goat3dgfx: 7d6b667821cf src/texture.cc

goat3dgfx

view src/texture.cc @ 15:7d6b667821cf

wrapped everything in the goatgfx namespace

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 30 Nov 2013 20:52:21 +0200
parents	25b911c7c35c
children	dc5918c62a64

line source

1 #include <math.h>

2 #include "texture.h"

3 #include "image.h"

4 #include "opengl.h"

5 #include "imago2.h"

6 #include "logger.h"

7 #include "datapath.h"

9 using namespace goatgfx;

11 static int glifmt_from_ifmt(unsigned int ifmt);

12 static int glfmt_from_ifmt(unsigned int ifmt);

13 static int gltype_from_ifmt(unsigned int ifmt);

15 static int glifmt_from_imgfmt(Image::Format fmt);

17 static unsigned int cur_target[8] = {

18 GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D,

19 GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D

20 };

22 namespace goatgfx {

24 void set_texture(Texture *tex, int tunit)

25 {

26 if(tex) {

27 tex->bind(tunit);

28 } else {

29 glActiveTexture(GL_TEXTURE0 + tunit);

30 glBindTexture(cur_target[tunit], 0);

31 glActiveTexture(GL_TEXTURE0);

32 }

33 }

35 Texture *load_texture(const char *fname)

36 {

37 TextureCube *texcube = new TextureCube;

38 if(texcube->load(fname)) {

39 return texcube;

40 }

41 delete texcube;

43 Texture2D *tex = new Texture2D;

44 if(tex->load(fname)) {

45 return tex;

46 }

47 delete tex;

48 return 0;

49 }

51 } // namespace goatgfx

53 Texture::Texture()

54 {

55 target = 0;

56 sz[0] = sz[1] = sz[2] = 0;

57 texfmt = 0;

59 glGenTextures(1, &id);

60 }

62 Texture::~Texture()

63 {

64 if(id) {

65 glDeleteTextures(1, &id);

66 }

67 }

69 void Texture::set_wrapping(unsigned int wrap)

70 {

71 if(!target) {

72 return;

73 }

75 glBindTexture(target, id);

76 glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap);

77 glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap);

78 }

80 void Texture::set_filtering(unsigned int filt)

81 {

82 unsigned int mag_filter;

84 if(!target) {

85 return;

86 }

88 switch(filt) {

89 case GL_LINEAR_MIPMAP_NEAREST:

90 case GL_LINEAR_MIPMAP_LINEAR:

91 mag_filter = GL_LINEAR;

92 break;

94 case GL_NEAREST_MIPMAP_NEAREST:

95 case GL_NEAREST_MIPMAP_LINEAR:

96 mag_filter = GL_NEAREST;

97 break;

99 default:

100 mag_filter = filt;

101 }

102

103 set_filtering(filt, mag_filter);

104 }

105

106 void Texture::set_filtering(unsigned int min_filt, unsigned int mag_filt)

107 {

108 glBindTexture(target, id);

109 glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filt);

110 glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mag_filt);

111 }

112

113 unsigned int Texture::get_format() const

114 {

115 return texfmt;

116 }

117

118 int Texture::get_size(int dim) const

119 {

120 if(dim < 0 || dim >= 3) {

121 return 0;

122 }

123 return sz[dim];

124 }

125

126 unsigned int Texture::get_id() const

127 {

128 return id;

129 }

130

131 void Texture::bind(int tex_unit) const

132 {

133 glActiveTexture(GL_TEXTURE0 + tex_unit);

134 glBindTexture(target, id);

135 glActiveTexture(GL_TEXTURE0);

136

137 cur_target[tex_unit] = target;

138 }

139

140

141 // ---- Texture2D ----

142

143 Texture2D::Texture2D()

144 {

145 target = GL_TEXTURE_2D;

146 }

147

148 void Texture2D::create(int xsz, int ysz, unsigned int ifmt)

149 {

150 int fmt = glfmt_from_ifmt(ifmt);

151 int type = gltype_from_ifmt(ifmt);

152

153 glBindTexture(GL_TEXTURE_2D, id);

154 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

155 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

156 glTexImage2D(GL_TEXTURE_2D, 0, glifmt_from_ifmt(ifmt), xsz, ysz, 0, fmt, type, 0);

157 CHECKGLERR;

158 sz[0] = xsz;

159 sz[1] = ysz;

160 texfmt = ifmt;

161 }

162

163 void Texture2D::set_image(const Image &img, int idx)

