALL */
+/*#define INCLUDE_STYLE */
+/*#define INCLUDE_CALCULATOR */
+/*#define INCLUDE_CANVAS */
+#define INCLUDE_OVERVIEW
+/*#define INCLUDE_CONFIGURATOR */
+/*#define INCLUDE_NODE_EDITOR */
+
+#define INCLUDE_ALL
+
+#ifdef INCLUDE_ALL
+    #define INCLUDE_STYLE
+    #define INCLUDE_CALCULATOR
+    #define INCLUDE_CANVAS
+    #define INCLUDE_OVERVIEW
+    /* #define INCLUDE_CONFIGURATOR */
+    #define INCLUDE_NODE_EDITOR
+#endif
+
+#ifdef INCLUDE_STYLE
+    #include "../../demo/common/style.c"
+#endif
+#ifdef INCLUDE_CALCULATOR
+    #include "../../demo/common/calculator.c"
+#endif
+#ifdef INCLUDE_CANVAS
+    #include "../../demo/common/canvas.c"
+#endif
+#ifdef INCLUDE_OVERVIEW
+    #include "../../demo/common/overview.c"
+#endif
+/*
+#ifdef INCLUDE_CONFIGURATOR
+    #include "../../demo/common/style_configurator.c"
+#endif
+*/
+#ifdef INCLUDE_NODE_EDITOR
+    #include "../../demo/common/node_editor.c"
+#endif
+
+/* ===============================================================
+ *
+ *                          DEMO
+ *
+ * ===============================================================*/
+
+typedef struct AppContext {
+    SDL_Window* window;
+    SDL_Renderer* renderer;
+} AppContext;
+
+struct nk_context * ctx;
+struct nk_colorf bg;
+
+SDL_AppResult SDL_Fail(){
+    SDL_LogError(SDL_LOG_CATEGORY_CUSTOM, "Error %s", SDL_GetError());
+    return SDL_APP_FAILURE;
+}
+
+SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS)) {
+        return SDL_Fail();
+    }
+
+    AppContext* appContext = (AppContext*)SDL_malloc(sizeof(AppContext));
+    if (appContext == NULL) {
+        return SDL_Fail();
+    }
+
+    if (!SDL_CreateWindowAndRenderer("Nuklear: SDL3 Renderer", WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_RESIZABLE, &appContext->window, &appContext->renderer)) {
+        SDL_free(appContext);
+        return SDL_Fail();
+    }
+
+    SDL_StartTextInput(appContext->window);
+
+    bg.r = 0.10f, bg.g = 0.18f, bg.b = 0.24f, bg.a = 1.0f;
+
+    *appstate = appContext;
+
+    float font_scale = 1;
+
+    {
+        int render_w, render_h;
+        int window_w, window_h;
+        float scale_x, scale_y;
+        SDL_GetCurrentRenderOutputSize(appContext->renderer, &render_w, &render_h);
+        SDL_GetWindowSize(appContext->window, &window_w, &window_h);
+        scale_x = (float)(render_w) / (float)(window_w);
+        scale_y = (float)(render_h) / (float)(window_h);
+        SDL_SetRenderScale(appContext->renderer, scale_x, scale_y);
+        font_scale = scale_y;
+    }
+
+    ctx = nk_sdl_init(appContext->window, appContext->renderer);
+
+    {
+        struct nk_font_atlas *atlas;
+        struct nk_font_config config = nk_font_config(0);
+        struct nk_font *font;
+
+        /* set up the font atlas and add desired font; note that font sizes are
+         * multiplied by font_scale to produce better results at higher DPIs */
+        nk_sdl_font_stash_begin(&atlas);
+        font = nk_font_atlas_add_default(atlas, 13 * font_scale, &config);
+        /*font = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14 * font_scale, &config);*/
+        /*font = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 16 * font_scale, &config);*/
+        /*font = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13 * font_scale, &config);*/
+        /*font = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12 * font_scale, &config);*/
