src/client/mesh.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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.
*/

#include "mesh.h"
#include "debug.h"
#include "log.h"
#include "irrMap.h"
#include <cmath>
#include <iostream>
#include <IAnimatedMesh.h>
#include <SAnimatedMesh.h>
#include <IAnimatedMeshSceneNode.h>

inline static void applyShadeFactor(video::SColor& color, float factor)
{
	color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
	color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
	color.setBlue(core::clamp(core::round32(color.getBlue()*factor), 0, 255));
}

void applyFacesShading(video::SColor &color, const v3f &normal)
{
	/*
		Some drawtypes have normals set to (0, 0, 0), this must result in
		maximum brightness: shade factor 1.0.
		Shade factors for aligned cube faces are:
		+Y 1.000000 sqrt(1.0)
		-Y 0.447213 sqrt(0.2)
		+-X 0.670820 sqrt(0.45)
		+-Z 0.836660 sqrt(0.7)
	*/
	float x2 = normal.X * normal.X;
	float y2 = normal.Y * normal.Y;
	float z2 = normal.Z * normal.Z;
	if (normal.Y < 0)
		applyShadeFactor(color, 0.670820f * x2 + 0.447213f * y2 + 0.836660f * z2);
	else if ((x2 > 1e-3) || (z2 > 1e-3))
		applyShadeFactor(color, 0.670820f * x2 + 1.000000f * y2 + 0.836660f * z2);
}

scene::IAnimatedMesh* createCubeMesh(v3f scale)
{
	video::SColor c(255,255,255,255);
	video::S3DVertex vertices[24] =
	{
		// Up
		video::S3DVertex(-0.5,+0.5,-0.5, 0,1,0, c, 0,1),
		video::S3DVertex(-0.5,+0.5,+0.5, 0,1,0, c, 0,0),
		video::S3DVertex(+0.5,+0.5,+0.5, 0,1,0, c, 1,0),
		video::S3DVertex(+0.5,+0.5,-0.5, 0,1,0, c, 1,1),
		// Down
		video::S3DVertex(-0.5,-0.5,-0.5, 0,-1,0, c, 0,0),
		video::S3DVertex(+0.5,-0.5,-0.5, 0,-1,0, c, 1,0),
		video::S3DVertex(+0.5,-0.5,+0.5, 0,-1,0, c, 1,1),
		video::S3DVertex(-0.5,-0.5,+0.5, 0,-1,0, c, 0,1),
		// Right
		video::S3DVertex(+0.5,-0.5,-0.5, 1,0,0, c, 0,1),
		video::S3DVertex(+0.5,+0.5,-0.5, 1,0,0, c, 0,0),
		video::S3DVertex(+0.5,+0.5,+0.5, 1,0,0, c, 1,0),
		video::S3DVertex(+0.5,-0.5,+0.5, 1,0,0, c, 1,1),
		// Left
		video::S3DVertex(-0.5,-0.5,-0.5, -1,0,0, c, 1,1),
		video::S3DVertex(-0.5,-0.5,+0.5, -1,0,0, c, 0,1),
		video::S3DVertex(-0.5,+0.5,+0.5, -1,0,0, c, 0,0),
		video::S3DVertex(-0.5,+0.5,-0.5, -1,0,0, c, 1,0),
		// Back
		video::S3DVertex(-0.5,-0.5,+0.5, 0,0,1, c, 1,1),
		video::S3DVertex(+0.5,-0.5,+0.5, 0,0,1, c, 0,1),
		video::S3DVertex(+0.5,+0.5,+0.5, 0,0,1, c, 0,0),
		video::S3DVertex(-0.5,+0.5,+0.5, 0,0,1, c, 1,0),
		// Front
		video::S3DVertex(-0.5,-0.5,-0.5, 0,0,-1, c, 0,1),
		video::S3DVertex(-0.5,+0.5,-0.5, 0,0,-1, c, 0,0),
		video::S3DVertex(+0.5,+0.5,-0.5, 0,0,-1, c, 1,0),
		video::S3DVertex(+0.5,-0.5,-0.5, 0,0,-1, c, 1,1),
	};

	u16 indices[6] = {0,1,2,2,3,0};

	scene::SMesh *mesh = new scene::SMesh();
	for (u32 i=0; i<6; ++i)
	{
		scene::IMeshBuffer *buf = new scene::SMeshBuffer();
		buf->append(vertices + 4 * i, 4, indices, 6);
		// Set default material
		buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
		buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
		buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
		// Add mesh buffer to mesh
		mesh->addMeshBuffer(buf);
		buf->drop();
	}

	scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
	mesh->drop();
	scaleMesh(anim_mesh, scale);  // also recalculates bounding box
	return anim_mesh;
}

void scaleMesh(scene::IMesh *mesh, v3f scale)
{
	if (mesh == NULL)
		return;

	aabb3f bbox;
	bbox.reset(0, 0, 0);

	u32 mc = mesh->getMeshBufferCount();
	for (u32 j = 0; j < mc; j++) {
		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
		const u32 stride = getVertexPitchFromType(buf->getVertexType());
		u32 vertex_count = buf->getVertexCount();
		u8 *vertices = (u8 *)buf->getVertices();
		for (u32 i = 0; i < vertex_count; i++)
			((video::S3DVertex *)(vertices + i * stride))->Pos *= scale;

		buf->recalculateBoundingBox();

		// calculate total bounding box
		if (j == 0)
			bbox = buf->getBoundingBox();
		else
			bbox.addInternalBox(buf->getBoundingBox());
	}
	mesh->setBoundingBox(bbox);
}

void translateMesh(scene::IMesh *mesh, v3f vec)
{
	if (mesh == NULL)
		return;

	aabb3f bbox;
	bbox.reset(0, 0, 0);

	u32 mc = mesh->getMeshBufferCount();
	for (u32 j = 0; j < mc; j++) {
		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
		const u32 stride = getVertexPitchFromType(buf->getVertexType());
		u32 vertex_count = buf->getVertexCount();
		u8 *vertices = (u8 *)buf->getVertices();
		for (u32 i = 0; i < vertex_count; i++)
			((video::S3DVertex *)(vertices + i * stride))->Pos += vec;

		buf->recalculateBoundingBox();

		// calculate total bounding box
		if (j == 0)
			bbox = buf->getBoundingBox();
		else
			bbox.addInternalBox(buf->getBoundingBox());
	}
	mesh->setBoundingBox(bbox);
}

void setMeshBufferColor(scene::IMeshBuffer *buf, const video::SColor &color)
{
	const u32 stride = getVertexPitchFromType(buf->getVertexType());
	u32 vertex_count = buf->getVertexCount();
	u8 *vertices = (u8 *) buf->getVertices();
	for (u32 i = 0; i < vertex_count; i++)
		((video::S3DVertex *) (vertices + i * stride))->Color = color;
}

void setAnimatedMeshColor(scene::IAnimatedMeshSceneNode *node, const video::SColor &color)
{
	for (u32 i = 0; i < node->getMaterialCount(); ++i) {
		node->getMaterial(i).EmissiveColor = color;
	}
}

void setMeshColor(scene::IMesh *mesh, const video::SColor &color)
{
	if (mesh == NULL)
		return;

	u32 mc = mesh->getMeshBufferCount();
	for (u32 j = 0; j < mc; j++)
		setMeshBufferColor(mesh->getMeshBuffer(j), color);
}

void setMeshBufferTextureCoords(scene::IMeshBuffer *buf, const v2f *uv, u32 count)
{
	const u32 stride = getVertexPitchFromType(buf->getVertexType());
	assert(buf->getVertexCount() >= count);
	u8 *vertices = (u8 *) buf->getVertices();
	for (u32 i = 0; i < count; i++)
		((video::S3DVertex*) (vertices + i * stride))->TCoords = uv[i];
}

template <typename F>
static void applyToMesh(scene::IMesh *mesh, const F &fn)
{
	u16 mc = mesh->getMeshBufferCount();
	for (u16 j = 0; j < mc; j++) {
		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
		const u32 stride = getVertexPitchFromType(buf->getVertexType());
		u32 vertex_count = buf->getVertexCount();
		char *vertices = reinterpret_cast<char *>(buf->getVertices());
		for (u32 i = 0; i < vertex_count; i++)
			fn(reinterpret_cast<video::S3DVertex *>(vertices + i * stride));
	}
}

void colorizeMeshBuffer(scene::IMeshBuffer *buf, const video::SColor *buffercolor)
{
	const u32 stride = getVertexPitchFromType(buf->getVertexType());
	u32 vertex_count = buf->getVertexCount();
	u8 *vertices = (u8 *) buf->getVertices();
	for (u32 i = 0; i < vertex_count; i++) {
		video::S3DVertex *vertex = (video::S3DVertex *) (vertices + i * stride);
		video::SColor *vc = &(vertex->Color);
		// Reset color
		*vc = *buffercolor;
		// Apply shading
		applyFacesShading(*vc, vertex->Normal);
	}
}

