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blender/source/gameengine/VideoTexture/ImageRender.cpp

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/*
* ***** BEGIN GPL 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (c) 2007 The Zdeno Ash Miklas
*
* This source file is part of VideoTexture library
*
* Contributor(s):
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file gameengine/VideoTexture/ImageRender.cpp
* \ingroup bgevideotex
*/
// implementation
#include "PyObjectPlus.h"
#include <structmember.h>
#include <float.h>
#include <math.h>
#include "GL/glew.h"
#include "KX_PythonInit.h"
#include "DNA_scene_types.h"
#include "RAS_CameraData.h"
#include "RAS_MeshObject.h"
#include "BLI_math.h"
#include "ImageRender.h"
#include "ImageBase.h"
#include "BlendType.h"
#include "Exception.h"
#include "Texture.h"
ExceptionID SceneInvalid, CameraInvalid, ObserverInvalid;
ExceptionID MirrorInvalid, MirrorSizeInvalid, MirrorNormalInvalid, MirrorHorizontal, MirrorTooSmall;
ExpDesc SceneInvalidDesc(SceneInvalid, "Scene object is invalid");
ExpDesc CameraInvalidDesc(CameraInvalid, "Camera object is invalid");
ExpDesc ObserverInvalidDesc(ObserverInvalid, "Observer object is invalid");
ExpDesc MirrorInvalidDesc(MirrorInvalid, "Mirror object is invalid");
ExpDesc MirrorSizeInvalidDesc(MirrorSizeInvalid, "Mirror has no vertex or no size");
ExpDesc MirrorNormalInvalidDesc(MirrorNormalInvalid, "Cannot determine mirror plane");
ExpDesc MirrorHorizontalDesc(MirrorHorizontal, "Mirror is horizontal in local space");
ExpDesc MirrorTooSmallDesc(MirrorTooSmall, "Mirror is too small");
// constructor
ImageRender::ImageRender (KX_Scene *scene, KX_Camera * camera) :
ImageViewport(),
m_render(true),
m_scene(scene),
m_camera(camera),
m_owncamera(false),
m_observer(NULL),
m_mirror(NULL),
m_clip(100.f),
m_mirrorHalfWidth(0.f),
m_mirrorHalfHeight(0.f)
{
// initialize background color
setBackground(0, 0, 255, 255);
// retrieve rendering objects
m_engine = KX_GetActiveEngine();
m_rasterizer = m_engine->GetRasterizer();
m_canvas = m_engine->GetCanvas();
}
// destructor
ImageRender::~ImageRender (void)
{
if (m_owncamera)
m_camera->Release();
}
// set background color
void ImageRender::setBackground (int red, int green, int blue, int alpha)
{
m_background[0] = (red < 0) ? 0.f : (red > 255) ? 1.f : float(red)/255.f;
m_background[1] = (green < 0) ? 0.f : (green > 255) ? 1.f : float(green)/255.f;
m_background[2] = (blue < 0) ? 0.f : (blue > 255) ? 1.f : float(blue)/255.f;
m_background[3] = (alpha < 0) ? 0.f : (alpha > 255) ? 1.f : float(alpha)/255.f;
}
// capture image from viewport
void ImageRender::calcImage (unsigned int texId, double ts)
{
if (m_rasterizer->GetDrawingMode() != RAS_IRasterizer::KX_TEXTURED || // no need for texture
m_camera->GetViewport() || // camera must be inactive
m_camera == m_scene->GetActiveCamera())
{
// no need to compute texture in non texture rendering
m_avail = false;
return;
}
// render the scene from the camera
Render();
// get image from viewport
ImageViewport::calcImage(texId, ts);
// restore OpenGL state
m_canvas->EndFrame();
}
void ImageRender::Render()
{
RAS_FrameFrustum frustrum;
if (!m_render)
return;
if (m_mirror)
{
// mirror mode, compute camera frustrum, position and orientation
// convert mirror position and normal in world space
const MT_Matrix3x3 & mirrorObjWorldOri = m_mirror->GetSGNode()->GetWorldOrientation();
const MT_Point3 & mirrorObjWorldPos = m_mirror->GetSGNode()->GetWorldPosition();
const MT_Vector3 & mirrorObjWorldScale = m_mirror->GetSGNode()->GetWorldScaling();
