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minetest/src/mesh.cpp

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/*
Minetest-c55
Copyright (C) 2010-2011 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 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.
*/
#include "mesh.h"
#include "log.h"
#include <cassert>
#include <iostream>
#include <IAnimatedMesh.h>
#include <SAnimatedMesh.h>
#include <ICameraSceneNode.h>
// In Irrlicht 1.8 the signature of ITexture::lock was changed from
// (bool, u32) to (E_TEXTURE_LOCK_MODE, u32).
#if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR <= 7
#define MY_ETLM_READ_ONLY true
#else
#define MY_ETLM_READ_ONLY video::ETLM_READ_ONLY
#endif
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;
}
static scene::IAnimatedMesh* extrudeARGB(u32 twidth, u32 theight, u8 *data)
{
const s32 argb_wstep = 4 * twidth;
const s32 alpha_threshold = 1;
scene::IMeshBuffer *buf = new scene::SMeshBuffer();
video::SColor c(255,255,255,255);
// Front and back
{
video::S3DVertex vertices[8] =
{
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),
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, 1,0),
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, 0,1),
};
u16 indices[12] = {0,1,2,2,3,0,4,5,6,6,7,4};
buf->append(vertices, 8, indices, 12);
}
// "Interior"
// (add faces where a solid pixel is next to a transparent one)
u8 *solidity = new u8[(twidth+2) * (theight+2)];
u32 wstep = twidth + 2;
for (u32 y = 0; y < theight + 2; ++y)
{
u8 *scanline = solidity + y * wstep;
if (y == 0 || y == theight + 1)
{
for (u32 x = 0; x < twidth + 2; ++x)
scanline[x] = 0;
}
else
{
scanline[0] = 0;
u8 *argb_scanline = data + (y - 1) * argb_wstep;
for (u32 x = 0; x < twidth; ++x)
scanline[x+1] = (argb_scanline[x*4+3] >= alpha_threshold);
scanline[twidth + 1] = 0;
}
}
// without this, there would be occasional "holes" in the mesh
f32 eps = 0.01;
for (u32 y = 0; y <= theight; ++y)
{
u8 *scanline = solidity + y * wstep + 1;
for (u32 x = 0; x <= twidth; ++x)
{
if (scanline[x] && !scanline[x + wstep])
{
u32 xx = x + 1;
while (scanline[xx] && !scanline[xx + wstep])
++xx;
f32 vx1 = (x - eps) / (f32) twidth - 0.5;
f32 vx2 = (xx + eps) / (f32) twidth - 0.5;
f32 vy = 0.5 - (y - eps) / (f32) theight;
f32 tx1 = x / (f32) twidth;
f32 tx2 = xx / (f32) twidth;
f32 ty = (y - 0.5) / (f32) theight;
video::S3DVertex vertices[8] =
{
video::S3DVertex(vx1,vy,-0.5, 0,-1,0, c, tx1,ty),
video::S3DVertex(vx2,vy,-0.5, 0,-1,0, c, tx2,ty),
video::S3DVertex(vx2,vy,+0.5, 0,-1,0, c, tx2,ty),
video::S3DVertex(vx1,vy,+0.5, 0,-1,0, c, tx1,ty),
};
u16 indices[6] = {0,1,2,2,3,0};
buf->append(vertices, 4, indices, 6);
x = xx - 1;
