view3d: 1a3799ff443a src/scene.c

view3d

view src/scene.c @ 11:1a3799ff443a

merged fullscreen and minor edit

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 04 Sep 2012 05:11:13 +0300
parents	5562a637e5aa
children

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <float.h>

5 #include <GL/glew.h>

7 #include <assimp/assimp.h>

8 #include <assimp/aiScene.h>

9 #include <assimp/aiPostProcess.h>

11 #include <imago2.h>

13 #include "scene.h"

15 static void setup_light(struct light *lt);

16 static void color(float *dest, float r, float g, float b);

17 static struct mesh *create_mesh(const struct aiScene *aiscn, struct aiMesh *aim);

18 static unsigned int create_buffer(unsigned int type, void *data, size_t sz);

19 static unsigned int load_texture(const char *fname);

21 extern int verbose;

23 int init_scene(struct scene *scn)

24 {

25 scn->meshes = 0;

26 scn->lights = 0;

28 scn->bbox.min[0] = scn->bbox.min[1] = scn->bbox.min[2] = FLT_MAX;

29 scn->bbox.max[0] = scn->bbox.max[1] = scn->bbox.max[2] = -FLT_MAX;

30 return 0;

31 }

33 int load_scene(struct scene *scn, const char *fname)

34 {

35 int i, j;

36 const struct aiScene *aiscn;

37 unsigned int proc_flags = aiProcess_JoinIdenticalVertices |

38 aiProcess_PreTransformVertices | aiProcess_Triangulate |

39 aiProcess_GenSmoothNormals | aiProcess_SortByPType | aiProcess_FlipUVs;

41 if(!(aiscn = aiImportFile(fname, proc_flags))) {

42 fprintf(stderr, "failed to load: %s\n", fname);

43 return -1;

44 }

46 if(verbose) {

47 printf("scene: %s (%d meshes, %d lights)\n", fname, aiscn->mNumMeshes, aiscn->mNumLights);

48 }

50 for(i=0; i<aiscn->mNumLights; i++) {

51 struct light *lt;

52 struct aiLight *ailt = aiscn->mLights[i];

54 if(!(lt = malloc(sizeof *lt))) {

55 perror("failed to allocate light");

56 return -1;

57 }

59 if(verbose) {

60 printf("- light(%s) ", ailt->mName.data);

61 }

63 switch(ailt->mType) {

64 case aiLightSource_POINT:

65 lt->pos[0] = ailt->mPosition.x;

66 lt->pos[1] = ailt->mPosition.y;

67 lt->pos[2] = ailt->mPosition.z;

68 lt->pos[3] = 1.0f;

69 if(verbose) {

70 printf("pos(%.2f %.2f %.2f) ", lt->pos[0], lt->pos[1], lt->pos[2]);

71 }

72 break;

74 case aiLightSource_DIRECTIONAL:

75 lt->pos[0] = ailt->mDirection.x;

76 lt->pos[1] = ailt->mDirection.y;

77 lt->pos[2] = ailt->mDirection.z;

78 lt->pos[3] = 0.0f;

79 if(verbose) {

80 printf("dir(%.2f %.2f %.2f) ", lt->pos[0], lt->pos[1], lt->pos[2]);

81 }

82 break;

84 default:

85 fprintf(stderr, "error loading light: %s, unsupported type\n", ailt->mName.data);

86 continue;

87 }

88 color(lt->color, ailt->mColorDiffuse.r, ailt->mColorDiffuse.g, ailt->mColorDiffuse.b);

89 if(verbose) {

90 printf("col(%.2f %.2f %.2f) ", lt->color[0], lt->color[1], lt->color[2]);

91 }

93 lt->cone_inner = ailt->mAngleInnerCone;

94 lt->cone_outer = ailt->mAngleOuterCone;

96 lt->att[0] = ailt->mAttenuationConstant;

97 lt->att[1] = ailt->mAttenuationLinear;

98 lt->att[2] = ailt->mAttenuationQuadratic;

99 if(verbose) {

100 printf("att(%.2f %.2f %.2f)\n", lt->att[0], lt->att[1], lt->att[2]);

101 }

102

103 lt->next = scn->lights;

104 scn->lights = lt;

105 }

106

107 /* load meshes and calculate bounding box */

108 for(i=0; i<aiscn->mNumMeshes; i++) {

109 struct mesh *m;