void setMeshColorByNormalXYZ(scene::IMesh *mesh,
		const video::SColor &colorX,
		const video::SColor &colorY,
		const video::SColor &colorZ)
{
	if (!mesh)
		return;
	auto colorizator = [=] (video::S3DVertex *vertex) {
		f32 x = fabs(vertex->Normal.X);
		f32 y = fabs(vertex->Normal.Y);
		f32 z = fabs(vertex->Normal.Z);
		if (x >= y && x >= z)
			vertex->Color = colorX;
		else if (y >= z)
			vertex->Color = colorY;
		else
			vertex->Color = colorZ;
	};
	applyToMesh(mesh, colorizator);
}

void setMeshColorByNormal(scene::IMesh *mesh, const v3f &normal,
		const video::SColor &color)
{
	if (!mesh)
		return;
	auto colorizator = [normal, color] (video::S3DVertex *vertex) {
		if (vertex->Normal == normal)
			vertex->Color = color;
	};
	applyToMesh(mesh, colorizator);
}

template <float v3f::*U, float v3f::*V>
static void rotateMesh(scene::IMesh *mesh, float degrees)
{
	degrees *= M_PI / 180.0f;
	float c = std::cos(degrees);
	float s = std::sin(degrees);
	auto rotator = [c, s] (video::S3DVertex *vertex) {
		float u = vertex->Pos.*U;
		float v = vertex->Pos.*V;
		vertex->Pos.*U = c * u - s * v;
		vertex->Pos.*V = s * u + c * v;
	};
	applyToMesh(mesh, rotator);
}

void rotateMeshXYby(scene::IMesh *mesh, f64 degrees)
{
	rotateMesh<&v3f::X, &v3f::Y>(mesh, degrees);
}

void rotateMeshXZby(scene::IMesh *mesh, f64 degrees)
{
	rotateMesh<&v3f::X, &v3f::Z>(mesh, degrees);
}

void rotateMeshYZby(scene::IMesh *mesh, f64 degrees)
{
	rotateMesh<&v3f::Y, &v3f::Z>(mesh, degrees);
}

void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)
{
	int axisdir = facedir >> 2;
	facedir &= 0x03;
	switch (facedir) {
		case 1: rotateMeshXZby(mesh, -90); break;
		case 2: rotateMeshXZby(mesh, 180); break;
		case 3: rotateMeshXZby(mesh, 90); break;
	}
	switch (axisdir) {
		case 1: rotateMeshYZby(mesh, 90); break; // z+
		case 2: rotateMeshYZby(mesh, -90); break; // z-
		case 3: rotateMeshXYby(mesh, -90); break; // x+
		case 4: rotateMeshXYby(mesh, 90); break; // x-
		case 5: rotateMeshXYby(mesh, -180); break;
	}
}

void recalculateBoundingBox(scene::IMesh *src_mesh)
{
	aabb3f bbox;
	bbox.reset(0,0,0);
	for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
		scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
		buf->recalculateBoundingBox();
		if (j == 0)
			bbox = buf->getBoundingBox();
		else
			bbox.addInternalBox(buf->getBoundingBox());
	}
	src_mesh->setBoundingBox(bbox);
}

bool checkMeshNormals(scene::IMesh *mesh)
{
	// Assume correct normals if this many first faces get it right.
	static const u16 MAX_FACES_TO_CHECK = 9;

	u32 buffer_count = mesh->getMeshBufferCount();

	for (u32 i = 0; i < buffer_count; i++) {
		scene::IMeshBuffer *buffer = mesh->getMeshBuffer(i);

		// Here we intentionally check only first normal, assuming that if buffer
		// has it valid, then most likely all other ones are fine too. We can
		// check all of the normals to have length, but it seems like an overkill
		// hurting the performance and covering only really weird broken models.
		f32 length = buffer->getNormal(0).getLength();

		if (!std::isfinite(length) || length < 1e-10f)
			return false;

		const u16 count = MYMIN(MAX_FACES_TO_CHECK * 3, buffer->getIndexCount() - 3);
		for (u16 i = 0; i < count; i += 3) {

			core::plane3df plane(buffer->getPosition(buffer->getIndices()[i]),
					buffer->getPosition(buffer->getIndices()[i+1]),
					buffer->getPosition(buffer->getIndices()[i+2]));

			for (u16 j = 0; j < 3; j++)
				if (plane.Normal.dotProduct(buffer->getNormal(buffer->getIndices()[i+j])) <= 0)
					return false;
		}

