bgfx/examples/20-nanovg/nanovg.cpp

/*
 * Copyright 2011-2024 Branimir Karadzic. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
 */

//
// Copyright (c) 2013 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty.  In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//

#include "common.h"
#include "bgfx_utils.h"

#include <bx/string.h>
#include <bx/timer.h>
#include <bimg/decode.h>

#include "entry/entry.h"
#include "imgui/imgui.h"
#include "nanovg/nanovg.h"

BX_PRAGMA_DIAGNOSTIC_PUSH();
BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wunused-parameter");
#define BLENDISH_IMPLEMENTATION
#include "blendish.h"
BX_PRAGMA_DIAGNOSTIC_POP();

namespace
{

#define ICON_SEARCH 0x1F50D
#define ICON_CIRCLED_CROSS 0x2716
#define ICON_CHEVRON_RIGHT 0xE75E
#define ICON_CHECK 0x2713
#define ICON_LOGIN 0xE740
#define ICON_TRASH 0xE729

// Returns 1 if col.rgba is 0.0f,0.0f,0.0f,0.0f, 0 otherwise
int isBlack( struct NVGcolor col )
{
	if( col.r == 0.0f && col.g == 0.0f && col.b == 0.0f && col.a == 0.0f )
	{
		return 1;
	}
	return 0;
}

static char* cpToUTF8(int cp, char* str)
{
	int n = 0;
	if (cp < 0x80) n = 1;
	else if (cp < 0x800) n = 2;
	else if (cp < 0x10000) n = 3;
	else if (cp < 0x200000) n = 4;
	else if (cp < 0x4000000) n = 5;
	else if (cp <= 0x7fffffff) n = 6;

	str[n] = '\0';

	switch (n)
	{
		case 6: str[5] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x4000000; [[fallthrough]];
		case 5: str[4] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x200000;  [[fallthrough]];
		case 4: str[3] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x10000;   [[fallthrough]];
		case 3: str[2] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x800;     [[fallthrough]];
		case 2: str[1] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0xc0;      [[fallthrough]];
		case 1: str[0] = char(cp); break;
	}

	return str;
}

void drawWindow(struct NVGcontext* vg, const char* title, float x, float y, float w, float h)
{
	float cornerRadius = 3.0f;
	struct NVGpaint shadowPaint;
	struct NVGpaint headerPaint;

	nvgSave(vg);
	//	nvgClearState(vg);

	// Window
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x,y, w,h, cornerRadius);
	nvgFillColor(vg, nvgRGBA(28,30,34,192) );
	//	nvgFillColor(vg, nvgRGBA(0,0,0,128) );
	nvgFill(vg);

	// Drop shadow
	shadowPaint = nvgBoxGradient(vg, x,y+2, w,h, cornerRadius*2, 10, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0) );
	nvgBeginPath(vg);
	nvgRect(vg, x-10,y-10, w+20,h+30);
	nvgRoundedRect(vg, x,y, w,h, cornerRadius);
	nvgPathWinding(vg, NVG_HOLE);
	nvgFillPaint(vg, shadowPaint);
	nvgFill(vg);

	// Header
	headerPaint = nvgLinearGradient(vg, x,y,x,y+15, nvgRGBA(255,255,255,8), nvgRGBA(0,0,0,16) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+1,y+1, w-2,30, cornerRadius-1);
	nvgFillPaint(vg, headerPaint);
	nvgFill(vg);
	nvgBeginPath(vg);
	nvgMoveTo(vg, x+0.5f, y+0.5f+30);
	nvgLineTo(vg, x+0.5f+w-1, y+0.5f+30);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,32) );
	nvgStroke(vg);

	nvgFontSize(vg, 18.0f);
	nvgFontFace(vg, "sans-bold");
	nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE);

	nvgFontBlur(vg,2);
	nvgFillColor(vg, nvgRGBA(0,0,0,128) );
	nvgText(vg, x+w/2,y+16+1, title, NULL);

	nvgFontBlur(vg,0);
	nvgFillColor(vg, nvgRGBA(220,220,220,160) );
	nvgText(vg, x+w/2,y+16, title, NULL);

	nvgRestore(vg);
}

void drawSearchBox(struct NVGcontext* vg, const char* text, float x, float y, float w, float h)
{
	struct NVGpaint bg;
	char icon[8];
	float cornerRadius = h/2-1;

	// Edit
	bg = nvgBoxGradient(vg, x,y+1.5f, w,h, h/2,5, nvgRGBA(0,0,0,16), nvgRGBA(0,0,0,92) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x,y, w,h, cornerRadius);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	/*	nvgBeginPath(vg);
		nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, cornerRadius-0.5f);
		nvgStrokeColor(vg, nvgRGBA(0,0,0,48) );
		nvgStroke(vg);*/

	nvgFontSize(vg, h*1.3f);
	nvgFontFace(vg, "icons");
	nvgFillColor(vg, nvgRGBA(255,255,255,64) );
	nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+h*0.55f, y+h*0.55f, cpToUTF8(ICON_SEARCH,icon), NULL);

	nvgFontSize(vg, 20.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,32) );

	nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+h*1.05f,y+h*0.5f,text, NULL);

	nvgFontSize(vg, h*1.3f);
	nvgFontFace(vg, "icons");
	nvgFillColor(vg, nvgRGBA(255,255,255,32) );
	nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+w-h*0.55f, y+h*0.55f, cpToUTF8(ICON_CIRCLED_CROSS,icon), NULL);
}

void drawDropDown(struct NVGcontext* vg, const char* text, float x, float y, float w, float h)
{
	struct NVGpaint bg;
	char icon[8];
	float cornerRadius = 4.0f;

	bg = nvgLinearGradient(vg, x,y,x,y+h, nvgRGBA(255,255,255,16), nvgRGBA(0,0,0,16) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+1,y+1, w-2,h-2, cornerRadius-1);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, cornerRadius-0.5f);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,48) );
	nvgStroke(vg);

	nvgFontSize(vg, 20.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,160) );
	nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+h*0.3f,y+h*0.5f,text, NULL);

	nvgFontSize(vg, h*1.3f);
	nvgFontFace(vg, "icons");
	nvgFillColor(vg, nvgRGBA(255,255,255,64) );
	nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+w-h*0.5f, y+h*0.5f, cpToUTF8(ICON_CHEVRON_RIGHT,icon), NULL);
}

void drawLabel(struct NVGcontext* vg, const char* text, float x, float y, float w, float h)
{
	NVG_NOTUSED(w);

	nvgFontSize(vg, 18.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,128) );

	nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x,y+h*0.5f,text, NULL);
}

void drawEditBoxBase(struct NVGcontext* vg, float x, float y, float w, float h)
{
	struct NVGpaint bg;
	// Edit
	bg = nvgBoxGradient(vg, x+1,y+1+1.5f, w-2,h-2, 3,4, nvgRGBA(255,255,255,32), nvgRGBA(32,32,32,32) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+1,y+1, w-2,h-2, 4-1);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, 4-0.5f);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,48) );
	nvgStroke(vg);
}

void drawEditBox(struct NVGcontext* vg, const char* text, float x, float y, float w, float h)
{
	drawEditBoxBase(vg, x,y, w,h);

	nvgFontSize(vg, 20.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,64) );
	nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+h*0.3f,y+h*0.5f,text, NULL);
}

