bgfx/examples/10-font/font.cpp

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#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();
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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
);
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//init the text rendering system
FontManager* fontManager = new FontManager(512);
TextBufferManager* textBufferManager = new TextBufferManager(fontManager);
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//load some truetype files
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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*);
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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");
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//this font doesn't have any preloaded glyph's but the truetype file is loaded
//so glyph will be generated as needed
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FontHandle consola_16 = fontManager->createFontByPixelSize(console_tt, 0, 10);
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//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);
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//the pen position represent the top left of the box of the first line of text
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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
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//setup style colors
textBufferManager->setBackgroundColor(staticText, 0x551111FF);
textBufferManager->setUnderlineColor(staticText, 0xFF2222FF);
textBufferManager->setOverlineColor(staticText, 0x2222FFFF);
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textBufferManager->setStrikeThroughColor(staticText, 0x22FF22FF);
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//text + bkg
textBufferManager->setStyle(staticText, STYLE_BACKGROUND);
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textBufferManager->appendText(staticText, fonts[0], L"The quick ");
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//text + strike-through
textBufferManager->setStyle(staticText, STYLE_STRIKE_THROUGH);
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textBufferManager->appendText(staticText, fonts[0], L"brown fox ");
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//text + overline
textBufferManager->setStyle(staticText, STYLE_OVERLINE);
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textBufferManager->appendText(staticText, fonts[0], L"jumps over ");
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//text + underline
textBufferManager->setStyle(staticText, STYLE_UNDERLINE);
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textBufferManager->appendText(staticText, fonts[0], L"the lazy ");
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//text + bkg + strike-through
textBufferManager->setStyle(staticText, STYLE_BACKGROUND|STYLE_STRIKE_THROUGH);
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textBufferManager->appendText(staticText, fonts[0], L"dog\n");
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//create a transient buffer for realtime data
TextBufferHandle transientText = textBufferManager->createTextBuffer(FONT_TYPE_ALPHA, TRANSIENT);
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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);
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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);
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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);
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//submit the static text
textBufferManager->submitTextBuffer(staticText, 0);
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// Advance to next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
bgfx::frame();
}
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fontManager->unloadTrueType(console_tt);
//destroy the fonts
fontManager->destroyFont(consola_16);
for(int32_t ii = 0; ii<fontCount ; ++ii)
{
fontManager->destroyFont(fonts[ii]);
}
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textBufferManager->destroyTextBuffer(staticText);
textBufferManager->destroyTextBuffer(transientText);
delete textBufferManager;
delete fontManager;
// Shutdown bgfx.
bgfx::shutdown();
return 0;
}