dungeon_crawler: a373b36ffc17 prototype/src/mesh.cc

dungeon_crawler

view prototype/src/mesh.cc @ 80:a373b36ffc17

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 27 Oct 2012 01:59:39 +0300
parents	6a471c87f9ca
children

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include "mesh.h"

4 #include "opengl.h"

6 /*

7 #define DBG_NORMALS

8 #define NSZ 0.1

9 */

11 Mesh::Mesh()

12 {

13 nverts = nfaces = 0;

14 for(int i=0; i<NUM_MESH_ATTR; i++) {

15 vbo[i] = 0;

16 }

17 ibo = 0;

18 tang_loc = -1;

20 bsph_valid = false;

21 }

23 Mesh::~Mesh()

24 {

25 destroy();

26 }

28 void Mesh::set_name(const char *name)

29 {

30 this->name = name;

31 }

33 const char *Mesh::get_name() const

34 {

35 return name.c_str();

36 }

38 bool Mesh::create(const aiScene *scn, aiMesh *aim)

39 {

40 if(aim->mPrimitiveTypes != aiPrimitiveType_TRIANGLE) {

41 fprintf(stderr, "%s: non-triangle mesh!? primtype mask: %x\n", __FUNCTION__, aim->mPrimitiveTypes);

42 return false;

43 }

45 if(vbo[MESH_ATTR_VERTEX]) {

46 destroy();

47 }

49 name = aim->mName.data;

51 nverts = aim->mNumVertices;

52 nfaces = aim->mNumFaces;

54 glGenBuffers(1, vbo + MESH_ATTR_VERTEX);

55 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);

56 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mVertices, aim->mVertices, GL_STATIC_DRAW);

58 if(aim->mNormals) {

59 glGenBuffers(1, vbo + MESH_ATTR_NORMAL);

60 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);

61 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mNormals, aim->mNormals, GL_STATIC_DRAW);

62 }

63 if(aim->mTangents) {

64 glGenBuffers(1, vbo + MESH_ATTR_TANGENT);

65 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);

66 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTangents, aim->mTangents, GL_STATIC_DRAW);

67 }

68 if(aim->mTextureCoords[0]) {

69 glGenBuffers(1, vbo + MESH_ATTR_TEXCOORD);

70 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);

71 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTextureCoords[0], aim->mTextureCoords[0], GL_STATIC_DRAW);

72 }

74 glGenBuffers(1, &ibo);

75 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);

76 glBufferData(GL_ELEMENT_ARRAY_BUFFER, nfaces * 3 * sizeof(unsigned int), 0, GL_STATIC_DRAW);

78 /* map the buffer and fill it up */

79 unsigned int *iptr = (unsigned int*)glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);

81 for(int i=0; i<(int)nfaces; i++) {

82 for(int j=0; j<3; j++) {

83 *iptr++ = aim->mFaces[i].mIndices[j];

84 }

85 }

86 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);

87 glBindBuffer(GL_ARRAY_BUFFER, 0);

88 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

89 return true;

90 }

92 void Mesh::destroy()

93 {

94 for(int i=0; i<NUM_MESH_ATTR; i++) {

95 if(vbo[i]) {

96 glDeleteBuffers(1, vbo + i);

97 vbo[i] = 0;

98 }

99 }

100 glDeleteBuffers(1, &ibo);

101 ibo = 0;

102

103 nverts = nfaces = 0;

104 tang_loc = -1;

105 }

106

107 void Mesh::set_xform(const Matrix4x4 &mat)

108 {

109 xform = mat;

110 bsph_valid = false;

111 }

112

113 const Matrix4x4 &Mesh::get_xform() const

114 {

115 return xform;

116 }

117

118 void Mesh::set_material(const Material &mat)

119 {

120 this->mat = mat;

121 }

122

123 const Material &Mesh::get_material() const

124 {

125 return mat;

126 }

127

128 void Mesh::set_attrib_location(int attr, int loc)

129 {

130 if(attr == MESH_ATTR_TANGENT) {

131 tang_loc = loc;

132 }

133 }

134

135 int Mesh::get_attrib_location(int attr) const

136 {

137 return tang_loc;

138 }

139

140 void Mesh::draw() const

141 {

142 mat.setup();

