bgfx/examples/10-font/font.cpp

/*
 * Copyright 2013 Jeremie Roy. All rights reserved.
 * License: http://www.opensource.org/licenses/BSD-2-Clause
 */

#include <bgfx.h>
#include <bx/bx.h>
#include <bx/timer.h>
#include "../common/entry.h"
#include "../common/dbg.h"
#include "../common/math.h"
#include "../common/processevents.h"

#include "../common/font/font_manager.h"
#include "../common/font/text_buffer_manager.h"

#include <stdio.h>
#include <string.h>

int _main_(int /*_argc*/, char** /*_argv*/)
{
    uint32_t width = 1280;
	uint32_t height = 720;
	uint32_t debug = BGFX_DEBUG_TEXT;
	uint32_t reset = 0;

	bgfx::init();	

	bgfx::reset(width, height);

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

	// Set view 0 clear state.
	bgfx::setViewClear(0
		, BGFX_CLEAR_COLOR_BIT|BGFX_CLEAR_DEPTH_BIT
		, 0x303030ff		
		, 1.0f
		, 0
		);
			
	//init the text rendering system
	FontManager* fontManager = new FontManager(512);
	TextBufferManager* textBufferManager = new TextBufferManager(fontManager);

	//load some truetype files
	const char* fontNames[7] = {
		"font/droidsans.ttf",
		"font/chp-fire.ttf", 
		"font/bleeding_cowboys.ttf",
		"font/mias_scribblings.ttf",
		"font/ruritania.ttf",
		"font/signika-regular.ttf",
		"font/five_minutes.otf"
	};

	const uint32_t fontCount = sizeof(fontNames)/sizeof(const char*);
		
	TrueTypeHandle fontFiles[fontCount];
	FontHandle fonts[fontCount];
	for(int32_t  ii = 0; ii<fontCount ; ++ii)
	{
		//instantiate a usable font
		fontFiles[ii] = fontManager->loadTrueTypeFromFile(fontNames[ii]);
		fonts[ii] = fontManager->createFontByPixelSize(fontFiles[ii], 0, 32);
		//preload glyphs and blit them to atlas
		fontManager->preloadGlyph(fonts[ii], L"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ. \n");
		//You can unload the truetype files at this stage, but in that case, the set of glyph's will be limited to the set of preloaded glyph
		fontManager->unloadTrueType(fontFiles[ii]);
	}
	
	TrueTypeHandle console_tt = fontManager->loadTrueTypeFromFile("font/visitor1.ttf");

	//this font doesn't have any preloaded glyph's but the truetype file is loaded
	//so glyph will be generated as needed
	FontHandle consola_16 = fontManager->createFontByPixelSize(console_tt, 0, 10);
	
	//create a static text buffer compatible with alpha font
	//a static text buffer content cannot be modified after its first submit.
	TextBufferHandle staticText = textBufferManager->createTextBuffer(FONT_TYPE_ALPHA, STATIC);
	
	//the pen position represent the top left of the box of the first line of text
	textBufferManager->setPenPosition(staticText, 24.0f, 100.0f);

	for(int32_t  ii = 0; ii<fontCount ; ++ii)
	{
		//add some text to the buffer
		textBufferManager->appendText(staticText, fonts[ii], L"The quick brown fox jumps over the lazy dog\n");
		//the position of the pen is adjusted when there is an endline
	}

	// Now write some styled text		
		
	//setup style colors 
	textBufferManager->setBackgroundColor(staticText, 0x551111FF);
	textBufferManager->setUnderlineColor(staticText, 0xFF2222FF);
	textBufferManager->setOverlineColor(staticText, 0x2222FFFF);
	textBufferManager->setStrikeThroughColor(staticText, 0x22FF22FF);	

	//text + bkg
	textBufferManager->setStyle(staticText, STYLE_BACKGROUND);
	textBufferManager->appendText(staticText, fonts[0], L"The quick ");
	
	//text + strike-through
	textBufferManager->setStyle(staticText, STYLE_STRIKE_THROUGH);
	textBufferManager->appendText(staticText, fonts[0], L"brown fox ");
	
	//text + overline
	textBufferManager->setStyle(staticText, STYLE_OVERLINE);
	textBufferManager->appendText(staticText, fonts[0], L"jumps over ");

	//text + underline
	textBufferManager->setStyle(staticText, STYLE_UNDERLINE);
	textBufferManager->appendText(staticText, fonts[0], L"the lazy ");
	
	//text + bkg + strike-through
	textBufferManager->setStyle(staticText, STYLE_BACKGROUND|STYLE_STRIKE_THROUGH);
	textBufferManager->appendText(staticText, fonts[0], L"dog\n");
	
	
	//create a transient buffer for realtime data	
	TextBufferHandle transientText = textBufferManager->createTextBuffer(FONT_TYPE_ALPHA, TRANSIENT);	
			
	uint32_t w = 0,h = 0;
    while (!processEvents(width, height, debug, reset) )
	{
		
		if(w!=width|| h!=height)
		{
			w=width;
			h= height;
			printf("ri: %d,%d\n",width,height);
		}
		// Set view 0 default viewport.
		bgfx::setViewRect(0, 0, 0, width, 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::submit(0);

		int64_t now = bx::getHPCounter();
		static int64_t last = now;
		const int64_t frameTime = now - last;
		last = now;
		const double freq = double(bx::getHPFrequency() );
		const double toMs = 1000.0/freq;

		// Use debug font to print information about this example.
		//bgfx::dbgTextClear();
		//bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/10-font");
		//bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Use the font system to display text and styled text.");
		//bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
		
		//Use transient text to display debug information
		//Code below is similar to commented code above
		wchar_t fpsText[64];
		swprintf(fpsText,L"Frame: % 7.3f[ms]", double(frameTime)*toMs);
		
		textBufferManager->clearTextBuffer(transientText);
		textBufferManager->setPenPosition(transientText, 20.0, 4.0f);		
		textBufferManager->appendText(transientText, consola_16, L"bgfx/examples/10-font\n");		
		textBufferManager->appendText(transientText, consola_16, L"Description: Use the font system to display text and styled text.\n");
		textBufferManager->appendText(transientText, consola_16, fpsText);

		float at[3] = { 0, 0, 0.0f };
		float eye[3] = {0, 0, -1.0f };
		
		float view[16];
		float proj[16];
		mtxLookAt(view, eye, at);
		//setup a top-left ortho matrix for screen space drawing		
		float centering = 0.5f;
		mtxOrtho(proj, centering, width+centering,height+centering, centering,-1.0f, 1.0f);

		// Set view and projection matrix for view 0.
		bgfx::setViewTransform(0, view, proj);

		//submit the debug text
		textBufferManager->submitTextBuffer(transientText, 0);

		//submit the static text
		textBufferManager->submitTextBuffer(staticText, 0);	
				
        // Advance to next frame. Rendering thread will be kicked to 
		// process submitted rendering primitives.
		bgfx::frame();
	}
	
	
	fontManager->unloadTrueType(console_tt);
	//destroy the fonts
	fontManager->destroyFont(consola_16);	
	for(int32_t  ii = 0; ii<fontCount ; ++ii)
	{
		fontManager->destroyFont(fonts[ii]);
	}

	textBufferManager->destroyTextBuffer(staticText);
	textBufferManager->destroyTextBuffer(transientText);	

	delete textBufferManager;
	delete fontManager;	
	
	// Shutdown bgfx.
    bgfx::shutdown();

	return 0;
}