goat3dgfx: 25b911c7c35c src/shader.cc

goat3dgfx

view src/shader.cc @ 9:25b911c7c35c

fixed some line endings fixed the cubemap2.jpg file in examples/cubemap/data which was resized improperly causing seams...

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 18 Nov 2013 04:10:19 +0200
parents	1873dfd13f2d
children	7d6b667821cf

line source

1 #include <stdio.h>

2 #include <string.h>

3 #include <stdarg.h>

4 #include <errno.h>

5 #include "opengl.h"

6 #include "shader.h"

7 #include "logger.h"

8 #include "unistate.h"

9 #include "mesh.h"

11 #ifdef _MSC_VER

12 #include <malloc.h>

13 #else

14 #include <alloca.h>

15 #endif

17 #ifdef __GLEW_H__

18 #define HAVE_GEOMETRY_SHADER

19 #define HAVE_TESSELATION_SHADER

20 #endif

22 static void bind_standard_attr(const ShaderProg *prog);

23 static const char *strtype(unsigned int type);

25 ShaderProg *ShaderProg::current;

27 Shader::Shader()

28 {

29 sdr = type = 0;

30 name = 0;

31 }

33 Shader::~Shader()

34 {

35 destroy();

36 }

38 unsigned int Shader::get_id() const

39 {

40 return sdr;

41 }

43 void Shader::set_name(const char *name)

44 {

45 delete [] this->name;

46 this->name = new char[strlen(name) + 1];

47 strcpy(this->name, name);

48 }

50 const char *Shader::get_name() const

51 {

52 return name;

53 }

55 bool Shader::create(const char *src, unsigned int type)

56 {

57 #if !GL_ES_VERSION_2_0

58 const char *src_arr[] = {src};

59 #else

60 const char *src_arr[] = { "precision mediump float; ", src };

61 #endif

63 if(!sdr) {

64 sdr = glCreateShader(type);

65 }

67 info_log("compiling shader: %s... ", name ? name : "");

69 glShaderSource(sdr, sizeof src_arr / sizeof *src_arr, src_arr, 0);

70 glCompileShader(sdr);

72 int status;

73 glGetShaderiv(sdr, GL_COMPILE_STATUS, &status);

75 info_log(status ? "success\n" : "failed\n");

77 int info_len;

78 glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);

79 if(info_len > 1) {

80 char *buf = (char*)alloca(info_len);

81 glGetShaderInfoLog(sdr, info_len, 0, buf);

82 buf[info_len - 1] = 0;

84 if(status) {

85 info_log("%s\n", buf);

86 } else {

87 error_log("%s\n", buf);

88 }

89 }

91 return status == GL_TRUE;

92 }

94 void Shader::destroy()

95 {

96 if(sdr) {

97 glDeleteShader(sdr);

98 }

99 sdr = type = 0;

100

101 delete [] name;

102 name = 0;

103 }

104

105 bool Shader::load(const char *fname, unsigned int type)

106 {

107 FILE *fp;

108

109 if(!(fp = fopen(fname, "rb"))) {

110 error_log("failed to load %s shader: %s: %s\n", strtype(type), fname, strerror(errno));

111 return false;

112 }

113

114 fseek(fp, 0, SEEK_END);

115 long sz = ftell(fp);

116 rewind(fp);

117

118 char *src = (char*)alloca(sz + 1);

119 if(fread(src, 1, sz, fp) < (size_t)sz) {

120 error_log("failed to load %s shader: %s: %s\n", strtype(type), fname, strerror(errno));

121 fclose(fp);

122 return false;

123 }

124 src[sz] = 0;

125 fclose(fp);

126

127 set_name(fname);

128 return create(src, type);

129 }

130

131 // ---- shader program ----

132 ShaderProg::ShaderProg()

133 {

134 prog = 0;

135 must_link = true;

136 }

137

138 ShaderProg::~ShaderProg()

139 {

140 destroy();

141 }

142

143 unsigned int ShaderProg::get_id() const

144 {

145 return prog;

146 }

147

148 bool ShaderProg::create(const char *src, unsigned int type, ...)

149 {

150 va_list ap;

151

152 va_start(ap, type);

153 bool res = create(src, type, ap);

154 va_end(ap);

155

156 return res;

157 }

158

159 bool ShaderProg::create(const char *src, unsigned int type, va_list ap)

160 {

161 destroy();

162 prog = glCreateProgram();

163

164 while(src) {

165 Shader *sdr = new Shader;

166 if(!sdr->create(src, type)) {

167 va_end(ap);

168 return false;

169 }

170 add_shader(sdr);

171 src = va_arg(ap, const char*);

172 type = va_arg(ap, unsigned int);

173 }

174 return link();

175 }

176

177 bool ShaderProg::create(const char *vsrc, const char *psrc)

178 {

179 return create(VSDR(vsrc), PSDR(psrc), 0);

180 }

181

182 bool ShaderProg::create(Shader *sdr, ...)

