metasurf

annotate examples/metaballs/src/sdr.c @ 0:7aa4627e492b

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first commit
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 25 Oct 2011 07:34:31 +0300
parents
children 9ab057fba0c5
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <stdlib.h>
nuclear@0 3 #include <string.h>
nuclear@0 4 #include <errno.h>
nuclear@0 5 #include <assert.h>
nuclear@0 6 #include <GL/glew.h>
nuclear@0 7
nuclear@0 8 #if defined(unix) || defined(__unix__)
nuclear@0 9 #include <unistd.h>
nuclear@0 10 #include <sys/stat.h>
nuclear@0 11 #endif /* unix */
nuclear@0 12
nuclear@0 13 #include "sdr.h"
nuclear@0 14
nuclear@0 15 unsigned int create_vertex_shader(const char *src)
nuclear@0 16 {
nuclear@0 17 return create_shader(src, GL_VERTEX_SHADER);
nuclear@0 18 }
nuclear@0 19
nuclear@0 20 unsigned int create_pixel_shader(const char *src)
nuclear@0 21 {
nuclear@0 22 return create_shader(src, GL_FRAGMENT_SHADER);
nuclear@0 23 }
nuclear@0 24
nuclear@0 25 unsigned int create_shader(const char *src, unsigned int sdr_type)
nuclear@0 26 {
nuclear@0 27 unsigned int sdr;
nuclear@0 28 int success, info_len;
nuclear@0 29 char *info_str = 0;
nuclear@0 30 GLenum err;
nuclear@0 31
nuclear@0 32 sdr = glCreateShader(sdr_type);
nuclear@0 33 assert(glGetError() == GL_NO_ERROR);
nuclear@0 34 glShaderSource(sdr, 1, &src, 0);
nuclear@0 35 err = glGetError();
nuclear@0 36 assert(err == GL_NO_ERROR);
nuclear@0 37 glCompileShader(sdr);
nuclear@0 38 assert(glGetError() == GL_NO_ERROR);
nuclear@0 39
nuclear@0 40 glGetShaderiv(sdr, GL_COMPILE_STATUS, &success);
nuclear@0 41 assert(glGetError() == GL_NO_ERROR);
nuclear@0 42 glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);
nuclear@0 43 assert(glGetError() == GL_NO_ERROR);
nuclear@0 44
nuclear@0 45 if(info_len) {
nuclear@0 46 if((info_str = malloc(info_len + 1))) {
nuclear@0 47 glGetShaderInfoLog(sdr, info_len, 0, info_str);
nuclear@0 48 assert(glGetError() == GL_NO_ERROR);
nuclear@0 49 }
nuclear@0 50 }
nuclear@0 51
nuclear@0 52 if(success) {
nuclear@0 53 fprintf(stderr, info_str ? "done: %s\n" : "done\n", info_str);
nuclear@0 54 } else {
nuclear@0 55 fprintf(stderr, info_str ? "failed: %s\n" : "failed\n", info_str);
nuclear@0 56 glDeleteShader(sdr);
nuclear@0 57 sdr = 0;
nuclear@0 58 }
nuclear@0 59
nuclear@0 60 free(info_str);
nuclear@0 61 return sdr;
nuclear@0 62 }
nuclear@0 63
nuclear@0 64 void free_shader(unsigned int sdr)
nuclear@0 65 {
nuclear@0 66 glDeleteShader(sdr);
nuclear@0 67 }
nuclear@0 68
nuclear@0 69 unsigned int load_vertex_shader(const char *fname)
nuclear@0 70 {
nuclear@0 71 return load_shader(fname, GL_VERTEX_SHADER);
nuclear@0 72 }
nuclear@0 73
nuclear@0 74 unsigned int load_pixel_shader(const char *fname)
nuclear@0 75 {
nuclear@0 76 return load_shader(fname, GL_FRAGMENT_SHADER);
nuclear@0 77 }
nuclear@0 78