void drawEditBoxNum(struct NVGcontext* vg,
		const char* text, const char* units, float x, float y, float w, float h)
{
	float uw;

	drawEditBoxBase(vg, x,y, w,h);

	uw = nvgTextBounds(vg, 0,0, units, NULL, NULL);

	nvgFontSize(vg, 18.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,64) );
	nvgTextAlign(vg,NVG_ALIGN_RIGHT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+w-h*0.3f,y+h*0.5f,units, NULL);

	nvgFontSize(vg, 20.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,128) );
	nvgTextAlign(vg,NVG_ALIGN_RIGHT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+w-uw-h*0.5f,y+h*0.5f,text, NULL);
}

void drawCheckBox(struct NVGcontext* vg, const char* text, float x, float y, float w, float h)
{
	struct NVGpaint bg;
	char icon[8];
	NVG_NOTUSED(w);

	nvgFontSize(vg, 18.0f);
	nvgFontFace(vg, "sans");
	nvgFillColor(vg, nvgRGBA(255,255,255,160) );

	nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+28,y+h*0.5f,text, NULL);

	bg = nvgBoxGradient(vg, x+1,y+(int)(h*0.5f)-9+1, 18,18, 3,3, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,92) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+1,y+(int)(h*0.5f)-9, 18,18, 3);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	nvgFontSize(vg, 40);
	nvgFontFace(vg, "icons");
	nvgFillColor(vg, nvgRGBA(255,255,255,128) );
	nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE);
	nvgText(vg, x+9+2, y+h*0.5f, cpToUTF8(ICON_CHECK,icon), NULL);
}

void drawButton(struct NVGcontext* vg, int preicon, const char* text, float x, float y, float w, float h, struct NVGcolor col)
{
	struct NVGpaint bg;
	char icon[8];
	float cornerRadius = 4.0f;
	float tw = 0, iw = 0;

	bg = nvgLinearGradient(vg, x,y,x,y+h, nvgRGBA(255,255,255,isBlack(col)?16:32), nvgRGBA(0,0,0,isBlack(col)?16:32) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+1,y+1, w-2,h-2, cornerRadius-1);
	if (!isBlack(col) ) {
		nvgFillColor(vg, col);
		nvgFill(vg);
	}
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, cornerRadius-0.5f);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,48) );
	nvgStroke(vg);

	nvgFontSize(vg, 20.0f);
	nvgFontFace(vg, "sans-bold");
	tw = nvgTextBounds(vg, 0,0, text, NULL, NULL);
	if (preicon != 0) {
		nvgFontSize(vg, h*1.3f);
		nvgFontFace(vg, "icons");
		iw = nvgTextBounds(vg, 0,0, cpToUTF8(preicon,icon), NULL, NULL);
		iw += h*0.15f;
	}

	if (preicon != 0) {
		nvgFontSize(vg, h*1.3f);
		nvgFontFace(vg, "icons");
		nvgFillColor(vg, nvgRGBA(255,255,255,96) );
		nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
		nvgText(vg, x+w*0.5f-tw*0.5f-iw*0.75f, y+h*0.5f, cpToUTF8(preicon,icon), NULL);
	}

	nvgFontSize(vg, 20.0f);
	nvgFontFace(vg, "sans-bold");
	nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE);
	nvgFillColor(vg, nvgRGBA(0,0,0,160) );
	nvgText(vg, x+w*0.5f-tw*0.5f+iw*0.25f,y+h*0.5f-1,text, NULL);
	nvgFillColor(vg, nvgRGBA(255,255,255,160) );
	nvgText(vg, x+w*0.5f-tw*0.5f+iw*0.25f,y+h*0.5f,text, NULL);
}

void drawSlider(struct NVGcontext* vg, float pos, float x, float y, float w, float h)
{
	struct NVGpaint bg, knob;
	float cy = y+(int)(h*0.5f);
	float kr = (float)( (int)(h*0.25f) );

	nvgSave(vg);
	//	nvgClearState(vg);

	// Slot
	bg = nvgBoxGradient(vg, x,cy-2+1, w,4, 2,2, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,128) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x,cy-2, w,4, 2);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	// Knob Shadow
	bg = nvgRadialGradient(vg, x+(int)(pos*w),cy+1, kr-3,kr+3, nvgRGBA(0,0,0,64), nvgRGBA(0,0,0,0) );
	nvgBeginPath(vg);
	nvgRect(vg, x+(int)(pos*w)-kr-5,cy-kr-5,kr*2+5+5,kr*2+5+5+3);
	nvgCircle(vg, x+(int)(pos*w),cy, kr);
	nvgPathWinding(vg, NVG_HOLE);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	// Knob
	knob = nvgLinearGradient(vg, x,cy-kr,x,cy+kr, nvgRGBA(255,255,255,16), nvgRGBA(0,0,0,16) );
	nvgBeginPath(vg);
	nvgCircle(vg, x+(int)(pos*w),cy, kr-1);
	nvgFillColor(vg, nvgRGBA(40,43,48,255) );
	nvgFill(vg);
	nvgFillPaint(vg, knob);
	nvgFill(vg);

	nvgBeginPath(vg);
	nvgCircle(vg, x+(int)(pos*w),cy, kr-0.5f);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,92) );
	nvgStroke(vg);

	nvgRestore(vg);
}

void drawEyes(struct NVGcontext* vg, float x, float y, float w, float h, float mx, float my, float t)
{
	struct NVGpaint gloss, bg;
	float ex = w *0.23f;
	float ey = h * 0.5f;
	float lx = x + ex;
	float ly = y + ey;
	float rx = x + w - ex;
	float ry = y + ey;
	float dx,dy,d;
	float br = (ex < ey ? ex : ey) * 0.5f;
	float blink = 1 - powf(sinf(t*0.5f),200)*0.8f;

	bg = nvgLinearGradient(vg, x,y+h*0.5f,x+w*0.1f,y+h, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,16) );
	nvgBeginPath(vg);
	nvgEllipse(vg, lx+3.0f,ly+16.0f, ex,ey);
	nvgEllipse(vg, rx+3.0f,ry+16.0f, ex,ey);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	bg = nvgLinearGradient(vg, x,y+h*0.25f,x+w*0.1f,y+h, nvgRGBA(220,220,220,255), nvgRGBA(128,128,128,255) );
	nvgBeginPath(vg);
	nvgEllipse(vg, lx,ly, ex,ey);
	nvgEllipse(vg, rx,ry, ex,ey);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	dx = (mx - rx) / (ex * 10);
	dy = (my - ry) / (ey * 10);
	d = sqrtf(dx*dx+dy*dy);
	if (d > 1.0f) {
		dx /= d; dy /= d;
	}
	dx *= ex*0.4f;
	dy *= ey*0.5f;
	nvgBeginPath(vg);
	nvgEllipse(vg, lx+dx,ly+dy+ey*0.25f*(1-blink), br,br*blink);
	nvgFillColor(vg, nvgRGBA(32,32,32,255) );
	nvgFill(vg);

	dx = (mx - rx) / (ex * 10);
	dy = (my - ry) / (ey * 10);
	d = sqrtf(dx*dx+dy*dy);
	if (d > 1.0f) {
		dx /= d; dy /= d;
	}
	dx *= ex*0.4f;
	dy *= ey*0.5f;
	nvgBeginPath(vg);
	nvgEllipse(vg, rx+dx,ry+dy+ey*0.25f*(1-blink), br,br*blink);
	nvgFillColor(vg, nvgRGBA(32,32,32,255) );
	nvgFill(vg);