MT_Point3 mirrorWorldPos =
mirrorObjWorldPos + mirrorObjWorldScale * (mirrorObjWorldOri * m_mirrorPos);
MT_Vector3 mirrorWorldZ = mirrorObjWorldOri * m_mirrorZ;
// get observer world position
const MT_Point3 & observerWorldPos = m_observer->GetSGNode()->GetWorldPosition();
// get plane D term = mirrorPos . normal
MT_Scalar mirrorPlaneDTerm = mirrorWorldPos.dot(mirrorWorldZ);
// compute distance of observer to mirror = D - observerPos . normal
MT_Scalar observerDistance = mirrorPlaneDTerm - observerWorldPos.dot(mirrorWorldZ);
// if distance < 0.01 => observer is on wrong side of mirror, don't render
if (observerDistance < 0.01)
return;
// set camera world position = observerPos + normal * 2 * distance
MT_Point3 cameraWorldPos = observerWorldPos + (MT_Scalar(2.0)*observerDistance)*mirrorWorldZ;
m_camera->GetSGNode()->SetLocalPosition(cameraWorldPos);
// set camera orientation: z=normal, y=mirror_up in world space, x= y x z
MT_Vector3 mirrorWorldY = mirrorObjWorldOri * m_mirrorY;
MT_Vector3 mirrorWorldX = mirrorObjWorldOri * m_mirrorX;
MT_Matrix3x3 cameraWorldOri(
mirrorWorldX[0], mirrorWorldY[0], mirrorWorldZ[0],
mirrorWorldX[1], mirrorWorldY[1], mirrorWorldZ[1],
mirrorWorldX[2], mirrorWorldY[2], mirrorWorldZ[2]);
m_camera->GetSGNode()->SetLocalOrientation(cameraWorldOri);
m_camera->GetSGNode()->UpdateWorldData(0.0);
// compute camera frustrum:
// get position of mirror relative to camera: offset = mirrorPos-cameraPos
MT_Vector3 mirrorOffset = mirrorWorldPos - cameraWorldPos;
// convert to camera orientation
mirrorOffset = mirrorOffset * cameraWorldOri;
// scale mirror size to world scale:
// get closest local axis for mirror Y and X axis and scale height and width by local axis scale
MT_Scalar x, y;
x = fabs(m_mirrorY[0]);
y = fabs(m_mirrorY[1]);
float height = (x > y) ?
((x > fabs(m_mirrorY[2])) ? mirrorObjWorldScale[0] : mirrorObjWorldScale[2]):
((y > fabs(m_mirrorY[2])) ? mirrorObjWorldScale[1] : mirrorObjWorldScale[2]);
x = fabs(m_mirrorX[0]);
y = fabs(m_mirrorX[1]);
float width = (x > y) ?
((x > fabs(m_mirrorX[2])) ? mirrorObjWorldScale[0] : mirrorObjWorldScale[2]):
((y > fabs(m_mirrorX[2])) ? mirrorObjWorldScale[1] : mirrorObjWorldScale[2]);
width *= m_mirrorHalfWidth;
height *= m_mirrorHalfHeight;
// left = offsetx-width
// right = offsetx+width
// top = offsety+height
// bottom = offsety-height
// near = -offsetz
// far = near+100
frustrum.x1 = mirrorOffset[0]-width;
frustrum.x2 = mirrorOffset[0]+width;
frustrum.y1 = mirrorOffset[1]-height;
frustrum.y2 = mirrorOffset[1]+height;
frustrum.camnear = -mirrorOffset[2];
frustrum.camfar = -mirrorOffset[2]+m_clip;
}
// Store settings to be restored later
const RAS_IRasterizer::StereoMode stereomode = m_rasterizer->GetStereoMode();
RAS_Rect area = m_canvas->GetWindowArea();
// The screen area that ImageViewport will copy is also the rendering zone
m_canvas->SetViewPort(m_position[0], m_position[1], m_position[0]+m_capSize[0]-1, m_position[1]+m_capSize[1]-1);
m_canvas->ClearColor(m_background[0], m_background[1], m_background[2], m_background[3]);
m_canvas->ClearBuffer(RAS_ICanvas::COLOR_BUFFER|RAS_ICanvas::DEPTH_BUFFER);
m_rasterizer->BeginFrame(RAS_IRasterizer::KX_TEXTURED,m_engine->GetClockTime());
m_engine->SetWorldSettings(m_scene->GetWorldInfo());
m_rasterizer->SetAuxilaryClientInfo(m_scene);
m_rasterizer->DisplayFog();
// matrix calculation, don't apply any of the stereo mode
m_rasterizer->SetStereoMode(RAS_IRasterizer::RAS_STEREO_NOSTEREO);
if (m_mirror)
{
// frustrum was computed above
