dungeon_crawler

annotate prototype/src/mesh.cc @ 35:d0e93b4d9ec9

find changesets by author, revision, files, or words in the commit message
normal mapping
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 28 Aug 2012 06:28:22 +0300
parents cbf86e5198a9
children 84a56fb24850
rev   line source
nuclear@10 1 #include <stdio.h>
nuclear@10 2 #include <stdlib.h>
nuclear@2 3 #include "mesh.h"
nuclear@2 4 #include "opengl.h"
nuclear@2 5
nuclear@10 6 /*
nuclear@10 7 #define DBG_NORMALS
nuclear@10 8 #define NSZ 0.1
nuclear@10 9 */
nuclear@10 10
nuclear@2 11 Mesh::Mesh()
nuclear@2 12 {
nuclear@2 13 nverts = nfaces = 0;
nuclear@2 14 for(int i=0; i<NUM_MESH_ATTR; i++) {
nuclear@2 15 vbo[i] = 0;
nuclear@2 16 }
nuclear@2 17 ibo = 0;
nuclear@2 18 tang_loc = -1;
nuclear@2 19 }
nuclear@2 20
nuclear@2 21 Mesh::~Mesh()
nuclear@2 22 {
nuclear@2 23 destroy();
nuclear@2 24 }
nuclear@2 25
nuclear@7 26 void Mesh::set_name(const char *name)
nuclear@7 27 {
nuclear@7 28 this->name = name;
nuclear@7 29 }
nuclear@7 30
nuclear@4 31 const char *Mesh::get_name() const
nuclear@4 32 {
nuclear@4 33 return name.c_str();
nuclear@4 34 }
nuclear@4 35
nuclear@2 36 bool Mesh::create(const aiScene *scn, aiMesh *aim)
nuclear@2 37 {
nuclear@2 38 if(vbo[MESH_ATTR_VERTEX]) {
nuclear@2 39 destroy();
nuclear@2 40 }
nuclear@2 41
nuclear@5 42 name = aim->mName.data;
nuclear@5 43
nuclear@2 44 nverts = aim->mNumVertices;
nuclear@2 45 nfaces = aim->mNumFaces;
nuclear@2 46
nuclear@2 47 glGenBuffers(1, vbo + MESH_ATTR_VERTEX);
nuclear@2 48 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@2 49 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mVertices, aim->mVertices, GL_STATIC_DRAW);
nuclear@2 50
nuclear@2 51 if(aim->mNormals) {
nuclear@2 52 glGenBuffers(1, vbo + MESH_ATTR_NORMAL);
nuclear@2 53 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@2 54 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mNormals, aim->mNormals, GL_STATIC_DRAW);
nuclear@2 55 }
nuclear@2 56 if(aim->mTangents) {
nuclear@2 57 glGenBuffers(1, vbo + MESH_ATTR_TANGENT);
nuclear@2 58 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@2 59 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTangents, aim->mTangents, GL_STATIC_DRAW);
nuclear@2 60 }
nuclear@2 61 if(aim->mTextureCoords[0]) {
nuclear@2 62 glGenBuffers(1, vbo + MESH_ATTR_TEXCOORD);
nuclear@2 63 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@2 64 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTextureCoords[0], aim->mTextureCoords[0], GL_STATIC_DRAW);
nuclear@2 65 }
nuclear@2 66
nuclear@2 67 glGenBuffers(1, &ibo);
nuclear@2 68 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
nuclear@2 69 glBufferData(GL_ELEMENT_ARRAY_BUFFER, nfaces * 3 * sizeof *aim->mFaces[0].mIndices, 0, GL_STATIC_DRAW);
nuclear@2 70
nuclear@2 71 /* map the buffer and fill it up */
nuclear@2 72 unsigned int *iptr = (unsigned int*)glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
nuclear@2 73
nuclear@4 74 for(int i=0; i<(int)nfaces; i++) {
nuclear@2 75 for(int j=0; j<3; j++) {
nuclear@2 76 *iptr++ = aim->mFaces[i].mIndices[j];
nuclear@2 77 }
nuclear@2 78 }
