2D Text Overlay on 3D Geometry Problem

[fuddish]

I'm having trouble getting static text to render along with 3D geometry using Direct3D 12 on Windows 10. I added a few blocks of code from example-10-font to example-01-cubes in attempt to get the text to overlay the rotating cubes. The code was copied and pasted verbatim with only the change of a couple of variable names to prevent compile ### errors.

The text renders exactly like in example-10-font but without the cubes if I used both blocks of code. If I comment out the second block of code added to ExampleCubes::update() then the cubes render exactly as expected but the text does not appear.

I suspect this is a transform/projection problem but I can't see a problem with those. Does anybody have any suggestions to get the text and the 3D geometry rendering at the same time?

Thanks in advance for any help!

========================================================

This is the block of code added to the very end of ExampleCubes::init()

{ // create static text

// Init the text rendering system.
m_fontManager = new FontManager(512);
m_textBufferManager = new TextBufferManager(m_fontManager);

// Load some TTF files.
for (uint32_t ii = 0; ii < numFonts; ++ii)
{
	// Instantiate a usable font.
	m_fontFiles[ii] = loadTtf(m_fontManager, s_fontFilePath[ii]);
	m_fonts[ii] = m_fontManager->createFontByPixelSize(m_fontFiles[ii], 0, 32);

	// Preload glyphs and blit them to atlas.
	m_fontManager->preloadGlyph(m_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.
	m_fontManager->destroyTtf(m_fontFiles[ii]);
}

m_fontAwesomeTtf = loadTtf(m_fontManager, "font/fontawesome-webfont.ttf");
m_fontKenneyTtf = loadTtf(m_fontManager, "font/kenney-icon-font.ttf");

// This font doesn't have any preloaded glyph's but the truetype file
// is loaded so glyph will be generated as needed.
m_fontAwesome72 = m_fontManager->createFontByPixelSize(m_fontAwesomeTtf, 0, 72);
m_fontKenney64 = m_fontManager->createFontByPixelSize(m_fontKenneyTtf, 0, 64);

m_visitorTtf = loadTtf(m_fontManager, "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.
m_visitor10 = m_fontManager->createFontByPixelSize(m_visitorTtf, 0, 10);

//create a static text buffer compatible with alpha font
//a static text buffer content cannot be modified after its first submit.
m_staticText = m_textBufferManager->createTextBuffer(FONT_TYPE_ALPHA, BufferType::Static);

// The pen position represent the top left of the box of the first line
// of text.
m_textBufferManager->setPenPosition(m_staticText, 24.0f, 100.0f);

for (uint32_t ii = 0; ii < numFonts; ++ii)
{
	// Add some text to the buffer.
	// The position of the pen is adjusted when there is an endline.
	m_textBufferManager->appendText(m_staticText, m_fonts[ii], L"The quick brown fox jumps over the lazy dog\n");
}

// Now write some styled text.

// Setup style colors.
m_textBufferManager->setBackgroundColor(m_staticText, 0x551111ff);
m_textBufferManager->setUnderlineColor(m_staticText, 0xff2222ff);
m_textBufferManager->setOverlineColor(m_staticText, 0x2222ffff);
m_textBufferManager->setStrikeThroughColor(m_staticText, 0x22ff22ff);

// Background.
m_textBufferManager->setStyle(m_staticText, STYLE_BACKGROUND);
m_textBufferManager->appendText(m_staticText, m_fonts[0], L"The quick ");

// Strike-through.
m_textBufferManager->setStyle(m_staticText, STYLE_STRIKE_THROUGH);
m_textBufferManager->appendText(m_staticText, m_fonts[0], L"brown fox ");

// Overline.
m_textBufferManager->setStyle(m_staticText, STYLE_OVERLINE);
m_textBufferManager->appendText(m_staticText, m_fonts[0], L"jumps over ");

// Underline.
m_textBufferManager->setStyle(m_staticText, STYLE_UNDERLINE);
m_textBufferManager->appendText(m_staticText, m_fonts[0], L"the lazy ");

// Background + strike-through.
m_textBufferManager->setStyle(m_staticText, STYLE_BACKGROUND | STYLE_STRIKE_THROUGH);
m_textBufferManager->appendText(m_staticText, m_fonts[0], L"dog\n");

m_textBufferManager->setStyle(m_staticText, STYLE_NORMAL);
m_textBufferManager->appendText(m_staticText, m_fontAwesome72,
	" " ICON_FA_POWER_OFF
	" " ICON_FA_TWITTER_SQUARE
	" " ICON_FA_CERTIFICATE
	" " ICON_FA_FLOPPY_O
	" " ICON_FA_GITHUB
	" " ICON_FA_GITHUB_ALT
	"\n"
);
m_textBufferManager->appendText(m_staticText, m_fontKenney64,
	" " ICON_KI_COMPUTER
	" " ICON_KI_JOYSTICK
	" " ICON_KI_EXLAMATION
	" " ICON_KI_STAR
	" " ICON_KI_BUTTON_START
	" " ICON_KI_DOWNLOAD
	"\n"
);

}

This is the block of code added just before bgfx::frame() near the end of ExampleCubes::update()

{ // render the static text

const bx::Vec3 at1 = { 0.0f, 0.0f,  0.0f };
const bx::Vec3 eye1 = { 0.0f, 0.0f, -1.0f };

float view[16];
bx::mtxLookAt(view, eye1, at1);

const float centering = 0.5f;

// Setup a top-left ortho matrix for screen space drawing.
const bgfx::Caps* caps = bgfx::getCaps();
{
    float ortho[16];
    bx::mtxOrtho(
        ortho
        , centering
        , m_width + centering
        , m_height + centering
        , centering
        , 0.0f
        , 100.0f
        , 0.0f
        , caps->homogeneousDepth
    );
    bgfx::setViewTransform(0, view, ortho);
    bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height));
}

// Submit the static text.
m_textBufferManager->submitTextBuffer(m_staticText, 0);

}

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

[fuddish]

I just figured out the problem. I was using view ID 0 for both the text and the geometry. It works fine if I use view ID 1 for the text.