// get frustrum matrix and set projection matrix
MT_Matrix4x4 projmat = m_rasterizer->GetFrustumMatrix(
frustrum.x1, frustrum.x2, frustrum.y1, frustrum.y2, frustrum.camnear, frustrum.camfar);
m_camera->SetProjectionMatrix(projmat);
}
else if (m_camera->hasValidProjectionMatrix()) {
m_rasterizer->SetProjectionMatrix(m_camera->GetProjectionMatrix());
}
else {
float lens = m_camera->GetLens();
float sensor_x = m_camera->GetSensorWidth();
float sensor_y = m_camera->GetSensorHeight();
bool orthographic = !m_camera->GetCameraData()->m_perspective;
float nearfrust = m_camera->GetCameraNear();
float farfrust = m_camera->GetCameraFar();
float aspect_ratio = 1.0f;
Scene *blenderScene = m_scene->GetBlenderScene();
MT_Matrix4x4 projmat;
// compute the aspect ratio from frame blender scene settings so that render to texture
// works the same in Blender and in Blender player
if (blenderScene->r.ysch != 0)
aspect_ratio = float(blenderScene->r.xsch*blenderScene->r.xasp) / float(blenderScene->r.ysch*blenderScene->r.yasp);
if (orthographic) {
RAS_FramingManager::ComputeDefaultOrtho(
nearfrust,
farfrust,
m_camera->GetScale(),
aspect_ratio,
m_camera->GetSensorFit(),
frustrum
);
projmat = m_rasterizer->GetOrthoMatrix(
frustrum.x1, frustrum.x2, frustrum.y1, frustrum.y2, frustrum.camnear, frustrum.camfar);
}
else {
RAS_FramingManager::ComputeDefaultFrustum(
nearfrust,
farfrust,
lens,
sensor_x,
sensor_y,
RAS_SENSORFIT_AUTO,
aspect_ratio,
frustrum);
projmat = m_rasterizer->GetFrustumMatrix(
frustrum.x1, frustrum.x2, frustrum.y1, frustrum.y2, frustrum.camnear, frustrum.camfar);
}
m_camera->SetProjectionMatrix(projmat);
}
MT_Transform camtrans(m_camera->GetWorldToCamera());
MT_Matrix4x4 viewmat(camtrans);
m_rasterizer->SetViewMatrix(viewmat, m_camera->NodeGetWorldOrientation(), m_camera->NodeGetWorldPosition(), m_camera->GetCameraData()->m_perspective);
m_camera->SetModelviewMatrix(viewmat);
// restore the stereo mode now that the matrix is computed
m_rasterizer->SetStereoMode(stereomode);
m_scene->CalculateVisibleMeshes(m_rasterizer,m_camera);
m_scene->RenderBuckets(camtrans, m_rasterizer);
m_scene->RenderFonts();
// restore the canvas area now that the render is completed
m_canvas->GetWindowArea() = area;
}
// cast Image pointer to ImageRender
inline ImageRender * getImageRender (PyImage *self)
{ return static_cast<ImageRender*>(self->m_image); }
// python methods
// Blender Scene type
static BlendType<KX_Scene> sceneType ("KX_Scene");
// Blender Camera type
static BlendType<KX_Camera> cameraType ("KX_Camera");
// object initialization
static int ImageRender_init(PyObject *pySelf, PyObject *args, PyObject *kwds)
{
// parameters - scene object
PyObject *scene;
// camera object
PyObject *camera;
// parameter keywords
static const char *kwlist[] = {"sceneObj", "cameraObj", NULL};
// get parameters
if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO",
const_cast<char**>(kwlist), &scene, &camera))
return -1;
try
{
// get scene pointer
KX_Scene * scenePtr (NULL);
if (scene != NULL) scenePtr = sceneType.checkType(scene);
// throw exception if scene is not available
if (scenePtr == NULL) THRWEXCP(SceneInvalid, S_OK);
// get camera pointer
KX_Camera * cameraPtr (NULL);
if (camera != NULL) cameraPtr = cameraType.checkType(camera);
// throw exception if camera is not available
if (cameraPtr == NULL) THRWEXCP(CameraInvalid, S_OK);
// get pointer to image structure
PyImage *self = reinterpret_cast<PyImage*>(pySelf);
// create source object
if (self->m_image != NULL) delete self->m_image;
self->m_image = new ImageRender(scenePtr, cameraPtr);