	gloss = nvgRadialGradient(vg, lx-ex*0.25f,ly-ey*0.5f, ex*0.1f,ex*0.75f, nvgRGBA(255,255,255,128), nvgRGBA(255,255,255,0) );
	nvgBeginPath(vg);
	nvgEllipse(vg, lx,ly, ex,ey);
	nvgFillPaint(vg, gloss);
	nvgFill(vg);

	gloss = nvgRadialGradient(vg, rx-ex*0.25f,ry-ey*0.5f, ex*0.1f,ex*0.75f, nvgRGBA(255,255,255,128), nvgRGBA(255,255,255,0) );
	nvgBeginPath(vg);
	nvgEllipse(vg, rx,ry, ex,ey);
	nvgFillPaint(vg, gloss);
	nvgFill(vg);
}

void drawGraph(struct NVGcontext* vg, float x, float y, float w, float h, float t)
{
	struct NVGpaint bg;
	float samples[6];
	float sx[6], sy[6];
	float dx = w/5.0f;
	int i;

	samples[0] = (1+sinf(t*1.2345f+cosf(t*0.33457f)*0.44f) )*0.5f;
	samples[1] = (1+sinf(t*0.68363f+cosf(t*1.3f)*1.55f) )*0.5f;
	samples[2] = (1+sinf(t*1.1642f+cosf(t*0.33457f)*1.24f) )*0.5f;
	samples[3] = (1+sinf(t*0.56345f+cosf(t*1.63f)*0.14f) )*0.5f;
	samples[4] = (1+sinf(t*1.6245f+cosf(t*0.254f)*0.3f) )*0.5f;
	samples[5] = (1+sinf(t*0.345f+cosf(t*0.03f)*0.6f) )*0.5f;

	for (i = 0; i < 6; i++) {
		sx[i] = x+i*dx;
		sy[i] = y+h*samples[i]*0.8f;
	}

	// Graph background
	bg = nvgLinearGradient(vg, x,y,x,y+h, nvgRGBA(0,160,192,0), nvgRGBA(0,160,192,64) );
	nvgBeginPath(vg);
	nvgMoveTo(vg, sx[0], sy[0]);
	for (i = 1; i < 6; i++)
		nvgBezierTo(vg, sx[i-1]+dx*0.5f,sy[i-1], sx[i]-dx*0.5f,sy[i], sx[i],sy[i]);
	nvgLineTo(vg, x+w, y+h);
	nvgLineTo(vg, x, y+h);
	nvgFillPaint(vg, bg);
	nvgFill(vg);

	// Graph line
	nvgBeginPath(vg);
	nvgMoveTo(vg, sx[0], sy[0]+2);
	for (i = 1; i < 6; i++)
		nvgBezierTo(vg, sx[i-1]+dx*0.5f,sy[i-1]+2, sx[i]-dx*0.5f,sy[i]+2, sx[i],sy[i]+2);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,32) );
	nvgStrokeWidth(vg, 3.0f);
	nvgStroke(vg);

	nvgBeginPath(vg);
	nvgMoveTo(vg, sx[0], sy[0]);
	for (i = 1; i < 6; i++)
		nvgBezierTo(vg, sx[i-1]+dx*0.5f,sy[i-1], sx[i]-dx*0.5f,sy[i], sx[i],sy[i]);
	nvgStrokeColor(vg, nvgRGBA(0,160,192,255) );
	nvgStrokeWidth(vg, 3.0f);
	nvgStroke(vg);

	// Graph sample pos
	for (i = 0; i < 6; i++) {
		bg = nvgRadialGradient(vg, sx[i],sy[i]+2, 3.0f,8.0f, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,0) );
		nvgBeginPath(vg);
		nvgRect(vg, sx[i]-10, sy[i]-10+2, 20,20);
		nvgFillPaint(vg, bg);
		nvgFill(vg);
	}

	nvgBeginPath(vg);
	for (i = 0; i < 6; i++)
		nvgCircle(vg, sx[i], sy[i], 4.0f);
	nvgFillColor(vg, nvgRGBA(0,160,192,255) );
	nvgFill(vg);
	nvgBeginPath(vg);
	for (i = 0; i < 6; i++)
		nvgCircle(vg, sx[i], sy[i], 2.0f);
	nvgFillColor(vg, nvgRGBA(220,220,220,255) );
	nvgFill(vg);

	nvgStrokeWidth(vg, 1.0f);
}

void drawSpinner(struct NVGcontext* vg, float cx, float cy, float r, float t)
{
	float a0 = 0.0f + t*6;
	float a1 = NVG_PI + t*6;
	float r0 = r;
	float r1 = r * 0.75f;
	float ax,ay, bx,by;
	struct NVGpaint paint;

	nvgSave(vg);

	nvgBeginPath(vg);
	nvgArc(vg, cx,cy, r0, a0, a1, NVG_CW);
	nvgArc(vg, cx,cy, r1, a1, a0, NVG_CCW);
	nvgClosePath(vg);
	ax = cx + cosf(a0) * (r0+r1)*0.5f;
	ay = cy + sinf(a0) * (r0+r1)*0.5f;
	bx = cx + cosf(a1) * (r0+r1)*0.5f;
	by = cy + sinf(a1) * (r0+r1)*0.5f;
	paint = nvgLinearGradient(vg, ax,ay, bx,by, nvgRGBA(0,0,0,0), nvgRGBA(0,0,0,128) );
	nvgFillPaint(vg, paint);
	nvgFill(vg);

	nvgRestore(vg);
}

void drawThumbnails(struct NVGcontext* vg, float x, float y, float w, float h, const int* images, int nimages, float t)
{
	float cornerRadius = 3.0f;
	struct NVGpaint shadowPaint, imgPaint, fadePaint;
	float ix,iy,iw,ih;
	float thumb = 60.0f;
	float arry = 30.5f;
	int imgw, imgh;
	float stackh = (nimages/2) * (thumb+10) + 10;
	int i;
	float u = (1+cosf(t*0.5f) )*0.5f;
	float u2 = (1-cosf(t*0.2f) )*0.5f;
	float scrollh, dv;

	nvgSave(vg);
	//	nvgClearState(vg);

	// Drop shadow
	shadowPaint = nvgBoxGradient(vg, x,y+4, w,h, cornerRadius*2, 20, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0) );
	nvgBeginPath(vg);
	nvgRect(vg, x-10,y-10, w+20,h+30);
	nvgRoundedRect(vg, x,y, w,h, cornerRadius);
	nvgPathWinding(vg, NVG_HOLE);
	nvgFillPaint(vg, shadowPaint);
	nvgFill(vg);

