Immediate-Mode-UI · ccawley2011 · Feb 17, 2025
diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
@@ -12,7 +12,7 @@ jobs:
     - name: apt-update
       run: sudo apt-get update -qq
     - name: apt get demo-libs
-      run: sudo apt-get install -y --no-install-recommends liballegro5-dev liballegro-image5-dev liballegro-ttf5-dev libglfw3 libglfw3-dev libglew-dev libsdl2-dev libwayland-dev libx11-dev libxft-dev wayland-protocols
+      run: sudo apt-get install -y --no-install-recommends liballegro5-dev liballegro-image5-dev liballegro-ttf5-dev libglfw3 libglfw3-dev libsdl2-dev libwayland-dev libx11-dev libxft-dev wayland-protocols
     - name: build allegro5
       run: make -C demo/allegro5
     - name: build glfw_opengl2

diff --git a/demo/allegro5/Makefile b/demo/allegro5/Makefile
@@ -10,7 +10,7 @@ OBJ = $(SRC:.c=.o)
 # TODO: Handle Windows build
 #ifeq ($(OS),Windows_NT)
 #BIN := $(BIN).exe
-#LIBS = -lglfw3 -lopengl32 -lm -lGLU32 -lGLEW32
+#LIBS = -lglfw3 -lm
 #else
 LIBS = -lallegro -lallegro_main -lallegro_image -lallegro_font \
 	-lallegro_ttf -lallegro_primitives -lm

diff --git a/demo/common/glad.h b/demo/common/glad.h
diff --git a/demo/glfw_opengl2/Makefile b/demo/glfw_opengl2/Makefile
@@ -9,13 +9,13 @@ OBJ = $(SRC:.c=.o)
 
 ifeq ($(OS),Windows_NT)
 BIN := $(BIN).exe
-LIBS = -lglfw3 -lopengl32 -lm -lGLU32
+LIBS = -lglfw3 -lm
 else
 	UNAME_S := $(shell uname -s)
 	ifeq ($(UNAME_S),Darwin)
-		LIBS := -lglfw3 -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo -lm -lGLEW -L/usr/local/lib
+		LIBS := -lglfw3 -framework Cocoa -framework IOKit -framework CoreVideo -lm -L/usr/local/lib
 	else
-		LIBS = -lglfw -lGL -lm -lGLU
+		LIBS = -lglfw -lm
 	endif
 endif
 

diff --git a/demo/glfw_opengl2/main.c b/demo/glfw_opengl2/main.c
@@ -9,6 +9,9 @@
 #include <limits.h>
 #include <time.h>
 
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
+
 #include <GLFW/glfw3.h>
 
 #define NK_INCLUDE_FIXED_TYPES
@@ -115,6 +118,8 @@ int main(void)
     glfwMakeContextCurrent(win);
     glfwGetWindowSize(win, &width, &height);
 
+    gladLoadGL((GLADloadfunc)glfwGetProcAddress);
+
     /* GUI */
     ctx = nk_glfw3_init(win, NK_GLFW3_INSTALL_CALLBACKS);
     /* Load Fonts: if none of these are loaded a default font will be used  */

diff --git a/demo/glfw_opengl3/Makefile b/demo/glfw_opengl3/Makefile
@@ -9,14 +9,14 @@ OBJ = $(SRC:.c=.o)
 
 ifeq ($(OS),Windows_NT)
 BIN := $(BIN).exe
-LIBS = -lglfw3 -lopengl32 -lm -lGLU32 -lGLEW32
+LIBS = -lglfw3 -lm
 else
 	UNAME_S := $(shell uname -s)
 	GLFW3 := $(shell pkg-config --libs glfw3)
 	ifeq ($(UNAME_S),Darwin)
-		LIBS := $(GLFW3) -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo -lm -lGLEW -L/usr/local/lib
+		LIBS := $(GLFW3) -framework Cocoa -framework IOKit -framework CoreVideo -lm -L/usr/local/lib
 	else
-		LIBS = $(GLFW3) -lGL -lm -lGLU -lGLEW
+		LIBS = $(GLFW3) -lm
 	endif
 endif
 

diff --git a/demo/glfw_opengl3/main.c b/demo/glfw_opengl3/main.c
@@ -9,7 +9,9 @@
 #include <limits.h>
 #include <time.h>
 
-#include <GL/glew.h>
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
+
 #include <GLFW/glfw3.h>
 
 #define NK_INCLUDE_FIXED_TYPES
@@ -112,13 +114,10 @@ int main(void)
     glfwMakeContextCurrent(win);
     glfwGetWindowSize(win, &width, &height);
 
