dungeon_crawler

annotate prototype/src/mesh.cc @ 2:1f61f2a02832

find changesets by author, revision, files, or words in the commit message
added mesh class
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 09 Aug 2012 06:20:27 +0300
parents
children 158de53b4e18
rev   line source
nuclear@2 1 #include "mesh.h"
nuclear@2 2 #include "opengl.h"
nuclear@2 3
nuclear@2 4 Mesh::Mesh()
nuclear@2 5 {
nuclear@2 6 nverts = nfaces = 0;
nuclear@2 7 for(int i=0; i<NUM_MESH_ATTR; i++) {
nuclear@2 8 vbo[i] = 0;
nuclear@2 9 }
nuclear@2 10 ibo = 0;
nuclear@2 11 tang_loc = -1;
nuclear@2 12 }
nuclear@2 13
nuclear@2 14 Mesh::~Mesh()
nuclear@2 15 {
nuclear@2 16 destroy();
nuclear@2 17 }
nuclear@2 18
nuclear@2 19 bool Mesh::create(const aiScene *scn, aiMesh *aim)
nuclear@2 20 {
nuclear@2 21 if(vbo[MESH_ATTR_VERTEX]) {
nuclear@2 22 destroy();
nuclear@2 23 }
nuclear@2 24
nuclear@2 25 nverts = aim->mNumVertices;
nuclear@2 26 nfaces = aim->mNumFaces;
nuclear@2 27
nuclear@2 28 glGenBuffers(1, vbo + MESH_ATTR_VERTEX);
nuclear@2 29 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@2 30 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mVertices, aim->mVertices, GL_STATIC_DRAW);
nuclear@2 31
nuclear@2 32 if(aim->mNormals) {
nuclear@2 33 glGenBuffers(1, vbo + MESH_ATTR_NORMAL);
nuclear@2 34 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@2 35 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mNormals, aim->mNormals, GL_STATIC_DRAW);
nuclear@2 36 }
nuclear@2 37 if(aim->mTangents) {
nuclear@2 38 glGenBuffers(1, vbo + MESH_ATTR_TANGENT);
nuclear@2 39 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@2 40 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTangents, aim->mTangents, GL_STATIC_DRAW);
nuclear@2 41 }
nuclear@2 42 if(aim->mTextureCoords[0]) {
nuclear@2 43 glGenBuffers(1, vbo + MESH_ATTR_TEXCOORD);
nuclear@2 44 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@2 45 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTextureCoords[0], aim->mTextureCoords[0], GL_STATIC_DRAW);
nuclear@2 46 }
nuclear@2 47
nuclear@2 48 glGenBuffers(1, &ibo);
nuclear@2 49 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
nuclear@2 50 glBufferData(GL_ELEMENT_ARRAY_BUFFER, nfaces * 3 * sizeof *aim->mFaces[0].mIndices, 0, GL_STATIC_DRAW);
nuclear@2 51
nuclear@2 52 /* map the buffer and fill it up */
nuclear@2 53 unsigned int *iptr = (unsigned int*)glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
nuclear@2 54
nuclear@2 55 for(int i=0; i<nfaces; i++) {
nuclear@2 56 for(int j=0; j<3; j++) {
nuclear@2 57 *iptr++ = aim->mFaces[i].mIndices[j];
nuclear@2 58 }
nuclear@2 59 }
nuclear@2 60 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
nuclear@2 61 return true;
nuclear@2 62 }
nuclear@2 63
nuclear@2 64 void Mesh::destroy()
nuclear@2 65 {
nuclear@2 66 for(int i=0; i<NUM_MESH_ATTR; i++) {
nuclear@2 67 if(vbo[i]) {
nuclear@2 68 glDeleteBuffers(1, vbo + i);
nuclear@2 69 vbo[i] = 0;
nuclear@2 70 }
nuclear@2 71 }
nuclear@2 72 glDeleteBuffers(1, &ibo);
nuclear@2 73 ibo = 0;
nuclear@2 74
nuclear@2 75 nverts = nfaces = 0;
nuclear@2 76 tang_loc = -1;
nuclear@2 77 }
nuclear@2 78
nuclear@2 79 void Mesh::set_attrib_location(int attr, int loc)
nuclear@2 80 {
nuclear@2 81 if(attr == MESH_ATTR_TANGENT) {
nuclear@2 82 tang_loc = loc;
nuclear@2 83 }
nuclear@2 84 }
nuclear@2 85
nuclear@2 86 int Mesh::get_attrib_location(int attr) const
nuclear@2 87 {
nuclear@2 88 return tang_loc;
nuclear@2 89 }
nuclear@2 90
nuclear@2 91 void Mesh::draw() const
nuclear@2 92 {
nuclear@2 93 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@2 94 glVertexPointer(3, GL_FLOAT, 0, 0);
nuclear@2 95 glEnableClientState(GL_VERTEX_ARRAY);
nuclear@2 96
nuclear@2 97 if(vbo[MESH_ATTR_NORMAL]) {
nuclear@2 98 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@2 99 glNormalPointer(GL_FLOAT, 0, 0);
nuclear@2 100 glEnableClientState(GL_NORMAL_ARRAY);
nuclear@2 101 }
nuclear@2 102 if(vbo[MESH_ATTR_TANGENT] && tang_loc >= 0) {
nuclear@2 103 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@2 104 glVertexAttribPointer(tang_loc, 3, GL_FLOAT, GL_FALSE, 0, 0);
nuclear@2 105 glEnableVertexAttribArray(tang_loc);
nuclear@2 106 }
nuclear@2 107 if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@2 108 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@2 109 glTexCoordPointer(3, GL_FLOAT, 0, 0);
nuclear@2 110 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@2 111 }
nuclear@2 112
nuclear@2 113 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
nuclear@2 114 glDrawElements(GL_TRIANGLES, nfaces * 3, GL_UNSIGNED_INT, 0);
nuclear@2 115
nuclear@2 116 glDisableClientState(GL_VERTEX_ARRAY);
nuclear@2 117 glDisableClientState(GL_NORMAL_ARRAY);
nuclear@2 118 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@2 119 if(tang_loc >= 0) {
nuclear@2 120 glDisableVertexAttribArray(tang_loc);
nuclear@2 121 }
nuclear@2 122 }