}
catch (Exception & exp)
{
exp.report();
return -1;
}
// initialization succeded
return 0;
}
// get background color
static PyObject *getBackground (PyImage *self, void *closure)
{
return Py_BuildValue("[BBBB]",
getImageRender(self)->getBackground(0),
getImageRender(self)->getBackground(1),
getImageRender(self)->getBackground(2),
getImageRender(self)->getBackground(3));
}
// set color
static int setBackground(PyImage *self, PyObject *value, void *closure)
{
// check validity of parameter
if (value == NULL || !PySequence_Check(value) || PySequence_Size(value) != 4
|| !PyLong_Check(PySequence_Fast_GET_ITEM(value, 0))
|| !PyLong_Check(PySequence_Fast_GET_ITEM(value, 1))
|| !PyLong_Check(PySequence_Fast_GET_ITEM(value, 2))
|| !PyLong_Check(PySequence_Fast_GET_ITEM(value, 3)))
{
PyErr_SetString(PyExc_TypeError, "The value must be a sequence of 4 integer between 0 and 255");
return -1;
}
// set background color
getImageRender(self)->setBackground(
(unsigned char)(PyLong_AsLong(PySequence_Fast_GET_ITEM(value, 0))),
(unsigned char)(PyLong_AsLong(PySequence_Fast_GET_ITEM(value, 1))),
(unsigned char)(PyLong_AsLong(PySequence_Fast_GET_ITEM(value, 2))),
(unsigned char)(PyLong_AsLong(PySequence_Fast_GET_ITEM(value, 3))));
// success
return 0;
}
// methods structure
static PyMethodDef imageRenderMethods[] =
{ // methods from ImageBase class
{"refresh", (PyCFunction)Image_refresh, METH_NOARGS, "Refresh image - invalidate its current content"},
{NULL}
};
// attributes structure
static PyGetSetDef imageRenderGetSets[] =
{
{(char*)"background", (getter)getBackground, (setter)setBackground, (char*)"background color", NULL},
// attribute from ImageViewport
{(char*)"capsize", (getter)ImageViewport_getCaptureSize, (setter)ImageViewport_setCaptureSize, (char*)"size of render area", NULL},
{(char*)"alpha", (getter)ImageViewport_getAlpha, (setter)ImageViewport_setAlpha, (char*)"use alpha in texture", NULL},
{(char*)"whole", (getter)ImageViewport_getWhole, (setter)ImageViewport_setWhole, (char*)"use whole viewport to render", NULL},
// attributes from ImageBase class
{(char*)"valid", (getter)Image_valid, NULL, (char*)"bool to tell if an image is available", NULL},
{(char*)"image", (getter)Image_getImage, NULL, (char*)"image data", NULL},
{(char*)"size", (getter)Image_getSize, NULL, (char*)"image size", NULL},
{(char*)"scale", (getter)Image_getScale, (setter)Image_setScale, (char*)"fast scale of image (near neighbor)", NULL},
{(char*)"flip", (getter)Image_getFlip, (setter)Image_setFlip, (char*)"flip image vertically", NULL},
{(char*)"zbuff", (getter)Image_getZbuff, (setter)Image_setZbuff, (char*)"use depth buffer as texture", NULL},
{(char*)"depth", (getter)Image_getDepth, (setter)Image_setDepth, (char*)"get depth information from z-buffer using unsigned int precision", NULL},
{(char*)"filter", (getter)Image_getFilter, (setter)Image_setFilter, (char*)"pixel filter", NULL},
{NULL}
};
// define python type
PyTypeObject ImageRenderType = {
PyVarObject_HEAD_INIT(NULL, 0)
"VideoTexture.ImageRender", /*tp_name*/
sizeof(PyImage), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)Image_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
&imageBufferProcs, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
"Image source from render", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
imageRenderMethods, /* tp_methods */
0, /* tp_members */
imageRenderGetSets, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)ImageRender_init, /* tp_init */
0, /* tp_alloc */
Image_allocNew, /* tp_new */