+    gladLoadGL((GLADloadfunc)glfwGetProcAddress);
+
     /* OpenGL */
     glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
-    glewExperimental = 1;
-    if (glewInit() != GLEW_OK) {
-        fprintf(stderr, "Failed to setup GLEW\n");
-        exit(1);
-    }
 
     ctx = nk_glfw3_init(&glfw, win, NK_GLFW3_INSTALL_CALLBACKS);
     /* Load Fonts: if none of these are loaded a default font will be used  */

diff --git a/demo/glfw_opengl4/Makefile b/demo/glfw_opengl4/Makefile
@@ -9,14 +9,14 @@ OBJ = $(SRC:.c=.o)
 
 ifeq ($(OS),Windows_NT)
 BIN := $(BIN).exe
-LIBS = -lglfw3 -lopengl32 -lm -lGLU32 -lGLEW32
+LIBS = -lglfw3 -lm
 else
 	UNAME_S := $(shell uname -s)
 	GLFW3 := $(shell pkg-config --libs glfw3)
 	ifeq ($(UNAME_S),Darwin)
-		LIBS := $(GLFW3) -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo -lm -lGLEW -L/usr/local/lib
+		LIBS := $(GLFW3) -framework Cocoa -framework IOKit -framework CoreVideo -lm -L/usr/local/lib
 	else
-		LIBS = $(GLFW3) -lGL -lm -lGLU -lGLEW
+		LIBS = $(GLFW3) -lm
 	endif
 endif
 

diff --git a/demo/glfw_opengl4/main.c b/demo/glfw_opengl4/main.c
@@ -9,7 +9,9 @@
 #include <limits.h>
 #include <time.h>
 
-#include <GL/glew.h>
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
+
 #include <GLFW/glfw3.h>
 
 #define NK_INCLUDE_FIXED_TYPES
@@ -112,13 +114,10 @@ int main(void)
     glfwMakeContextCurrent(win);
     glfwGetWindowSize(win, &width, &height);
 
+    gladLoadGL((GLADloadfunc)glfwGetProcAddress);
+
     /* OpenGL */
     glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
-    glewExperimental = 1;
-    if (glewInit() != GLEW_OK) {
-        fprintf(stderr, "Failed to setup GLEW\n");
-        exit(1);
-    }
 
     ctx = nk_glfw3_init(win, NK_GLFW3_INSTALL_CALLBACKS, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
     /* Load Fonts: if none of these are loaded a default font will be used  */

diff --git a/demo/sdl_opengl2/Makefile b/demo/sdl_opengl2/Makefile
@@ -9,14 +9,9 @@ OBJ = $(SRC:.c=.o)
 
 ifeq ($(OS),Windows_NT)
 BIN := $(BIN).exe
-LIBS = -lmingw32 -lSDL2main -lSDL2 -lopengl32 -lm -lGLU32
+LIBS = -lmingw32 -lSDL2main -lSDL2 -lm
 else
-	UNAME_S := $(shell uname -s)
-	ifeq ($(UNAME_S),Darwin)
-		LIBS = -lSDL2 -framework OpenGL -lm
-	else
-		LIBS = -lSDL2 -lGL -lm -lGLU
-	endif
+	LIBS = -lSDL2 -lm
 endif
 
 $(BIN):

diff --git a/demo/sdl_opengl2/main.c b/demo/sdl_opengl2/main.c
@@ -10,7 +10,9 @@
 #include <time.h>
 
 #include <SDL2/SDL.h>
-#include <SDL2/SDL_opengl.h>
+
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
 
 #define NK_INCLUDE_FIXED_TYPES
 #define NK_INCLUDE_STANDARD_IO
@@ -110,6 +112,8 @@ main(int argc, char *argv[])
     glContext = SDL_GL_CreateContext(win);
     SDL_GetWindowSize(win, &win_width, &win_height);
 
+    gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
+
     /* GUI */
     ctx = nk_sdl_init(win);
     /* Load Fonts: if none of these are loaded a default font will be used  */

diff --git a/demo/sdl_opengl3/Makefile b/demo/sdl_opengl3/Makefile
@@ -9,14 +9,9 @@ OBJ = $(SRC:.c=.o)
 
 ifeq ($(OS),Windows_NT)
 BIN := $(BIN).exe
-LIBS = -lmingw32 -lSDL2main -lSDL2 -lopengl32 -lm -lGLU32 -lGLEW32
+LIBS = -lmingw32 -lSDL2main -lSDL2 -lm
 else
-	UNAME_S := $(shell uname -s)
-	ifeq ($(UNAME_S),Darwin)
-		LIBS = -lSDL2 -framework OpenGL -lm -lGLEW
-	else
-		LIBS = -lSDL2 -lGL -lm -lGLU -lGLEW
-	endif
+	LIBS = -lSDL2 -lm
 endif
 