	// Window
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x,y, w,h, cornerRadius);
	nvgMoveTo(vg, x-10,y+arry);
	nvgLineTo(vg, x+1,y+arry-11);
	nvgLineTo(vg, x+1,y+arry+11);
	nvgFillColor(vg, nvgRGBA(200,200,200,255) );
	nvgFill(vg);

	nvgSave(vg);
	nvgScissor(vg, x,y,w,h);
	nvgTranslate(vg, 0, -(stackh - h)*u);

	dv = 1.0f / (float)(nimages-1);

	for (i = 0; i < nimages; i++) {
		float tx, ty, v, a;
		tx = x+10;
		ty = y+10;
		tx += (i%2) * (thumb+10);
		ty += (i/2) * (thumb+10);
		nvgImageSize(vg, images[i], &imgw, &imgh);
		if (imgw < imgh) {
			iw = thumb;
			ih = iw * (float)imgh/(float)imgw;
			ix = 0;
			iy = -(ih-thumb)*0.5f;
		} else {
			ih = thumb;
			iw = ih * (float)imgw/(float)imgh;
			ix = -(iw-thumb)*0.5f;
			iy = 0;
		}

		v = i * dv;
		a = bx::clamp((u2-v) / dv, 0.0f, 1.0f);

		if (a < 1.0f)
			drawSpinner(vg, tx+thumb/2,ty+thumb/2, thumb*0.25f, t);

		imgPaint = nvgImagePattern(vg, tx+ix, ty+iy, iw,ih, 0.0f/180.0f*NVG_PI, images[i], a);
		nvgBeginPath(vg);
		nvgRoundedRect(vg, tx,ty, thumb,thumb, 5);
		nvgFillPaint(vg, imgPaint);
		nvgFill(vg);

		shadowPaint = nvgBoxGradient(vg, tx-1,ty, thumb+2,thumb+2, 5, 3, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0) );
		nvgBeginPath(vg);
		nvgRect(vg, tx-5,ty-5, thumb+10,thumb+10);
		nvgRoundedRect(vg, tx,ty, thumb,thumb, 6);
		nvgPathWinding(vg, NVG_HOLE);
		nvgFillPaint(vg, shadowPaint);
		nvgFill(vg);

		nvgBeginPath(vg);
		nvgRoundedRect(vg, tx+0.5f,ty+0.5f, thumb-1,thumb-1, 4-0.5f);
		nvgStrokeWidth(vg,1.0f);
		nvgStrokeColor(vg, nvgRGBA(255,255,255,192) );
		nvgStroke(vg);
	}
	nvgRestore(vg);

	// Hide fades
	fadePaint = nvgLinearGradient(vg, x,y,x,y+6, nvgRGBA(200,200,200,255), nvgRGBA(200,200,200,0) );
	nvgBeginPath(vg);
	nvgRect(vg, x+4,y,w-8,6);
	nvgFillPaint(vg, fadePaint);
	nvgFill(vg);

	fadePaint = nvgLinearGradient(vg, x,y+h,x,y+h-6, nvgRGBA(200,200,200,255), nvgRGBA(200,200,200,0) );
	nvgBeginPath(vg);
	nvgRect(vg, x+4,y+h-6,w-8,6);
	nvgFillPaint(vg, fadePaint);
	nvgFill(vg);

	// Scroll bar
	shadowPaint = nvgBoxGradient(vg, x+w-12+1,y+4+1, 8,h-8, 3,4, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,92) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+w-12,y+4, 8,h-8, 3);
	nvgFillPaint(vg, shadowPaint);
	//	nvgFillColor(vg, nvgRGBA(255,0,0,128) );
	nvgFill(vg);

	scrollh = (h/stackh) * (h-8);
	shadowPaint = nvgBoxGradient(vg, x+w-12-1,y+4+(h-8-scrollh)*u-1, 8,scrollh, 3,4, nvgRGBA(220,220,220,255), nvgRGBA(128,128,128,255) );
	nvgBeginPath(vg);
	nvgRoundedRect(vg, x+w-12+1,y+4+1 + (h-8-scrollh)*u, 8-2,scrollh-2, 2);
	nvgFillPaint(vg, shadowPaint);
	//	nvgFillColor(vg, nvgRGBA(0,0,0,128) );
	nvgFill(vg);

	nvgRestore(vg);
}

void drawColorwheel(struct NVGcontext* vg, float x, float y, float w, float h, float t)
{
	int i;
	float r0, r1, ax,ay, bx,by, cx,cy, aeps, r;
	float hue = sinf(t * 0.12f);
	struct NVGpaint paint;

	nvgSave(vg);

	/*	nvgBeginPath(vg);
		nvgRect(vg, x,y,w,h);
		nvgFillColor(vg, nvgRGBA(255,0,0,128) );
		nvgFill(vg);*/

	cx = x + w*0.5f;
	cy = y + h*0.5f;
	r1 = (w < h ? w : h) * 0.5f - 5.0f;
	r0 = r1 - 20.0f;
	aeps = 0.5f / r1;	// half a pixel arc length in radians (2pi cancels out).

	for (i = 0; i < 6; i++)
	{
		float a0 = (float)i / 6.0f * NVG_PI * 2.0f - aeps;
		float a1 = (float)(i+1.0f) / 6.0f * NVG_PI * 2.0f + aeps;
		nvgBeginPath(vg);
		nvgArc(vg, cx,cy, r0, a0, a1, NVG_CW);
		nvgArc(vg, cx,cy, r1, a1, a0, NVG_CCW);
		nvgClosePath(vg);
		ax = cx + cosf(a0) * (r0+r1)*0.5f;
		ay = cy + sinf(a0) * (r0+r1)*0.5f;
		bx = cx + cosf(a1) * (r0+r1)*0.5f;
		by = cy + sinf(a1) * (r0+r1)*0.5f;
		paint = nvgLinearGradient(vg, ax,ay, bx,by, nvgHSLA(a0/(NVG_PI*2),1.0f,0.55f,255), nvgHSLA(a1/(NVG_PI*2),1.0f,0.55f,255) );
		nvgFillPaint(vg, paint);
		nvgFill(vg);
	}

	nvgBeginPath(vg);
	nvgCircle(vg, cx,cy, r0-0.5f);
	nvgCircle(vg, cx,cy, r1+0.5f);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,64) );
	nvgStrokeWidth(vg, 1.0f);
	nvgStroke(vg);

	// Selector
	nvgSave(vg);
	nvgTranslate(vg, cx,cy);
	nvgRotate(vg, hue*NVG_PI*2);

	// Marker on
	nvgStrokeWidth(vg, 2.0f);
	nvgBeginPath(vg);
	nvgRect(vg, r0-1,-3,r1-r0+2,6);
	nvgStrokeColor(vg, nvgRGBA(255,255,255,192) );
	nvgStroke(vg);

	paint = nvgBoxGradient(vg, r0-3,-5,r1-r0+6,10, 2,4, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0) );
	nvgBeginPath(vg);
	nvgRect(vg, r0-2-10,-4-10,r1-r0+4+20,8+20);
	nvgRect(vg, r0-2,-4,r1-r0+4,8);
	nvgPathWinding(vg, NVG_HOLE);
	nvgFillPaint(vg, paint);
	nvgFill(vg);

	// Center triangle
	r = r0 - 6;
	ax = cosf(120.0f/180.0f*NVG_PI) * r;
	ay = sinf(120.0f/180.0f*NVG_PI) * r;
	bx = cosf(-120.0f/180.0f*NVG_PI) * r;
	by = sinf(-120.0f/180.0f*NVG_PI) * r;
	nvgBeginPath(vg);
	nvgMoveTo(vg, r,0);
	nvgLineTo(vg, ax,ay);
	nvgLineTo(vg, bx,by);
	nvgClosePath(vg);
	paint = nvgLinearGradient(vg, r,0, ax,ay, nvgHSLA(hue,1.0f,0.5f,255), nvgRGBA(255,255,255,255) );
	nvgFillPaint(vg, paint);
	nvgFill(vg);
	paint = nvgLinearGradient(vg, (r+ax)*0.5f,(0+ay)*0.5f, bx,by, nvgRGBA(0,0,0,0), nvgRGBA(0,0,0,255) );
	nvgFillPaint(vg, paint);
	nvgFill(vg);
	nvgStrokeColor(vg, nvgRGBA(0,0,0,64) );
	nvgStroke(vg);