};
// object initialization
static int ImageMirror_init(PyObject *pySelf, PyObject *args, PyObject *kwds)
{
// parameters - scene object
PyObject *scene;
// reference object for mirror
PyObject *observer;
// object holding the mirror
PyObject *mirror;
// material of the mirror
short materialID = 0;
// parameter keywords
static const char *kwlist[] = {"scene", "observer", "mirror", "material", NULL};
// get parameters
if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOO|h",
const_cast<char**>(kwlist), &scene, &observer, &mirror, &materialID))
return -1;
try
{
// get scene pointer
KX_Scene * scenePtr (NULL);
if (scene != NULL && PyObject_TypeCheck(scene, &KX_Scene::Type))
scenePtr = static_cast<KX_Scene*>BGE_PROXY_REF(scene);
else
THRWEXCP(SceneInvalid, S_OK);
if (scenePtr==NULL) /* in case the python proxy reference is invalid */
THRWEXCP(SceneInvalid, S_OK);
// get observer pointer
KX_GameObject * observerPtr (NULL);
if (observer != NULL && PyObject_TypeCheck(observer, &KX_GameObject::Type))
observerPtr = static_cast<KX_GameObject*>BGE_PROXY_REF(observer);
else if (observer != NULL && PyObject_TypeCheck(observer, &KX_Camera::Type))
observerPtr = static_cast<KX_Camera*>BGE_PROXY_REF(observer);
else
THRWEXCP(ObserverInvalid, S_OK);
if (observerPtr==NULL) /* in case the python proxy reference is invalid */
THRWEXCP(ObserverInvalid, S_OK);
// get mirror pointer
KX_GameObject * mirrorPtr (NULL);
if (mirror != NULL && PyObject_TypeCheck(mirror, &KX_GameObject::Type))
mirrorPtr = static_cast<KX_GameObject*>BGE_PROXY_REF(mirror);
else
THRWEXCP(MirrorInvalid, S_OK);
if (mirrorPtr==NULL) /* in case the python proxy reference is invalid */
THRWEXCP(MirrorInvalid, S_OK);
// locate the material in the mirror
RAS_IPolyMaterial * material = getMaterial(mirror, materialID);
if (material == NULL)
THRWEXCP(MaterialNotAvail, S_OK);
// get pointer to image structure
PyImage *self = reinterpret_cast<PyImage*>(pySelf);
// create source object
if (self->m_image != NULL)
{
delete self->m_image;
self->m_image = NULL;
}
self->m_image = new ImageRender(scenePtr, observerPtr, mirrorPtr, material);
}
catch (Exception & exp)
{
exp.report();
return -1;
}
// initialization succeded
return 0;
}
// get background color
static PyObject *getClip (PyImage *self, void *closure)
{
return PyFloat_FromDouble(getImageRender(self)->getClip());
}
// set clip
static int setClip(PyImage *self, PyObject *value, void *closure)
{
// check validity of parameter
double clip;
if (value == NULL || !PyFloat_Check(value) || (clip = PyFloat_AsDouble(value)) < 0.01 || clip > 5000.0)
{
PyErr_SetString(PyExc_TypeError, "The value must be an float between 0.01 and 5000");
return -1;
}
// set background color
getImageRender(self)->setClip(float(clip));
// success
return 0;
}
// attributes structure
static PyGetSetDef imageMirrorGetSets[] =
{
{(char*)"clip", (getter)getClip, (setter)setClip, (char*)"clipping distance", NULL},
// attribute from ImageRender
{(char*)"background", (getter)getBackground, (setter)setBackground, (char*)"background color", NULL},
// attribute from ImageViewport
{(char*)"capsize", (getter)ImageViewport_getCaptureSize, (setter)ImageViewport_setCaptureSize, (char*)"size of render area", NULL},
{(char*)"alpha", (getter)ImageViewport_getAlpha, (setter)ImageViewport_setAlpha, (char*)"use alpha in texture", NULL},
{(char*)"whole", (getter)ImageViewport_getWhole, (setter)ImageViewport_setWhole, (char*)"use whole viewport to render", NULL},
// attributes from ImageBase class