183 {

184 va_list ap;

185

186 va_start(ap, sdr);

187 bool res = create(sdr, ap);

188 va_end(ap);

189

190 return res;

191 }

192

193 bool ShaderProg::create(Shader *sdr, va_list ap)

194 {

195 destroy();

196 prog = glCreateProgram();

197

198 while(sdr) {

199 add_shader(sdr);

200 sdr = va_arg(ap, Shader*);

201 }

202 return link();

203 }

204

205 bool ShaderProg::create(Shader *vsdr, Shader *psdr)

206 {

207 return create(vsdr, psdr, 0);

208 }

209

210 void ShaderProg::destroy()

211 {

212 if(prog) {

213 glDeleteProgram(prog);

214 }

215 prog = 0;

216

217 shaders.clear();

218 // don't actually destroy the shaders, let the ShaderSet own them

219 }

220

221 bool ShaderProg::load(const char *fname, unsigned int type, ...)

222 {

223 va_list ap;

224 va_start(ap, type);

225 bool res = load(fname, type, ap);

226 va_end(ap);

227

228 return res;

229 }

230

231 bool ShaderProg::load(const char *fname, unsigned int type, va_list ap)

232 {

233 destroy();

234 prog = glCreateProgram();

235

236 while(fname) {

237 Shader *sdr = new Shader;

238 if(!sdr->load(fname, type)) {

239 delete sdr;

240 return false;

241 }

242 add_shader(sdr);

243

244 if((fname = va_arg(ap, const char*))) {

245 type = va_arg(ap, unsigned int);

246 }

247 }

248

249 return link();

250 }

251

252 bool ShaderProg::load(const char *vfname, const char *pfname)

253 {

254 return load(VSDR(vfname), PSDR(pfname), 0);

255 }

256

257 void ShaderProg::add_shader(Shader *sdr)

258 {

259 glAttachShader(prog, sdr->get_id());

260 }

261

262 bool ShaderProg::link() const

263 {

264 bind_standard_attr(this);

265

266 CHECKGLERR;

267 info_log("linking program ... ");

268 glLinkProgram(prog);

269

270 int status;

271 glGetProgramiv(prog, GL_LINK_STATUS, &status);

272

273 info_log(status ? "success\n" : "failed\n");

274

275 int info_len;

276 glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);

277 if(info_len > 1) {

278 char *buf = (char*)alloca(info_len);

279 glGetProgramInfoLog(prog, info_len, 0, buf);

280 buf[info_len - 1] = 0;

281

282 if(status) {

283 info_log("%s\n", buf);

284 } else {

285 error_log("%s\n", buf);

286 }

287 }

288

289 if(status) {

290 must_link = false;

291 cache_state_uniforms();

292

293 return true;

294 }

295 return false;

296 }

297

298 void ShaderProg::bind() const

299 {

300 CHECKGLERR;

301 if(must_link) {

302 if(!link()) {

303 return;

304 }

305 }

306 CHECKGLERR;

307 glUseProgram(prog);

308 ShaderProg::current = (ShaderProg*)this;

309

310 setup_state_uniforms();

311 }

312

313

314 int ShaderProg::get_attrib_location(const char *name) const

315 {

316 glUseProgram(prog);

317 return glGetAttribLocation(prog, name);

318 }

319

320 void ShaderProg::set_attrib_location(const char *name, int loc) const

321 {

322 glBindAttribLocation(prog, loc, name);

323 must_link = true;

324 }

325

326 int ShaderProg::get_uniform_location(const char *name) const

327 {

328 glUseProgram(prog);

329 return glGetUniformLocation(prog, name);

330 }

331

332 bool ShaderProg::set_uniform(int loc, int val) const

333 {

334 glUseProgram(prog);

335 if(loc >= 0) {

336 glUniform1i(loc, val);

337 return true;

338 }

339 return false;

340 }

341

342 bool ShaderProg::set_uniform(int loc, float val) const

343 {

344 glUseProgram(prog);

345 if(loc >= 0) {

346 glUniform1f(loc, val);

347 return true;

348 }

349 return false;

350 }

351

352 bool ShaderProg::set_uniform(int loc, const Vector2 &v) const

353 {

354 glUseProgram(prog);

