273 lines
7.3 KiB
C++
273 lines
7.3 KiB
C++
/**
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* @file llmeshreduction.cpp
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* @brief LLMeshReduction class implementation
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*
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* $LicenseInfo:firstyear=2004&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "llviewerprecompiledheaders.h"
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#include "llmeshreduction.h"
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#include "llgl.h"
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#include "llvertexbuffer.h"
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#include "glod/glod.h"
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#if 0 //not used ?
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void create_vertex_buffers_from_model(LLModel* model, std::vector<LLPointer <LLVertexBuffer> >& vertex_buffers)
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{
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#if 0 //VECTORIZE THIS ?
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vertex_buffers.clear();
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for (S32 i = 0; i < model->getNumVolumeFaces(); ++i)
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{
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const LLVolumeFace &vf = model->getVolumeFace(i);
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U32 num_vertices = vf.mNumVertices;
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U32 num_indices = vf.mNumIndices;
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if (!num_vertices || ! num_indices)
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{
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continue;
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}
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LLVertexBuffer* vb =
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new LLVertexBuffer(LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0, 0);
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vb->allocateBuffer(num_vertices, num_indices, TRUE);
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LLStrider<LLVector3> vertex_strider;
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LLStrider<LLVector3> normal_strider;
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LLStrider<LLVector2> tc_strider;
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LLStrider<U16> index_strider;
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vb->getVertexStrider(vertex_strider);
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vb->getNormalStrider(normal_strider);
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vb->getTexCoord0Strider(tc_strider);
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vb->getIndexStrider(index_strider);
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// build vertices and normals
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for (U32 i = 0; (S32)i < num_vertices; i++)
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{
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*(vertex_strider++) = vf.mVertices[i].mPosition;
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*(tc_strider++) = vf.mVertices[i].mTexCoord;
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LLVector3 normal = vf.mVertices[i].mNormal;
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normal.normalize();
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*(normal_strider++) = normal;
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}
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// build indices
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for (U32 i = 0; i < num_indices; i++)
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{
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*(index_strider++) = vf.mIndices[i];
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}
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vertex_buffers.push_back(vb);
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}
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#endif
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}
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void create_glod_object_from_vertex_buffers(S32 object, S32 group, std::vector<LLPointer <LLVertexBuffer> >& vertex_buffers)
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{
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glodNewGroup(group);
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stop_gloderror();
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glodNewObject(object, group, GLOD_DISCRETE);
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stop_gloderror();
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for (U32 i = 0; i < vertex_buffers.size(); ++i)
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{
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vertex_buffers[i]->setBuffer(LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0);
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U32 num_indices = vertex_buffers[i]->getNumIndices();
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if (num_indices > 2)
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{
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glodInsertElements(object, i, GL_TRIANGLES, num_indices, GL_UNSIGNED_SHORT,
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vertex_buffers[i]->getIndicesPointer(), 0, 0.f);
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}
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stop_gloderror();
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}
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glodBuildObject(object);
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stop_gloderror();
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}
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// extract the GLOD data into vertex buffers
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void create_vertex_buffers_from_glod_object(S32 object, S32 group, std::vector<LLPointer <LLVertexBuffer> >& vertex_buffers)
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{
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vertex_buffers.clear();
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GLint patch_count = 0;
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glodGetObjectParameteriv(object, GLOD_NUM_PATCHES, &patch_count);
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stop_gloderror();
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GLint* sizes = new GLint[patch_count*2];
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glodGetObjectParameteriv(object, GLOD_PATCH_SIZES, sizes);
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stop_gloderror();
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GLint* names = new GLint[patch_count];
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glodGetObjectParameteriv(object, GLOD_PATCH_NAMES, names);
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stop_gloderror();
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for (S32 i = 0; i < patch_count; i++)
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{
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LLPointer<LLVertexBuffer> buff =
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new LLVertexBuffer(LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0, 0);
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if (sizes[i*2+1] > 0 && sizes[i*2] > 0)
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{
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buff->allocateBuffer(sizes[i*2+1], sizes[i*2], true);
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buff->setBuffer(LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0);
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glodFillElements(object, names[i], GL_UNSIGNED_SHORT, buff->getIndicesPointer());
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stop_gloderror();