{(char*)"valid", (getter)Image_valid, NULL, (char*)"bool to tell if an image is available", NULL},
{(char*)"image", (getter)Image_getImage, NULL, (char*)"image data", NULL},
{(char*)"size", (getter)Image_getSize, NULL, (char*)"image size", NULL},
{(char*)"scale", (getter)Image_getScale, (setter)Image_setScale, (char*)"fast scale of image (near neighbor)", NULL},
{(char*)"flip", (getter)Image_getFlip, (setter)Image_setFlip, (char*)"flip image vertically", NULL},
{(char*)"zbuff", (getter)Image_getZbuff, (setter)Image_setZbuff, (char*)"use depth buffer as texture", NULL},
{(char*)"depth", (getter)Image_getDepth, (setter)Image_setDepth, (char*)"get depth information from z-buffer using unsigned int precision", NULL},
{(char*)"filter", (getter)Image_getFilter, (setter)Image_setFilter, (char*)"pixel filter", NULL},
{NULL}
};
// constructor
ImageRender::ImageRender (KX_Scene *scene, KX_GameObject *observer, KX_GameObject *mirror, RAS_IPolyMaterial *mat) :
ImageViewport(),
m_render(false),
m_scene(scene),
m_observer(observer),
m_mirror(mirror),
m_clip(100.f)
{
// this constructor is used for automatic planar mirror
// create a camera, take all data by default, in any case we will recompute the frustrum on each frame
RAS_CameraData camdata;
vector<RAS_TexVert*> mirrorVerts;
vector<RAS_TexVert*>::iterator it;
float mirrorArea = 0.f;
float mirrorNormal[3] = {0.f, 0.f, 0.f};
float mirrorUp[3];
float dist, vec[3], axis[3];
float zaxis[3] = {0.f, 0.f, 1.f};
float yaxis[3] = {0.f, 1.f, 0.f};
float mirrorMat[3][3];
float left, right, top, bottom, back;
// make sure this camera will delete its node
m_camera= new KX_Camera(scene, KX_Scene::m_callbacks, camdata, true, true);
m_camera->SetName("__mirror__cam__");
// don't add the camera to the scene object list, it doesn't need to be accessible
m_owncamera = true;
// retrieve rendering objects
m_engine = KX_GetActiveEngine();
m_rasterizer = m_engine->GetRasterizer();
m_canvas = m_engine->GetCanvas();
// locate the vertex assigned to mat and do following calculation in mesh coordinates
for (int meshIndex = 0; meshIndex < mirror->GetMeshCount(); meshIndex++)
{
RAS_MeshObject* mesh = mirror->GetMesh(meshIndex);
int numPolygons = mesh->NumPolygons();
for (int polygonIndex=0; polygonIndex < numPolygons; polygonIndex++)
{
RAS_Polygon* polygon = mesh->GetPolygon(polygonIndex);
if (polygon->GetMaterial()->GetPolyMaterial() == mat)
{
RAS_TexVert *v1, *v2, *v3, *v4;
float normal[3];
float area;
// this polygon is part of the mirror,
v1 = polygon->GetVertex(0);
v2 = polygon->GetVertex(1);
v3 = polygon->GetVertex(2);
mirrorVerts.push_back(v1);
mirrorVerts.push_back(v2);
mirrorVerts.push_back(v3);
if (polygon->VertexCount() == 4) {
v4 = polygon->GetVertex(3);
mirrorVerts.push_back(v4);
area = normal_quad_v3(normal,(float*)v1->getXYZ(), (float*)v2->getXYZ(), (float*)v3->getXYZ(), (float*)v4->getXYZ());
}
else {
area = normal_tri_v3(normal,(float*)v1->getXYZ(), (float*)v2->getXYZ(), (float*)v3->getXYZ());
}
area = fabs(area);
mirrorArea += area;
mul_v3_fl(normal, area);
add_v3_v3v3(mirrorNormal, mirrorNormal, normal);
}
}
}
if (mirrorVerts.size() == 0 || mirrorArea < FLT_EPSILON)
{
// no vertex or zero size mirror
THRWEXCP(MirrorSizeInvalid, S_OK);
}
// compute average normal of mirror faces
mul_v3_fl(mirrorNormal, 1.0f/mirrorArea);
if (normalize_v3(mirrorNormal) == 0.f)
{
// no normal
THRWEXCP(MirrorNormalInvalid, S_OK);
}
// the mirror plane has an equation of the type ax+by+cz = d where (a,b,c) is the normal vector
// if the mirror is more vertical then horizontal, the Z axis is the up direction.
