tavli: b1a195c3ee16 src/sdr.c

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view src/sdr.c @ 15:b1a195c3ee16

added shaders

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 28 Jun 2015 08:34:24 +0300
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line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <string.h>

4 #include <errno.h>

5 #include <stdarg.h>

6 #include <assert.h>

7 #include "opengl.h"

9 #if defined(unix) || defined(__unix__)

10 #include <unistd.h>

11 #include <sys/stat.h>

12 #endif /* unix */

14 #include "sdr.h"

16 static const char *sdrtypestr(unsigned int sdrtype);

18 unsigned int create_vertex_shader(const char *src)

19 {

20 return create_shader(src, GL_VERTEX_SHADER);

21 }

23 unsigned int create_pixel_shader(const char *src)

24 {

25 return create_shader(src, GL_FRAGMENT_SHADER);

26 }

28 unsigned int create_tessctl_shader(const char *src)

29 {

30 #ifdef GL_TESS_CONTROL_SHADER

31 return create_shader(src, GL_TESS_CONTROL_SHADER);

32 #else

33 return 0;

34 #endif

35 }

37 unsigned int create_tesseval_shader(const char *src)

38 {

39 #ifdef GL_TESS_EVALUATION_SHADER

40 return create_shader(src, GL_TESS_EVALUATION_SHADER);

41 #else

42 return 0;

43 #endif

44 }

46 unsigned int create_geometry_shader(const char *src)

47 {

48 #ifdef GL_GEOMETRY_SHADER

49 return create_shader(src, GL_GEOMETRY_SHADER);

50 #else

51 return 0;

52 #endif

53 }

55 unsigned int create_shader(const char *src, unsigned int sdr_type)

56 {

57 unsigned int sdr;

58 int success, info_len;

59 char *info_str = 0;

60 GLenum err;

62 sdr = glCreateShader(sdr_type);

63 assert(glGetError() == GL_NO_ERROR);

64 glShaderSource(sdr, 1, &src, 0);

65 err = glGetError();

66 assert(err == GL_NO_ERROR);

67 glCompileShader(sdr);

68 assert(glGetError() == GL_NO_ERROR);

70 glGetShaderiv(sdr, GL_COMPILE_STATUS, &success);

71 assert(glGetError() == GL_NO_ERROR);

72 glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);

73 assert(glGetError() == GL_NO_ERROR);

75 if(info_len) {

76 if((info_str = malloc(info_len + 1))) {

77 glGetShaderInfoLog(sdr, info_len, 0, info_str);

78 assert(glGetError() == GL_NO_ERROR);

79 info_str[info_len] = 0;

80 }

81 }

83 if(success) {

84 fprintf(stderr, info_str ? "done: %s\n" : "done\n", info_str);

85 } else {

86 fprintf(stderr, info_str ? "failed: %s\n" : "failed\n", info_str);

87 glDeleteShader(sdr);

88 sdr = 0;

89 }

91 free(info_str);

92 return sdr;

93 }

95 void free_shader(unsigned int sdr)

96 {

97 glDeleteShader(sdr);

98 }

100 unsigned int load_vertex_shader(const char *fname)

101 {

102 return load_shader(fname, GL_VERTEX_SHADER);

103 }

104

105 unsigned int load_pixel_shader(const char *fname)

106 {

107 return load_shader(fname, GL_FRAGMENT_SHADER);

108 }

109

110 unsigned int load_tessctl_shader(const char *fname)

111 {

112 #ifdef GL_TESS_CONTROL_SHADER

113 return load_shader(fname, GL_TESS_CONTROL_SHADER);

114 #else

115 return 0;

116 #endif

117 }

118

119 unsigned int load_tesseval_shader(const char *fname)

120 {

121 #ifdef GL_TESS_EVALUATION_SHADER

122 return load_shader(fname, GL_TESS_EVALUATION_SHADER);

123 #else

124 return 0;

125 #endif

126 }

127

128 unsigned int load_geometry_shader(const char *fname)

129 {

130 #ifdef GL_GEOMETRY_SHADER

131 return load_shader(fname, GL_GEOMETRY_SHADER);

132 #else

133 return 0;

