gpuray_glsl: f234630e38ff src/glsdr.c

gpuray_glsl

view src/glsdr.c @ 0:f234630e38ff

initial commit

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 09 Nov 2014 13:03:36 +0200
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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 <GL/glew.h>

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

10 #include <unistd.h>

11 #include <sys/stat.h>

12 #endif /* unix */

14 #include "glsdr.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 return create_shader(src, GL_TESS_CONTROL_SHADER);

31 }

33 unsigned int create_tesseval_shader(const char *src)

34 {

35 return create_shader(src, GL_TESS_EVALUATION_SHADER);

36 }

38 unsigned int create_geometry_shader(const char *src)

39 {

40 return create_shader(src, GL_GEOMETRY_SHADER);

41 }

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

44 {

45 unsigned int sdr;

46 int success, info_len;

47 char *info_str = 0;

48 GLenum err;

50 sdr = glCreateShader(sdr_type);

51 assert(glGetError() == GL_NO_ERROR);

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

53 err = glGetError();

54 assert(err == GL_NO_ERROR);

55 glCompileShader(sdr);

56 assert(glGetError() == GL_NO_ERROR);

58 glGetShaderiv(sdr, GL_COMPILE_STATUS, &success);

59 assert(glGetError() == GL_NO_ERROR);

60 glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);

61 assert(glGetError() == GL_NO_ERROR);

63 if(info_len) {

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

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

66 assert(glGetError() == GL_NO_ERROR);

67 }

68 }

70 if(success) {

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

72 } else {

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

74 glDeleteShader(sdr);

75 sdr = 0;

76 }

78 free(info_str);

79 return sdr;

80 }

82 void free_shader(unsigned int sdr)

83 {

84 glDeleteShader(sdr);

85 }

87 unsigned int load_vertex_shader(const char *fname)

88 {

89 return load_shader(fname, GL_VERTEX_SHADER);

90 }

92 unsigned int load_pixel_shader(const char *fname)

93 {

94 return load_shader(fname, GL_FRAGMENT_SHADER);

95 }

97 unsigned int load_tessctl_shader(const char *fname)

98 {

99 return load_shader(fname, GL_TESS_CONTROL_SHADER);

100 }

101

102 unsigned int load_tesseval_shader(const char *fname)

103 {

104 return load_shader(fname, GL_TESS_EVALUATION_SHADER);

105 }

106

107 unsigned int load_geometry_shader(const char *fname)

108 {

109 return load_shader(fname, GL_GEOMETRY_SHADER);

110 }

111

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

113 {

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

115 struct stat st;

116 #endif

117 unsigned int sdr;

118 size_t filesize;

119 FILE *fp;

120 char *src;

121

122 if(!(fp = fopen(fname, "r"))) {

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

124 return 0;

125 }

126

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

128 fstat(fileno(fp), &st);

129 filesize = st.st_size;

130 #else

131 fseek(fp, 0, SEEK_END);

132 filesize = ftell(fp);

133 fseek(fp, 0, SEEK_SET);

134 #endif /* unix */

135

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

137 fclose(fp);

138 return 0;

139 }

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

141 src[filesize] = 0;

142 fclose(fp);

143

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

145 sdr = create_shader(src, sdr_type);

146

147 free(src);

148 return sdr;

149 }

150

151

152 unsigned int get_vertex_shader(const char *fname)

153 {

154 return get_shader(fname, GL_VERTEX_SHADER);

155 }

156

157 unsigned int get_pixel_shader(const char *fname)

158 {

159 return get_shader(fname, GL_FRAGMENT_SHADER);

160 }

161

162 unsigned int get_tessctl_shader(const char *fname)

163 {

164 return get_shader(fname, GL_TESS_CONTROL_SHADER);

165 }

166

167 unsigned int get_tesseval_shader(const char *fname)

168 {

169 return get_shader(fname, GL_TESS_EVALUATION_SHADER);

170 }

171

172 unsigned int get_geometry_shader(const char *fname)

173 {

174 return get_shader(fname, GL_GEOMETRY_SHADER);

175 }

176

177 unsigned int get_shader(const char *fname, unsigned int sdr_type)

178 {

179 unsigned int sdr;

180 if(!(sdr = load_shader(fname, sdr_type))) {

181 return 0;

182 }

183 return sdr;

184 }

185

186

187 /* ---- gpu programs ---- */

188

189 unsigned int create_program(void)