// otherwise the Y axis is the up direction.
// If the mirror is not perfectly vertical(horizontal), the Z(Y) axis projection on the mirror
// plan by the normal will be the up direction.
if (fabsf(mirrorNormal[2]) > fabsf(mirrorNormal[1]) &&
fabsf(mirrorNormal[2]) > fabsf(mirrorNormal[0]))
{
// the mirror is more horizontal than vertical
copy_v3_v3(axis, yaxis);
}
else
{
// the mirror is more vertical than horizontal
copy_v3_v3(axis, zaxis);
}
dist = dot_v3v3(mirrorNormal, axis);
if (fabsf(dist) < FLT_EPSILON)
{
// the mirror is already fully aligned with up axis
copy_v3_v3(mirrorUp, axis);
}
else
{
// projection of axis to mirror plane through normal
copy_v3_v3(vec, mirrorNormal);
mul_v3_fl(vec, dist);
sub_v3_v3v3(mirrorUp, axis, vec);
if (normalize_v3(mirrorUp) == 0.f)
{
// should not happen
THRWEXCP(MirrorHorizontal, S_OK);
return;
}
}
// compute rotation matrix between local coord and mirror coord
// to match camera orientation, we select mirror z = -normal, y = up, x = y x z
negate_v3_v3(mirrorMat[2], mirrorNormal);
copy_v3_v3(mirrorMat[1], mirrorUp);
cross_v3_v3v3(mirrorMat[0], mirrorMat[1], mirrorMat[2]);
// transpose to make it a orientation matrix from local space to mirror space
transpose_m3(mirrorMat);
// transform all vertex to plane coordinates and determine mirror position
left = FLT_MAX;
right = -FLT_MAX;
bottom = FLT_MAX;
top = -FLT_MAX;
back = -FLT_MAX; // most backward vertex (=highest Z coord in mirror space)
for (it = mirrorVerts.begin(); it != mirrorVerts.end(); it++)
{
copy_v3_v3(vec, (float*)(*it)->getXYZ());
mul_m3_v3(mirrorMat, vec);
if (vec[0] < left)
left = vec[0];
if (vec[0] > right)
right = vec[0];
if (vec[1] < bottom)
bottom = vec[1];
if (vec[1] > top)
top = vec[1];
if (vec[2] > back)
back = vec[2];
}
// now store this information in the object for later rendering
m_mirrorHalfWidth = (right-left)*0.5f;
m_mirrorHalfHeight = (top-bottom)*0.5f;
if (m_mirrorHalfWidth < 0.01f || m_mirrorHalfHeight < 0.01f)
{
// mirror too small
THRWEXCP(MirrorTooSmall, S_OK);
}
// mirror position in mirror coord
vec[0] = (left+right)*0.5f;
vec[1] = (top+bottom)*0.5f;
vec[2] = back;
// convert it in local space: transpose again the matrix to get back to mirror to local transform
transpose_m3(mirrorMat);
mul_m3_v3(mirrorMat, vec);
// mirror position in local space
m_mirrorPos.setValue(vec[0], vec[1], vec[2]);
// mirror normal vector (pointed towards the back of the mirror) in local space
m_mirrorZ.setValue(-mirrorNormal[0], -mirrorNormal[1], -mirrorNormal[2]);
m_mirrorY.setValue(mirrorUp[0], mirrorUp[1], mirrorUp[2]);
m_mirrorX = m_mirrorY.cross(m_mirrorZ);
m_render = true;
setBackground(0, 0, 255, 255);
}
// define python type
PyTypeObject ImageMirrorType = {
PyVarObject_HEAD_INIT(NULL, 0)
"VideoTexture.ImageMirror", /*tp_name*/
sizeof(PyImage), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)Image_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
&imageBufferProcs, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
"Image source from mirror", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
imageRenderMethods, /* tp_methods */
0, /* tp_members */
imageMirrorGetSets, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)ImageMirror_init, /* tp_init */
0, /* tp_alloc */
Image_allocNew, /* tp_new */
};
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