}
if (!scanline[x] && scanline[x + wstep])
{
u32 xx = x + 1;
while (!scanline[xx] && scanline[xx + wstep])
++xx;
f32 vx1 = (x - eps) / (f32) twidth - 0.5;
f32 vx2 = (xx + eps) / (f32) twidth - 0.5;
f32 vy = 0.5 - (y + eps) / (f32) theight;
f32 tx1 = x / (f32) twidth;
f32 tx2 = xx / (f32) twidth;
f32 ty = (y + 0.5) / (f32) theight;
video::S3DVertex vertices[8] =
{
video::S3DVertex(vx1,vy,-0.5, 0,1,0, c, tx1,ty),
video::S3DVertex(vx1,vy,+0.5, 0,1,0, c, tx1,ty),
video::S3DVertex(vx2,vy,+0.5, 0,1,0, c, tx2,ty),
video::S3DVertex(vx2,vy,-0.5, 0,1,0, c, tx2,ty),
};
u16 indices[6] = {0,1,2,2,3,0};
buf->append(vertices, 4, indices, 6);
x = xx - 1;
}
}
}
for (u32 x = 0; x <= twidth; ++x)
{
u8 *scancol = solidity + x + wstep;
for (u32 y = 0; y <= theight; ++y)
{
if (scancol[y * wstep] && !scancol[y * wstep + 1])
{
u32 yy = y + 1;
while (scancol[yy * wstep] && !scancol[yy * wstep + 1])
++yy;
f32 vx = (x - eps) / (f32) twidth - 0.5;
f32 vy1 = 0.5 - (y - eps) / (f32) theight;
f32 vy2 = 0.5 - (yy + eps) / (f32) theight;
f32 tx = (x - 0.5) / (f32) twidth;
f32 ty1 = y / (f32) theight;
f32 ty2 = yy / (f32) theight;
video::S3DVertex vertices[8] =
{
video::S3DVertex(vx,vy1,-0.5, 1,0,0, c, tx,ty1),
video::S3DVertex(vx,vy1,+0.5, 1,0,0, c, tx,ty1),
video::S3DVertex(vx,vy2,+0.5, 1,0,0, c, tx,ty2),
video::S3DVertex(vx,vy2,-0.5, 1,0,0, c, tx,ty2),
};
u16 indices[6] = {0,1,2,2,3,0};
buf->append(vertices, 4, indices, 6);
y = yy - 1;
}
if (!scancol[y * wstep] && scancol[y * wstep + 1])
{
u32 yy = y + 1;
while (!scancol[yy * wstep] && scancol[yy * wstep + 1])
++yy;
f32 vx = (x + eps) / (f32) twidth - 0.5;
f32 vy1 = 0.5 - (y - eps) / (f32) theight;
f32 vy2 = 0.5 - (yy + eps) / (f32) theight;
f32 tx = (x + 0.5) / (f32) twidth;
f32 ty1 = y / (f32) theight;
f32 ty2 = yy / (f32) theight;
video::S3DVertex vertices[8] =
{
video::S3DVertex(vx,vy1,-0.5, -1,0,0, c, tx,ty1),
video::S3DVertex(vx,vy2,-0.5, -1,0,0, c, tx,ty2),
video::S3DVertex(vx,vy2,+0.5, -1,0,0, c, tx,ty2),
video::S3DVertex(vx,vy1,+0.5, -1,0,0, c, tx,ty1),
};
u16 indices[6] = {0,1,2,2,3,0};
buf->append(vertices, 4, indices, 6);
y = yy - 1;
}
}
}
// Add to mesh
scene::SMesh *mesh = new scene::SMesh();
mesh->addMeshBuffer(buf);
buf->drop();
scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
mesh->drop();
return anim_mesh;
}
scene::IAnimatedMesh* createExtrudedMesh(video::ITexture *texture,
video::IVideoDriver *driver, v3f scale)
{
scene::IAnimatedMesh *mesh = NULL;
core::dimension2d<u32> size = texture->getSize();
video::ECOLOR_FORMAT format = texture->getColorFormat();
if (format == video::ECF_A8R8G8B8)
{
// Texture is in the correct color format, we can pass it
// to extrudeARGB right away.
