AnotherFoxGuy/bounce
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Mesh generation to everybody

Browse Source 
Add cylinder mesh generation
Mesh generation can be used by everyone
Mesh generation also gives vertex normals for convenience
This commit is contained in:
Irlan
2019-04-21 16:06:51 -03:00
parent 77ad799d94
commit 490a2963df
9 changed files with 276 additions and 271 deletions
Download Patch File Download Diff File Expand all files Collapse all files

94
examples/testbed/framework/draw_gl2.h
View File

@ -28,7 +28,8 @@
#include <bounce/common/math/mat44.h>
#include <bounce/common/draw.h>
#include <testbed/framework/sphere_mesh.h>
#include <bounce/meshgen/sphere_mesh.h>
#include <bounce/meshgen/cylinder_mesh.h>
#define BUFFER_OFFSET(i) ((char*)NULL + (i))
@ -666,7 +667,7 @@ struct DrawSolidSphere
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.vertices, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_iboId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexCount * sizeof(u32), mesh.indices, GL_STATIC_DRAW);
@ -691,96 +692,25 @@ struct DrawSolidSphere
struct DrawSolidCylinder
{
enum
{
e_segments = 64,
e_vertexCount = e_segments * 6,
};
DrawSolidCylinder()
{
b3Vec3 vs[e_vertexCount];
b3Vec3 ns[e_vertexCount];
cymMesh mesh;
cymCreateMesh(mesh, 20);
u32 vc = 0;
for (u32 i = 0; i < e_segments; ++i)
{
float32 t0 = 2.0f * B3_PI * float32(i) / float32(e_segments);
float32 t1 = 2.0f * B3_PI * float32(i + 1) / float32(e_segments);
float32 c0 = cos(t0);
float32 s0 = sin(t0);
float32 c1 = cos(t1);
float32 s1 = sin(t1);
b3Vec3 v1;
v1.x = s0;
v1.y = -0.5f;
v1.z = c0;
b3Vec3 v2;
v2.x = s1;
v2.y = -0.5f;
v2.z = c1;
b3Vec3 v3;
v3.x = s1;
v3.y = 0.5f;
v3.z = c1;
b3Vec3 v4;
v4.x = s0;
v4.y = 0.5f;
v4.z = c0;
b3Vec3 n = b3Cross(v2 - v1, v3 - v1);
n.Normalize();
vs[vc] = v1;
ns[vc] = n;
++vc;
vs[vc] = v2;
ns[vc] = n;
++vc;
vs[vc] = v3;
ns[vc] = n;
++vc;
vs[vc] = v1;
ns[vc] = n;
++vc;
vs[vc] = v3;
ns[vc] = n;
++vc;
vs[vc] = v4;
ns[vc] = n;
++vc;
}
u32 is[e_vertexCount];
u32 ic = vc;
for (u32 i = 0; i < vc; ++i)
{
is[i] = i;
}
m_vertexCount = mesh.vertexCount;
m_indexCount = mesh.indexCount;
glGenBuffers(2, m_vboIds);
glGenBuffers(1, &m_iboId);
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), vs, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), ns, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_iboId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, ic * sizeof(u32), is, GL_STATIC_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexCount * sizeof(u32), mesh.indices, GL_STATIC_DRAW);
AssertGL();
@ -796,6 +726,8 @@ struct DrawSolidCylinder
GLuint m_vboIds[2];
GLuint m_iboId;
u32 m_vertexCount;
u32 m_indexCount;
};
struct DrawSolid
@ -875,7 +807,7 @@ struct DrawSolid
glEnableVertexAttribArray(m_normalAttribute);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_cylinder.m_iboId);
glDrawElements(GL_TRIANGLES, m_cylinder.e_vertexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
glDrawElements(GL_TRIANGLES, m_cylinder.m_indexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
glDisableVertexAttribArray(m_normalAttribute);

