void RenderManager::DrawTextPrivate()
{
if(enqueuedTextData.size() == 0)
return;
gRenderAPI->BeginPerfEvent("RenderText");
for(int fnt=0; fnt<FONT_MaxSupported; fnt++)
{
// Calculate number of quads to render
int numQuads = 0;
for(vector<TextRenderData>::const_iterator it=enqueuedTextData.begin(); it != enqueuedTextData.end(); it++)
{
if(it->useFont == fnt)
numQuads += it->text.length();
}
if(numQuads == 0)
continue;
// Create vertex buffer
VertexBuffer* textVB = gRenderAPI->CreateVertexBuffer(VFMT_P3C3U2, numQuads*4, NULL, true);
VertexContainer_P3C3U2* pData = (VertexContainer_P3C3U2*)textVB->Lock();
float fontHeightNDC, fontWidthNDC;
for(vector<TextRenderData>::const_iterator it=enqueuedTextData.begin(); it != enqueuedTextData.end(); it++)
{
const TextRenderData& data = *it;
if(data.useFont == fnt)
{
// Convert font height from pixel units to NDC units
fontHeightNDC = 2*data.size/fullScreenBufferSizeY;
// The current position of the render cursor
float renderCursorX = data.posX;
// Font used
BitmapFont* font = engineFonts[data.useFont];
// Font color
ColorVector color = data.color;
// Text to render
const string& renderText = data.text;
for(unsigned int i=0; i<renderText.length(); i++)
{
BitmapFont::CharDescriptor charData = font->GetData(renderText.at(i), data.bBold);
fontWidthNDC = charData.aspectRatio * fontHeightNDC;
pData->px = renderCursorX;
pData->py = data.posY;
pData->pz = 0.f;
pData->cx = color.r;
pData->cy = color.g;
pData->cz = color.b;
pData->u = charData.u1;
pData->v = charData.v1;
pData++;
pData->px = renderCursorX + fontWidthNDC;
pData->py = data.posY;
pData->pz = 0.f;
pData->cx = color.r;
pData->cy = color.g;
pData->cz = color.b;
pData->u = charData.u2;
pData->v = charData.v1;
pData++;
pData->px = renderCursorX + fontWidthNDC;
pData->py = data.posY - fontHeightNDC;
pData->pz = 0.f;
pData->cx = color.r;
pData->cy = color.g;
pData->cz = color.b;
pData->u = charData.u2;
pData->v = charData.v2;
pData++;
pData->px = renderCursorX;
pData->py = data.posY - fontHeightNDC;
pData->pz = 0.f;
pData->cx = color.r;
pData->cy = color.g;
pData->cz = color.b;
pData->u = charData.u1;
pData->v = charData.v2;
pData++;
renderCursorX += fontWidthNDC;
}
}
}
textVB->Unlock();
// Create index buffer
IndexBuffer* textIB = gRenderAPI->CreateIndexBuffer(IFMT_16Bit, numQuads*6, NULL, true);
short* iData = (short*)textIB->Lock();
int offset = 0;
for(unsigned int i=0; i<enqueuedTextData.size(); i++)
{
if(enqueuedTextData.at(i).useFont == fnt)
{
for(unsigned int j=0; j<enqueuedTextData.at(i).text.length(); j++)
{
*iData = offset + 4*j + 0; iData++;
*iData = offset + 4*j + 1; iData++;
*iData = offset + 4*j + 3; iData++;
*iData = offset + 4*j + 2; iData++;
*iData = offset + 4*j + 3; iData++;
*iData = offset + 4*j + 1; iData++;
}
offset += 4*enqueuedTextData.at(i).text.length();
}
}
textIB->Unlock();
// Vertex shader
VertexShader* vShader = gRenderManager.GetPassthroughShader(VFMT_P3C3U2, INTERPOLANT_MeshUV | INTERPOLANT_MeshColor);
vShader->Bind();
// Pixel shader
simpleFontPixelShader->SetValues(engineFonts[fnt]->GetTexture(), SamplerState::TrilinearWrap);
simpleFontPixelShader->Bind();
gRenderAPI->SetVertexBuffer(0, textVB);
gRenderAPI->SetIndexBuffer(textIB);
gRenderAPI->DrawIndexed(TOPOLOGY_TriangleList, numQuads*2);
// Clean up the buffers
gRenderAPI->DestroyVertexBuffer(textVB);
gRenderAPI->DestroyIndexBuffer(textIB);
}
gRenderAPI->EndPerfEvent();
}