164 {

165 texfmt = glifmt_from_imgfmt(img.get_format());

166 unsigned int fmt = glfmt_from_ifmt(texfmt);

167 unsigned int type = gltype_from_ifmt(texfmt);

168

169 sz[0] = img.get_width();

170 sz[1] = img.get_height();

171

172 glBindTexture(GL_TEXTURE_2D, id);

173 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

174 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

175 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

176 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

177

178 #ifdef __GLEW_H__

179 if(GLEW_SGIS_generate_mipmap) {

180 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);

181 #endif

182 glTexImage2D(GL_TEXTURE_2D, 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());

183 #ifdef __GLEW_H__

184 } else {

185 gluBuild2DMipmaps(GL_TEXTURE_2D, texfmt, sz[0], sz[1], fmt, type, img.get_pixels());

186 }

187 #endif

188

189 #ifdef GL_ES_VERSION_2_0

190 glGenerateMipmap(GL_TEXTURE_2D);

191 #endif

192 }

193

194 bool Texture2D::load(const char *fname)

195 {

196 Image img;

197 if(!img.load(fname)) {

198 error_log("failed to load 2D texture: %s\n", fname);

199 return false;

200 }

201 set_image(img);

202

203 info_log("loaded 2D texture: %s\n", fname);

204 return true;

205 }

206

207 bool Texture2D::save(const char *fname) const

208 {

209 #ifndef GL_ES_VERSION_2_0

210 unsigned char *pixels = new unsigned char[sz[0] * sz[1] * 4];

211

212 glBindTexture(GL_TEXTURE_2D, id);

213 glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

214

215 if(img_save_pixels(fname, pixels, sz[0], sz[1]) == -1) {

216 error_log("failed to save 2D texture: %s\n", fname);

217 delete [] pixels;

218 return false;

219 }

220

221 info_log("saved 2D texture: %s\n", fname);

222 delete [] pixels;

223 return true;

224 #else

225 return false; // TODO

226 #endif

227 }

228

229 // ---- TextureCube ----

230 static unsigned int cube_faces[] = {

231 GL_TEXTURE_CUBE_MAP_POSITIVE_X,

232 GL_TEXTURE_CUBE_MAP_NEGATIVE_X,

233 GL_TEXTURE_CUBE_MAP_POSITIVE_Y,

234 GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,

235 GL_TEXTURE_CUBE_MAP_POSITIVE_Z,

236 GL_TEXTURE_CUBE_MAP_NEGATIVE_Z

237 };

238

239 TextureCube::TextureCube()

240 {

241 target = GL_TEXTURE_CUBE_MAP;

242 }

243

244 void TextureCube::create(int xsz, int ysz, unsigned int ifmt)

245 {

246 if(xsz != ysz) {

247 error_log("trying to create cubemap with different width and height (%dx%d)\n", xsz, ysz);

248 return;

249 }

250

251 texfmt = ifmt;

252

253 glBindTexture(GL_TEXTURE_CUBE_MAP, id);

254 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

255 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

256 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

257 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

258 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

259

260 for(int i=0; i<6; i++) {

261 glTexImage2D(cube_faces[i], 0, ifmt, xsz, ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);

262 }

263 }

264

265 void TextureCube::set_image(const Image &img, int idx)

266 {

267 texfmt = glifmt_from_imgfmt(img.get_format());

268 unsigned int fmt = glfmt_from_ifmt(texfmt);

269 unsigned int type = gltype_from_ifmt(texfmt);

270

271 sz[0] = img.get_width();

272 sz[1] = img.get_height();

273

274 glBindTexture(GL_TEXTURE_CUBE_MAP, id);

275 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

276 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

277 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

278 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

279 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

280

281 glTexImage2D(cube_faces[idx], 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());

282 }

283

284 bool TextureCube::load(const char *fname)

285 {

286 static const float one_third = 1.0 / 3.0;

287 static const float two_thirds = 2.0 / 3.0;

288 static const float hcross[2][6] = {

289 {0.5, 0.0, 0.25, 0.25, 0.25, 0.75}, {one_third, one_third, 0.0, two_thirds, one_third, one_third} };

290 static const float vcross[2][6] = {

291 {two_thirds, 0.0, one_third, one_third, one_third, one_third}, {0.25, 0.25, 0.0, 0.5, 0.25, 0.75} };