92
examples/testbed/framework/draw_gl4.h
View File

@ -28,7 +28,8 @@
#include <bounce/common/math/mat44.h>
#include <bounce/common/draw.h>
#include <testbed/framework/sphere_mesh.h>
#include <bounce/meshgen/sphere_mesh.h>
#include <bounce/meshgen/cylinder_mesh.h>
#define BUFFER_OFFSET(i) ((char*)NULL + (i))
@ -706,96 +707,25 @@ struct DrawSolidSphere
struct DrawSolidCylinder
{
enum
{
e_segments = 64,
e_vertexCount = e_segments * 6,
};
DrawSolidCylinder()
{
b3Vec3 vs[e_vertexCount];
b3Vec3 ns[e_vertexCount];
cymMesh mesh;
cymCreateMesh(mesh, 20);
u32 vc = 0;
for (u32 i = 0; i < e_segments; ++i)
{
float32 t0 = 2.0f * B3_PI * float32(i) / float32(e_segments);
float32 t1 = 2.0f * B3_PI * float32(i + 1) / float32(e_segments);
float32 c0 = cos(t0);
float32 s0 = sin(t0);
float32 c1 = cos(t1);
float32 s1 = sin(t1);
b3Vec3 v1;
v1.x = s0;
v1.y = -0.5f;
v1.z = c0;
b3Vec3 v2;
v2.x = s1;
v2.y = -0.5f;
v2.z = c1;
b3Vec3 v3;
v3.x = s1;
v3.y = 0.5f;
v3.z = c1;
b3Vec3 v4;
v4.x = s0;
v4.y = 0.5f;
v4.z = c0;
b3Vec3 n = b3Cross(v2 - v1, v3 - v1);
n.Normalize();
vs[vc] = v1;
ns[vc] = n;
++vc;
vs[vc] = v2;
ns[vc] = n;
++vc;
vs[vc] = v3;
ns[vc] = n;
++vc;
vs[vc] = v1;
ns[vc] = n;
++vc;
vs[vc] = v3;
ns[vc] = n;
++vc;
vs[vc] = v4;
ns[vc] = n;
++vc;
}
u32 is[e_vertexCount];
u32 ic = vc;
for (u32 i = 0; i < vc; ++i)
{
is[i] = i;
}
m_vertexCount = mesh.vertexCount;
m_indexCount = mesh.indexCount;
glGenBuffers(2, m_vboIds);
glGenBuffers(1, &m_iboId);
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), vs, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), ns, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, m_vertexCount * sizeof(b3Vec3), mesh.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_iboId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, ic * sizeof(u32), is, GL_STATIC_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexCount * sizeof(u32), mesh.indices, GL_STATIC_DRAW);
AssertGL();
@ -811,6 +741,8 @@ struct DrawSolidCylinder
GLuint m_vboIds[2];
GLuint m_iboId;
u32 m_vertexCount;
u32 m_indexCount;
};
struct DrawSolid
@ -891,7 +823,7 @@ struct DrawSolid
glEnableVertexAttribArray(m_normalAttribute);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_cylinder.m_iboId);
glDrawElements(GL_TRIANGLES, m_cylinder.e_vertexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
glDrawElements(GL_TRIANGLES, m_cylinder.m_indexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);