+        /*font = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10 * font_scale, &config);*/
+        /*font = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13 * font_scale, &config);*/
+        nk_sdl_font_stash_end();
+
+        /* this hack makes the font appear to be scaled down to the desired
+         * size and is only necessary when font_scale > 1 */
+        font->handle.height /= font_scale;
+        /*nk_style_load_all_cursors(ctx, atlas->cursors);*/
+        nk_style_set_font(ctx, &font->handle);
+    }
+
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event* event) {
+    AppContext* app = (AppContext*)appstate;
+
+    switch (event->type) {
+        case SDL_EVENT_QUIT:
+            return SDL_APP_SUCCESS;
+    }
+
+    nk_sdl_handle_event(event);
+
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppIterate(void *appstate) {
+    nk_input_end(ctx);
+    AppContext* app = (AppContext*)appstate;
+
+    /* GUI */
+    if (nk_begin(ctx, "Demo", nk_rect(50, 50, 230, 250),
+        NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
+        NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
+    {
+        enum {EASY, HARD};
+        static int op = EASY;
+        static int property = 20;
+
+        nk_layout_row_static(ctx, 30, 80, 1);
+        if (nk_button_label(ctx, "button"))
+            printf("button pressed\n");
+        nk_layout_row_dynamic(ctx, 30, 2);
+        if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
+        if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
+        nk_layout_row_dynamic(ctx, 25, 1);
+        nk_property_int(ctx, "Compression:", 0, &property, 1000, 1, 1);
+
+        nk_layout_row_dynamic(ctx, 20, 1);
+        nk_label(ctx, "background:", NK_TEXT_LEFT);
+        nk_layout_row_dynamic(ctx, 25, 1);
+        if (nk_combo_begin_color(ctx, nk_rgb_cf(bg), nk_vec2(nk_widget_width(ctx),400))) {
+            nk_layout_row_dynamic(ctx, 120, 1);
+            bg = nk_color_picker(ctx, bg, NK_RGBA);
+            nk_layout_row_dynamic(ctx, 25, 1);
+            bg.r = nk_propertyf(ctx, "#R:", 0, bg.r, 1.0f, 0.01f,0.005f);
+            bg.g = nk_propertyf(ctx, "#G:", 0, bg.g, 1.0f, 0.01f,0.005f);
+            bg.b = nk_propertyf(ctx, "#B:", 0, bg.b, 1.0f, 0.01f,0.005f);
+            bg.a = nk_propertyf(ctx, "#A:", 0, bg.a, 1.0f, 0.01f,0.005f);
+            nk_combo_end(ctx);
+        }
+    }
+    nk_end(ctx);
+
+    /* -------------- EXAMPLES ---------------- */
+    #ifdef INCLUDE_CALCULATOR
+        calculator(ctx);
+    #endif
+    #ifdef INCLUDE_CANVAS
+    canvas(ctx);
+    #endif
+    #ifdef INCLUDE_OVERVIEW
+        overview(ctx);
+    #endif
+    #ifdef INCLUDE_CONFIGURATOR
+        style_configurator(ctx, color_table);
+    #endif
+    #ifdef INCLUDE_NODE_EDITOR
+        node_editor(ctx);
+    #endif
+    /* ----------------------------------------- */
+
+    SDL_SetRenderDrawColor(app->renderer, 255, 0, 255, SDL_ALPHA_OPAQUE);
+    SDL_RenderClear(app->renderer);
+
+    nk_sdl_render(NK_ANTI_ALIASING_ON);
+
+    SDL_RenderPresent(app->renderer);
+
+    nk_input_begin(ctx);
+    return SDL_APP_CONTINUE;
+}
+
+void SDL_AppQuit(void* appstate, SDL_AppResult result) {
+    AppContext* app = (AppContext*)appstate;
+
+    if (app) {
+        SDL_DestroyRenderer(app->renderer);
+        SDL_DestroyWindow(app->window);
+        SDL_free(app);
+    }
+
+    SDL_Quit();
+}