355 if(loc >= 0) {

356 glUniform2f(loc, v.x, v.y);

357 return true;

358 }

359 return false;

360 }

361

362 bool ShaderProg::set_uniform(int loc, const Vector3 &v) const

363 {

364 glUseProgram(prog);

365 if(loc >= 0) {

366 glUniform3f(loc, v.x, v.y, v.z);

367 return true;

368 }

369 return false;

370 }

371

372 bool ShaderProg::set_uniform(int loc, const Vector4 &v) const

373 {

374 glUseProgram(prog);

375 if(loc >= 0) {

376 glUniform4f(loc, v.x, v.y, v.z, v.w);

377 return true;

378 }

379 return false;

380 }

381

382 bool ShaderProg::set_uniform(int loc, const Matrix3x3 &m) const

383 {

384 glUseProgram(prog);

385 if(loc >= 0) {

386 glUniformMatrix3fv(loc, 1, GL_TRUE, m[0]);

387 return true;

388 }

389 return false;

390 }

391

392 bool ShaderProg::set_uniform(int loc, const Matrix4x4 &m) const

393 {

394 glUseProgram(prog);

395 if(loc >= 0) {

396 glUniformMatrix4fv(loc, 1, GL_TRUE, m[0]);

397 return true;

398 }

399 return false;

400 }

401

402

403 bool ShaderProg::set_uniform(const char *name, int val) const

404 {

405 return set_uniform(get_uniform_location(name), val);

406 }

407

408 bool ShaderProg::set_uniform(const char *name, float val) const

409 {

410 return set_uniform(get_uniform_location(name), val);

411 }

412

413 bool ShaderProg::set_uniform(const char *name, const Vector2 &v) const

414 {

415 return set_uniform(get_uniform_location(name), v);

416 }

417

418 bool ShaderProg::set_uniform(const char *name, const Vector3 &v) const

419 {

420 return set_uniform(get_uniform_location(name), v);

421 }

422

423 bool ShaderProg::set_uniform(const char *name, const Vector4 &v) const

424 {

425 return set_uniform(get_uniform_location(name), v);

426 }

427

428 bool ShaderProg::set_uniform(const char *name, const Matrix3x3 &m) const

429 {

430 return set_uniform(get_uniform_location(name), m);

431 }

432

433 bool ShaderProg::set_uniform(const char *name, const Matrix4x4 &m) const

434 {

435 return set_uniform(get_uniform_location(name), m);

436 }

437

438 static StType unist_type(GLenum type)

439 {

440 switch(type) {

441 case GL_FLOAT:

442 return ST_FLOAT;

443 case GL_FLOAT_VEC2:

444 return ST_FLOAT2;

445 case GL_FLOAT_VEC3:

446 return ST_FLOAT3;

447 case GL_FLOAT_VEC4:

448 return ST_FLOAT4;

449 case GL_INT:

450 case GL_SAMPLER_2D:

451 case GL_SAMPLER_CUBE:

452 #if !GL_ES_VERSION_2_0

453 case GL_SAMPLER_1D:

454 case GL_SAMPLER_3D:

455 case GL_SAMPLER_1D_SHADOW:

456 case GL_SAMPLER_2D_SHADOW:

457 #endif

458 return ST_INT;

459 case GL_INT_VEC2:

460 return ST_INT2;

461 case GL_INT_VEC3:

462 return ST_INT3;

463 case GL_INT_VEC4:

464 return ST_INT4;

465 case GL_FLOAT_MAT3:

466 return ST_MATRIX3;

467 case GL_FLOAT_MAT4:

468 return ST_MATRIX4;

469 default:

470 break;

471 }

472 return ST_UNKNOWN;

473 }

474

475 void ShaderProg::cache_state_uniforms() const

476 {

477 if(!glIsProgram(prog)) {

478 return;

479 }

480

481 int num_uni;

482 glGetProgramiv(prog, GL_ACTIVE_UNIFORMS, &num_uni);

483

484 char name[256];

485 for(int i=0; i<num_uni; i++) {

486 GLint sz;

487 GLenum type;

488 glGetActiveUniform(prog, i, sizeof name - 1, 0, &sz, &type, name);

489

490 if(strstr(name, "st_") == name) {

491 StateLocCache s;

492 s.sidx = add_unistate(name, unist_type(type));

493 s.loc = glGetUniformLocation(prog, name);

494 stloc_cache.push_back(s);