nuclear@2 79 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
nuclear@27 80 glBindBuffer(GL_ARRAY_BUFFER, 0);
nuclear@27 81 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
nuclear@2 82 return true;
nuclear@2 83 }
nuclear@2 84
nuclear@2 85 void Mesh::destroy()
nuclear@2 86 {
nuclear@2 87 for(int i=0; i<NUM_MESH_ATTR; i++) {
nuclear@2 88 if(vbo[i]) {
nuclear@2 89 glDeleteBuffers(1, vbo + i);
nuclear@2 90 vbo[i] = 0;
nuclear@2 91 }
nuclear@2 92 }
nuclear@2 93 glDeleteBuffers(1, &ibo);
nuclear@2 94 ibo = 0;
nuclear@2 95
nuclear@2 96 nverts = nfaces = 0;
nuclear@2 97 tang_loc = -1;
nuclear@2 98 }
nuclear@2 99
nuclear@7 100 void Mesh::set_xform(const Matrix4x4 &mat)
nuclear@7 101 {
nuclear@7 102 xform = mat;
nuclear@7 103 }
nuclear@7 104
nuclear@7 105 const Matrix4x4 &Mesh::get_xform() const
nuclear@7 106 {
nuclear@7 107 return xform;
nuclear@7 108 }
nuclear@7 109
nuclear@11 110 void Mesh::set_material(const Material &mat)
nuclear@11 111 {
nuclear@11 112 this->mat = mat;
nuclear@11 113 }
nuclear@11 114
nuclear@11 115 const Material &Mesh::get_material() const
nuclear@11 116 {
nuclear@11 117 return mat;
nuclear@11 118 }
nuclear@11 119
nuclear@2 120 void Mesh::set_attrib_location(int attr, int loc)
nuclear@2 121 {
nuclear@2 122 if(attr == MESH_ATTR_TANGENT) {
nuclear@2 123 tang_loc = loc;
nuclear@2 124 }
nuclear@2 125 }
nuclear@2 126
nuclear@2 127 int Mesh::get_attrib_location(int attr) const
nuclear@2 128 {
nuclear@2 129 return tang_loc;
nuclear@2 130 }
nuclear@2 131
nuclear@2 132 void Mesh::draw() const
nuclear@2 133 {
nuclear@11 134 mat.setup();
nuclear@11 135
nuclear@7 136 glMatrixMode(GL_MODELVIEW);
nuclear@7 137 glPushMatrix();
nuclear@7 138 mult_matrix(xform);
nuclear@7 139
nuclear@2 140 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@2 141 glVertexPointer(3, GL_FLOAT, 0, 0);
nuclear@2 142 glEnableClientState(GL_VERTEX_ARRAY);
nuclear@2 143
nuclear@2 144 if(vbo[MESH_ATTR_NORMAL]) {
nuclear@2 145 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@2 146 glNormalPointer(GL_FLOAT, 0, 0);
nuclear@2 147 glEnableClientState(GL_NORMAL_ARRAY);
nuclear@2 148 }
nuclear@2 149 if(vbo[MESH_ATTR_TANGENT] && tang_loc >= 0) {
nuclear@2 150 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@2 151 glVertexAttribPointer(tang_loc, 3, GL_FLOAT, GL_FALSE, 0, 0);
nuclear@2 152 glEnableVertexAttribArray(tang_loc);
nuclear@2 153 }
nuclear@2 154 if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@2 155 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@2 156 glTexCoordPointer(3, GL_FLOAT, 0, 0);
nuclear@2 157 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@2 158 }
nuclear@2 159
nuclear@2 160 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
nuclear@2 161 glDrawElements(GL_TRIANGLES, nfaces * 3, GL_UNSIGNED_INT, 0);
nuclear@2 162
nuclear@2 163 glDisableClientState(GL_VERTEX_ARRAY);
nuclear@2 164 glDisableClientState(GL_NORMAL_ARRAY);
nuclear@2 165 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@2 166 if(tang_loc >= 0) {
nuclear@2 167 glDisableVertexAttribArray(tang_loc);
nuclear@2 168 }
nuclear@7 169