	// Select circle on triangle
	ax = cosf(120.0f/180.0f*NVG_PI) * r*0.3f;
	ay = sinf(120.0f/180.0f*NVG_PI) * r*0.4f;
	nvgStrokeWidth(vg, 2.0f);
	nvgBeginPath(vg);
	nvgCircle(vg, ax,ay,5);
	nvgStrokeColor(vg, nvgRGBA(255,255,255,192) );
	nvgStroke(vg);

	paint = nvgRadialGradient(vg, ax,ay, 7,9, nvgRGBA(0,0,0,64), nvgRGBA(0,0,0,0) );
	nvgBeginPath(vg);
	nvgRect(vg, ax-20,ay-20,40,40);
	nvgCircle(vg, ax,ay,7);
	nvgPathWinding(vg, NVG_HOLE);
	nvgFillPaint(vg, paint);
	nvgFill(vg);

	nvgRestore(vg);

	nvgRestore(vg);
}

void drawLines(struct NVGcontext* vg, float x, float y, float w, float h, float t)
{
	int i, j;
	float pad = 5.0f, s = w/9.0f - pad*2;
	float pts[4*2], fx, fy;
	int joins[3] = {NVG_MITER, NVG_ROUND, NVG_BEVEL};
	int caps[3] = {NVG_BUTT, NVG_ROUND, NVG_SQUARE};
	NVG_NOTUSED(h);

	nvgSave(vg);
	pts[0] = -s*0.25f + cosf(t*0.3f) * s*0.5f;
	pts[1] = sinf(t*0.3f) * s*0.5f;
	pts[2] = -s*0.25f;
	pts[3] = 0;
	pts[4] = s*0.25f;
	pts[5] = 0;
	pts[6] = s*0.25f + cosf(-t*0.3f) * s*0.5f;
	pts[7] = sinf(-t*0.3f) * s*0.5f;

	for (i = 0; i < 3; i++)
	{
		for (j = 0; j < 3; j++)
		{
			fx = x + s*0.5f + (i*3+j)/9.0f*w + pad;
			fy = y - s*0.5f + pad;

			nvgLineCap(vg, caps[i]);
			nvgLineJoin(vg, joins[j]);

			nvgStrokeWidth(vg, s*0.3f);
			nvgStrokeColor(vg, nvgRGBA(0,0,0,160) );
			nvgBeginPath(vg);
			nvgMoveTo(vg, fx+pts[0], fy+pts[1]);
			nvgLineTo(vg, fx+pts[2], fy+pts[3]);
			nvgLineTo(vg, fx+pts[4], fy+pts[5]);
			nvgLineTo(vg, fx+pts[6], fy+pts[7]);
			nvgStroke(vg);

			nvgLineCap(vg, NVG_BUTT);
			nvgLineJoin(vg, NVG_BEVEL);

			nvgStrokeWidth(vg, 1.0f);
			nvgStrokeColor(vg, nvgRGBA(0,192,255,255) );
			nvgBeginPath(vg);
			nvgMoveTo(vg, fx+pts[0], fy+pts[1]);
			nvgLineTo(vg, fx+pts[2], fy+pts[3]);
			nvgLineTo(vg, fx+pts[4], fy+pts[5]);
			nvgLineTo(vg, fx+pts[6], fy+pts[7]);
			nvgStroke(vg);
		}
	}


	nvgRestore(vg);
}

void drawBlendish(struct NVGcontext* _vg, float _x, float _y, float _w, float _h, float _t)
{
	float x = _x;
	float y = _y;

	bndBackground(_vg, _x - 10.0f, _y - 10.0f, _w, _h);

	bndToolButton(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_DEFAULT, BND_ICONID(6, 3), "Default");
	y += 25.0f;
	bndToolButton(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_HOVER, BND_ICONID(6, 3), "Hovered");
	y += 25.0f;
	bndToolButton(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_ACTIVE, BND_ICONID(6, 3), "Active");

	y += 40.0f;
	bndRadioButton(_vg, x, y, 80.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_DEFAULT, -1, "Default");
	y += 25.0f;
	bndRadioButton(_vg, x, y, 80.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_HOVER, -1, "Hovered");
	y += 25.0f;
	bndRadioButton(_vg, x, y, 80.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_ACTIVE, -1, "Active");

	y += 25.0f;
	bndLabel(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, -1, "Label:");
	y += float(BND_WIDGET_HEIGHT);
	bndChoiceButton(_vg, x, y, 80.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_DEFAULT, -1, "Default");
	y += 25.0f;
	bndChoiceButton(_vg, x, y, 80.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_HOVER, -1, "Hovered");
	y += 25.0f;
	bndChoiceButton(_vg, x, y, 80.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_ACTIVE, -1, "Active");

	y += 25.0f;
	float ry = y;
	float rx = x;

	y = _y;
	x += 130.0f;
	bndOptionButton(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_DEFAULT, "Default");
	y += 25.0f;
	bndOptionButton(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_HOVER, "Hovered");
	y += 25.0f;
	bndOptionButton(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_ACTIVE, "Active");

	y += 40.0f;
	bndNumberField(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_DOWN, BND_DEFAULT, "Top", "100");
	y += float(BND_WIDGET_HEIGHT) - 2.0f;
	bndNumberField(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, "Center", "100");
	y += float(BND_WIDGET_HEIGHT) - 2.0f;
	bndNumberField(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_TOP, BND_DEFAULT, "Bottom", "100");

	float mx = x - 30.0f;
	float my = y - 12.0f;
	float mw = 120.0f;
	bndMenuBackground(_vg, mx, my, mw, 120.0f, BND_CORNER_TOP);
	bndMenuLabel(_vg, mx, my, mw, BND_WIDGET_HEIGHT, -1, "Menu Title");
	my += float(BND_WIDGET_HEIGHT) - 2.0f;
	bndMenuItem(_vg, mx, my, mw, BND_WIDGET_HEIGHT, BND_DEFAULT, BND_ICONID(17, 3), "Default");
	my += float(BND_WIDGET_HEIGHT) - 2.0f;
	bndMenuItem(_vg, mx, my, mw, BND_WIDGET_HEIGHT, BND_HOVER, BND_ICONID(18, 3), "Hovered");
	my += float(BND_WIDGET_HEIGHT) - 2.0f;
	bndMenuItem(_vg, mx, my, mw, BND_WIDGET_HEIGHT, BND_ACTIVE, BND_ICONID(19, 3), "Active");

	y = _y;
	x += 130.0f;
	float ox = x;
	bndNumberField(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_DEFAULT, "Default", "100");
	y += 25.0f;
	bndNumberField(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_HOVER, "Hovered", "100");
	y += 25.0f;
	bndNumberField(_vg, x, y, 120.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_ACTIVE, "Active", "100");