495 }

496 }

497 }

498

499 void ShaderProg::setup_state_uniforms() const

500 {

501 for(size_t i=0; i<stloc_cache.size(); i++) {

502 setup_unistate(stloc_cache[i].sidx, this, stloc_cache[i].loc);

503 CHECKGLERR;

504 }

505 }

506

507 // ---- ShaderSet ----

508 static Shader *load_shader(const char *fname, unsigned int type)

509 {

510 Shader *sdr = new Shader;

511 if(!sdr->load(fname, type)) {

512 delete sdr;

513 return 0;

514 }

515 return sdr;

516 }

517

518 static Shader *load_vertex_shader(const char *fname)

519 {

520 return load_shader(fname, GL_VERTEX_SHADER);

521 }

522

523 static Shader *load_pixel_shader(const char *fname)

524 {

525 return load_shader(fname, GL_FRAGMENT_SHADER);

526 }

527

528 #ifdef HAVE_GEOMETRY_SHADER

529 static Shader *load_geom_shader(const char *fname)

530 {

531 return load_shader(fname, GL_GEOMETRY_SHADER);

532 }

533 #endif

534

535 #ifdef HAVE_TESSELATION_SHADER

536 static Shader *load_tc_shader(const char *fname)

537 {

538 return load_shader(fname, GL_TESS_CONTROL_SHADER);

539 }

540

541 static Shader *load_te_shader(const char *fname)

542 {

543 return load_shader(fname, GL_TESS_EVALUATION_SHADER);

544 }

545 #endif

546

547 static void destroy_shader(Shader *sdr)

548 {

549 delete sdr;

550 }

551

552 ShaderSet::ShaderSet(unsigned int type)

553 : DataSet<Shader*>(0, destroy_shader)

554 {

555 this->type = type;

556

557 switch(type) {

558 case GL_VERTEX_SHADER:

559 load = load_vertex_shader;

560 break;

561

562 case GL_FRAGMENT_SHADER:

563 load = load_pixel_shader;

564 break;

565

566 #ifdef HAVE_GEOMETRY_SHADER

567 case GL_GEOMETRY_SHADER:

568 load = load_geom_shader;

569 break;

570 #endif

571

572 #ifdef HAVE_TESSELATION_SHADER

573 case GL_TESS_CONTROL_SHADER:

574 load = load_tc_shader;

575 break;

576

577 case GL_TESS_EVALUATION_SHADER:

578 load = load_te_shader;

579 break;

580 #endif

581

582 default:

583 error_log("ShaderSet constructed with invalid shader type!\n");

584 }

585 }

586

587 static struct { const char *name; int loc; } attr_loc[] = {

588 {"attr_vertex", MESH_ATTR_VERTEX},

589 {"attr_normal", MESH_ATTR_NORMAL},

590 {"attr_tangent", MESH_ATTR_TANGENT},

591 {"attr_texcoord", MESH_ATTR_TEXCOORD},

592 {"attr_color", MESH_ATTR_COLOR},

593 {"attr_boneweights", MESH_ATTR_BONEWEIGHTS},

594 {"attr_boneidx", MESH_ATTR_BONEIDX}

595 };

596

597 static void bind_standard_attr(const ShaderProg *prog)

598 {

599 // we must link once to find out which are the active attributes

600 glLinkProgram(prog->get_id());

601

602 int num_attr;

603 glGetProgramiv(prog->get_id(), GL_ACTIVE_ATTRIBUTES, &num_attr);

604

605 char name[256];

606 for(int i=0; i<num_attr; i++) {

607 GLint sz;

608 GLenum type;

609 glGetActiveAttrib(prog->get_id(), i, sizeof name - 1, 0, &sz, &type, name);

610

611 for(int j=0; j<(int)(sizeof attr_loc / sizeof *attr_loc); j++) {

612 if(strcmp(name, attr_loc[j].name) == 0) {

613 prog->set_attrib_location(name, attr_loc[j].loc);

614 }

615 }

616 }

617 }

618

619

620 static const char *strtype(unsigned int type)

621 {

622 switch(type) {

623 case GL_VERTEX_SHADER:

624 return "vertex";

625 case GL_FRAGMENT_SHADER:

626 return "fragment";

627 #ifdef HAVE_GEOMETRY_SHADER

628 case GL_GEOMETRY_SHADER:

629 return "geometry";

630 #endif

631 #ifdef HAVE_TESSELATION_SHADER

632 case GL_TESS_CONTROL_SHADER:

633 return "tesselation control";

634 case GL_TESS_EVALUATION_SHADER:

635 return "tesselation evaluation";

636 #endif

637 default:

638 break;

639 }

640 return "<unknown>";

641 }