134 #endif

135 }

136

137 unsigned int load_shader(const char *fname, unsigned int sdr_type)

138 {

139 unsigned int sdr;

140 size_t filesize;

141 FILE *fp;

142 char *src;

143

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

145 fprintf(stderr, "failed to open shader %s: %s\n", fname, strerror(errno));

146 return 0;

147 }

148

149 fseek(fp, 0, SEEK_END);

150 filesize = ftell(fp);

151 fseek(fp, 0, SEEK_SET);

152

153 if(!(src = malloc(filesize + 1))) {

154 fclose(fp);

155 return 0;

156 }

157 fread(src, 1, filesize, fp);

158 src[filesize] = 0;

159 fclose(fp);

160

161 fprintf(stderr, "compiling %s shader: %s... ", sdrtypestr(sdr_type), fname);

162 sdr = create_shader(src, sdr_type);

163

164 free(src);

165 return sdr;

166 }

167

168

169 /* ---- gpu programs ---- */

170

171 unsigned int create_program(void)

172 {

173 unsigned int prog = glCreateProgram();

174 assert(glGetError() == GL_NO_ERROR);

175 return prog;

176 }

177

178 unsigned int create_program_link(unsigned int sdr0, ...)

179 {

180 unsigned int prog, sdr;

181 va_list ap;

182

183 if(!(prog = create_program())) {

184 return 0;

185 }

186

187 attach_shader(prog, sdr0);

188 if(glGetError()) {

189 return 0;

190 }

191

192 va_start(ap, sdr0);

193 while((sdr = va_arg(ap, unsigned int))) {

194 attach_shader(prog, sdr);

195 if(glGetError()) {

196 return 0;

197 }

198 }

199 va_end(ap);

200

201 if(link_program(prog) == -1) {

202 free_program(prog);

203 return 0;

204 }

205 return prog;

206 }

207

208 unsigned int create_program_load(const char *vfile, const char *pfile)

209 {

210 unsigned int vs = 0, ps = 0;

211

212 if(vfile && *vfile && !(vs = load_vertex_shader(vfile))) {

213 return 0;

214 }

215 if(pfile && *pfile && !(ps = load_pixel_shader(pfile))) {

216 return 0;

217 }

218 return create_program_link(vs, ps, 0);

219 }

220

221 void free_program(unsigned int sdr)

222 {

223 glDeleteProgram(sdr);

224 }

225

226 void attach_shader(unsigned int prog, unsigned int sdr)

227 {

228 int err;

229

230 if(prog && sdr) {

231 assert(glGetError() == GL_NO_ERROR);

232 glAttachShader(prog, sdr);

233 if((err = glGetError()) != GL_NO_ERROR) {

234 fprintf(stderr, "failed to attach shader %u to program %u (err: 0x%x)\n", sdr, prog, err);

235 abort();

236 }

237 }

238 }

239

240 int link_program(unsigned int prog)

241 {

242 int linked, info_len, retval = 0;

243 char *info_str = 0;

244

245 glLinkProgram(prog);

246 assert(glGetError() == GL_NO_ERROR);

247 glGetProgramiv(prog, GL_LINK_STATUS, &linked);

248 assert(glGetError() == GL_NO_ERROR);

249 glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);

250 assert(glGetError() == GL_NO_ERROR);

251

252 if(info_len) {

253 if((info_str = malloc(info_len + 1))) {

254 glGetProgramInfoLog(prog, info_len, 0, info_str);

255 assert(glGetError() == GL_NO_ERROR);

256 info_str[info_len] = 0;

257 }

258 }

259

260 if(linked) {

261 fprintf(stderr, info_str ? "linking done: %s\n" : "linking done\n", info_str);

262 } else {

263 fprintf(stderr, info_str ? "linking failed: %s\n" : "linking failed\n", info_str);

264 retval = -1;

265 }

266

267 free(info_str);

268 return retval;

269 }

270

271 int bind_program(unsigned int prog)

272 {

273 GLenum err;

274

275 glUseProgram(prog);