	y += 40.0f;
	bndRadioButton(_vg, x, y, 60.0f, BND_WIDGET_HEIGHT, BND_CORNER_RIGHT, BND_DEFAULT, -1, "One");
	x += 60.0f - 1.0f;
	bndRadioButton(_vg, x, y, 60.0f, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, -1, "Two");
	x += 60.0f - 1.0f;
	bndRadioButton(_vg, x, y, 60.0f, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, -1, "Three");
	x += 60.0f - 1.0f;
	bndRadioButton(_vg, x, y, 60.0f, BND_WIDGET_HEIGHT, BND_CORNER_LEFT, BND_ACTIVE, -1, "Butts");

	x = ox;
	y += 40.0f;
	float progress_value = fmodf(_t / 10.0f, 1.0f);
	char progress_label[32];
	bx::snprintf(progress_label, BX_COUNTOF(progress_label), "%d%%", int(progress_value * 100 + 0.5f) );
	bndSlider(_vg, x, y, 240, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_DEFAULT, progress_value, "Default", progress_label);
	y += 25.0f;
	bndSlider(_vg, x, y, 240, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_HOVER, progress_value, "Hovered", progress_label);
	y += 25.0f;
	bndSlider(_vg, x, y, 240, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_ACTIVE, progress_value, "Active", progress_label);

	float rw = x + 240.0f - rx;
	float s_offset = sinf(_t / 2.0f) * 0.5f + 0.5f;
	float s_size = cosf(_t / 3.11f) * 0.5f + 0.5f;

	bndScrollBar(_vg, rx, ry, rw, BND_SCROLLBAR_HEIGHT, BND_DEFAULT, s_offset, s_size);
	ry += 20.0f;
	bndScrollBar(_vg, rx, ry, rw, BND_SCROLLBAR_HEIGHT, BND_HOVER, s_offset, s_size);
	ry += 20.0f;
	bndScrollBar(_vg, rx, ry, rw, BND_SCROLLBAR_HEIGHT, BND_ACTIVE, s_offset, s_size);

	const char edit_text[] = "The quick brown fox";
	int textlen = int(strlen(edit_text) + 1);
	int t = int(_t * 2);
	int idx1 = (t / textlen) % textlen;
	int idx2 = idx1 + (t % (textlen - idx1) );

	ry += 25.0f;
	bndTextField(_vg, rx, ry, 240.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_DEFAULT, -1, edit_text, idx1, idx2);
	ry += 25.0f;
	bndTextField(_vg, rx, ry, 240.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_HOVER, -1, edit_text, idx1, idx2);
	ry += 25.0f;
	bndTextField(_vg, rx, ry, 240.0f, BND_WIDGET_HEIGHT, BND_CORNER_NONE, BND_ACTIVE, -1, edit_text, idx1, idx2);

	rx += rw + 20.0f;
	ry = _y;
	bndScrollBar(_vg, rx, ry, BND_SCROLLBAR_WIDTH, 240.0f, BND_DEFAULT, s_offset, s_size);
	rx += 20.0f;
	bndScrollBar(_vg, rx, ry, BND_SCROLLBAR_WIDTH, 240.0f, BND_HOVER, s_offset, s_size);
	rx += 20.0f;
	bndScrollBar(_vg, rx, ry, BND_SCROLLBAR_WIDTH, 240.0f, BND_ACTIVE, s_offset, s_size);

	x = ox;
	y += 40.0f;
	bndToolButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_RIGHT, BND_DEFAULT, BND_ICONID(0, 10), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndToolButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(1, 10), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndToolButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(2, 10), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndToolButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(3, 10), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndToolButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(4, 10), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndToolButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_LEFT, BND_DEFAULT, BND_ICONID(5, 10), NULL);
	x += BND_TOOL_WIDTH - 1;
	x += 5.0f;
	bndRadioButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_RIGHT, BND_DEFAULT, BND_ICONID(0, 11), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndRadioButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(1, 11), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndRadioButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(2, 11), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndRadioButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_DEFAULT, BND_ICONID(3, 11), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndRadioButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_ALL, BND_ACTIVE, BND_ICONID(4, 11), NULL);
	x += BND_TOOL_WIDTH - 1;
	bndRadioButton(_vg, x, y, BND_TOOL_WIDTH, BND_WIDGET_HEIGHT, BND_CORNER_LEFT, BND_DEFAULT, BND_ICONID(5, 11), NULL);
}

struct DemoData
{
	int fontNormal, fontBold, fontIcons, fontEmoji;
	int images[12];
};

int32_t createImage(struct NVGcontext* _ctx, const char* _filePath, int _imageFlags)
{
	uint32_t size;
	void* data = load(_filePath, &size);
	if (NULL == data)
	{
		return 0;
	}

	bimg::ImageContainer* imageContainer = bimg::imageParse(
		  entry::getAllocator()
		, data
		, size
		, bimg::TextureFormat::RGBA8
		);
	unload(data);

	if (NULL == imageContainer)
	{
		return 0;
	}

	int32_t texId = nvgCreateImageRGBA(
		  _ctx
		, imageContainer->m_width
		, imageContainer->m_height
		, _imageFlags
		, (const uint8_t*)imageContainer->m_data
		);

	bimg::imageFree(imageContainer);

	return texId;
}

int32_t createFont(NVGcontext* _ctx, const char* _name, const char* _filePath)
{
	uint32_t size;
	void* data = load(_filePath, &size);
	if (NULL == data)
	{
		return -1;
	}

	return nvgCreateFontMem(_ctx, _name, (uint8_t*)data, size, 0);
}

int loadDemoData(struct NVGcontext* vg, struct DemoData* data)
{
	int i;

	if (vg == NULL)
		return -1;

	for (i = 0; i < 12; i++)
	{
		char file[128];
		bx::snprintf(file, 128, "images/image%d.jpg", i+1);
		data->images[i] = createImage(vg, file, 0);
		if (data->images[i] == 0)
		{
			bx::debugPrintf("Could not load %s.\n", file);
			return -1;
		}
	}

	int32_t result = 0;

	data->fontIcons = createFont(vg, "icons", "font/entypo.ttf");
	if (data->fontIcons == -1)
	{
		bx::debugPrintf("Could not add font icons.\n");
		result = -1;
	}

	data->fontNormal = createFont(vg, "sans", "font/roboto-regular.ttf");
	if (data->fontNormal == -1)
	{
		bx::debugPrintf("Could not add font italic.\n");
		result = -1;
	}

	data->fontBold = createFont(vg, "sans-bold", "font/roboto-bold.ttf");
	if (data->fontBold == -1)
	{
		bx::debugPrintf("Could not add font bold.\n");
		result = -1;
	}

	data->fontEmoji = createFont(vg, "emoji", "font/NotoEmoji-Regular.ttf");
	if (data->fontEmoji == -1)
	{
		bx::debugPrintf("Could not add font emoji.\n");
		result = -1;
	}

	nvgAddFallbackFontId(vg, data->fontNormal, data->fontEmoji);
	nvgAddFallbackFontId(vg, data->fontBold, data->fontEmoji);

	return result;
}

void freeDemoData(struct NVGcontext* vg, struct DemoData* data)
{
	int i;

	if (vg == NULL)
		return;

	for (i = 0; i < 12; i++)
		nvgDeleteImage(vg, data->images[i]);
}

void drawParagraph(struct NVGcontext* vg, float x, float y, float width, float height, float mx, float my)
{
	struct NVGtextRow rows[3];
	struct NVGglyphPosition glyphs[100];
	const char* text = "This is longer chunk of text.\n  \n  Would have used lorem ipsum but she    was busy jumping over the lazy dog with the fox and all the men who came to the aid of the party.🎉";
	const char* start;
	const char* end;
	int nrows, i, nglyphs, j, lnum = 0;
	float lineh;
	float caretx, px;
	float bounds[4];
	float a;
	float gx = 0.0f, gy = 0.0f;
	int gutter = 0;
	NVG_NOTUSED(height);

	nvgSave(vg);

	nvgFontSize(vg, 18.0f);
	nvgFontFace(vg, "sans");
	nvgTextAlign(vg, NVG_ALIGN_LEFT|NVG_ALIGN_TOP);
	nvgTextMetrics(vg, NULL, NULL, &lineh);

