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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))
#define GUI_USE_FIXED_TYPES
#define GUI_ASSERT(expr) assert(expr)
#include "../gui.h"
/*#include "demo.c"*/
#include "maya.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_text(NVGcontext *ctx, float x, float y, const gui_byte *c,
const gui_char *string, gui_size len)
{
gui_float height = 0;
nvgBeginPath(ctx);
nvgTextMetrics(ctx, NULL, NULL, &height);
nvgFillColor(ctx, nvgRGBA(c[0], c[1], c[2], c[3]));
nvgText(ctx, x, y + height, string, &string[len]);
nvgFill(ctx);
}
static void
draw_line(NVGcontext *ctx, float x0, float y0, float x1, float y1, const gui_byte *c)
{
nvgBeginPath(ctx);
nvgMoveTo(ctx, x0, y0);
nvgLineTo(ctx, x1, y1);
nvgFillColor(ctx, nvgRGBA(c[0], c[1], c[2], c[3]));
nvgFill(ctx);
}
static void
draw_rect(NVGcontext *ctx, float x, float y, float w, float h, float r, const gui_byte* c)
{
nvgBeginPath(ctx);
nvgRoundedRect(ctx, x, y, w, h, r);
nvgFillColor(ctx, nvgRGBA(c[0], c[1], c[2], c[3]));
nvgFill(ctx);
}
static void
draw_circle(NVGcontext *ctx, float x, float y, float r, const gui_byte *c)
{
nvgBeginPath(ctx);
nvgCircle(ctx, x + r, y + r, r);
nvgFillColor(ctx, nvgRGBA(c[0], c[1], c[2], c[3]));
nvgFill(ctx);
}
static void
draw_triangle(NVGcontext *ctx, float x0, float y0, float x1, float y1,
float x2, float y2, const gui_byte *c)
{
nvgBeginPath(ctx);
nvgMoveTo(ctx, x0, y0);
nvgLineTo(ctx, x1, y1);
nvgLineTo(ctx, x2, y2);
nvgLineTo(ctx, x0, y0);
nvgFillColor(ctx, nvgRGBA(c[0], c[1], c[2], c[3]));
nvgFill(ctx);
}
static void
draw_image(NVGcontext *ctx, gui_handle img, float x, float y, float w, float h, float r)
{
NVGpaint imgpaint;
imgpaint = nvgImagePattern(ctx, x, y, w, h, 0, img.id, 1.0f);
nvgBeginPath(ctx);
nvgRoundedRect(ctx, x, y, w, h, r);
nvgFillPaint(ctx, imgpaint);
nvgFill(ctx);
}
static void
execute(NVGcontext *nvg, struct gui_command_buffer *list, 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, list) {
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);
draw_line(nvg, l->begin[0], l->begin[1], l->end[0], l->end[1], l->color);
} break;
case GUI_COMMAND_RECT: {
const struct gui_command_rect *r = gui_command(rect, cmd);
draw_rect(nvg, r->x, r->y, r->w, r->h, r->r, r->color);
} break;
case GUI_COMMAND_CIRCLE: {
const struct gui_command_circle *c = gui_command(circle, cmd);
draw_circle(nvg, c->x, c->y, (float)c->w / 2.0f, c->color);
} break;
case GUI_COMMAND_TRIANGLE: {
const struct gui_command_triangle *t = gui_command(triangle, cmd);
draw_triangle(nvg, t->a[0], t->a[1], t->b[0], t->b[1], t->c[0], t->c[1], t->color);
} break;
case GUI_COMMAND_TEXT: {
const struct gui_command_text *t = gui_command(text, cmd);
draw_text(nvg, t->x, t->y, t->fg, t->string, t->length);
} break;
case GUI_COMMAND_IMAGE: {
const struct gui_command_image *i = gui_command(image, cmd);
draw_image(nvg, i->img.handle, i->x, i->y, i->w, i->h, 1);
} break;
case GUI_COMMAND_MAX:
default: break;
}
}
nvgResetScissor(nvg);
nvgEndFrame(nvg);
glPopAttrib();
}
static void
draw(NVGcontext *nvg,struct gui_stack *stack, int width, int height)
{
struct gui_panel*iter;
gui_foreach_panel(iter, stack)
execute(nvg, iter->buffer, width, height);
}
static void
key(struct gui_input *in, SDL_Event *evt, gui_bool down)
{
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);
}
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, 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 gui_input in;
struct gui_font font;
struct demo_gui gui;
if (argc < 3) {
fprintf(stdout,"Missing TTF Font file/height argument: nanovg <path> <height>\n");
exit(EXIT_FAILURE);
}
font_path = argv[1];
font_height = (gui_size)MAX(0, atoi(argv[2]));
/* 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(&in, 0, sizeof in);
memset(&gui, 0, sizeof gui);
gui.memory = malloc(MAX_MEMORY);
font.userdata.ptr = vg;
nvgTextMetrics(vg, NULL, NULL, &font.height);
font.width = font_get_width;
gui.width = WINDOW_WIDTH;
gui.height = WINDOW_HEIGHT;
init_demo(&gui, &font);
gui.images.select = nvgCreateImage(vg, "icon/select.bmp", 0);
gui.images.lasso = nvgCreateImage(vg, "icon/lasso.bmp", 0);
gui.images.paint = nvgCreateImage(vg, "icon/paint.bmp", 0);
gui.images.move = nvgCreateImage(vg, "icon/move.bmp", 0);
gui.images.rotate = nvgCreateImage(vg, "icon/rotate.bmp", 0);
gui.images.scale = nvgCreateImage(vg, "icon/scale.bmp", 0);
while (gui.running) {
/* Input */
SDL_Event evt;
started = SDL_GetTicks();
gui_input_begin(&in);
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(&in, &evt, gui_false);
else if (evt.type == SDL_KEYDOWN) key(&in, &evt, gui_true);
else if (evt.type == SDL_MOUSEBUTTONDOWN) btn(&in, &evt, gui_true);
else if (evt.type == SDL_MOUSEBUTTONUP) btn(&in, &evt, gui_false);
else if (evt.type == SDL_MOUSEMOTION) motion(&in, &evt);
else if (evt.type == SDL_TEXTINPUT) text(&in, &evt);
else if (evt.type == SDL_MOUSEWHEEL) gui_input_scroll(&in, evt.wheel.y);
}
gui_input_end(&in);
/* GUI */
SDL_GetWindowSize(win, &width, &height);
run_demo(&gui, &in);
/* Draw */
glClearColor(0.4f, 0.4f, 0.4f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
draw(vg, &gui.layout.stack, width, height);
draw(vg, &gui.stack, width, height);
gui.ms = SDL_GetTicks() - started;
SDL_GL_SwapWindow(win);
/* Timing */
dt = SDL_GetTicks() - started;
gui.ms = dt;
if (dt < DTIME)
SDL_Delay(DTIME - dt);
}
cleanup:
/* Cleanup */
free(gui.memory);
nvgDeleteGLES2(vg);
SDL_GL_DeleteContext(glContext);
SDL_DestroyWindow(win);
SDL_Quit();
return 0;
}
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