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Added bounding box system, with camera support

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Michaël Lemaire 2013-06-27 11:46:18 +02:00
parent 48494f9e18
commit 3e42320c3f
4 changed files with 105 additions and 41 deletions
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74
src/rendering/camera.c
View file

@ -5,6 +5,7 @@
#include "render.h"
#include "scenery.h"
#include "tools.h"
#include "tools/boundingbox.h"
struct CameraDefinition
{
@ -361,58 +362,49 @@ Vector3 cameraUnproject(CameraDefinition* camera, Vector3 point)
renderPushQuad(&v1, &v2, &v3, &v4);
}*/
static inline void _updateBox(Vector3* point, double* xmin, double* xmax, double* ymin, double* ymax, double* zmax)
{
*xmin = (*xmin < point->x) ? *xmin : point->x;
*ymin = (*ymin < point->y) ? *ymin : point->y;
*xmax = (*xmax > point->x) ? *xmax : point->x;
*ymax = (*ymax > point->y) ? *ymax : point->y;
*zmax = (*zmax > point->z) ? *zmax : point->z;
}
int cameraIsBoxInView(CameraDefinition* camera, Vector3 center, double xsize, double ysize, double zsize)
{
Vector3 projected;
double xmin, xmax, ymin, ymax, zmax;
BoundingBox box;
center.x -= xsize / 2.0;
center.y -= ysize / 2.0;
center.z -= zsize / 2.0;
projected = cameraProject(camera, center);
xmin = xmax = projected.x;
ymin = ymax = projected.y;
zmax = projected.z;
boundingBoxReset(&box);
center.x += xsize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
boundingBoxPushPoint(&box, v3Add(center, v3(-xsize, -ysize, -zsize)));
boundingBoxPushPoint(&box, v3Add(center, v3(xsize, ysize, zsize)));
center.z += zsize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
return cameraIsUnprojectedBoxInView(camera, &box);
}
center.x -= xsize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
int cameraIsUnprojectedBoxInView(CameraDefinition* camera, BoundingBox* box)
{
BoundingBox projected;
center.y += ysize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
boundingBoxReset(&projected);
center.x += xsize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmin, box->ymin, box->zmin)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmax, box->ymin, box->zmin)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmin, box->ymax, box->zmin)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmax, box->ymax, box->zmin)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmin, box->ymin, box->zmax)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmax, box->ymin, box->zmax)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmin, box->ymax, box->zmax)));
boundingBoxPushPoint(&projected, cameraProject(camera, v3(box->xmax, box->ymax, box->zmax)));
center.z -= zsize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
return cameraIsProjectedBoxInView(camera, &projected);
}
center.x -= xsize;
projected = cameraProject(camera, center);
_updateBox(&projected, &xmin, &xmax, &ymin, &ymax, &zmax);
int cameraIsProjectedBoxInView(CameraDefinition* camera, BoundingBox* box)
{
if (box->xmin <= camera->width && box->xmax >= 0.0 && box->ymin <= camera->height && box->ymax >= 0.0 && box->zmax >= camera->perspective.znear)
{
double dx = box->xmax - box->xmin;
double dy = box->ymax - box->ymin;
return xmin <= camera->width && xmax >= 0.0 && ymin <= camera->height && ymax >= 0.0 && zmax >= camera->perspective.znear;
return (int)ceil(dx) * (int)ceil(dy);
}
else
{
return 0;
}
}
int cameraTransitionToAnother(CameraDefinition* current, CameraDefinition* wanted, double factor)

3
src/rendering/camera.h
View file

@ -3,6 +3,7 @@
#include "tools/pack.h"
#include "tools/euclid.h"
#include "tools/boundingbox.h"
#ifdef __cplusplus
extern "C"
@ -57,6 +58,8 @@ Vector3 cameraProject(CameraDefinition* camera, Vector3 point);
Vector3 cameraUnproject(CameraDefinition* camera, Vector3 point);
/*void cameraPushOverlay(CameraDefinition* camera, Color col, f_RenderFragmentCallback callback);*/
int cameraIsBoxInView(CameraDefinition* camera, Vector3 center, double xsize, double ysize, double zsize);
int cameraIsUnprojectedBoxInView(CameraDefinition* camera, BoundingBox* box);
int cameraIsProjectedBoxInView(CameraDefinition* camera, BoundingBox* box);
int cameraTransitionToAnother(CameraDefinition* current, CameraDefinition* wanted, double factor);

41
src/rendering/tools/boundingbox.c Normal file
View file

@ -0,0 +1,41 @@
#include "boundingbox.h"
void boundingBoxReset(BoundingBox* box)
{
box->empty = 1;
box->xmin = 10000000000.0;
box->xmax = -10000000000.0;
box->ymin = 10000000000.0;
box->ymax = -10000000000.0;
box->zmin = 10000000000.0;
box->zmax = -10000000000.0;
}
void boundingBoxPushPoint(BoundingBox* box, Vector3 point)
{
box->empty = 0;
if (point.x < box->xmin)
{
box->xmin = point.x;
}
if (point.x > box->xmax)
{
box->xmax = point.x;
}
if (point.y < box->ymin)
{
box->ymin = point.y;
}
if (point.y > box->ymax)
{
box->ymax = point.y;
}
if (point.z < box->zmin)
{
box->zmin = point.z;
}
if (point.z > box->zmax)
{
box->zmax = point.z;
}
}

28
src/rendering/tools/boundingbox.h Normal file
View file

@ -0,0 +1,28 @@
#ifndef _RENDERING_TOOLS_BOUNDINGBOX_H_
#define _RENDERING_TOOLS_BOUNDINGBOX_H_
#include "euclid.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct
{
int empty;
double xmin;
double xmax;
double ymin;
double ymax;
double zmin;
double zmax;
} BoundingBox;
void boundingBoxReset(BoundingBox* box);
void boundingBoxPushPoint(BoundingBox* box, Vector3 point);
#ifdef __cplusplus
}
#endif
#endif