	// The text break API can be used to fill a large buffer of rows,
	// or to iterate over the text just few lines (or just one) at a time.
	// The "next" variable of the last returned item tells where to continue.
	start = text;
	end = text + strlen(text);
	for (nrows = nvgTextBreakLines(vg, start, end, width, rows, 3); 0 != nrows; nrows = nvgTextBreakLines(vg, start, end, width, rows, 3) )
	{
		for (i = 0; i < nrows; i++) {
			struct NVGtextRow* row = &rows[i];
			int hit = mx > x && mx < (x+width) && my >= y && my < (y+lineh);

			nvgBeginPath(vg);
			nvgFillColor(vg, nvgRGBA(255,255,255,hit?64:16) );
			nvgRect(vg, x, y, row->width, lineh);
			nvgFill(vg);

			nvgFillColor(vg, nvgRGBA(255,255,255,255) );
			nvgText(vg, x, y, row->start, row->end);

			if (hit) {
				caretx = (mx < x+row->width/2) ? x : x+row->width;
				px = x;
				nglyphs = nvgTextGlyphPositions(vg, x, y, row->start, row->end, glyphs, 100);
				for (j = 0; j < nglyphs; j++) {
					float x0 = glyphs[j].x;
					float x1 = (j+1 < nglyphs) ? glyphs[j+1].x : x+row->width;
					float tgx = x0 * 0.3f + x1 * 0.7f;
					if (mx >= px && mx < tgx)
						caretx = glyphs[j].x;
					px = tgx;
				}
				nvgBeginPath(vg);
				nvgFillColor(vg, nvgRGBA(255,192,0,255) );
				nvgRect(vg, caretx, y, 1, lineh);
				nvgFill(vg);

				gutter = lnum+1;
				gx = x - 10;
				gy = y + lineh/2;
			}
			lnum++;
			y += lineh;
		}
		// Keep going...
		start = rows[nrows-1].next;
	}

	if (gutter)
	{
		char txt[16];
		bx::snprintf(txt, sizeof(txt), "%d", gutter);
		nvgFontSize(vg, 13.0f);
		nvgTextAlign(vg, NVG_ALIGN_RIGHT|NVG_ALIGN_MIDDLE);

		nvgTextBounds(vg, gx,gy, txt, NULL, bounds);

		nvgBeginPath(vg);
		nvgFillColor(vg, nvgRGBA(255,192,0,255) );
		nvgRoundedRect(vg
			,  bx::round(bounds[0])-4.0f
			,  bx::round(bounds[1])-2.0f
			,  bx::round(bounds[2]-bounds[0])+8.0f
			,  bx::round(bounds[3]-bounds[1])+4.0f
			, (bx::round(bounds[3]-bounds[1])+4.0f)/2.0f-1.0f
			);
		nvgFill(vg);

		nvgFillColor(vg, nvgRGBA(32,32,32,255) );
		nvgText(vg, gx,gy, txt, NULL);
	}

	y += 20.0f;

	nvgFontSize(vg, 13.0f);
	nvgTextAlign(vg, NVG_ALIGN_LEFT|NVG_ALIGN_TOP);
	nvgTextLineHeight(vg, 1.2f);

	nvgTextBoxBounds(vg, x,y, 150, "Hover your mouse over the text to see calculated caret position.", NULL, bounds);

	// Fade the tooltip out when close to it.
	gx = bx::abs((mx - (bounds[0]+bounds[2])*0.5f) / (bounds[0] - bounds[2]) );
	gy = bx::abs((my - (bounds[1]+bounds[3])*0.5f) / (bounds[1] - bounds[3]) );
	a = bx::max(gx, gy) - 0.5f;
	a = bx::clamp(a, 0.0f, 1.0f);
	nvgGlobalAlpha(vg, a);

	nvgBeginPath(vg);
	nvgFillColor(vg, nvgRGBA(220,220,220,255) );
	nvgRoundedRect(vg
		, bx::round(bounds[0]-2.0f)
		, bx::round(bounds[1]-2.0f)
		, bx::round(bounds[2]-bounds[0])+4.0f
		, bx::round(bounds[3]-bounds[1])+4.0f
		, 3.0f
		);
	px = float( (int)( (bounds[2]+bounds[0])/2) );
	nvgMoveTo(vg, px,bounds[1] - 10);
	nvgLineTo(vg, px+7,bounds[1]+1);
	nvgLineTo(vg, px-7,bounds[1]+1);
	nvgFill(vg);

	nvgFillColor(vg, nvgRGBA(0,0,0,220) );
	nvgTextBox(vg, x,y, 150, "Hover your mouse over the text to see calculated caret position.", NULL);

	nvgRestore(vg);
}

void drawWidths(struct NVGcontext* vg, float x, float y, float width)
{
	int i;

	nvgSave(vg);

	nvgStrokeColor(vg, nvgRGBA(0,0,0,255) );

	for (i = 0; i < 20; i++)
	{
		float w = (i+0.5f)*0.1f;
		nvgStrokeWidth(vg, w);
		nvgBeginPath(vg);
		nvgMoveTo(vg, x,y);
		nvgLineTo(vg, x+width,y+width*0.3f);
		nvgStroke(vg);
		y += 10;
	}

	nvgRestore(vg);
}

void drawCaps(struct NVGcontext* vg, float x, float y, float width)
{
	int i;
	int caps[3] = {NVG_BUTT, NVG_ROUND, NVG_SQUARE};
	float lineWidth = 8.0f;

	nvgSave(vg);

	nvgBeginPath(vg);
	nvgRect(vg, x-lineWidth/2, y, width+lineWidth, 40);
	nvgFillColor(vg, nvgRGBA(255,255,255,32) );
	nvgFill(vg);

	nvgBeginPath(vg);
	nvgRect(vg, x, y, width, 40);
	nvgFillColor(vg, nvgRGBA(255,255,255,32) );
	nvgFill(vg);

	nvgStrokeWidth(vg, lineWidth);
	for (i = 0; i < 3; i++) {
		nvgLineCap(vg, caps[i]);
		nvgStrokeColor(vg, nvgRGBA(0,0,0,255) );
		nvgBeginPath(vg);
		nvgMoveTo(vg, x, y + i*10 + 5);
		nvgLineTo(vg, x+width, y + i*10 + 5);
		nvgStroke(vg);
	}

	nvgRestore(vg);
}

void drawScissor(struct NVGcontext* vg, float x, float y, float t)
{
	nvgSave(vg);

