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Nuklear/demo/nanovg.c

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/*
Copyright (c) 2015
vurtun <polygone@gmx.net>
MIT licence
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#ifdef _WIN32
#include <windows.h>
#endif
#include <GL/glew.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <SDL2/SDL.h>
#define NANOVG_GLES2_IMPLEMENTATION
#include "nanovg/nanovg.h"
#include "nanovg/nanovg_gl.h"
#include "nanovg/nanovg_gl_utils.h"
/* macros */
#define DTIME 16
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) < (b) ? (b) : (a))
#define CLAMP(i,v,x) (MAX(MIN(v,x), i))
#define LEN(a) (sizeof(a)/sizeof(a)[0])
#define UNUSED(a) ((void)(a))
#include "../gui.h"
static void
clipboard_set(const char *text)
{SDL_SetClipboardText(text);}
static gui_bool
clipboard_is_filled(void)
{return SDL_HasClipboardText();}
static const char*
clipboard_get(void)
{return SDL_GetClipboardText();}
#include "demo.c"
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 gui_size
font_get_width(gui_handle handle, const gui_char *text, gui_size len)
{
gui_size width;
float bounds[4];
NVGcontext *ctx = (NVGcontext*)handle.ptr;
nvgTextBounds(ctx, 0, 0, text, &text[len], bounds);
width = (gui_size)(bounds[2] - bounds[0]);
return width;
}
static void
draw(NVGcontext *nvg, struct gui_command_queue *queue, int width, int height)
{
const struct gui_command *cmd;
glPushAttrib(GL_ENABLE_BIT|GL_COLOR_BUFFER_BIT);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
glEnable(GL_TEXTURE_2D);
nvgBeginFrame(nvg, width, height, ((float)width/(float)height));
gui_foreach_command(cmd, queue) {
switch (cmd->type) {
case GUI_COMMAND_NOP: break;
case GUI_COMMAND_SCISSOR: {
const struct gui_command_scissor *s = gui_command(scissor, cmd);
nvgScissor(nvg, s->x, s->y, s->w, s->h);
} break;
case GUI_COMMAND_LINE: {
const struct gui_command_line *l = gui_command(line, cmd);
nvgBeginPath(nvg);
nvgMoveTo(nvg, l->begin.x, l->begin.y);
nvgLineTo(nvg, l->end.x, l->end.y);
nvgFillColor(nvg, nvgRGBA(l->color.r, l->color.g, l->color.b, l->color.a));
nvgFill(nvg);
} break;
case GUI_COMMAND_CURVE: {
const struct gui_command_curve *q = gui_command(curve, cmd);
nvgBeginPath(nvg);
nvgMoveTo(nvg, q->begin.x, q->begin.y);
nvgBezierTo(nvg, q->ctrl[0].x, q->ctrl[0].y, q->ctrl[1].x, q->ctrl[1].y, q->end.x, q->end.y);
nvgStrokeColor(nvg, nvgRGBA(q->color.r, q->color.g, q->color.b, q->color.a));
nvgStroke(nvg);
} break;
case GUI_COMMAND_RECT: {
const struct gui_command_rect *r = gui_command(rect, cmd);
nvgBeginPath(nvg);
nvgRoundedRect(nvg, r->x, r->y, r->w, r->h, r->rounding);
nvgFillColor(nvg, nvgRGBA(r->color.r, r->color.g, r->color.b, r->color.a));
nvgFill(nvg);
} break;
case GUI_COMMAND_CIRCLE: {
const struct gui_command_circle *c = gui_command(circle, cmd);
nvgBeginPath(nvg);
nvgCircle(nvg, c->x + (c->w/2.0f), c->y + c->w/2.0f, c->w/2.0f);