110

111 if(!(m = create_mesh(aiscn, aiscn->mMeshes[i]))) {

112 return -1;

113 }

114

115 for(j=0; j<3; j++) {

116 if(m->bbox.min[j] < scn->bbox.min[j]) {

117 scn->bbox.min[j] = m->bbox.min[j];

118 }

119 if(m->bbox.max[j] > scn->bbox.max[j]) {

120 scn->bbox.max[j] = m->bbox.max[j];

121 }

122 }

123

124 m->next = scn->meshes;

125 scn->meshes = m;

126 }

127

128 aiReleaseImport(aiscn);

129 return 0;

130 }

131

132 static void color(float *dest, float r, float g, float b)

133 {

134 dest[0] = r;

135 dest[1] = g;

136 dest[2] = b;

137 dest[3] = 1.0;

138 }

139

140 static struct mesh *create_mesh(const struct aiScene *aiscn, struct aiMesh *aim)

141 {

142 int i, j;

143 struct mesh *m;

144 struct aiMaterial *mat = aiscn->mMaterials[aim->mMaterialIndex];

145 float sstr = 1.0;

146 unsigned int sz, *idxarr, *dptr;

147 struct aiVector3D *vptr;

148 struct aiString tex_name;

149

150 if(!(m = calloc(1, sizeof *m))) {

151 perror("failed to allocate mesh");

152 return 0;

153 }

154

155 if(verbose) {

156 printf("- mesh(%s) v:%d f:%d\n", aim->mName.data, aim->mNumVertices, aim->mNumFaces);

157 }

158

159 /* default material */

160 color(m->mat.kd, 1, 1, 1);

161 color(m->mat.ks, 0, 0, 0);

162 m->mat.shin = 60.0;

163

164 aiGetMaterialColor(mat, AI_MATKEY_COLOR_DIFFUSE, (void*)m->mat.kd);

165 aiGetMaterialColor(mat, AI_MATKEY_COLOR_SPECULAR, (void*)m->mat.ks);

166 sz = 1;

167 aiGetMaterialFloatArray(mat, AI_MATKEY_SHININESS, &m->mat.shin, &sz);

168 sz = 1;

169 aiGetMaterialFloatArray(mat, AI_MATKEY_SHININESS_STRENGTH, &sstr, &sz);

170 color(m->mat.ks, m->mat.ks[0] * sstr, m->mat.ks[1] * sstr, m->mat.ks[2] * sstr);

171

172 if(aiGetMaterialString(mat, AI_MATKEY_TEXTURE(aiTextureType_DIFFUSE, 0), &tex_name) == 0) {

173 m->mat.tex = load_texture(tex_name.data);

174 }

175

176 m->num_verts = aim->mNumVertices;

177 m->num_faces = aim->mNumFaces;

178

179 m->bbox.min[0] = m->bbox.min[1] = m->bbox.min[2] = FLT_MAX;

180 m->bbox.max[0] = m->bbox.max[1] = m->bbox.max[2] = -FLT_MAX;

181

182 vptr = aim->mVertices;

183 for(i=0; i<m->num_verts; i++) {

184 if(vptr->x < m->bbox.min[0]) m->bbox.min[0] = vptr->x;

185 if(vptr->y < m->bbox.min[1]) m->bbox.min[1] = vptr->y;

186 if(vptr->z < m->bbox.min[2]) m->bbox.min[2] = vptr->z;

187 if(vptr->x > m->bbox.max[0]) m->bbox.max[0] = vptr->x;

188 if(vptr->y > m->bbox.max[1]) m->bbox.max[1] = vptr->y;

189 if(vptr->z > m->bbox.max[2]) m->bbox.max[2] = vptr->z;

190 vptr++;

191 }

192

193 m->vert_buf = create_buffer(GL_ARRAY_BUFFER, aim->mVertices, m->num_verts * sizeof *aim->mVertices);

194 if(aim->mNormals) {

195 m->norm_buf = create_buffer(GL_ARRAY_BUFFER, aim->mNormals, m->num_verts * sizeof *aim->mNormals);

196 }

197 if(aim->mTextureCoords) {

198 m->tex_buf = create_buffer(GL_ARRAY_BUFFER, aim->mTextureCoords[0], m->num_verts * sizeof *aim->mTextureCoords[0]);