190 {

191 unsigned int prog = glCreateProgram();

192 assert(glGetError() == GL_NO_ERROR);

193 return prog;

194 }

195

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

197 {

198 unsigned int prog, sdr;

199 va_list ap;

200

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

202 return 0;

203 }

204

205 attach_shader(prog, sdr0);

206 if(glGetError()) {

207 return 0;

208 }

209

210 va_start(ap, sdr0);

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

212 attach_shader(prog, sdr);

213 if(glGetError()) {

214 return 0;

215 }

216 }

217 va_end(ap);

218

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

220 free_program(prog);

221 return 0;

222 }

223 return prog;

224 }

225

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

227 {

228 unsigned int sdr[2];

229 int i = 0;

230

231 if(vfile && *vfile && !(sdr[i++] = get_vertex_shader(vfile))) {

232 return 0;

233 }

234 if(pfile && *pfile && !(sdr[i++] = get_pixel_shader(pfile))) {

235 return 0;

236 }

237 return create_program_link(sdr[0], sdr[1], 0);

238 }

239

240 void free_program(unsigned int sdr)

241 {

242 glDeleteProgram(sdr);

243 }

244

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

246 {

247 glAttachShader(prog, sdr);

248 assert(glGetError() == GL_NO_ERROR);

249 }

250

251 int link_program(unsigned int prog)

252 {

253 int linked, info_len, retval = 0;

254 char *info_str = 0;

255

256 glLinkProgram(prog);

257 assert(glGetError() == GL_NO_ERROR);

258 glGetProgramiv(prog, GL_LINK_STATUS, &linked);

259 assert(glGetError() == GL_NO_ERROR);

260 glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);

261 assert(glGetError() == GL_NO_ERROR);

262

263 if(info_len) {

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

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

266 assert(glGetError() == GL_NO_ERROR);

267 }

268 }

269

270 if(linked) {

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

272 } else {

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

274 retval = -1;

275 }

276

277 free(info_str);

278 return retval;

279 }

280

281 int bind_program(unsigned int prog)

282 {

283 GLenum err;

284

285 glUseProgram(prog);

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

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

288 if(err == GL_INVALID_OPERATION) {

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

290 return -1;

291 }

292 glUseProgram(prog);

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

294 }

295 return -1;

296 }

297 return 0;

298 }

299

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

301 #define BEGIN_UNIFORM_CODE \

302 int loc, curr_prog; \

303 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog); \

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

305 return -1; \

306 } \

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

308

309 #define END_UNIFORM_CODE \

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

311 bind_program(curr_prog); \

312 } \

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

314

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

316 {

317 BEGIN_UNIFORM_CODE {

318 glUniform1i(loc, val);

319 }

320 END_UNIFORM_CODE;

321 }

322

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

324 {

325 BEGIN_UNIFORM_CODE {

326 glUniform1f(loc, val);

327 }

328 END_UNIFORM_CODE;

329 }

330

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

332 {

333 BEGIN_UNIFORM_CODE {

334 glUniform2f(loc, x, y);

335 }

336 END_UNIFORM_CODE;

337 }

338

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

340 {

341 BEGIN_UNIFORM_CODE {

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

343 }

344 END_UNIFORM_CODE;

345 }

346

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

348 {

349 BEGIN_UNIFORM_CODE {

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

351 }

352 END_UNIFORM_CODE;

353 }

354

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

356 {

357 BEGIN_UNIFORM_CODE {

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

359 }

360 END_UNIFORM_CODE;

361 }

362

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

364 {

365 BEGIN_UNIFORM_CODE {

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

367 }

368 END_UNIFORM_CODE;

369 }

370

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

372 {

373 int loc, curr_prog;

374

375 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);

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

377 return -1;

378 }

379

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

381

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

383 bind_program(curr_prog);

384 }

385 return loc;

386 }

387

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

389 {

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

391 }

392

393 static const char *sdrtypestr(unsigned int sdrtype)

394 {

395 switch(sdrtype) {

396 case GL_VERTEX_SHADER:

397 return "vertex";

398 case GL_FRAGMENT_SHADER:

399 return "pixel";

400 case GL_TESS_CONTROL_SHADER:

401 return "tessellation control";

402 case GL_TESS_EVALUATION_SHADER:

403 return "tessellation evaluation";

404 case GL_GEOMETRY_SHADER:

405 return "geometry";

406

407 default:

408 break;

409 }

410 return "<unknown>";

411 }