nvgFillColor(nvg, nvgRGBA(c->color.r, c->color.g, c->color.b, c->color.a));
nvgFill(nvg);
} break;
case GUI_COMMAND_TRIANGLE: {
const struct gui_command_triangle *t = gui_command(triangle, cmd);
nvgBeginPath(nvg);
nvgMoveTo(nvg, t->a.x, t->a.y);
nvgLineTo(nvg, t->b.x, t->b.y);
nvgLineTo(nvg, t->c.x, t->c.y);
nvgLineTo(nvg, t->a.x, t->a.y);
nvgFillColor(nvg, nvgRGBA(t->color.r, t->color.g, t->color.b, t->color.a));
nvgFill(nvg);
} break;
case GUI_COMMAND_TEXT: {
const struct gui_command_text *t = gui_command(text, cmd);
nvgBeginPath(nvg);
nvgRoundedRect(nvg, t->x, t->y, t->w, t->h, 0);
nvgFillColor(nvg, nvgRGBA(t->background.r, t->background.g,
t->background.b, t->background.a));
nvgFill(nvg);
nvgBeginPath(nvg);
nvgFillColor(nvg, nvgRGBA(t->foreground.r, t->foreground.g,
t->foreground.b, t->foreground.a));
nvgTextAlign(nvg, NVG_ALIGN_MIDDLE);
nvgText(nvg, t->x, t->y + t->h * 0.5f, t->string, &t->string[t->length]);
nvgFill(nvg);
} break;
case GUI_COMMAND_IMAGE: {
const struct gui_command_image *i = gui_command(image, cmd);
NVGpaint imgpaint;
imgpaint = nvgImagePattern(nvg, i->x, i->y, i->w, i->h, 0, i->img.handle.id, 1.0f);
nvgBeginPath(nvg);
nvgRoundedRect(nvg, i->x, i->y, i->w, i->h, 0);
nvgFillPaint(nvg, imgpaint);
nvgFill(nvg);
} break;
case GUI_COMMAND_MAX:
default: break;
}
}
gui_command_queue_clear(queue);
nvgResetScissor(nvg);
nvgEndFrame(nvg);
glPopAttrib();
}
static void
key(struct gui_input *in, SDL_Event *evt, gui_bool down)
{
const Uint8* state = SDL_GetKeyboardState(NULL);
SDL_Keycode sym = evt->key.keysym.sym;
if (sym == SDLK_RSHIFT || sym == SDLK_LSHIFT)
gui_input_key(in, GUI_KEY_SHIFT, down);
else if (sym == SDLK_DELETE)
gui_input_key(in, GUI_KEY_DEL, down);
else if (sym == SDLK_RETURN)
gui_input_key(in, GUI_KEY_ENTER, down);
else if (sym == SDLK_SPACE)
gui_input_key(in, GUI_KEY_SPACE, down);
else if (sym == SDLK_BACKSPACE)
gui_input_key(in, GUI_KEY_BACKSPACE, down);
else if (sym == SDLK_LEFT)
gui_input_key(in, GUI_KEY_LEFT, down);
else if (sym == SDLK_RIGHT)
gui_input_key(in, GUI_KEY_RIGHT, down);
else if (sym == SDLK_c)
gui_input_key(in, GUI_KEY_COPY, down && state[SDL_SCANCODE_LCTRL]);
else if (sym == SDLK_v)
gui_input_key(in, GUI_KEY_PASTE, down && state[SDL_SCANCODE_LCTRL]);
else if (sym == SDLK_x)
gui_input_key(in, GUI_KEY_CUT, down && state[SDL_SCANCODE_LCTRL]);
}
static void
motion(struct gui_input *in, SDL_Event *evt)
{
const gui_int x = evt->motion.x;
const gui_int y = evt->motion.y;
gui_input_motion(in, x, y);
}
static void
btn(struct gui_input *in, SDL_Event *evt, gui_bool down)
{
const gui_int x = evt->button.x;
const gui_int y = evt->button.y;
if (evt->button.button == SDL_BUTTON_LEFT)
gui_input_button(in, GUI_BUTTON_LEFT, x, y, down);
else if (evt->button.button == SDL_BUTTON_LEFT)
gui_input_button(in, GUI_BUTTON_RIGHT, x, y, down);
}
static void
text(struct gui_input *in, SDL_Event *evt)