212
examples/testbed/framework/sphere_mesh.cpp
View File

@ -1,212 +0,0 @@
/*
* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include <testbed/framework/sphere_mesh.h>
static inline void smAddVertex(smMesh& mesh, float32 x, float32 y, float32 z)
{
mesh.vertices[mesh.vertexCount++].Set(x, y, z);
}
static inline void smAddTriangle(smMesh& mesh, u32 v1, u32 v2, u32 v3)
{
mesh.indices[mesh.indexCount++] = v1;
mesh.indices[mesh.indexCount++] = v2;
mesh.indices[mesh.indexCount++] = v3;
}
static inline void smSetAsOctahedron(smMesh& mesh)
{
assert(mesh.vertexCount == 0);
smAddVertex(mesh, 0.0f, -1.0f, 0.0f);
smAddVertex(mesh, 0.0f, 0.0f, 1.0f);
smAddVertex(mesh, -1.0f, 0.0f, 0.0f);
smAddVertex(mesh, 0.0f, 0.0f, -1.0f);
smAddVertex(mesh, 1.0f, 0.0f, 0.0f);
smAddVertex(mesh, 0.0f, 1.0f, 0.0f);
assert(mesh.indexCount == 0);
smAddTriangle(mesh, 0, 1, 2);
smAddTriangle(mesh, 0, 2, 3);
smAddTriangle(mesh, 0, 3, 4);
smAddTriangle(mesh, 0, 4, 1);
smAddTriangle(mesh, 5, 2, 1);
smAddTriangle(mesh, 5, 3, 2);
smAddTriangle(mesh, 5, 4, 3);
smAddTriangle(mesh, 5, 1, 4);
}
struct smEdge
{
u32 v1, v2;
};
struct smEdgeVertexPair
{
smEdge edge;
u32 vertex;
};
struct smEdgeVertexMap
{
u32 pairCount;
smEdgeVertexPair* pairs;
};
static inline void smAddPair(smEdgeVertexMap& map, const smEdgeVertexPair& pair)
{
map.pairs[map.pairCount++] = pair;
}
static inline smEdgeVertexPair* smFind(smEdgeVertexMap& map, u32 v1, u32 v2)
{
for (u32 i = 0; i < map.pairCount; ++i)
{
smEdgeVertexPair* pair = map.pairs + i;
if (pair->edge.v1 == v1 && pair->edge.v2 == v2)
{
return pair;
}
}
return nullptr;
}
static inline u32 smSubdivideEdge(smMesh& in_out, smEdgeVertexMap& map,
u32 i1, u32 i2)
{
smEdgeVertexPair* pair = smFind(map, i2, i1);
if (pair)
{
return pair->vertex;
}
smEdge newEdge;
newEdge.v1 = i1;
newEdge.v2 = i2;
u32 newVertex = in_out.vertexCount;
b3Vec3 v1 = in_out.vertices[i1];
b3Vec3 v2 = in_out.vertices[i2];
b3Vec3 v = 0.5f * (v1 + v2);
v.Normalize();
smAddVertex(in_out, v.x, v.y, v.z);
smEdgeVertexPair newPair;
newPair.edge = newEdge;
newPair.vertex = newVertex;
smAddPair(map, newPair);
return newVertex;
}
static void smSubdivideMesh(smMesh& in_out, smEdgeVertexMap& map)
{
map.pairCount = 0;
u32 inputIndexCount = in_out.indexCount;
for (u32 i = 0; i < inputIndexCount / 3; ++i)
{
u32 vi1 = in_out.indices[3 * i + 0];
u32 vi2 = in_out.indices[3 * i + 1];
u32 vi3 = in_out.indices[3 * i + 2];
u32 vi4 = smSubdivideEdge(in_out, map, vi1, vi2);
u32 vi5 = smSubdivideEdge(in_out, map, vi2, vi3);
u32 vi6 = smSubdivideEdge(in_out, map, vi3, vi1);
smAddTriangle(in_out, vi1, vi4, vi6);
smAddTriangle(in_out, vi4, vi2, vi5);
smAddTriangle(in_out, vi5, vi3, vi6);
smAddTriangle(in_out, vi4, vi5, vi6);
}
}
// Compute the maximum number of vertices and
// the number of triangle vertex indices in the intermediate mesh.
// Also compute the maximum number of edge-vertex pairs per subdivision step
static inline void smCount(u32& vertexCount, u32& indexCount, u32& edgeVertexPairCount, u32 subdivisions)
{
vertexCount = 6;
indexCount = 3 * 8;
for (u32 i = 0; i < subdivisions; ++i)
{
vertexCount += 3 * (indexCount / 3);
indexCount += 4 * 3 * (indexCount / 3);
}
edgeVertexPairCount = 3 * (indexCount / 3);
}
void smCreateMesh(smMesh& output, u32 subdivisions)
{
assert(output.vertexCount == 0);
assert(output.indexCount == 0);
u32 vertexCount, indexCount, edgeVertexPairCount;
smCount(vertexCount, indexCount, edgeVertexPairCount, subdivisions);
u32 byteCount = 0;
byteCount += vertexCount * sizeof(b3Vec3);
byteCount += indexCount * sizeof(u32);
byteCount += edgeVertexPairCount * sizeof(smEdgeVertexPair);
u8* bytes = (u8*)malloc(byteCount);
smMesh out;
out.vertexCount = 0;
out.vertices = (b3Vec3*)bytes;
out.indexCount = 0;
out.indices = (u32*) ((u8*)(out.vertices) + (vertexCount * sizeof(b3Vec3)));
smEdgeVertexMap map;
map.pairCount = 0;
map.pairs = (smEdgeVertexPair*) ((u8*)(out.indices) + (indexCount * sizeof(u32)));
smSetAsOctahedron(out);
for (u32 i = 0; i < subdivisions; ++i)
{
smSubdivideMesh(out, map);
}
assert(map.pairCount < edgeVertexPairCount);
assert(out.vertexCount <= vertexCount);
assert(out.indexCount == indexCount);
output.vertexCount = out.vertexCount;
output.vertices = (b3Vec3*)malloc(out.vertexCount * sizeof(b3Vec3));
memcpy(output.vertices, out.vertices, out.vertexCount * sizeof(b3Vec3));
output.indexCount = out.indexCount;
output.indices = (u32*)malloc(out.indexCount * sizeof(u32));
memcpy(output.indices, out.indices, out.indexCount * sizeof(u32));
free(bytes);
out.vertices = nullptr;
out.indices = nullptr;
}

51
examples/testbed/framework/sphere_mesh.h
View File

@ -1,51 +0,0 @@
/*
* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#ifndef SPHERE_MESH_H
#define SPHERE_MESH_H
#include <bounce/common/math/vec3.h>
// This structure represents a triangle mesh.
struct smMesh
{
smMesh()
{
vertexCount = 0;
vertices = nullptr;
indexCount = 0;
indices = nullptr;
}
~smMesh()
{
free(vertices);
free(indices);
}
u32 vertexCount; // number of unique vertices
b3Vec3* vertices; // list of unique vertices
u32 indexCount; // number of triangle vertex indices
u32* indices; // list of triangle vertex index
};
// Create a unit icosphere given the number of subdivisions.
// If the number of subdivisions to perform is zero then the output mesh is an octahedron.
void smCreateMesh(smMesh& output, u32 subdivisions);
#endif