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/**
* $Id$
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#include "RAS_FramingManager.h"
#include "RAS_Rect.h"
void
RAS_FramingManager::
ComputeDefaultFrustum(
const float camnear,
const float camfar,
const float lens,
const float design_aspect_ratio,
RAS_FrameFrustum & frustum
){
/*
* Magic Blender calculation.
* Blender does not give a Field of View as lens but a size
* at 16 units away from the lens.
*/
float halfSize = 16.f * camnear / lens;
float sizeX;
float sizeY;
if (design_aspect_ratio > 1.f) {
// halfsize defines the width
sizeX = halfSize;
sizeY = halfSize/design_aspect_ratio;
} else {
// halfsize defines the height
sizeX = halfSize * design_aspect_ratio;
sizeY = halfSize;
}
frustum.x2 = sizeX;
frustum.x1 = -frustum.x2;
frustum.y2 = sizeY;
frustum.y1 = -frustum.y2;
frustum.camnear = camnear;
frustum.camfar = camfar;
}
void
RAS_FramingManager::
ComputeBestFitViewRect(
const RAS_Rect &availableViewport,
const float design_aspect_ratio,
RAS_Rect &viewport
){
// try and honour the aspect ratio when setting the
// drawable area. If we don't do this we are liable
// to get a lot of distortion in the rendered image.
int width = availableViewport.GetWidth();
int height = availableViewport.GetHeight();
float window_aspect = float(width)/float(height);
if (window_aspect < design_aspect_ratio) {
int v_height = (int)(width / design_aspect_ratio);
int left_over = (height - v_height) / 2;
viewport.SetLeft(availableViewport.GetLeft());
viewport.SetBottom(availableViewport.GetBottom() + left_over);
viewport.SetRight(availableViewport.GetLeft() + width);
viewport.SetTop(availableViewport.GetBottom() + left_over + v_height);
} else {
int v_width = (int)(height * design_aspect_ratio);
int left_over = (width - v_width) / 2;
viewport.SetLeft(availableViewport.GetLeft() + left_over);
viewport.SetBottom(availableViewport.GetBottom());
viewport.SetRight(availableViewport.GetLeft() + v_width + left_over);
viewport.SetTop(availableViewport.GetBottom() + height);
}
}
void
RAS_FramingManager::
ComputeViewport(
const RAS_FrameSettings &settings,
const RAS_Rect &availableViewport,
RAS_Rect &viewport
){
RAS_FrameSettings::RAS_FrameType type = settings.FrameType();
const int winx = availableViewport.GetWidth();
const int winy = availableViewport.GetHeight();
const float design_width = float(settings.DesignAspectWidth());
const float design_height = float(settings.DesignAspectHeight());
float design_aspect_ratio = float(1);
if (design_height == float(0)) {
// well this is ill defined
// lets just scale the thing
type = RAS_FrameSettings::e_frame_scale;
} else {
design_aspect_ratio = design_width/design_height;
}
switch (type) {
case RAS_FrameSettings::e_frame_scale :
case RAS_FrameSettings::e_frame_extend:
{
viewport.SetLeft(availableViewport.GetLeft());
viewport.SetBottom(availableViewport.GetBottom());
viewport.SetRight(availableViewport.GetLeft() + int(winx));
viewport.SetTop(availableViewport.GetBottom() + int(winy));
break;
}
case RAS_FrameSettings::e_frame_bars:
{
ComputeBestFitViewRect(
availableViewport,
design_aspect_ratio,
viewport
);
break;
}
default :
break;
}
}
void
RAS_FramingManager::
ComputeFrustum(
const RAS_FrameSettings &settings,
const RAS_Rect &availableViewport,
const RAS_Rect &viewport,
const float lens,
const float camnear,
const float camfar,
RAS_FrameFrustum &frustum
){
const int winx = availableViewport.GetWidth();
const int winy = availableViewport.GetHeight();
RAS_FrameSettings::RAS_FrameType type = settings.FrameType();
const float design_width = float(settings.DesignAspectWidth());
const float design_height = float(settings.DesignAspectHeight());
float design_aspect_ratio = float(1);
if (design_height == float(0)) {
// well this is ill defined
// lets just scale the thing
type = RAS_FrameSettings::e_frame_scale;
} else {
design_aspect_ratio = design_width/design_height;
}
ComputeDefaultFrustum(
camnear,
camfar,
lens,
design_aspect_ratio,
frustum
);
switch (type) {
case RAS_FrameSettings::e_frame_extend:
{
RAS_Rect vt;
ComputeBestFitViewRect(
availableViewport,
design_aspect_ratio,
vt
);
// now scale the calculated frustum by the difference
// between vt and the viewport in each axis.
// These are always > 1
float x_scale = float(viewport.GetWidth())/float(vt.GetWidth());
float y_scale = float(viewport.GetHeight())/float(vt.GetHeight());
frustum.x1 *= x_scale;
frustum.x2 *= x_scale;
frustum.y1 *= y_scale;
frustum.y2 *= y_scale;
break;
}
case RAS_FrameSettings::e_frame_scale :
case RAS_FrameSettings::e_frame_bars:
default :
break;
}
}
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