143

144 glMatrixMode(GL_MODELVIEW);

145 glPushMatrix();

146 mult_matrix(xform);

147

148 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);

149 glVertexPointer(3, GL_FLOAT, 0, 0);

150 glEnableClientState(GL_VERTEX_ARRAY);

151

152 if(vbo[MESH_ATTR_NORMAL]) {

153 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);

154 glNormalPointer(GL_FLOAT, 0, 0);

155 glEnableClientState(GL_NORMAL_ARRAY);

156 }

157 if(vbo[MESH_ATTR_TANGENT] && tang_loc >= 0) {

158 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);

159 glVertexAttribPointer(tang_loc, 3, GL_FLOAT, GL_FALSE, 0, 0);

160 glEnableVertexAttribArray(tang_loc);

161 }

162 if(vbo[MESH_ATTR_TEXCOORD]) {

163 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);

164 glTexCoordPointer(3, GL_FLOAT, 0, 0);

165 glEnableClientState(GL_TEXTURE_COORD_ARRAY);

166 }

167

168 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);

169 glDrawElements(GL_TRIANGLES, nfaces * 3, GL_UNSIGNED_INT, 0);

170

171 glDisableClientState(GL_VERTEX_ARRAY);

172 glDisableClientState(GL_NORMAL_ARRAY);

173 glDisableClientState(GL_TEXTURE_COORD_ARRAY);

174 if(tang_loc >= 0) {

175 glDisableVertexAttribArray(tang_loc);

176 }

177

178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

179

180 #ifdef DBG_NORMALS

181 glPushAttrib(GL_ENABLE_BIT);

182 glDisable(GL_LIGHTING);

183

184 int prog;

185 glGetIntegerv(GL_CURRENT_PROGRAM, &prog);

186 glUseProgram(0);

187

188 Vector3 *varr, *narr, *tarr;

189

190 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);

191 varr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);

192

193 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);

194 narr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);

195

196 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);

197 tarr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);

198

199 glBegin(GL_LINES);

200 for(unsigned int i=0; i<nverts; i++) {

201 glColor3f(0, 1, 0);

202 glVertex3f(varr->x, varr->y, varr->z);

203 glVertex3f(varr->x + narr->x * NSZ, varr->y + narr->y * NSZ, varr->z + narr->z * NSZ);

204

205 glColor3f(1, 1, 0);

206 glVertex3f(varr->x, varr->y, varr->z);

207 glVertex3f(varr->x + tarr->x * NSZ, varr->y + tarr->y * NSZ, varr->z + tarr->z * NSZ);

208 varr++;

209 narr++;

210 tarr++;

211 }

212 glEnd();

213

214 glUnmapBuffer(GL_ARRAY_BUFFER);

215 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);

216 glUnmapBuffer(GL_ARRAY_BUFFER);

217 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);

218 glUnmapBuffer(GL_ARRAY_BUFFER);

219

220 glUseProgram(prog);

221 glPopAttrib();

222 #endif

223

224 glBindBuffer(GL_ARRAY_BUFFER, 0);

225

226 glPopMatrix();

227 }

228

229

230 void Mesh::calc_bsph()

231 {

232 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);

233 Vector3 *varr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);

234

235 bsph_center = Vector3(0, 0, 0);

236

237 for(unsigned int i=0; i<nverts; i++) {

238 bsph_center += varr[i].transformed(xform);

239 }

240 bsph_center /= (float)nverts;

241

242 // XXX assume all vertices are equidistant from the center

243 bsph_rad = (varr[0].transformed(xform) - bsph_center).length();

244

245 glUnmapBuffer(GL_ARRAY_BUFFER);

246 bsph_valid = true;

247

248 printf("calculated center: %f %f %f, rad: %f\n", bsph_center.x, bsph_center.y, bsph_center.z, bsph_rad);

249 }

250

251 const Vector3 &Mesh::get_bsph_center() const

252 {

253 if(!bsph_valid) {

254 ((Mesh*)this)->calc_bsph();

255 }

256 return bsph_center;

257 }

258

259 float Mesh::get_bsph_radius() const

260 {

261 if(!bsph_valid) {

262 ((Mesh*)this)->calc_bsph();

263 }

264 return bsph_rad;

265 }