/*!***************************************************************************
@Function UpdateLine
@Description
*****************************************************************************/
unsigned int CPVRTPrint3D::UpdateLine(const float fZPos, float XPos, float YPos, const float fScale, const unsigned int Colour, const CPVRTArray<PVRTuint32>& Text, SPVRTPrint3DAPIVertex * const pVertices)
{
/* Nothing to update */
if (Text.GetSize() == 0)
return 0;
if(!m_bUsingProjection)
{
XPos *= m_fScreenScale[0];
YPos *= m_fScreenScale[1];
}
YPos -= PVRTMakeWhole(m_uiAscent * fScale);
float fPreXPos = XPos; // The original offset (after screen scale modification) of the X coordinate.
float fKernOffset;
float fAOff;
float fYOffset;
unsigned int VertexCount = 0;
PVRTint32 NextChar;
unsigned int uiNumCharsInString = Text.GetSize();
for(unsigned int uiIndex = 0; uiIndex < uiNumCharsInString; uiIndex++)
{
if(uiIndex > MAX_LETTERS)
break;
// Newline
if(Text[uiIndex] == 0x0A)
{
XPos = fPreXPos;
YPos -= PVRTMakeWhole(m_uiNextLineH * fScale);
continue;
}
// Get the character
PVRTuint32 uiIdx = FindCharacter(Text[uiIndex]);
// Not found. Add a space.
if(uiIdx == PVRTPRINT3D_INVALID_CHAR) // No character found. Add a space.
{
XPos += PVRTMakeWhole(m_uiSpaceWidth * fScale);
continue;
}
fKernOffset = 0;
fYOffset = PVRTMakeWhole(m_pYOffsets[uiIdx] * fScale);
fAOff = PVRTMakeWhole(m_pCharMatrics[uiIdx].nXOff * fScale); // The A offset. Could include overhang or underhang.
if(uiIndex < uiNumCharsInString - 1)
{
NextChar = Text[uiIndex + 1];
ApplyKerning(Text[uiIndex], NextChar, fKernOffset);
}
/* Filling vertex data */
pVertices[VertexCount+0].sx = f2vt(XPos + fAOff + 0.0f);
pVertices[VertexCount+0].sy = f2vt(YPos + fYOffset + 0.0f);
pVertices[VertexCount+0].sz = f2vt(fZPos);
pVertices[VertexCount+0].rhw = f2vt(1.0f);
pVertices[VertexCount+0].tu = f2vt(m_pUVs[uiIdx].fUL);
pVertices[VertexCount+0].tv = f2vt(m_pUVs[uiIdx].fVT);
pVertices[VertexCount+1].sx = f2vt(XPos + fAOff + PVRTMakeWhole(m_pRects[uiIdx].nW * fScale));
pVertices[VertexCount+1].sy = f2vt(YPos + fYOffset + 0.0f);
pVertices[VertexCount+1].sz = f2vt(fZPos);
pVertices[VertexCount+1].rhw = f2vt(1.0f);
pVertices[VertexCount+1].tu = f2vt(m_pUVs[uiIdx].fUR);
pVertices[VertexCount+1].tv = f2vt(m_pUVs[uiIdx].fVT);
pVertices[VertexCount+2].sx = f2vt(XPos + fAOff + 0.0f);
pVertices[VertexCount+2].sy = f2vt(YPos + fYOffset - PVRTMakeWhole(m_pRects[uiIdx].nH * fScale));
pVertices[VertexCount+2].sz = f2vt(fZPos);
pVertices[VertexCount+2].rhw = f2vt(1.0f);
pVertices[VertexCount+2].tu = f2vt(m_pUVs[uiIdx].fUL);
pVertices[VertexCount+2].tv = f2vt(m_pUVs[uiIdx].fVB);
pVertices[VertexCount+3].sx = f2vt(XPos + fAOff + PVRTMakeWhole(m_pRects[uiIdx].nW * fScale));
pVertices[VertexCount+3].sy = f2vt(YPos + fYOffset - PVRTMakeWhole(m_pRects[uiIdx].nH * fScale));
pVertices[VertexCount+3].sz = f2vt(fZPos);
pVertices[VertexCount+3].rhw = f2vt(1.0f);
pVertices[VertexCount+3].tu = f2vt(m_pUVs[uiIdx].fUR);
pVertices[VertexCount+3].tv = f2vt(m_pUVs[uiIdx].fVB);
pVertices[VertexCount+0].color = Colour;
pVertices[VertexCount+1].color = Colour;
pVertices[VertexCount+2].color = Colour;
pVertices[VertexCount+3].color = Colour;
XPos = XPos + PVRTMakeWhole((m_pCharMatrics[uiIdx].nAdv + fKernOffset) * fScale); // Add on this characters width
VertexCount += 4;
}
return VertexCount;
}
/*!***************************************************************************
@Function RenderText
@Description Draws the 3D text and scrolls in to the screen.
