istereo2: 2b85d05df3f2 src/sdr.c

istereo2

view src/sdr.c @ 20:2b85d05df3f2

animation controls for easier screenshot grabbing

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 02 Oct 2015 04:54:55 +0300
parents
children	9d53a4938ce8

line source

1 /*

2 Stereoscopic tunnel for iOS.

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

19 #include <stdio.h>

20 #include <stdlib.h>

21 #include <string.h>

22 #include <errno.h>

23 #include <assert.h>

24 #include "opengl.h"

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

27 #include <unistd.h>

28 #include <sys/stat.h>

29 #endif /* unix */

31 #include "sdr.h"

34 unsigned int create_vertex_shader(const char *src)

35 {

36 return create_shader(src, GL_VERTEX_SHADER);

37 }

39 unsigned int create_pixel_shader(const char *src)

40 {

41 return create_shader(src, GL_FRAGMENT_SHADER);

42 }

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

45 {

46 unsigned int sdr;

47 int success, info_len;

48 char *info_str = 0;

49 GLenum err;

51 sdr = glCreateShader(sdr_type);

52 assert(glGetError() == GL_NO_ERROR);

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

54 err = glGetError();

55 assert(err == GL_NO_ERROR);

56 glCompileShader(sdr);

57 assert(glGetError() == GL_NO_ERROR);

59 glGetShaderiv(sdr, GL_COMPILE_STATUS, &success);

60 assert(glGetError() == GL_NO_ERROR);

61 glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);

62 assert(glGetError() == GL_NO_ERROR);

64 if(info_len) {

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

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

67 assert(glGetError() == GL_NO_ERROR);

68 }

69 }

71 if(success) {

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

73 } else {

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

75 glDeleteShader(sdr);

76 sdr = 0;

77 }

79 free(info_str);

80 return sdr;

81 }

83 void free_shader(unsigned int sdr)

84 {

85 glDeleteShader(sdr);

86 }

88 unsigned int load_vertex_shader(const char *fname)

89 {

90 return load_shader(fname, GL_VERTEX_SHADER);

91 }

93 unsigned int load_pixel_shader(const char *fname)

94 {

95 return load_shader(fname, GL_FRAGMENT_SHADER);

96 }

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

99 {

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

101 struct stat st;

102 #endif

103 unsigned int sdr;

104 size_t filesize;

105 FILE *fp;

106 char *src;

107

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

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

110 return 0;

111 }

112

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

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

115 filesize = st.st_size;

116 #else

117 fseek(fp, 0, SEEK_END);

118 filesize = ftell(fp);

119 fseek(fp, 0, SEEK_SET);

120 #endif /* unix */

121

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

123 fclose(fp);

124 return 0;

125 }

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

127 src[filesize] = 0;

128 fclose(fp);

129

130 fprintf(stderr, "compiling %s shader: %s... ", (sdr_type == GL_VERTEX_SHADER ? "vertex" : "pixel"), fname);

131 sdr = create_shader(src, sdr_type);

132

133 free(src);

134 return sdr;

135 }

136

137

138 unsigned int get_vertex_shader(const char *fname)

139 {

140 return get_shader(fname, GL_VERTEX_SHADER);

141 }

142

143 unsigned int get_pixel_shader(const char *fname)

144 {

145 return get_shader(fname, GL_FRAGMENT_SHADER);

146 }

147

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

149 {

150 unsigned int sdr;

151

152 if(!fname || !(sdr = load_shader(fname, sdr_type))) {

153 return 0;

154 }

155 return sdr;

156 }

157

158

159 /* ---- gpu programs ---- */

160

161 unsigned int create_program(void)

162 {

163 unsigned int prog = glCreateProgram();

164 assert(glGetError() == GL_NO_ERROR);

165 return prog;

166 }

167

168 unsigned int create_program_link(unsigned int vs, unsigned int ps)

169 {

170 unsigned int prog;

171

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

173 return 0;

174 }

175

176 attach_shader(prog, vs);

177 assert(glGetError() == GL_NO_ERROR);

178 attach_shader(prog, ps);

179 assert(glGetError() == GL_NO_ERROR);

180

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

182 free_program(prog);

183 return 0;

184 }

185 return prog;

186 }

187

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

189 {

190 unsigned int vs, ps;

191

192 if(!(vs = get_vertex_shader(vfile)) || !(ps = get_pixel_shader(pfile))) {

193 return 0;

194 }

195 return create_program_link(vs, ps);

196 }

197

198 void free_program(unsigned int sdr)

199 {

200 glDeleteProgram(sdr);

201 }

202

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

204 {

205 glAttachShader(prog, sdr);

206 assert(glGetError() == GL_NO_ERROR);

207 }

208

209 int link_program(unsigned int prog)

210 {

211 int linked, info_len, retval = 0;

212 char *info_str = 0;

213

214 glLinkProgram(prog);

215 assert(glGetError() == GL_NO_ERROR);

216 glGetProgramiv(prog, GL_LINK_STATUS, &linked);

217 assert(glGetError() == GL_NO_ERROR);

218 glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);

219 assert(glGetError() == GL_NO_ERROR);

220

221 if(info_len) {

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

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

224 assert(glGetError() == GL_NO_ERROR);

225 }

226 }

227

228 if(linked) {

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

230 } else {

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

232 retval = -1;

233 }

234

235 free(info_str);

236 return retval;

237 }

238

239 int bind_program(unsigned int prog)

240 {

241 GLenum err;

242

243 glUseProgram(prog);

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

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

246 if(err == GL_INVALID_OPERATION) {

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

248 return -1;

249 }

250 glUseProgram(prog);

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

252 }

253 return -1;

254 }

255 return 0;

256 }

257

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

259 #define BEGIN_UNIFORM_CODE \

260 int loc, curr_prog; \

261 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog); \

262 if(curr_prog != prog && bind_program(prog) == -1) { \

263 return -1; \

264 } \

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

266

267 #define END_UNIFORM_CODE \

268 if(curr_prog != prog) { \

269 bind_program(curr_prog); \

270 } \

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

272

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

274 {

275 BEGIN_UNIFORM_CODE {

276 glUniform1i(loc, val);

277 }

278 END_UNIFORM_CODE;

279 }

280

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

282 {

283 BEGIN_UNIFORM_CODE {

284 glUniform1f(loc, val);

285 }

286 END_UNIFORM_CODE;

287 }

288

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

290 {

291 BEGIN_UNIFORM_CODE {

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

293 }

294 END_UNIFORM_CODE;

295 }

296

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

298 {

299 BEGIN_UNIFORM_CODE {

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

301 }

302 END_UNIFORM_CODE;

303 }

304

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

306 {

307 BEGIN_UNIFORM_CODE {

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

309 }

310 END_UNIFORM_CODE;

311 }

312

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

314 {

315 BEGIN_UNIFORM_CODE {

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

317 }

318 END_UNIFORM_CODE;

319 }

320

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

322 {

323 int loc, curr_prog;

324

325 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);

326 if(curr_prog != prog && bind_program(prog) == -1) {

327 return -1;

328 }

329

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

331

332 if(curr_prog != prog) {

333 bind_program(curr_prog);

334 }

335 return loc;

336 }

337

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

339 {

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

341 }