	}

	return true;
}

scene::IMeshBuffer* cloneMeshBuffer(scene::IMeshBuffer *mesh_buffer)
{
	switch (mesh_buffer->getVertexType()) {
	case video::EVT_STANDARD: {
		video::S3DVertex *v = (video::S3DVertex *) mesh_buffer->getVertices();
		u16 *indices = mesh_buffer->getIndices();
		scene::SMeshBuffer *cloned_buffer = new scene::SMeshBuffer();
		cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
			mesh_buffer->getIndexCount());
		return cloned_buffer;
	}
	case video::EVT_2TCOORDS: {
		video::S3DVertex2TCoords *v =
			(video::S3DVertex2TCoords *) mesh_buffer->getVertices();
		u16 *indices = mesh_buffer->getIndices();
		scene::SMeshBufferLightMap *cloned_buffer =
			new scene::SMeshBufferLightMap();
		cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
			mesh_buffer->getIndexCount());
		return cloned_buffer;
	}
	case video::EVT_TANGENTS: {
		video::S3DVertexTangents *v =
			(video::S3DVertexTangents *) mesh_buffer->getVertices();
		u16 *indices = mesh_buffer->getIndices();
		scene::SMeshBufferTangents *cloned_buffer =
			new scene::SMeshBufferTangents();
		cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
			mesh_buffer->getIndexCount());
		return cloned_buffer;
	}
	}
	// This should not happen.
	sanity_check(false);
	return NULL;
}

scene::SMesh* cloneMesh(scene::IMesh *src_mesh)
{
	scene::SMesh* dst_mesh = new scene::SMesh();
	for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
		scene::IMeshBuffer *temp_buf = cloneMeshBuffer(
			src_mesh->getMeshBuffer(j));
		dst_mesh->addMeshBuffer(temp_buf);
		temp_buf->drop();

	}
	return dst_mesh;
}

scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
		const f32 *uv_coords, float expand)
{
	scene::SMesh* dst_mesh = new scene::SMesh();

	for (u16 j = 0; j < 6; j++)
	{
		scene::IMeshBuffer *buf = new scene::SMeshBuffer();
		buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
		buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
		dst_mesh->addMeshBuffer(buf);
		buf->drop();
	}

	video::SColor c(255,255,255,255);

	for (aabb3f box : boxes) {
		box.repair();

		box.MinEdge.X -= expand;
		box.MinEdge.Y -= expand;
		box.MinEdge.Z -= expand;
		box.MaxEdge.X += expand;
		box.MaxEdge.Y += expand;
		box.MaxEdge.Z += expand;

		// Compute texture UV coords
		f32 tx1 = (box.MinEdge.X / BS) + 0.5;
		f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
		f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
		f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
		f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
		f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;

		f32 txc_default[24] = {
			// up
			tx1, 1 - tz2, tx2, 1 - tz1,
			// down
			tx1, tz1, tx2, tz2,
			// right
			tz1, 1 - ty2, tz2, 1 - ty1,
			// left
			1 - tz2, 1 - ty2, 1 - tz1, 1 - ty1,
			// back
			1 - tx2, 1 - ty2, 1 - tx1, 1 - ty1,
			// front
			tx1, 1 - ty2, tx2, 1 - ty1,
		};

		// use default texture UV mapping if not provided
		const f32 *txc = uv_coords ? uv_coords : txc_default;

		v3f min = box.MinEdge;
		v3f max = box.MaxEdge;

		video::S3DVertex vertices[24] =
		{
			// up
			video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c, txc[0],txc[1]),
			video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c, txc[2],txc[1]),
			video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c, txc[2],txc[3]),
			video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c, txc[0],txc[3]),
			// down
			video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c, txc[4],txc[5]),
			video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c, txc[6],txc[5]),
			video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c, txc[6],txc[7]),
			video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c, txc[4],txc[7]),
			// right
			video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c, txc[ 8],txc[9]),
			video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c, txc[10],txc[9]),
			video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c, txc[10],txc[11]),
			video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c, txc[ 8],txc[11]),
			// left
			video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c, txc[12],txc[13]),
			video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c, txc[14],txc[13]),
			video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c, txc[14],txc[15]),
			video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c, txc[12],txc[15]),
			// back
			video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c, txc[16],txc[17]),
			video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c, txc[18],txc[17]),
			video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c, txc[18],txc[19]),
			video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c, txc[16],txc[19]),
			// front
			video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c, txc[20],txc[21]),
			video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c, txc[22],txc[21]),
			video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c, txc[22],txc[23]),
			video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c, txc[20],txc[23]),
		};

		u16 indices[] = {0,1,2,2,3,0};

		for(u16 j = 0; j < 24; j += 4)
		{
			scene::IMeshBuffer *buf = dst_mesh->getMeshBuffer(j / 4);
			buf->append(vertices + j, 4, indices, 6);
		}
	}
	return dst_mesh;
}