/*******************************************************************************
* Function Name : RenderScene
* Returns : true if no error occured
* Description : Main rendering loop function of the program. The shell will
* call this function every frame.
*******************************************************************************/
bool OGLESPolybump::RenderScene()
{
if(PVRShellIsKeyPressed(PVRShellKeyNameACTION1))
m_bDrawWithDot3 = !m_bDrawWithDot3;
PVRTVec4 LightVector;
PVRTMat4 mRotateY, mModelView;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
LightVector.x = PVRTSIN(m_i32Frame / 40.0f);
LightVector.y = 0.0f;
LightVector.z = -PVRTABS(PVRTCOS(m_i32Frame / 40.0f));
LightVector.w = 0.0f;
PVRTTransformBack(&LightVector, &LightVector, &m_mView);
// Normalize light vector in case it is not
LightVector.normalize();
if(m_bDrawWithDot3)
{
// Setup texture blend modes
// First layer (Dot3)
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_ui32CloneMap);
if(m_bCombinersPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_DOT3_RGB);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PREVIOUS);
}
else if(m_bIMGTextureFFExtPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DOT3_RGBA);
}
// Second layer (modulate)
glActiveTexture(GL_TEXTURE1);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_ui32DiffuseMap);
if(m_bCombinersPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PREVIOUS);
}
else if (m_bIMGTextureFFExtPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
// Calculate Dot3 light direction
CalculateDot3LightDirection(LightVector);
}
else
{
glActiveTexture(GL_TEXTURE0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_ui32DiffuseMap);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
LightVector.z = -LightVector.z;
glLightfv(GL_LIGHT0, GL_POSITION, &LightVector.x);
}
glMatrixMode(GL_MODELVIEW);
// Render mesh
SPODNode& Node = m_Scene.pNode[0];
// Rotate the mesh around a point
mModelView = m_mView * PVRTMat4::RotationY((float) sin(m_i32Frame * 0.003f) - PVRT_PI_OVER_TWOf);
glLoadMatrixf(mModelView.f);
DrawMesh(Node.nIdx);
// Disable the second layer of texturing
if(m_bDrawWithDot3)
{
glActiveTexture(GL_TEXTURE1);
glDisable(GL_TEXTURE_2D);
}
else
glDisable(GL_LIGHTING);
// Display info text
m_Print3D.DisplayDefaultTitle("PolyBump", m_bDrawWithDot3 ? m_pDescription : "Standard GL lighting" , ePVRTPrint3DSDKLogo);
m_Print3D.Flush();
// Increase frame counter
++m_i32Frame;
return true;
}