 $(BIN):

diff --git a/demo/sdl_opengl3/main.c b/demo/sdl_opengl3/main.c
@@ -9,9 +9,10 @@
 #include <limits.h>
 #include <time.h>
 
-#include <GL/glew.h>
 #include <SDL2/SDL.h>
-#include <SDL2/SDL_opengl.h>
+
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
 
 #define NK_INCLUDE_FIXED_TYPES
 #define NK_INCLUDE_STANDARD_IO
@@ -113,13 +114,8 @@ int main(int argc, char *argv[])
     glContext = SDL_GL_CreateContext(win);
     SDL_GetWindowSize(win, &win_width, &win_height);
 
-    /* OpenGL setup */
+    gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
     glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
-    glewExperimental = 1;
-    if (glewInit() != GLEW_OK) {
-        fprintf(stderr, "Failed to setup GLEW\n");
-        exit(1);
-    }
 
     ctx = nk_sdl_init(win);
     /* Load Fonts: if none of these are loaded a default font will be used  */

diff --git a/demo/sdl_opengl3/nuklear_sdl_gl3.h b/demo/sdl_opengl3/nuklear_sdl_gl3.h
@@ -14,7 +14,6 @@
 #define NK_SDL_GL3_H_
 
 #include <SDL2/SDL.h>
-#include <SDL2/SDL_opengl.h>
 
 NK_API struct nk_context*   nk_sdl_init(SDL_Window *win);
 NK_API void                 nk_sdl_font_stash_begin(struct nk_font_atlas **atlas);

diff --git a/demo/sdl_opengles2/Makefile b/demo/sdl_opengles2/Makefile
@@ -7,12 +7,7 @@ CFLAGS += -std=c89 -Wall -Wextra -pedantic -DSDL_DISABLE_IMMINTRIN_H
 SRC = main.c
 OBJ = $(SRC:.c=.o)
 
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Darwin)
-	LIBS = -lSDL2 -framework OpenGLES -lm
-else
-	LIBS = -lSDL2 -lGLESv2 -lm
-endif
+LIBS = -lSDL2 -lm
 
 $(BIN): prepare
 	$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) $(LIBS)

diff --git a/demo/sdl_opengles2/main.c b/demo/sdl_opengles2/main.c
@@ -9,6 +9,9 @@
 #include <limits.h>
 #include <time.h>
 
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
+
 #define NK_INCLUDE_FIXED_TYPES
 #define NK_INCLUDE_STANDARD_IO
 #define NK_INCLUDE_STANDARD_VARARGS
@@ -203,6 +206,8 @@ int main(int argc, char* argv[])
         WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
     glContext = SDL_GL_CreateContext(win);
 
+    gladLoadGLES2((GLADloadfunc)SDL_GL_GetProcAddress);
+
     /* OpenGL setup */
     glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
 

diff --git a/demo/sdl_opengles2/nuklear_sdl_gles2.h b/demo/sdl_opengles2/nuklear_sdl_gles2.h
@@ -16,7 +16,6 @@
 #define NK_SDL_GLES2_H_
 
 #include <SDL2/SDL.h>
-#include <SDL2/SDL_opengles2.h>
 
 
 NK_API struct nk_context*   nk_sdl_init(SDL_Window *win);

diff --git a/demo/sdl_renderer/Makefile b/demo/sdl_renderer/Makefile
@@ -11,11 +11,11 @@ OBJ = $(SRC:.c=.o)
 ifeq ($(OS),Windows_NT)
 #TODO
 #BIN := $(BIN).exe
-#LIBS = -lmingw32 -lSDL2main -lSDL2 -lopengl32 -lm -lGLU32
+#LIBS = -lmingw32 -lSDL2main -lSDL2 -lm
 else
 	UNAME_S := $(shell uname -s)
 	ifeq ($(UNAME_S),Darwin)
-#TODO		LIBS = -lSDL2 -framework OpenGL -lm
+#TODO		LIBS = -lSDL2 -lm
 	else
 		LIBS += -lm -ldl `sdl2-config --libs`
 	endif

diff --git a/demo/sfml_opengl2/Makefile b/demo/sfml_opengl2/Makefile
@@ -13,16 +13,16 @@ ifeq ($(OS),Windows_NT)
 	SFML_DIR = C:/Users/Ricky/MinGW-Libs/SFML
 
 	BIN := $(BIN).exe
-	LIBS = -lmingw32 -DSFML_STATIC -lsfml-window-s -lsfml-system-s -lopengl32 -lwinmm -lgdi32
+	LIBS = -lmingw32 -DSFML_STATIC -lsfml-window-s -lsfml-system-s -lwinmm -lgdi32
 else
 	# Edit the line below to point to your SFML folder on Linux/MacOS
 	SFML_DIR = /home/ricky/Libraries/SFML
 