292 static const float hsix[2][6] = {

293 {0.0, 0.0, one_third, one_third, two_thirds, two_thirds}, {0.0, 0.5, 0.0, 0.5, 0.0, 0.5} };

294

295 Image img;

296 if(!img.load(fname)) {

297 return false;

298 }

299

300 int xsz = img.get_width();

301 int ysz = img.get_height();

302

303 if(xsz / 4 == ysz / 3) {

304 // horizontal cross, assume the vertical bit is center-left

305 return load_multi(img, hcross[0], hcross[1], xsz / 4);

306 }

307 if(xsz / 3 == ysz / 4) {

308 // vertical cross, assume the horizontal bit is center-top (180-rotated image 5)

309 return load_multi(img, vcross[0], vcross[1], ysz / 4, (1 << 5));

310 }

311 if(xsz / 3 == ysz / 2) {

312 // horizontal sixpack

313 return load_multi(img, hsix[0], hsix[1], ysz / 2);

314 }

315

316 error_log("failed to load %s: unknown cubemap configuration\n", fname);

317 return false;

318 }

319

320 bool TextureCube::save(const char *fname) const

321 {

322 return false; // TODO

323 }

324

325 bool TextureCube::load_multi(const Image &img, const float *xoffsets, const float *yoffsets, float sz,

326 unsigned int rotmask)

327 {

328 for(int i=0; i<6; i++) {

329 Image face;

330

331 int xoffs = xoffsets[i] * img.get_width();

332 int yoffs = yoffsets[i] * img.get_height();

333

334 if(!face.set_pixels(sz, sz, img.get_pixels(), xoffs, yoffs, img.get_width(), img.get_format())) {

335 return false;

336 }

337

338 if(rotmask & (1 << i)) {

339 face.rotate_180();

340 }

341 set_image(face, i);

342 }

343 return true;

344 }

345

346 static int glifmt_from_ifmt(unsigned int ifmt)

347 {

348 #ifdef GL_ES_VERSION_2_0

349 switch(ifmt) {

350 case GL_LUMINANCE16F:

351 case GL_LUMINANCE32F:

352 ifmt = GL_LUMINANCE;

353 break;

354

355 case GL_RGB16F:

356 case GL_RGB32F:

357 ifmt = GL_RGB;

358 break;

359

360 case GL_RGBA16F:

361 case GL_RGBA32F:

362 ifmt = GL_RGBA;

363 break;

364

365 default:

366 break;

367 }

368 #endif

369 return ifmt; // by default just pass it through...

370 }

371

372 static int glfmt_from_ifmt(unsigned int ifmt)

373 {

374 switch(ifmt) {

375 case GL_LUMINANCE16F:

376 case GL_LUMINANCE32F:

377 return GL_LUMINANCE;

378

379 case GL_RGB16F:

380 case GL_RGB32F:

381 return GL_RGB;

382

383 case GL_RGBA16F:

384 case GL_RGBA32F:

385 return GL_RGBA;

386

387 default:

388 break;

389 }

390 return ifmt;

391 }

392

393 static int gltype_from_ifmt(unsigned int ifmt)

394 {

395 switch(ifmt) {

396 case GL_RGB16F:

397 case GL_RGBA16F:

398 case GL_LUMINANCE16F:

399 #ifdef GL_ES_VERSION_2_0

400 return GL_HALF_FLOAT_OES;

401 #endif

402 case GL_RGB32F:

403 case GL_RGBA32F:

404 case GL_LUMINANCE32F:

405 return GL_FLOAT;

406

407 default:

408 break;

409 }

410 return GL_UNSIGNED_BYTE;

411 }

412

413 static int glifmt_from_imgfmt(Image::Format fmt)

414 {

415 switch(fmt) {

416 case Image::FMT_GREY:

417 return GL_LUMINANCE;

418 case Image::FMT_GREY_FLOAT:

419 return GL_LUMINANCE16F;

420 case Image::FMT_RGB:

421 return GL_RGB;

422 case Image::FMT_RGB_FLOAT:

423 return GL_RGB16F;

424 case Image::FMT_RGBA:

425 return GL_RGBA;

426 case Image::FMT_RGBA_FLOAT:

427 return GL_RGBA16F;

428 default:

429 break;

430 }

431 return 0;

432 }

433

434 // ---- TextureSet ----

435 static void destroy_texture(Texture *tex)

436 {

437 delete tex;

438 }

439

440 TextureSet::TextureSet()

441 : DataSet<Texture*>(load_texture, destroy_texture)

442 {

443 }