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}
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else
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{
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// this face was eliminated, create a dummy triangle (one vertex, 3 indices, all 0)
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buff->allocateBuffer(1, 3, true);
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}
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vertex_buffers.push_back(buff);
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}
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glodDeleteObject(object);
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stop_gloderror();
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glodDeleteGroup(group);
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stop_gloderror();
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delete [] sizes;
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delete [] names;
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}
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LLPointer<LLModel> create_model_from_vertex_buffers(std::vector<LLPointer <LLVertexBuffer> >& vertex_buffers)
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{
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// extract the newly reduced mesh
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// create our output model
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LLVolumeParams volume_params;
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volume_params.setType(LL_PCODE_PROFILE_SQUARE, LL_PCODE_PATH_LINE);
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LLPointer<LLModel> out_model = new LLModel(volume_params, 0.f);
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out_model->setNumVolumeFaces(vertex_buffers.size());
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// build new faces from each vertex buffer
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for (GLint i = 0; i < vertex_buffers.size(); ++i)
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{
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LLStrider<LLVector3> pos;
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LLStrider<LLVector3> norm;
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LLStrider<LLVector2> tc;
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LLStrider<U16> index;
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vertex_buffers[i]->getVertexStrider(pos);
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vertex_buffers[i]->getNormalStrider(norm);
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vertex_buffers[i]->getTexCoord0Strider(tc);
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vertex_buffers[i]->getIndexStrider(index);
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out_model->setVolumeFaceData(i, pos, norm, tc, index,
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vertex_buffers[i]->getNumVerts(), vertex_buffers[i]->getNumIndices());
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}
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return out_model;
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}
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LLMeshReduction::LLMeshReduction()
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{
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mCounter = 1;
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glodInit();
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}
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LLMeshReduction::~LLMeshReduction()
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{
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glodShutdown();
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}
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LLPointer<LLModel> LLMeshReduction::reduce(LLModel* in_model, F32 limit, S32 mode)
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{
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LLVertexBuffer::unbind();
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// create vertex buffers from model
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std::vector<LLPointer<LLVertexBuffer> > in_vertex_buffers;
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create_vertex_buffers_from_model(in_model, in_vertex_buffers);
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// create glod object from vertex buffers
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stop_gloderror();
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S32 glod_group = mCounter++;
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S32 glod_object = mCounter++;
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create_glod_object_from_vertex_buffers(glod_object, glod_group, in_vertex_buffers);
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// set reduction parameters
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stop_gloderror();
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if (mode == TRIANGLE_BUDGET)
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{
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// triangle budget mode
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glodGroupParameteri(glod_group, GLOD_ADAPT_MODE, GLOD_TRIANGLE_BUDGET);
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stop_gloderror();
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glodGroupParameteri(glod_group, GLOD_ERROR_MODE, GLOD_OBJECT_SPACE_ERROR);
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stop_gloderror();
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S32 triangle_count = (S32)limit;
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glodGroupParameteri(glod_group, GLOD_MAX_TRIANGLES, triangle_count);
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stop_gloderror();
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}
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else if (mode == ERROR_THRESHOLD)
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{
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// error threshold mode
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glodGroupParameteri(glod_group, GLOD_ADAPT_MODE, GLOD_ERROR_THRESHOLD);
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glodGroupParameteri(glod_group, GLOD_ERROR_MODE, GLOD_OBJECT_SPACE_ERROR);
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F32 error_threshold = limit;
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glodGroupParameterf(glod_group, GLOD_OBJECT_SPACE_ERROR_THRESHOLD, error_threshold);
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stop_gloderror();
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}
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else
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{
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// not a legal mode
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return NULL;
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}
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// do the reduction
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glodAdaptGroup(glod_group);
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stop_gloderror();
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// convert glod object into vertex buffers
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std::vector<LLPointer<LLVertexBuffer> > out_vertex_buffers;
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create_vertex_buffers_from_glod_object(glod_object, glod_group, out_vertex_buffers);
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// convert vertex buffers into a model
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LLPointer<LLModel> out_model = create_model_from_vertex_buffers(out_vertex_buffers);
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return out_model;
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}
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#endif
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