add: demo/sdl3_renderer

Apply 825.diff from:
Immediate-Mode-UI#825
which adds updated backend for SDL3 Renderer
Hopefully, it will work just fine (untested)
Big thanks to github.com/suboyar

Author: sleeptightAnsiC

demo/sdl3_renderer/Makefile

@@ -0,0 +1,27 @@
+# Install
+BIN = demo
+
+# Flags
+CFLAGS += -std=c89 -Wall -Wextra -pedantic -O2 -DSDL_DISABLE_IMMINTRIN_H
+
+SRC = main.c
+OBJ = $(SRC:.c=.o)
+
+ifeq ($(OS),Windows_NT)
+#TODO
+#BIN := $(BIN).exe
+#LIBS = -lmingw32 -lSDL3main -lSDL3 -lopengl32 -lm -lGLU32
+else
+	UNAME_S := $(shell uname -s)
+	ifeq ($(UNAME_S),Darwin)
+#TODO		LIBS = -lSDL3 -framework OpenGL -lm
+	else
+		CFLAGS += $(shell pkg-config --cflags sdl3)
+		LIBS += -lm -ldl -lSDL3
+	endif
+endif
+
+$(BIN):
+	@mkdir -p bin
+	rm -f bin/$(BIN) $(OBJS)
+	$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) $(LIBS)

demo/sdl3_renderer/main.c

@@ -0,0 +1,265 @@
+/* nuklear - 1.32.0 - public domain */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+#include <limits.h>
+#include <time.h>
+
+#include <SDL3/SDL.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_SDL_RENDERER_IMPLEMENTATION
+#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 */
+
+#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
+ *
+ * ===============================================================*/
+int
+main(void)
+{
+    /* Platform */
+    SDL_Window *win;
+    SDL_PropertiesID win_props;
+    SDL_Renderer *renderer;
+    SDL_PropertiesID renderer_props;
+    int running = 1;
+    float font_scale = 1;
+
+    /* GUI */
+    struct nk_context *ctx;
+    struct nk_colorf bg;
+
+#ifdef INCLUDE_CONFIGURATOR
+    static struct nk_color color_table[NK_COLOR_COUNT];
+    memcpy(color_table, nk_default_color_style, sizeof(color_table));
+#endif
+
+    /* SDL setup */
+    SDL_Init(SDL_INIT_VIDEO);
+
+    win_props = SDL_CreateProperties();
+    if(win_props == 0) {
+        SDL_Log("Unable to create window properties: %s", SDL_GetError());
+        return 0;
+    }
+
+    SDL_SetStringProperty(win_props, SDL_PROP_WINDOW_CREATE_TITLE_STRING, "Demo");
+    SDL_SetNumberProperty(win_props, SDL_PROP_WINDOW_CREATE_WIDTH_NUMBER, WINDOW_WIDTH);
+    SDL_SetNumberProperty(win_props, SDL_PROP_WINDOW_CREATE_HEIGHT_NUMBER, WINDOW_HEIGHT);
+    SDL_SetNumberProperty(win_props, SDL_PROP_WINDOW_CREATE_X_NUMBER, SDL_WINDOWPOS_CENTERED);
+    SDL_SetNumberProperty(win_props, SDL_PROP_WINDOW_CREATE_Y_NUMBER, SDL_WINDOWPOS_CENTERED);
+    SDL_SetBooleanProperty(win_props, SDL_PROP_WINDOW_CREATE_HIGH_PIXEL_DENSITY_BOOLEAN, true);
+
+    win = SDL_CreateWindowWithProperties(win_props);
+    if (win == NULL) {
+        SDL_Log("Error SDL_CreateWindow %s", SDL_GetError());
+        exit(-1);
+    }
+
+    renderer_props = SDL_CreateProperties();
+    if(win_props == 0) {
+        SDL_Log("Unable to create renderer properties: %s", SDL_GetError());
+        return 0;
+    }
+
+    SDL_SetPointerProperty(renderer_props, SDL_PROP_RENDERER_CREATE_WINDOW_POINTER, win);
+    SDL_SetNumberProperty(renderer_props, SDL_PROP_RENDERER_CREATE_PRESENT_VSYNC_NUMBER, 1);
+
+    /* TODO: Figure out if this still makes sense for SDL3. */
+#if 0
+    SDL_SetHint(SDL_HINT_RENDER_BATCHING, "1");
+    SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software");
+    SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengl");
+    SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software");
+    SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengles2");
+#endif
+
+    renderer = SDL_CreateRendererWithProperties(renderer_props); /* SDL_CreateRenderer(win, -1, flags);*/
+    if (renderer == NULL) {
+        SDL_Log("Error SDL_CreateRenderer %s", SDL_GetError());
+        exit(-1);
+    }
+
+    /* scale the renderer output for High-DPI displays */
+    {
+        int render_w, render_h;
+        int window_w, window_h;
+        float scale_x, scale_y;
+        SDL_GetCurrentRenderOutputSize(renderer, &render_w, &render_h);
+        SDL_GetWindowSize(win, &window_w, &window_h);
+        scale_x = (float)(render_w) / (float)(window_w);
+        scale_y = (float)(render_h) / (float)(window_h);
+        SDL_SetRenderScale(renderer, scale_x, scale_y);
+        font_scale = scale_y;
+    }
+
+    /* GUI */
+    ctx = nk_sdl_init(win, renderer);
+    /* Load Fonts: if none of these are loaded a default font will be used  */
+    /* Load Cursor: if you uncomment cursor loading please hide the cursor */
+    {
+        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);
+    }
+
+    bg.r = 0.10f, bg.g = 0.18f, bg.b = 0.24f, bg.a = 1.0f;
+    while (running)
+        {
+            /* Input */
+            SDL_Event evt;
+            nk_input_begin(ctx);
+            while (SDL_PollEvent(&evt)) {
+                if (evt.type == SDL_EVENT_QUIT) goto cleanup;
+                nk_sdl_handle_event(&evt);
+            }
+            nk_sdl_handle_grab(); /* optional grabbing behavior */
+            nk_input_end(ctx);
+
+            /* 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"))
+                        fprintf(stdout, "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, 100, 10, 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(renderer, bg.r * 255, bg.g * 255, bg.b * 255, bg.a * 255);
+            SDL_RenderClear(renderer);
+
+            nk_sdl_render(NK_ANTI_ALIASING_ON);
+
+            SDL_RenderPresent(renderer);
+        }
+
+cleanup:
+    nk_sdl_shutdown();
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyProperties(renderer_props);
+    SDL_DestroyWindow(win);
+    SDL_DestroyProperties(win_props);
+    SDL_Quit();
+    return 0;
+}