{
gui_glyph glyph;
memcpy(glyph, evt->text.text, GUI_UTF_SIZE);
gui_input_glyph(in, glyph);
}
static void
resize(SDL_Event *evt)
{
if (evt->window.event != SDL_WINDOWEVENT_RESIZED) return;
glViewport(0, 0, evt->window.data1, evt->window.data2);
}
int
main(int argc, char *argv[])
{
/* Platform */
int width, height;
const char *font_path;
gui_size font_height;
SDL_Window *win;
SDL_GLContext glContext;
NVGcontext *vg = NULL;
unsigned int started;
unsigned int dt;
/* GUI */
struct demo_gui gui;
if (argc < 2) {
fprintf(stdout,"Missing TTF Font file argument: gui <path>\n");
exit(EXIT_FAILURE);
}
font_path = argv[1];
font_height = 10;
/* SDL */
SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER|SDL_INIT_EVENTS);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
win = SDL_CreateWindow("Demo",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN);
glContext = SDL_GL_CreateContext(win);
SDL_GetWindowSize(win, &width, &height);
/* OpenGL */
glewExperimental = 1;
if (glewInit() != GLEW_OK)
die("[GLEW] failed setup\n");
glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
/* nanovg */
vg = nvgCreateGLES2(NVG_ANTIALIAS|NVG_DEBUG);
if (!vg) die("[NVG]: failed to init\n");
nvgCreateFont(vg, "fixed", font_path);
nvgFontFace(vg, "fixed");
nvgFontSize(vg, font_height);
nvgTextAlign(vg, NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
/* GUI */
memset(&gui, 0, sizeof gui);
gui_buffer_init_fixed(&gui.memory, calloc(MAX_MEMORY, 1), MAX_MEMORY);
gui.font.userdata.ptr = vg;
gui.font.width = font_get_width;
nvgTextMetrics(vg, NULL, NULL, &gui.font.height);
init_demo(&gui);
while (gui.running) {
/* Input */
SDL_Event evt;
started = SDL_GetTicks();
gui_input_begin(&gui.input);
while (SDL_PollEvent(&evt)) {
if (evt.type == SDL_WINDOWEVENT) resize(&evt);
else if (evt.type == SDL_QUIT) goto cleanup;
else if (evt.type == SDL_KEYUP) key(&gui.input, &evt, gui_false);
else if (evt.type == SDL_KEYDOWN) key(&gui.input, &evt, gui_true);
else if (evt.type == SDL_MOUSEBUTTONDOWN) btn(&gui.input, &evt, gui_true);
else if (evt.type == SDL_MOUSEBUTTONUP) btn(&gui.input, &evt, gui_false);
else if (evt.type == SDL_MOUSEMOTION) motion(&gui.input, &evt);
else if (evt.type == SDL_TEXTINPUT) text(&gui.input, &evt);
else if (evt.type == SDL_MOUSEWHEEL)
gui_input_scroll(&gui.input,(float)evt.wheel.y);
}
gui_input_end(&gui.input);
/* GUI */
SDL_GetWindowSize(win, &width, &height);
run_demo(&gui);
/* Draw */
glClearColor(0.4f, 0.4f, 0.4f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
draw(vg, &gui.queue, width, height);
SDL_GL_SwapWindow(win);
/* Timing */
dt = SDL_GetTicks() - started;
if (dt < DTIME)
SDL_Delay(DTIME - dt);
}
cleanup:
/* Cleanup */
free(gui_buffer_memory(&gui.memory));
nvgDeleteGLES2(vg);
SDL_GL_DeleteContext(glContext);
SDL_DestroyWindow(win);
SDL_Quit();
return 0;
}
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