Method UpdateBuffer

Engine/source/EtRendering/SceneRendering/TextRenderer.cpp:260–342

--------------------------------- TextRenderer::UpdateBuffer Updates the vertex buffer containing font vertices

// Updates the vertex buffer containing font vertices
//
void TextRenderer::UpdateBuffer()
{
	std::vector<TextVertex> tVerts;

	for (QueuedFont& queued : m_QueuedFonts)
	{
		if (queued.m_IsAddedToRenderer)
		{
			queued.m_BufferStart = static_cast<int32>(tVerts.size() * (sizeof(TextVertex) / sizeof(float)));
			queued.m_BufferSize = 0;

			for (TextCache const& cache : queued.m_TextCache)
			{
				float const sizeMult = static_cast<float>(cache.Size) / static_cast<float>(queued.m_Font->GetFontSize());

				float totalAdvanceX = 0.f;
				char previous = 0;
				for (char const charId : cache.Text)
				{
					if (!SpriteFont::IsCharValid(charId))
					{
						LOG(FS("TextRenderer::UpdateBuffer > char '%c' not supported for current font", charId), core::LogLevel::Warning);
						continue;
					}

					FontMetric const& metric = queued.m_Font->GetMetric(charId);
					if (!metric.IsValid)
					{
						LOG(FS("TextRenderer::UpdateBuffer > char '%c' doesn't have a valid metric", charId), core::LogLevel::Warning);
						continue;
					}

					vec2 kerningVec = 0;
					if (queued.m_Font->m_UseKerning && m_bUseKerning)
					{
						kerningVec = metric.GetKerningVec(static_cast<wchar_t>(previous)) * sizeMult;
					}
					previous = charId;

					totalAdvanceX += kerningVec.x;

					if (charId == ' ')
					{
						totalAdvanceX += metric.AdvanceX;
						continue;
					}

					tVerts.push_back(TextVertex());
					TextVertex& vText = tVerts[tVerts.size()-1];

					vText.Position.x = cache.Position.x + (totalAdvanceX + metric.OffsetX)*sizeMult;
					vText.Position.y = cache.Position.y + (kerningVec.y + metric.OffsetY)*sizeMult;
					vText.Position.z = 0;
					vText.Color = cache.Color;
					vText.TexCoord = metric.TexCoord;
					vText.CharacterDimension = vec2(metric.Width, metric.Height);
					vText.SizeMult = sizeMult;
					vText.ChannelId = metric.Channel;