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mii_emu/nuklear/mii_emu.c
Michel Pollet 3ee2a36d38 mish: Removed globals. 
Removed big horrible global used by mish commands, now use the parameter
made for it.

Signed-off-by: Michel Pollet <buserror@gmail.com>
2023-10-28 06:29:41 +01:00

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/*
* mii_emu.c
*
* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
*
* SPDX-License-Identifier: MIT
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <time.h>
#include <limits.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_BUTTON_TRIGGER_ON_RELEASE
#include "nuklear.h"
#define NK_XLIB_GL3_IMPLEMENTATION
#define NK_XLIB_LOAD_OPENGL_EXTENSIONS
#include "nuklear_xlib_gl3.h"
#include "mii.h"
#include "mish.h"
#define WINDOW_WIDTH 1280
#define WINDOW_HEIGHT 720 // (10 + (192) * 3)
#define MAX_VERTEX_BUFFER 512 * 1024
#define MAX_ELEMENT_BUFFER 128 * 1024
void
mii_nuklear(
mii_t *mii,
struct nk_context *ctx);
void
mii_nuklear_init(
mii_t *mii,
struct nk_context *ctx);
/* ===============================================================
*
* DEMO
*
* ===============================================================*/
struct XWindow {
Display *dpy;
Window win;
XVisualInfo *vis;
Colormap cmap;
XSetWindowAttributes swa;
XWindowAttributes attr;
GLXFBConfig fbc;
Atom wm_delete_window;
int width, height;
};
static int gl_err = nk_false;
static int gl_error_handler(Display *dpy, XErrorEvent *ev)
{NK_UNUSED(dpy); NK_UNUSED(ev); gl_err = nk_true;return 0;}
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputs("\n", stderr);
exit(EXIT_FAILURE);
}
static int
has_extension(const char *string, const char *ext)
{
const char *start, *where, *term;
where = strchr(ext, ' ');
if (where || *ext == '\0')
return nk_false;
for (start = string;;) {
where = strstr((const char*)start, ext);
if (!where) break;
term = where + strlen(ext);
if (where == start || *(where - 1) == ' ') {
if (*term == ' ' || *term == '\0')
return nk_true;
}
start = term;
}
return nk_false;
}
struct nk_font *nk_main_font = NULL;
/* global now, mish commands use it */
mii_t g_mii = {};
int
main(
int argc,
const char *argv[])
{
/* Platform */
int running = 1;
struct XWindow win;
GLXContext glContext;
struct nk_context *ctx;
struct nk_colorf bg;
mii_init(&g_mii);
int idx = 1;
uint32_t flags = MII_INIT_DEFAULT;
int r = mii_argv_parse(&g_mii, argc, argv, &idx, &flags);
if (r == 0) {
printf("mii: Invalid argument %s, skipped\n", argv[idx]);
} else if (r == -1)
exit(1);
mii_prepare(&g_mii, flags);
mish_prepare(1);
mish_set_command_parameter(MISH_FCC('m','i','i',' '), &g_mii);
printf("MISH_TELNET_PORT = %s\n", getenv("MISH_TELNET_PORT"));
memset(&win, 0, sizeof(win));
win.dpy = XOpenDisplay(NULL);
if (!win.dpy) die("Failed to open X display\n");
{
/* check glx version */
int glx_major, glx_minor;
if (!glXQueryVersion(win.dpy, &glx_major, &glx_minor))
die("[X11]: Error: Failed to query OpenGL version\n");
if ((glx_major == 1 && glx_minor < 3) || (glx_major < 1))
die("[X11]: Error: Invalid GLX version!\n");
}
{
/* find and pick matching framebuffer visual */
int fb_count;
static GLint attr[] = {
GLX_X_RENDERABLE, True,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
GLX_DOUBLEBUFFER, True,
None
};
GLXFBConfig *fbc;
fbc = glXChooseFBConfig(win.dpy, DefaultScreen(win.dpy), attr, &fb_count);
if (!fbc) die("[X11]: Error: failed to retrieve framebuffer configuration\n");
{
/* pick framebuffer with most samples per pixel */
int i;
int fb_best = -1, best_num_samples = -1;
for (i = 0; i < fb_count; ++i) {
XVisualInfo *vi = glXGetVisualFromFBConfig(win.dpy, fbc[i]);
if (vi) {
int sample_buffer, samples;
glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLE_BUFFERS, &sample_buffer);
glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLES, &samples);
if ((fb_best < 0) || (sample_buffer && samples > best_num_samples))
fb_best = i, best_num_samples = samples;
XFree(vi);
}
}
win.fbc = fbc[fb_best];
XFree(fbc);
win.vis = glXGetVisualFromFBConfig(win.dpy, win.fbc);
}
}
{
/* create window */
win.cmap = XCreateColormap(win.dpy, RootWindow(win.dpy, win.vis->screen), win.vis->visual, AllocNone);
win.swa.colormap = win.cmap;
win.swa.background_pixmap = None;
win.swa.border_pixel = 0;
win.swa.event_mask =
ExposureMask | KeyPressMask | KeyReleaseMask |
