Non OpenGL SDL2 backend that uses SDL2_gfx

demo/sdl_gfx/Makefile

@@ -0,0 +1,20 @@
+# Install
+BIN = demo
+
+# Flags
+CFLAGS = -std=c99 -pedantic -O2
+
+SRC = main.c
+OBJ = $(SRC:.c=.o)
+
+ifeq ($(OS),Windows_NT)
+BIN := $(BIN).exe
+LIBS = -lmingw32 -lSDLmain -lSDL2 -lSDL2_gfx -lm
+else
+LIBS = -lSDL2 -lSDL2_gfx -lm
+endif
+
+$(BIN):
+	@mkdir -p bin
+	rm -f bin/$(BIN) $(OBJS)
+	$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) $(LIBS)

demo/sdl_gfx/main.c

@@ -0,0 +1,211 @@
+/* nuklear - v4.00 - public domain */
+
+#include <stdarg.h>
+
+/* these defines are both needed for the header
+ * and source file. So if you split them remember
+ * to copy them as well. */
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_INCLUDE_STANDARD_IO
+// #define NK_INCLUDE_FONT_BAKING
+// #define NK_INCLUDE_DEFAULT_FONT
+#define NK_IMPLEMENTATION
+#define NK_SDL_IMPLEMENTATION
+#include "../../nuklear.h"
+#include "nuklear_sdl.h"
+
+#define WINDOW_WIDTH 1200
+#define WINDOW_HEIGHT 800
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+#include <limits.h>
+#include <time.h>
+
+#include <SDL2/SDL.h>
+
+
+/* ===============================================================
+ *
+ *                          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_OVERVIEW
+// #define INCLUDE_NODE_EDITOR
+
+#ifdef INCLUDE_ALL
+  #define INCLUDE_STYLE
+  #define INCLUDE_CALCULATOR
+  #define INCLUDE_OVERVIEW
+  #define INCLUDE_NODE_EDITOR
+#endif
+
+#ifdef INCLUDE_STYLE
+  #include "../style.c"
+#endif
+#ifdef INCLUDE_CALCULATOR
+  #include "../calculator.c"
+#endif
+#ifdef INCLUDE_OVERVIEW
+  #include "../overview.c"
+#endif
+#ifdef INCLUDE_NODE_EDITOR
+  #include "../node_editor.c"
+#endif
+
+int main(void)
+{
+	SDL_Window* window;
+	SDL_Renderer* renderer;
+	struct nk_color background;
+	struct nk_colorf bg;
+	int win_width, win_height;
+	int running = 1;
+	struct nk_context *ctx;
+	/* float bg[4]; */
+
+	/* SDL setup */
+	if (SDL_Init(SDL_INIT_VIDEO) == -1) {
+		printf( "Can't init SDL:  %s\n", SDL_GetError( ) );
+		return 1;
+	}
+
+
+	window = SDL_CreateWindow("SDL2_gfx demo",
+                              SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+                              WINDOW_WIDTH, WINDOW_HEIGHT,
+                              SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
+
+	if (!window) {
+		printf("Can't create window: %s\n", SDL_GetError());
+		return 1;
+	}
+	/* try VSYNC and ACCELERATED */
+	renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
+	if (!renderer) {
+		printf("Can't create renderer: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	if (!(ctx = nk_sdl_init(window, renderer, 1, 1))) {
+		printf("nk_sdl_init() failed!");
+		return 1;
+	}
+
+	/* style.c */
+#ifdef INCLUDE_STYLE
+	// set_style(ctx, THEME_WHITE);
+	// set_style(ctx, THEME_RED);
+	// set_style(ctx, THEME_BLUE);
+	set_style(ctx, THEME_DARK);
+#endif
+
+	background = nk_rgb(28,48,62);
+	bg = nk_color_cf(background);
+	while (running)
+	{
+		/* Input */
+		SDL_Event evt;
+		nk_input_begin(ctx);
+		while (SDL_PollEvent(&evt)) {
+			if (evt.type == SDL_QUIT) goto cleanup;
+			nk_sdl_handle_event(&evt);
+		}
+		nk_input_end(ctx);
+
+		/* GUI */
+		{
+		if (nk_begin(ctx, "Demo", nk_rect(50, 50, 210, 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;
+			static float x_scale = 1;
+			static float y_scale = 1;
+
+
+			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);
+			}}
+
+			// NOTE: scaling looks best at exact integer multiples obviously,
+			// but 0.5 increments is a good compromise between granularity and looks
+			float ratio[] = { 0.6f, 0.2f, 0.2f };
+			nk_layout_row(ctx, NK_DYNAMIC, 0, 3, ratio);
+			nk_label(ctx, "GUI scaling:", NK_TEXT_LEFT);
+			if (nk_button_symbol(ctx, NK_SYMBOL_MINUS)) {
+				x_scale -= 0.5;
+				y_scale -= 0.5;
+				nk_sdl_scale(x_scale, y_scale);
+				SDL_RenderSetScale(renderer, x_scale, y_scale);
+				printf("scale = %.2f %.2f\n", x_scale, y_scale);
+			}
+			if (nk_button_symbol(ctx, NK_SYMBOL_PLUS)) {
+				x_scale += 0.5;
+				y_scale += 0.5;
+				nk_sdl_scale(x_scale, y_scale);
+				SDL_RenderSetScale(renderer, x_scale, y_scale);
+				printf("scale = %.1f %.1f\n", x_scale, y_scale);
+			}
+
+		}
+		nk_end(ctx);}
+
+		/* -------------- EXAMPLES ---------------- */
+#ifdef INCLUDE_CALCULATOR
+		calculator(ctx);
+#endif
+#ifdef INCLUDE_OVERVIEW
+		overview(ctx);
+#endif
+#ifdef INCLUDE_NODE_EDITOR
+		node_editor(ctx);
+#endif
+		/* ----------------------------------------- */
+
+		SDL_Delay(50);
+		/* Draw */
+		background = nk_rgb_cf(bg);
+		nk_sdl_render(&background, SDL_TRUE);
+	}
+
+cleanup:
+	nk_sdl_shutdown();
+	SDL_DestroyRenderer(renderer);
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+	return 0;
+}