*****************************************************************************/
void OGLES2IntroducingPrint3D::RenderText()
{
float fAspect = (float)PVRShellGet(prefWidth) / (float)PVRShellGet(prefHeight);
bool bRotate = PVRShellGet(prefIsRotated) && PVRShellGet(prefFullScreen);
// Calculate the frame delta.
unsigned long ulNow = PVRShellGetTime();
if(m_ulPrevFrameT == 0) m_ulPrevFrameT = ulNow;
float fDT = (ulNow - m_ulPrevFrameT) * 0.001f;
m_ulPrevFrameT = ulNow;
// Calculate the FPS scale.
float fFPSScale = fDT / c_fTargetFPS;
// Move the text. Progressively speed up.
float fSpeedInc = 0.0f;
if(m_fTextOffset > 0.0f)
fSpeedInc = m_fTextOffset / TEXT_END_Y;
m_fTextOffset += (0.75f + (1.0f * fSpeedInc)) * fFPSScale;
if(m_fTextOffset > TEXT_END_Y)
m_fTextOffset = TEXT_START_Y;
PVRTMat4 mProjection = PVRTMat4::PerspectiveFovRH(0.7f, fAspect, 1.0f, 2000.0f, PVRTMat4::OGL, bRotate);
PVRTMat4 mScale = PVRTMat4::Scale(PVRTVec3(1.0f, -1.0f, 1.0f));
PVRTMat4 mCamera = PVRTMat4::LookAtRH(PVRTVec3(0.0f, -900.0f, 700.0f), PVRTVec3(0.0f,-200.0f,0.0f), PVRTVec3(0.0f,1.0f,0.0f));
PVRTMat4 mTrans = PVRTMat4::Translation(PVRTVec3(0.0f, m_fTextOffset, 0.0f));
PVRTMat4 mModelView = mCamera * mTrans;
float fStrWidth = 0.0f;
/*
Print3D can optionally be provided with user-defined projection and model-view matrices
which allow custom layout of text. Here we are proving both a projection and model-view
matrix. The projection matrix specified here uses perspective projection which will
provide the 3D effect. The model-view matrix positions the the text in world space
providing the 'camera' position and the scrolling of the text.
*/
m_CentralText.SetProjection(mProjection);
m_CentralText.SetModelView(mModelView);
/*
The previous method (RenderTitle()) explains the following functions in more detail
however put simply, we are looping the entire array of loaded text which is encoded
in UTF-8. Print3D batches this internally and the call to Flush() will render the
text to the frame buffer. We are also fading out the text over a certain distance.
*/
float fPos, fFade;
unsigned int uiCol;
for(unsigned int uiIndex = 0; uiIndex < m_TextLines.GetSize(); ++uiIndex)
{
fPos = (m_fTextOffset - (uiIndex * 36.0f));
fFade = 1.0f;
if(fPos > TEXT_FADE_START)
{
fFade = PVRTClamp(1.0f - ((fPos - TEXT_FADE_START) / (TEXT_FADE_END - TEXT_FADE_START)), 0.0f, 1.0f);
}
uiCol = (((unsigned int)(fFade * 255)) << 24) | 0x00FFFF;
m_CentralText.MeasureText(&fStrWidth, NULL, 1.0f, (const char*)m_TextLines[uiIndex]);
m_CentralText.Print3D(-(fStrWidth*0.5f), -(uiIndex * 36.0f), 1.0f, uiCol, (const char*)m_TextLines[uiIndex]);
}
m_CentralText.Flush();
}