void *data = texture->lock(MY_ETLM_READ_ONLY);
if (data == NULL)
return NULL;
mesh = extrudeARGB(size.Width, size.Height, (u8*) data);
texture->unlock();
}
else
{
video::IImage *img1 = driver->createImageFromData(format, size, texture->lock(MY_ETLM_READ_ONLY));
if (img1 == NULL)
return NULL;
// img1 is in the texture's color format, convert to 8-bit ARGB
video::IImage *img2 = driver->createImage(video::ECF_A8R8G8B8, size);
if (img2 != NULL)
{
img1->copyTo(img2);
img1->drop();
mesh = extrudeARGB(size.Width, size.Height, (u8*) img2->lock());
img2->unlock();
img2->drop();
}
img1->drop();
}
// Set default material
mesh->getMeshBuffer(0)->getMaterial().setTexture(0, texture);
mesh->getMeshBuffer(0)->getMaterial().setFlag(video::EMF_LIGHTING, false);
mesh->getMeshBuffer(0)->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
mesh->getMeshBuffer(0)->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
scaleMesh(mesh, scale); // also recalculates bounding box
return mesh;
}
void scaleMesh(scene::IMesh *mesh, v3f scale)
{
if(mesh == NULL)
return;
core::aabbox3d<f32> bbox;
bbox.reset(0,0,0);
u16 mc = mesh->getMeshBufferCount();
for(u16 j=0; j<mc; j++)
{
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
u16 vc = buf->getVertexCount();
for(u16 i=0; i<vc; i++)
{
vertices[i].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;
core::aabbox3d<f32> bbox;
bbox.reset(0,0,0);
u16 mc = mesh->getMeshBufferCount();
for(u16 j=0; j<mc; j++)
{
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
u16 vc = buf->getVertexCount();
for(u16 i=0; i<vc; i++)
{
vertices[i].Pos += vec;
}
buf->recalculateBoundingBox();
// calculate total bounding box
if(j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
mesh->setBoundingBox(bbox);
}
void setMeshColor(scene::IMesh *mesh, const video::SColor &color)
{
if(mesh == NULL)
return;
u16 mc = mesh->getMeshBufferCount();
for(u16 j=0; j<mc; j++)
{
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
u16 vc = buf->getVertexCount();
for(u16 i=0; i<vc; i++)
{
vertices[i].Color = color;
}
}
}
void setMeshColorByNormalXYZ(scene::IMesh *mesh,
const video::SColor &colorX,
const video::SColor &colorY,
const video::SColor &colorZ)
{
if(mesh == NULL)
return;
u16 mc = mesh->getMeshBufferCount();
for(u16 j=0; j<mc; j++)
{
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
u16 vc = buf->getVertexCount();
for(u16 i=0; i<vc; i++)
{
f32 x = fabs(vertices[i].Normal.X);
f32 y = fabs(vertices[i].Normal.Y);
f32 z = fabs(vertices[i].Normal.Z);
if(x >= y && x >= z)
vertices[i].Color = colorX;
else if(y >= z)
vertices[i].Color = colorY;
else
vertices[i].Color = colorZ;
}
}
}
video::ITexture *generateTextureFromMesh(scene::IMesh *mesh,
IrrlichtDevice *device,
core::dimension2d<u32> dim,
std::string texture_name,
v3f camera_position,
v3f camera_lookat,
core::CMatrix4<f32> camera_projection_matrix,
video::SColorf ambient_light,
v3f light_position,
video::SColorf light_color,
f32 light_radius)
{
video::IVideoDriver *driver = device->getVideoDriver();
if(driver->queryFeature(video::EVDF_RENDER_TO_TARGET) == false)
{
static bool warned = false;
if(!warned)
{
errorstream<<"generateTextureFromMesh(): EVDF_RENDER_TO_TARGET"
" not supported."<<std::endl;
warned = true;
}
return NULL;
}
// Create render target texture
video::ITexture *rtt = driver->addRenderTargetTexture(
dim, texture_name.c_str(), video::ECF_A8R8G8B8);
if(rtt == NULL)
{
errorstream<<"generateTextureFromMesh(): addRenderTargetTexture"
" returned NULL."<<std::endl;
return NULL;
}
// Set render target
driver->setRenderTarget(rtt, true, true, video::SColor(0,0,0,0));
// Get a scene manager
scene::ISceneManager *smgr_main = device->getSceneManager();
assert(smgr_main);
scene::ISceneManager *smgr = smgr_main->createNewSceneManager();
assert(smgr);
scene::IMeshSceneNode* meshnode = smgr->addMeshSceneNode(mesh, NULL, -1, v3f(0,0,0), v3f(0,0,0), v3f(1,1,1), true);
meshnode->setMaterialFlag(video::EMF_LIGHTING, true);
meshnode->setMaterialFlag(video::EMF_ANTI_ALIASING, true);
meshnode->setMaterialFlag(video::EMF_BILINEAR_FILTER, true);
scene::ICameraSceneNode* camera = smgr->addCameraSceneNode(0,
camera_position, camera_lookat);
// second parameter of setProjectionMatrix (isOrthogonal) is ignored
camera->setProjectionMatrix(camera_projection_matrix, false);
smgr->setAmbientLight(ambient_light);
smgr->addLightSceneNode(0, light_position, light_color, light_radius);
// Render scene
driver->beginScene(true, true, video::SColor(0,0,0,0));
smgr->drawAll();
driver->endScene();
// NOTE: The scene nodes should not be dropped, otherwise
// smgr->drop() segfaults
/*cube->drop();
camera->drop();
light->drop();*/
// Drop scene manager
smgr->drop();
// Unset render target
driver->setRenderTarget(0, true, true, 0);
return rtt;
}
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