276 if(prog && (err = glGetError()) != GL_NO_ERROR) {

277 /* maybe the program is not linked, try linking first */

278 if(err == GL_INVALID_OPERATION) {

279 if(link_program(prog) == -1) {

280 return -1;

281 }

282 glUseProgram(prog);

283 return glGetError() == GL_NO_ERROR ? 0 : -1;

284 }

285 return -1;

286 }

287 return 0;

288 }

289

290 /* ugly but I'm not going to write the same bloody code over and over */

291 #define BEGIN_UNIFORM_CODE \

292 int loc, curr_prog; \

293 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog); \

294 if((unsigned int)curr_prog != prog && bind_program(prog) == -1) { \

295 return -1; \

296 } \

297 if((loc = glGetUniformLocation(prog, name)) != -1)

298

299 #define END_UNIFORM_CODE \

300 if((unsigned int)curr_prog != prog) { \

301 bind_program(curr_prog); \

302 } \

303 return loc == -1 ? -1 : 0

304

305 int set_uniform_int(unsigned int prog, const char *name, int val)

306 {

307 BEGIN_UNIFORM_CODE {

308 glUniform1i(loc, val);

309 }

310 END_UNIFORM_CODE;

311 }

312

313 int set_uniform_float(unsigned int prog, const char *name, float val)

314 {

315 BEGIN_UNIFORM_CODE {

316 glUniform1f(loc, val);

317 }

318 END_UNIFORM_CODE;

319 }

320

321 int set_uniform_float2(unsigned int prog, const char *name, float x, float y)

322 {

323 BEGIN_UNIFORM_CODE {

324 glUniform2f(loc, x, y);

325 }

326 END_UNIFORM_CODE;

327 }

328

329 int set_uniform_float3(unsigned int prog, const char *name, float x, float y, float z)

330 {

331 BEGIN_UNIFORM_CODE {

332 glUniform3f(loc, x, y, z);

333 }

334 END_UNIFORM_CODE;

335 }

336

337 int set_uniform_float4(unsigned int prog, const char *name, float x, float y, float z, float w)

338 {

339 BEGIN_UNIFORM_CODE {

340 glUniform4f(loc, x, y, z, w);

341 }

342 END_UNIFORM_CODE;

343 }

344

345 int set_uniform_matrix4(unsigned int prog, const char *name, float *mat)

346 {

347 BEGIN_UNIFORM_CODE {

348 glUniformMatrix4fv(loc, 1, GL_FALSE, mat);

349 }

350 END_UNIFORM_CODE;

351 }

352

353 int set_uniform_matrix4_transposed(unsigned int prog, const char *name, float *mat)

354 {

355 BEGIN_UNIFORM_CODE {

356 glUniformMatrix4fv(loc, 1, GL_TRUE, mat);

357 }

358 END_UNIFORM_CODE;

359 }

360

361 int get_attrib_loc(unsigned int prog, const char *name)

362 {

363 int loc, curr_prog;

364

365 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);

366 if((unsigned int)curr_prog != prog && bind_program(prog) == -1) {

367 return -1;

368 }

369

370 loc = glGetAttribLocation(prog, (char*)name);

371

372 if((unsigned int)curr_prog != prog) {

373 bind_program(curr_prog);

374 }

375 return loc;

376 }

377

378 void set_attrib_float3(int attr_loc, float x, float y, float z)

379 {

380 glVertexAttrib3f(attr_loc, x, y, z);

381 }

382

383 static const char *sdrtypestr(unsigned int sdrtype)

384 {

385 switch(sdrtype) {

386 case GL_VERTEX_SHADER:

387 return "vertex";

388 case GL_FRAGMENT_SHADER:

389 return "pixel";

390 #ifdef GL_TESS_CONTROL_SHADER

391 case GL_TESS_CONTROL_SHADER:

392 return "tessellation control";

393 #endif

394 #ifdef GL_TESS_EVALUATION_SHADER

395 case GL_TESS_EVALUATION_SHADER:

396 return "tessellation evaluation";

397 #endif

398 #ifdef GL_GEOMETRY_SHADER

399 case GL_GEOMETRY_SHADER:

400 return "geometry";

401 #endif

402

403 default:

404 break;

405 }

406 return "<unknown>";

407 }