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bounding box

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This commit is contained in:
Recep Aslantas
2018-01-18 16:36:58 +03:00
parent da8bbc6536
commit 8b2c74b0cc
9 changed files with 223 additions and 3 deletions
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5
LICENSE
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@@ -58,3 +58,8 @@ Fast Extraction of Viewing Frustum Planes from the World-View-Projection Matrix
Authors:
Gil Gribb (ggribb@ravensoft.com)
Klaus Hartmann (k_hartmann@osnabrueck.netsurf.de)
5. Transform AABB
Transform Axis Aligned Bounding Boxes:
http://dev.theomader.com/transform-bounding-boxes/
https://github.com/erich666/GraphicsGems/blob/master/gems/TransBox.c

123
include/cglm/box.h Normal file
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@@ -0,0 +1,123 @@
/*
* Copyright (c), Recep Aslantas.
*
* MIT License (MIT), http://opensource.org/licenses/MIT
* Full license can be found in the LICENSE file
*/
#ifndef cglm_box_h
#define cglm_box_h
#include "common.h"
#include "vec3.h"
#include "vec4.h"
/*!
* @brief apply transform to Axis-Aligned Bounding Box
*
* @param[in] box bounding box
* @param[in] m transform matrix
* @param[out] dest transformed bounding box
*/
CGLM_INLINE
void
glm_aabb_transform(vec3 box[2], mat4 m, vec3 dest[2]) {
vec3 v[2], xa, xb, ya, yb, za, zb, tmp;
glm_vec_scale(m[0], box[0][0], xa);
glm_vec_scale(m[0], box[1][0], xb);
glm_vec_scale(m[1], box[0][1], ya);
glm_vec_scale(m[1], box[1][1], yb);
glm_vec_scale(m[2], box[0][2], za);
glm_vec_scale(m[2], box[1][2], zb);
/* min(xa, xb) + min(ya, yb) + min(za, zb) + translation */
glm_vec_minv(xa, xb, v[0]);
glm_vec_minv(ya, yb, tmp);
glm_vec_add(v[0], tmp, v[0]);
glm_vec_minv(za, zb, tmp);
glm_vec_add(v[0], tmp, v[0]);
glm_vec_add(v[0], m[3], v[0]);
/* max(xa, xb) + max(ya, yb) + max(za, zb) + translation */
glm_vec_maxv(xa, xb, v[1]);
glm_vec_maxv(ya, yb, tmp);
glm_vec_add(v[1], tmp, v[1]);
glm_vec_maxv(za, zb, tmp);
glm_vec_add(v[1], tmp, v[1]);
glm_vec_add(v[1], m[3], v[1]);
glm_vec_copy(v[0], dest[0]);
glm_vec_copy(v[1], dest[1]);
}
/*!
* @brief merges two AABB bounding box and creates new one
*
* two box must be in same space, if one of box is in different space then
* you should consider to convert it's space by glm_box_space
*
* @param[in] box1 bounding box 1
* @param[in] box2 bounding box 2
* @param[out] dest merged bounding box
*/
CGLM_INLINE
void
glm_aabb_merge(vec3 box1[2], vec3 box2[2], vec3 dest[2]) {
dest[0][0] = glm_min(box1[0][0], box2[0][0]);
dest[0][1] = glm_min(box1[0][1], box2[0][1]);
dest[0][2] = glm_min(box1[0][2], box2[0][2]);
dest[1][0] = glm_max(box1[1][0], box2[1][0]);
dest[1][1] = glm_max(box1[1][1], box2[1][1]);
dest[1][2] = glm_max(box1[1][2], box2[1][2]);
}
/*!
* @brief crops a bounding box with another one.
*
* this could be useful for gettng a bbox which fits with view frustum and
* object bounding boxes. In this case you crop view frustum box with objects
* box
*
* @param[in] box bounding box 1
* @param[in] cropBox crop box
* @param[out] dest cropped bounding box
*/
CGLM_INLINE
void
glm_aabb_crop(vec3 box[2], vec3 cropBox[2], vec3 dest[2]) {
dest[0][0] = glm_max(box[0][0], cropBox[0][0]);
dest[0][1] = glm_max(box[0][1], cropBox[0][1]);
dest[0][2] = glm_max(box[0][2], cropBox[0][2]);
dest[1][0] = glm_min(box[1][0], cropBox[1][0]);
dest[1][1] = glm_min(box[1][1], cropBox[1][1]);
dest[1][2] = glm_min(box[1][2], cropBox[1][2]);
}
/*!
* @brief crops a bounding box with another one.
*
* this could be useful for gettng a bbox which fits with view frustum and
* object bounding boxes. In this case you crop view frustum box with objects
* box
*
* @param[in] box bounding box
* @param[in] cropBox crop box
* @param[in] clampBox miniumum box
* @param[out] dest cropped bounding box
*/
CGLM_INLINE
void
glm_aabb_crop_until(vec3 box[2],
vec3 cropBox[2],
vec3 clampBox[2],
vec3 dest[2]) {
glm_aabb_crop(box, cropBox, dest);
glm_aabb_merge(clampBox, dest, dest);
}
#endif /* cglm_box_h */

1
include/cglm/call.h
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@@ -22,6 +22,7 @@ extern "C" {
#include "call/euler.h"
#include "call/plane.h"
#include "call/frustum.h"
#include "call/box.h"
#include "call/io.h"
#ifdef __cplusplus