nuclear@27 170 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
nuclear@27 171
nuclear@10 172 #ifdef DBG_NORMALS
nuclear@10 173 glPushAttrib(GL_ENABLE_BIT);
nuclear@10 174 glDisable(GL_LIGHTING);
nuclear@10 175
nuclear@10 176 int prog;
nuclear@10 177 glGetIntegerv(GL_CURRENT_PROGRAM, &prog);
nuclear@10 178 glUseProgram(0);
nuclear@10 179
nuclear@35 180 Vector3 *varr, *narr, *tarr;
nuclear@10 181
nuclear@10 182 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@10 183 varr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
nuclear@10 184
nuclear@10 185 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@10 186 narr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
nuclear@10 187
nuclear@35 188 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@35 189 tarr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
nuclear@35 190
nuclear@10 191 glBegin(GL_LINES);
nuclear@10 192 for(unsigned int i=0; i<nverts; i++) {
nuclear@10 193 glColor3f(0, 1, 0);
nuclear@10 194 glVertex3f(varr->x, varr->y, varr->z);
nuclear@10 195 glVertex3f(varr->x + narr->x * NSZ, varr->y + narr->y * NSZ, varr->z + narr->z * NSZ);
nuclear@35 196
nuclear@35 197 glColor3f(1, 1, 0);
nuclear@35 198 glVertex3f(varr->x, varr->y, varr->z);
nuclear@35 199 glVertex3f(varr->x + tarr->x * NSZ, varr->y + tarr->y * NSZ, varr->z + tarr->z * NSZ);
nuclear@10 200 varr++;
nuclear@10 201 narr++;
nuclear@35 202 tarr++;
nuclear@10 203 }
nuclear@10 204 glEnd();
nuclear@10 205
nuclear@10 206 glUnmapBuffer(GL_ARRAY_BUFFER);
nuclear@35 207 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@35 208 glUnmapBuffer(GL_ARRAY_BUFFER);
nuclear@10 209 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@10 210 glUnmapBuffer(GL_ARRAY_BUFFER);
nuclear@10 211
nuclear@10 212 glUseProgram(prog);
nuclear@10 213 glPopAttrib();
nuclear@10 214 #endif
nuclear@10 215
nuclear@27 216 glBindBuffer(GL_ARRAY_BUFFER, 0);
nuclear@27 217
nuclear@7 218 glPopMatrix();
nuclear@2 219 }
nuclear@21 220
nuclear@21 221
nuclear@21 222 void Mesh::calc_bsph()
nuclear@21 223 {
nuclear@21 224 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@21 225 Vector3 *varr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
nuclear@21 226
nuclear@21 227 bsph_center = Vector3(0, 0, 0);
nuclear@21 228
nuclear@21 229 for(unsigned int i=0; i<nverts; i++) {
nuclear@21 230 bsph_center += varr[i];
nuclear@21 231 }
nuclear@21 232 bsph_center /= (float)nverts;
nuclear@21 233
nuclear@21 234 // assume all vertices are equidistant from the center
nuclear@21 235 bsph_rad = (varr[0] - bsph_center).length();
nuclear@21 236
nuclear@21 237 glUnmapBuffer(GL_ARRAY_BUFFER);
nuclear@21 238 bsph_valid = true;
nuclear@21 239 }
nuclear@21 240
nuclear@21 241 const Vector3 &Mesh::get_bsph_center() const
nuclear@21 242 {
nuclear@21 243 if(!bsph_valid) {
nuclear@21 244 ((Mesh*)this)->calc_bsph();
nuclear@21 245 }
nuclear@21 246 return bsph_center;
nuclear@21 247 }
nuclear@21 248
nuclear@21 249 float Mesh::get_bsph_radius() const
nuclear@21 250 {
nuclear@21 251 if(!bsph_valid) {
nuclear@21 252 ((Mesh*)this)->calc_bsph();
nuclear@21 253 }
nuclear@21 254 return bsph_rad;
nuclear@21 255 }