// glu based camera functionality
void CCCameraBase::GluPerspective(float fovy, float aspect)
{
frustumMax.y = zNear * tanf( fovy * CC_PI / 360.0f );
frustumMin.y = -frustumMax.y;
frustumMin.x = frustumMin.y * aspect;
frustumMax.x = frustumMax.y * aspect;
const float zNearScale = 1.0f / zNear;
frustumSize.width = ( frustumMax.x + -frustumMin.x ) * zNearScale;
frustumSize.height = ( frustumMax.y + -frustumMin.y ) * zNearScale;
if( gEngine->renderer->openGL2() )
{
CCMatrixLoadIdentity( projectionMatrix );
CCMatrixFrustum( projectionMatrix, frustumMin.x, frustumMax.x, frustumMin.y, frustumMax.y, zNear, zFar );
}
else
{
#ifdef IOS
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustumf( frustumMin.x, frustumMax.x, frustumMin.y, frustumMax.y, zNear, zFar );
glGetFloatv( GL_PROJECTION_MATRIX, projectionMatrix.data() );
#endif
}
}
void CCMatrixPerspective(CCMatrix &result, float fovy, float aspect, float nearZ, float farZ)
{
float frustumW, frustumH;
frustumH = tanf( fovy / 360.0f * CC_PI ) * nearZ;
frustumW = frustumH * aspect;
CCMatrixFrustum( result, -frustumW, frustumW, -frustumH, frustumH, nearZ, farZ );
}
// glu based camera functionality
void CCCameraBase::GluPerspective(float fovy, float aspect)
{
frustumMax.y = zNear * tanf( fovy * CC_PI / 360.0f );
frustumMin.y = -frustumMax.y;
frustumMin.x = frustumMin.y * aspect;
frustumMax.x = frustumMax.y * aspect;
const float zNearScale = 1.0f / zNear;
frustumSize.width = ( frustumMax.x + -frustumMin.x ) * zNearScale;
frustumSize.height = ( frustumMax.y + -frustumMin.y ) * zNearScale;
CCMatrixLoadIdentity( projectionMatrix );
CCMatrixFrustum( projectionMatrix, frustumMin.x, frustumMax.x, frustumMin.y, frustumMax.y, zNear, zFar );
}