	// Draw first rect and set scissor to it's area.
	nvgTranslate(vg, x, y);
	nvgRotate(vg, nvgDegToRad(5) );
	nvgBeginPath(vg);
	nvgRect(vg, -20,-20,60,40);
	nvgFillColor(vg, nvgRGBA(255,0,0,255) );
	nvgFill(vg);
	nvgScissor(vg, -20,-20,60,40);

	// Draw second rectangle with offset and rotation.
	nvgTranslate(vg, 40,0);
	nvgRotate(vg, t);

	// Draw the intended second rectangle without any scissoring.
	nvgSave(vg);
	nvgResetScissor(vg);
	nvgBeginPath(vg);
	nvgRect(vg, -20,-10,60,30);
	nvgFillColor(vg, nvgRGBA(255,128,0,64) );
	nvgFill(vg);
	nvgRestore(vg);

	// Draw second rectangle with combined scissoring.
	nvgIntersectScissor(vg, -20,-10,60,30);
	nvgBeginPath(vg);
	nvgRect(vg, -20,-10,60,30);
	nvgFillColor(vg, nvgRGBA(255,128,0,255) );
	nvgFill(vg);

	nvgRestore(vg);
}

void renderDemo(struct NVGcontext* vg, float mx, float my, float width, float height, float t, int blowup, struct DemoData* data)
{
	float x,y,popx,popy;

	drawEyes(vg, width-800, height-240, 150, 100, mx, my, t);
	drawParagraph(vg, width - 550, 35, 150, 100, mx, my);
	drawGraph(vg, 0, height/2, width, height/2, t);

	drawColorwheel(vg, width-350, 35, 250.0f, 250.0f, t);

	// Line joints
	drawLines(vg, 50, height-50, 600, 35, t);

	// Line caps
	drawWidths(vg, width-50, 35, 30);

	// Line caps
	drawCaps(vg, width-50, 260, 30);

	drawScissor(vg, 40, height-150, t);

	nvgSave(vg);
	if (blowup)
	{
		nvgRotate(vg, sinf(t*0.3f)*5.0f/180.0f*NVG_PI);
		nvgScale(vg, 2.0f, 2.0f);
	}

	// Widgets.
	x = width-520; y = height-420;
	drawWindow(vg, "Widgets `n Stuff", x, y, 300, 400);
	x += 10;
	y += 45;
	drawSearchBox(vg, "Search", x,y,280,25);
	y += 40;
	drawDropDown(vg, "Effects", x,y,280,28);
	popx = x + 300;
	popy = y + 14;
	y += 45;

	// Form
	drawLabel(vg, "Login", x,y, 280,20);
	y += 25;
	drawEditBox(vg, "Email",  x,y, 280,28);
	y += 35;
	drawEditBox(vg, "Password", x,y, 280,28);
	y += 38;
	drawCheckBox(vg, "Remember me", x,y, 140,28);
	drawButton(vg, ICON_LOGIN, "Sign in", x+138, y, 140, 28, nvgRGBA(0,96,128,255) );
	y += 45;

	// Slider
	drawLabel(vg, "Diameter", x,y, 280,20);
	y += 25;
	drawEditBoxNum(vg, "123.00", "px", x+180,y, 100,28);
	drawSlider(vg, 0.4f, x,y, 170,28);
	y += 55;

	drawButton(vg, ICON_TRASH, "Delete", x, y, 160, 28, nvgRGBA(128,16,8,255) );
	drawButton(vg, 0, "Cancel", x+170, y, 110, 28, nvgRGBA(0,0,0,0) );

	// Thumbnails box
	drawThumbnails(vg, popx, popy-30, 160, 300, data->images, 12, t);

	// Blendish
	drawBlendish(vg, 10, 62, 600.0f, 420.0f, t);

	nvgRestore(vg);
}

class ExampleNanoVG : public entry::AppI
{
public:
	ExampleNanoVG(const char* _name, const char* _description, const char* _url)
		: entry::AppI(_name, _description, _url)
	{
	}

	void init(int32_t _argc, const char* const* _argv, uint32_t _width, uint32_t _height) override
	{
		Args args(_argc, _argv);

		m_width  = _width;
		m_height = _height;
		m_debug  = BGFX_DEBUG_NONE;
		m_reset  = BGFX_RESET_VSYNC;

		bgfx::Init init;
		init.type     = args.m_type;
		init.vendorId = args.m_pciId;
		init.platformData.nwh  = entry::getNativeWindowHandle(entry::kDefaultWindowHandle);
		init.platformData.ndt  = entry::getNativeDisplayHandle();
		init.platformData.type = entry::getNativeWindowHandleType();
		init.resolution.width  = m_width;
		init.resolution.height = m_height;
		init.resolution.reset  = m_reset;
		bgfx::init(init);

		// Enable debug text.
		bgfx::setDebug(m_debug);

		// Set view 0 clear state.
		bgfx::setViewClear(0
			, BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH
			, 0x303030ff
			, 1.0f
			, 0
			);

		imguiCreate();

		m_nvg = nvgCreate(1, 0);
		bgfx::setViewMode(0, bgfx::ViewMode::Sequential);

		loadDemoData(m_nvg, &m_data);

		bndSetFont(createFont(m_nvg, "droidsans", "font/droidsans.ttf") );
		bndSetIconImage(createImage(m_nvg, "images/blender_icons16.png", 0) );

		m_timeOffset = bx::getHPCounter();
	}

	int shutdown() override
	{
		freeDemoData(m_nvg, &m_data);

		nvgDelete(m_nvg);

		imguiDestroy();

		// Shutdown bgfx.
		bgfx::shutdown();

		return 0;
	}

	bool update() override
	{
		if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState) )
		{
			imguiBeginFrame(m_mouseState.m_mx
				,  m_mouseState.m_my
				, (m_mouseState.m_buttons[entry::MouseButton::Left  ] ? IMGUI_MBUT_LEFT   : 0)
				| (m_mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT  : 0)
				| (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
				,  m_mouseState.m_mz
				, uint16_t(m_width)
				, uint16_t(m_height)
				);

			showExampleDialog(this);

			imguiEndFrame();

			int64_t now = bx::getHPCounter();
			const double freq = double(bx::getHPFrequency() );
			float time = (float)( (now-m_timeOffset)/freq);

			// Set view 0 default viewport.
			bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );

			// This dummy draw call is here to make sure that view 0 is cleared
			// if no other draw calls are submitted to view 0.
			bgfx::touch(0);

			nvgBeginFrame(m_nvg, float(m_width), float(m_height), 1.0f);

			renderDemo(m_nvg, float(m_mouseState.m_mx), float(m_mouseState.m_my), float(m_width), float(m_height), time, 0, &m_data);

			nvgEndFrame(m_nvg);

			// Advance to next frame. Rendering thread will be kicked to
			// process submitted rendering primitives.
			bgfx::frame();

			return true;
		}

		return false;
	}

	uint32_t m_width;
	uint32_t m_height;
	uint32_t m_debug;
	uint32_t m_reset;

	entry::MouseState m_mouseState;

	int64_t m_timeOffset;

	NVGcontext* m_nvg;
	DemoData m_data;
};

} // namespace

ENTRY_IMPLEMENT_MAIN(
	  ExampleNanoVG
	, "20-nanovg"
	, "NanoVG is small antialiased vector graphics rendering library."
	, "https://bkaradzic.github.io/bgfx/examples.html#nanovg"
	);