199 }

200

201 /* indices are scattered all over the fucking place... map the buffer and collect them there directly */

202 m->idx_buf = create_buffer(GL_ELEMENT_ARRAY_BUFFER, 0, m->num_faces * 3 * sizeof *aim->mFaces[0].mIndices);

203 dptr = idxarr = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);

204

205 for(i=0; i<m->num_faces; i++) {

206 for(j=0; j<3; j++) {

207 *dptr++ = aim->mFaces[i].mIndices[j];

208 }

209 }

210 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);

211 return m;

212 }

213

214 static unsigned int create_buffer(unsigned int type, void *data, size_t sz)

215 {

216 unsigned int vbo;

217 glGenBuffers(1, &vbo);

218 glBindBuffer(type, vbo);

219 glBufferData(type, sz, data, GL_STATIC_DRAW);

220 return vbo;

221 }

222

223 static unsigned int load_texture(const char *fname)

224 {

225 unsigned int tex;

226 void *pixels;

227 int xsz, ysz;

228

229 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {

230 fprintf(stderr, "failed to load image: %s\n", fname);

231 return 0;

232 }

233

234 if(verbose) {

235 printf(" - texture: %s (%dx%d)\n", fname, xsz, ysz);

236 }

237

238 glGenTextures(1, &tex);

239 glBindTexture(GL_TEXTURE_2D, tex);

240 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

241 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

242 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

243 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

244 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

245

246 img_free_pixels(pixels);

247 return tex;

248 }

249

250 void render_scene(struct scene *scn)

251 {

252 struct light *lt = scn->lights;

253 int pass = 0;

254

255 glEnable(GL_BLEND);

256 glDepthFunc(GL_LEQUAL);

257

258 while(lt || pass == 0) {

259 struct mesh *m;

260

261 setup_light(lt);

262

263 if(pass == 0) {

264 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

265 } else {

266 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

267 glDepthMask(0);

268 }

269

270 m = scn->meshes;

271 while(m) {

272 render_mesh(m, pass);

273 m = m->next;

274 }

275 pass++;

276 if(lt) {

277 lt = lt->next;

278 }

279 }

280

281 glDisable(GL_BLEND);

282 glDepthMask(1);

283 }

284

285 static void setup_light(struct light *lt)

286 {

287 if(!lt)

288 return;

289 glLightfv(GL_LIGHT0, GL_POSITION, lt->pos);

290 glLightfv(GL_LIGHT0, GL_DIFFUSE, lt->color);

291 glLightfv(GL_LIGHT0, GL_SPECULAR, lt->color);

292 glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, lt->att[0]);

293 glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, lt->att[1]);

294 glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, lt->att[2]);

295 glEnable(GL_LIGHT0);

296 }

297

298 void render_mesh(struct mesh *m, int pass)

299 {

300 if(pass > 0) {

301 float black[] = {0, 0, 0, 0};

302 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, black);

303 } else {

304 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, m->mat.kd);

305 }

306 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, m->mat.kd);

307 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, m->mat.ks);

308 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, m->mat.shin);

309

310 if(m->mat.tex) {

311 glEnable(GL_TEXTURE_2D);

312 glBindTexture(GL_TEXTURE_2D, m->mat.tex);

313 }

314

315 glBindBuffer(GL_ARRAY_BUFFER, m->vert_buf);

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

317 glEnableClientState(GL_VERTEX_ARRAY);

318

319 if(m->norm_buf) {

320 glBindBuffer(GL_ARRAY_BUFFER, m->norm_buf);

321 glNormalPointer(GL_FLOAT, 0, 0);

322 glEnableClientState(GL_NORMAL_ARRAY);

323 }

324 if(m->tex_buf) {

325 glBindBuffer(GL_ARRAY_BUFFER, m->tex_buf);

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

327 glEnableClientState(GL_TEXTURE_COORD_ARRAY);

328 }

329

330 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m->idx_buf);

331 glDrawElements(GL_TRIANGLES, m->num_faces * 3, GL_UNSIGNED_INT, 0);

332

333 glDisableClientState(GL_VERTEX_ARRAY);

334 glDisableClientState(GL_NORMAL_ARRAY);

335 glDisableClientState(GL_TEXTURE_COORD_ARRAY);

336

337 if(m->mat.tex) {

338 glDisable(GL_TEXTURE_2D);

339 }

340 }