ButtonPress | ButtonReleaseMask| ButtonMotionMask |
Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
PointerMotionMask| StructureNotifyMask;
win.win = XCreateWindow(win.dpy, RootWindow(win.dpy, win.vis->screen), 0, 0,
WINDOW_WIDTH, WINDOW_HEIGHT, 0, win.vis->depth, InputOutput,
win.vis->visual, CWBorderPixel|CWColormap|CWEventMask, &win.swa);
if (!win.win) die("[X11]: Failed to create window\n");
XFree(win.vis);
char title[128];
sprintf(title, "MII //e Emulator");
char *telnet = getenv("MISH_TELNET_PORT");
if (telnet)
sprintf(title + strlen(title), " (telnet port %s)", telnet);
else
sprintf(title + strlen(title), " (telnet disabled)");
XStoreName(win.dpy, win.win, title);
XMapWindow(win.dpy, win.win);
win.wm_delete_window = XInternAtom(win.dpy, "WM_DELETE_WINDOW", False);
XSetWMProtocols(win.dpy, win.win, &win.wm_delete_window, 1);
}
{
/* create opengl context */
typedef GLXContext(*glxCreateContext)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
int(*old_handler)(Display*, XErrorEvent*) = XSetErrorHandler(gl_error_handler);
const char *extensions_str = glXQueryExtensionsString(win.dpy, DefaultScreen(win.dpy));
glxCreateContext create_context = (glxCreateContext)
glXGetProcAddressARB((const GLubyte*)"glXCreateContextAttribsARB");
gl_err = nk_false;
if (!has_extension(extensions_str, "GLX_ARB_create_context") || !create_context) {
fprintf(stdout, "[X11]: glXCreateContextAttribARB() not found...\n");
fprintf(stdout, "[X11]: ... using old-style GLX context\n");
glContext = glXCreateNewContext(win.dpy, win.fbc, GLX_RGBA_TYPE, 0, True);
} else {
GLint attr[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 0,
None
};
glContext = create_context(win.dpy, win.fbc, 0, True, attr);
XSync(win.dpy, False);
if (gl_err || !glContext) {
/* Could not create GL 3.0 context. Fallback to old 2.x context.
* If a version below 3.0 is requested, implementations will
* return the newest context version compatible with OpenGL
* version less than version 3.0.*/
attr[1] = 1; attr[3] = 0;
gl_err = nk_false;
fprintf(stdout, "[X11] Failed to create OpenGL 3.0 context\n");
fprintf(stdout, "[X11] ... using old-style GLX context!\n");
glContext = create_context(win.dpy, win.fbc, 0, True, attr);
}
}
XSync(win.dpy, False);
XSetErrorHandler(old_handler);
if (gl_err || !glContext)
die("[X11]: Failed to create an OpenGL context\n");
glXMakeCurrent(win.dpy, win.win, glContext);
}
//extern const unsigned char mii_proggy_data[];
//extern const unsigned int mii_proggy_size;
extern const unsigned char mii_droid_data[];
extern const unsigned int mii_droid_size;
ctx = nk_x11_init(win.dpy, win.win);
/* Load Fonts: if none of these are loaded a default font will be used */
{
struct nk_font_atlas *atlas;
nk_x11_font_stash_begin(&atlas);
struct nk_font_config cfg = nk_font_config(0);
#if 0
nk_rune ranges[] = {
0x0020, 0x007E, /* Ascii */
0x00A1, 0x00FF, /* Symbols + Umlaute */
0
};
#endif
cfg.range = nk_font_default_glyph_ranges();
cfg.oversample_h = cfg.oversample_v = 1;
cfg.pixel_snap = true;
nk_main_font = nk_font_atlas_add_from_memory(atlas,
(void*)mii_droid_data, mii_droid_size, 20, &cfg);
nk_x11_font_stash_end();
/*nk_style_load_all_cursors(ctx, atlas->cursors);*/
if (nk_main_font)
nk_style_set_font(ctx, &nk_main_font->handle);
}
mii_nuklear_init(&g_mii, ctx);
bg.r = 0.0f; bg.g = 0.0f; bg.b = 0.0f; bg.a = 1.0f;
// bg.r = 0.8f; bg.g = 0.8f; bg.b = 0.8f; bg.a = 1.0f;
while (running) {
/* Input */
XEvent evt;
nk_input_begin(ctx);
while (XPending(win.dpy)) {
XNextEvent(win.dpy, &evt);
if (evt.type == ClientMessage) goto cleanup;
if (XFilterEvent(&evt, win.win)) continue;
nk_x11_handle_event(&evt);
}
nk_input_end(ctx);
/* GUI */
mii_nuklear(&g_mii, ctx);
/* Draw */
XGetWindowAttributes(win.dpy, win.win, &win.attr);
glViewport(0, 0, win.width, win.height);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(bg.r, bg.g, bg.b, bg.a);
/* IMPORTANT: `nk_x11_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_x11_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
glXSwapBuffers(win.dpy, win.win);
}
mii_dispose(&g_mii);
cleanup:
nk_x11_shutdown();
glXMakeCurrent(win.dpy, 0, 0);
glXDestroyContext(win.dpy, glContext);
XUnmapWindow(win.dpy, win.win);
XFreeColormap(win.dpy, win.cmap);
XDestroyWindow(win.dpy, win.win);
XCloseDisplay(win.dpy);
return 0;
}
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