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Merge pull request #534 from DeXP/gles2 

OpenGL ES2.0: Emscripten support
This commit is contained in:
Micha Mettke 2017-10-17 12:23:56 +02:00 committed by GitHub
parent a75bfcc3cb e57e0149f3
commit 056af25e27
2 changed files with 100 additions and 96 deletions
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13
demo/sdl_opengles2/Makefile
View File

@ -9,12 +9,17 @@ OBJ = $(SRC:.c=.o)
UNAME_S := $(shell uname -s)
ifeq ($(UNAME_S),Darwin)
LIBS = -lSDL2 -framework OpenGLES -lm -lGLEW
LIBS = -lSDL2 -framework OpenGLES -lm
else
LIBS = -lSDL2 -lGLESv2 -lm -lGLU -lGLEW
LIBS = -lSDL2 -lGLESv2 -lm
endif
$(BIN):
$(BIN): prepare
$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) $(LIBS)
web: prepare
emcc $(SRC) -Os -s USE_SDL=2 -o bin/index.html
prepare:
@mkdir -p bin
rm -f bin/$(BIN) $(OBJS)
$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) $(LIBS)

183
demo/sdl_opengles2/main.c
View File

@ -10,10 +10,6 @@
#include <limits.h>
#include <time.h>
#include <GL/glew.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengles2.h>
#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_STANDARD_VARARGS
@ -55,19 +51,96 @@
* DEMO
*
* ===============================================================*/
/* Platform */
SDL_Window *win;
int running = nk_true;
void
MainLoop(void* loopArg){
struct nk_context *ctx = (struct nk_context *)loopArg;
/* Input */
SDL_Event evt;
nk_input_begin(ctx);
while (SDL_PollEvent(&evt)) {
if (evt.type == SDL_QUIT) running = nk_false;
nk_sdl_handle_event(&evt);
}
nk_input_end(ctx);
/* GUI */
if (nk_begin(ctx, "Demo", nk_rect(50, 50, 200, 200),
NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
{
nk_menubar_begin(ctx);
nk_layout_row_begin(ctx, NK_STATIC, 25, 2);
nk_layout_row_push(ctx, 45);
if (nk_menu_begin_label(ctx, "FILE", NK_TEXT_LEFT, nk_vec2(120, 200))) {
nk_layout_row_dynamic(ctx, 30, 1);
nk_menu_item_label(ctx, "OPEN", NK_TEXT_LEFT);
nk_menu_item_label(ctx, "CLOSE", NK_TEXT_LEFT);
nk_menu_end(ctx);
}
nk_layout_row_push(ctx, 45);
if (nk_menu_begin_label(ctx, "EDIT", NK_TEXT_LEFT, nk_vec2(120, 200))) {
nk_layout_row_dynamic(ctx, 30, 1);
nk_menu_item_label(ctx, "COPY", NK_TEXT_LEFT);
nk_menu_item_label(ctx, "CUT", NK_TEXT_LEFT);
nk_menu_item_label(ctx, "PASTE", NK_TEXT_LEFT);
nk_menu_end(ctx);
}
nk_layout_row_end(ctx);
nk_menubar_end(ctx);
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_end(ctx);
/* -------------- EXAMPLES ---------------- */
/*calculator(ctx);*/
/*overview(ctx);*/
/*node_editor(ctx);*/
/* ----------------------------------------- */
/* Draw */
{float bg[4];
int win_width, win_height;
nk_color_fv(bg, nk_rgb(28,48,62));
SDL_GetWindowSize(win, &win_width, &win_height);
glViewport(0, 0, win_width, win_height);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(bg[0], bg[1], bg[2], bg[3]);
/* IMPORTANT: `nk_sdl_render` modifies some global OpenGL state
* with blending, scissor, face culling, depth test and viewport and
* defaults everything back into a default state.
* Make sure to either a.) save and restore or b.) reset your own state after
* rendering the UI. */
nk_sdl_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_MEMORY, MAX_ELEMENT_MEMORY);
SDL_GL_SwapWindow(win);}
}
int
main(int argc, char* argv[])
{
/* Platform */
SDL_Window *win;
SDL_GLContext glContext;
struct nk_color background;
int win_width, win_height;
int running = 1;
/* GUI */
struct nk_context *ctx;
SDL_GLContext glContext;
/* SDL setup */
SDL_SetHint(SDL_HINT_VIDEO_HIGHDPI_DISABLED, "0");
/*SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER|SDL_INIT_EVENTS); // - do NOT init SDL on GL ES 2 */
@ -80,15 +153,9 @@ main(int argc, char* argv[])
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
glContext = SDL_GL_CreateContext(win);
SDL_GetWindowSize(win, &win_width, &win_height);
/* OpenGL setup */
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 */
@ -111,81 +178,13 @@ main(int argc, char* argv[])
/*set_style(ctx, THEME_BLUE);*/
/*set_style(ctx, THEME_DARK);*/
background = nk_rgb(28,48,62);
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);
#if defined(__EMSCRIPTEN__)
#include <emscripten.h>
emscripten_set_main_loop_arg(MainLoop, (void*)ctx, 0, nk_true);
#else
while (running) MainLoop((void*)ctx);
#endif
/* GUI */
if (nk_begin(ctx, "Demo", nk_rect(50, 50, 200, 200),
NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
{
nk_menubar_begin(ctx);
nk_layout_row_begin(ctx, NK_STATIC, 25, 2);
nk_layout_row_push(ctx, 45);
if (nk_menu_begin_label(ctx, "FILE", NK_TEXT_LEFT, nk_vec2(120, 200))) {
nk_layout_row_dynamic(ctx, 30, 1);
nk_menu_item_label(ctx, "OPEN", NK_TEXT_LEFT);
nk_menu_item_label(ctx, "CLOSE", NK_TEXT_LEFT);
nk_menu_end(ctx);
}
nk_layout_row_push(ctx, 45);
if (nk_menu_begin_label(ctx, "EDIT", NK_TEXT_LEFT, nk_vec2(120, 200))) {
nk_layout_row_dynamic(ctx, 30, 1);
nk_menu_item_label(ctx, "COPY", NK_TEXT_LEFT);
nk_menu_item_label(ctx, "CUT", NK_TEXT_LEFT);
nk_menu_item_label(ctx, "PASTE", NK_TEXT_LEFT);
nk_menu_end(ctx);
}
nk_layout_row_end(ctx);
nk_menubar_end(ctx);
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_end(ctx);
/* -------------- EXAMPLES ---------------- */
/*calculator(ctx);*/
/*overview(ctx);*/
/*node_editor(ctx);*/
/* ----------------------------------------- */
/* Draw */
{float bg[4];
nk_color_fv(bg, background);
SDL_GetWindowSize(win, &win_width, &win_height);
glViewport(0, 0, win_width, win_height);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(bg[0], bg[1], bg[2], bg[3]);
/* IMPORTANT: `nk_sdl_render` modifies some global OpenGL state
* with blending, scissor, face culling, depth test and viewport and
* defaults everything back into a default state.
* Make sure to either a.) save and restore or b.) reset your own state after
* rendering the UI. */
nk_sdl_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_MEMORY, MAX_ELEMENT_MEMORY);
SDL_GL_SwapWindow(win);}
}
cleanup:
nk_sdl_shutdown();
SDL_GL_DeleteContext(glContext);
SDL_DestroyWindow(win);