39
include/cglm/call/box.h Normal file
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@@ -0,0 +1,39 @@
/*
* Copyright (c), Recep Aslantas.
*
* MIT License (MIT), http://opensource.org/licenses/MIT
* Full license can be found in the LICENSE file
*/
#ifndef cglmc_box_h
#define cglmc_box_h
#ifdef __cplusplus
extern "C" {
#endif
#include "../cglm.h"
CGLM_EXPORT
void
glmc_aabb_transform(vec3 box[2], mat4 m, vec3 dest[2]);
CGLM_EXPORT
void
glmc_aabb_merge(vec3 box1[2], vec3 box2[2], vec3 dest[2]);
CGLM_EXPORT
void
glmc_aabb_crop(vec3 box[2], vec3 cropBox[2], vec3 dest[2]);
CGLM_EXPORT
void
glmc_aabb_crop_until(vec3 box[2],
vec3 cropBox[2],
vec3 clampBox[2],
vec3 dest[2]);
#ifdef __cplusplus
}
#endif
#endif /* cglmc_box_h */

1
include/cglm/cglm.h
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@@ -19,6 +19,7 @@
#include "quat.h"
#include "euler.h"
#include "plane.h"
#include "box.h"
#include "util.h"
#include "io.h"

9
makefile.am
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@@ -52,7 +52,8 @@ cglm_HEADERS = include/cglm/version.h \
include/cglm/quat.h \
include/cglm/affine-mat.h \
include/cglm/plane.h \
include/cglm/frustum.h
include/cglm/frustum.h \
include/cglm/box.h
cglm_calldir=$(includedir)/cglm/call
cglm_call_HEADERS = include/cglm/call/mat4.h \
@@ -65,7 +66,8 @@ cglm_call_HEADERS = include/cglm/call/mat4.h \
include/cglm/call/quat.h \
include/cglm/call/euler.h \
include/cglm/call/plane.h \
include/cglm/call/frustum.h
include/cglm/call/frustum.h \
include/cglm/call/box.h
cglm_simddir=$(includedir)/cglm/simd
cglm_simd_HEADERS = include/cglm/simd/intrin.h
@@ -94,7 +96,8 @@ libcglm_la_SOURCES=\
src/mat3.c \
src/mat4.c \
src/plane.c \
src/frustum.c
src/frustum.c \
src/box.c
test_tests_SOURCES=\
test/src/test_common.c \

36
src/box.c Normal file
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@@ -0,0 +1,36 @@
/*
* Copyright (c), Recep Aslantas.
*
* MIT License (MIT), http://opensource.org/licenses/MIT
* Full license can be found in the LICENSE file
*/
#include "../include/cglm/cglm.h"
#include "../include/cglm/call.h"
CGLM_EXPORT
void
glmc_aabb_transform(vec3 box[2], mat4 m, vec3 dest[2]) {
glm_aabb_transform(box, m, dest);
}
CGLM_EXPORT
void
glmc_aabb_merge(vec3 box1[2], vec3 box2[2], vec3 dest[2]) {
glm_aabb_merge(box1, box2, dest);
}
CGLM_EXPORT
void
glmc_aabb_crop(vec3 box[2], vec3 cropBox[2], vec3 dest[2]) {
glm_aabb_crop(box, cropBox, dest);
}
CGLM_EXPORT
void
glmc_aabb_crop_until(vec3 box[2],
vec3 cropBox[2],
vec3 clampBox[2],
vec3 dest[2]) {
glm_aabb_crop_until(box, cropBox, clampBox, dest);
}

3
win/cglm.vcxproj
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@@ -20,6 +20,7 @@
</ItemGroup>
<ItemGroup>
<ClCompile Include="..\src\affine.c" />
<ClCompile Include="..\src\box.c" />
<ClCompile Include="..\src\cam.c" />
<ClCompile Include="..\src\dllmain.c" />
<ClCompile Include="..\src\euler.c" />
@@ -35,8 +36,10 @@
<ItemGroup>
<ClInclude Include="..\include\cglm\affine-mat.h" />
<ClInclude Include="..\include\cglm\affine.h" />
<ClInclude Include="..\include\cglm\box.h" />
<ClInclude Include="..\include\cglm\call.h" />
<ClInclude Include="..\include\cglm\call\affine.h" />
<ClInclude Include="..\include\cglm\call\box.h" />
<ClInclude Include="..\include\cglm\call\cam.h" />
<ClInclude Include="..\include\cglm\call\euler.h" />
<ClInclude Include="..\include\cglm\call\frustum.h" />

9
win/cglm.vcxproj.filters
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@@ -72,6 +72,9 @@
<ClCompile Include="..\src\plane.c">
<Filter>src</Filter>
</ClCompile>
<ClCompile Include="..\src\box.c">
<Filter>src</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\src\config.h">
@@ -194,5 +197,11 @@
<ClInclude Include="..\include\cglm\plane.h">
<Filter>include\cglm</Filter>
</ClInclude>
<ClInclude Include="..\include\cglm\call\box.h">
<Filter>include\cglm\call</Filter>
</ClInclude>
<ClInclude Include="..\include\cglm\box.h">
<Filter>include\cglm</Filter>
</ClInclude>
</ItemGroup>
</Project>