 	UNAME_S := $(shell uname -s)
 	ifeq ($(UNAME_S),Darwin)
-		LIBS = -lsfml-window -lsfml-system -pthread -framework OpenGL
+		LIBS = -lsfml-window -lsfml-system -pthread
 	else
-		LIBS = -DSFML_STATIC -lsfml-window-s -lsfml-system-s -pthread -ludev -lGL -lX11 -lXrandr
+		LIBS = -DSFML_STATIC -lsfml-window-s -lsfml-system-s -pthread -ludev -lX11 -lXrandr
 	endif
 endif
 

diff --git a/demo/sfml_opengl2/main.cpp b/demo/sfml_opengl2/main.cpp
@@ -9,7 +9,9 @@
 #include <limits.h>
 #include <time.h>
 
-#include <SFML/OpenGL.hpp>
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
+
 #include <SFML/Window.hpp>
 
 #define NK_INCLUDE_FIXED_TYPES
@@ -82,6 +84,9 @@ int main(void)
     sf::Window win(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "Demo", sf::Style::Default, settings);
     win.setVerticalSyncEnabled(true);
     win.setActive(true);
+
+    gladLoadGL(sf::Context::getFunction);
+
     glViewport(0, 0, win.getSize().x, win.getSize().y);
 
     /* GUI */

diff --git a/demo/sfml_opengl3/Makefile b/demo/sfml_opengl3/Makefile
@@ -9,29 +9,25 @@ SRC = main.cpp
 OBJ = $(SRC:.cpp=.o)
 
 ifeq ($(OS),Windows_NT)
-	# Edit the line below to point to your SFML/GLAD folder on Windows
+	# Edit the line below to point to your SFML folder on Windows
 	SFML_DIR = C:/Users/Ricky/MinGW-Libs/SFML
-	GLAD_DIR = C:/Users/Ricky/MinGW-Libs/GLAD
 
 	BIN := $(BIN).exe
-	LIBS = -lmingw32 -DSFML_STATIC -lsfml-window-s -lsfml-system-s -lopengl32 -lwinmm -lgdi32
+	LIBS = -lmingw32 -DSFML_STATIC -lsfml-window-s -lsfml-system-s -lwinmm -lgdi32
 else
-	# Edit the line below to point to your SFML/GLAD folder on Linux/MacOS
+	# Edit the line below to point to your SFML folder on Linux/MacOS
 	SFML_DIR = /home/ricky/Libraries/SFML
-	GLAD_DIR = /home/ricky/Libraries/GLAD
 
 	UNAME_S := $(shell uname -s)
 	ifeq ($(UNAME_S),Darwin)
-		LIBS = -lsfml-window -lsfml-system -pthread -framework OpenGL
+		LIBS = -lsfml-window -lsfml-system -pthread
 	else
-		LIBS = -DSFML_STATIC -lsfml-window-s -lsfml-system-s -pthread -ludev -lGL -lX11 -lXrandr
+		LIBS = -DSFML_STATIC -lsfml-window-s -lsfml-system-s -pthread -ludev -lX11 -lXrandr
 	endif
 endif
 
 SFML_INC = -I $(SFML_DIR)/include
 SFML_LIB = -L $(SFML_DIR)/lib
-GLAD_INC = -I $(GLAD_DIR)/include
-GLAD_SRC = $(GLAD_DIR)/src/glad.c
 
 $(BIN):
-	$(CC) $(GLAD_SRC) $(SRC) $(CFLAGS) $(GLAD_INC) $(SFML_INC) $(SFML_LIB) $(SFML_EXT) -o $(BIN) $(LIBS)
+	$(CC) $(SRC) $(CFLAGS) $(SFML_INC) $(SFML_LIB) $(SFML_EXT) -o $(BIN) $(LIBS)
diff --git a/demo/sfml_opengl3/Readme.md b/demo/sfml_opengl3/Readme.md
diff --git a/demo/sfml_opengl3/main.cpp b/demo/sfml_opengl3/main.cpp
@@ -9,6 +9,9 @@
 #include <limits.h>
 #include <time.h>
 
+#define GLAD_GL_IMPLEMENTATION
+#include "../common/glad.h"
+
 #include <SFML/Window.hpp>
 
 #define NK_INCLUDE_FIXED_TYPES
@@ -84,10 +87,9 @@ int main(void)
     sf::Window win(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "Demo", sf::Style::Default, settings);
     win.setVerticalSyncEnabled(true);
     win.setActive(true);
-    if(!gladLoadGL()) { /* Load OpenGL extensions */
-        printf("Failed to load OpenGL extensions!\n");
-        return -1;
-    }
+
+    gladLoadGL(sf::Context::getFunction);
+
     glViewport(0, 0, win.getSize().x, win.getSize().y);
 
     /* GUI */