nuclear@0 79 unsigned int load_shader(const char *fname, unsigned int sdr_type)
nuclear@0 80 {
nuclear@0 81 #if defined(unix) || defined(__unix__)
nuclear@0 82 struct stat st;
nuclear@0 83 #endif
nuclear@0 84 unsigned int sdr;
nuclear@0 85 size_t filesize;
nuclear@0 86 FILE *fp;
nuclear@0 87 char *src;
nuclear@0 88
nuclear@0 89 if(!(fp = fopen(fname, "r"))) {
nuclear@0 90 fprintf(stderr, "failed to open shader %s: %s\n", fname, strerror(errno));
nuclear@0 91 return 0;
nuclear@0 92 }
nuclear@0 93
nuclear@0 94 #if defined(unix) || defined(__unix__)
nuclear@0 95 fstat(fileno(fp), &st);
nuclear@0 96 filesize = st.st_size;
nuclear@0 97 #else
nuclear@0 98 fseek(fp, 0, SEEK_END);
nuclear@0 99 filesize = ftell(fp);
nuclear@0 100 fseek(fp, 0, SEEK_SET);
nuclear@0 101 #endif /* unix */
nuclear@0 102
nuclear@0 103 if(!(src = malloc(filesize + 1))) {
nuclear@0 104 fclose(fp);
nuclear@0 105 return 0;
nuclear@0 106 }
nuclear@0 107 fread(src, 1, filesize, fp);
nuclear@0 108 src[filesize] = 0;
nuclear@0 109 fclose(fp);
nuclear@0 110
nuclear@0 111 fprintf(stderr, "compiling %s shader: %s... ", (sdr_type == GL_VERTEX_SHADER ? "vertex" : "pixel"), fname);
nuclear@0 112 sdr = create_shader(src, sdr_type);
nuclear@0 113
nuclear@0 114 free(src);
nuclear@0 115 return sdr;
nuclear@0 116 }
nuclear@0 117
nuclear@0 118
nuclear@0 119 unsigned int get_vertex_shader(const char *fname)
nuclear@0 120 {
nuclear@0 121 return get_shader(fname, GL_VERTEX_SHADER);
nuclear@0 122 }
nuclear@0 123
nuclear@0 124 unsigned int get_pixel_shader(const char *fname)
nuclear@0 125 {
nuclear@0 126 return get_shader(fname, GL_FRAGMENT_SHADER);
nuclear@0 127 }
nuclear@0 128
nuclear@0 129 unsigned int get_shader(const char *fname, unsigned int sdr_type)
nuclear@0 130 {
nuclear@0 131 unsigned int sdr;
nuclear@0 132
nuclear@0 133 if(!(sdr = load_shader(fname, sdr_type))) {
nuclear@0 134 return 0;
nuclear@0 135 }
nuclear@0 136 return sdr;
nuclear@0 137 }
nuclear@0 138
nuclear@0 139
nuclear@0 140 /* ---- gpu programs ---- */
nuclear@0 141
nuclear@0 142 unsigned int create_program(void)
nuclear@0 143 {
nuclear@0 144 unsigned int prog = glCreateProgram();
nuclear@0 145 assert(glGetError() == GL_NO_ERROR);
nuclear@0 146 return prog;
nuclear@0 147 }
nuclear@0 148
nuclear@0 149 unsigned int create_program_link(unsigned int vs, unsigned int ps)
nuclear@0 150 {
nuclear@0 151 unsigned int prog;
nuclear@0 152
nuclear@0 153 if(!(prog = create_program())) {
nuclear@0 154 return 0;
nuclear@0 155 }
nuclear@0 156
nuclear@0 157 if(vs) {
nuclear@0 158 attach_shader(prog, vs);
nuclear@0 159 assert(glGetError() == GL_NO_ERROR);
nuclear@0 160 }
nuclear@0 161 if(ps) {
nuclear@0 162 attach_shader(prog, ps);
nuclear@0 163 assert(glGetError() == GL_NO_ERROR);
nuclear@0 164 }
nuclear@0 165
nuclear@0 166 if(link_program(prog) == -1) {
nuclear@0 167 free_program(prog);
nuclear@0 168 return 0;
nuclear@0 169 }
nuclear@0 170 return prog;
nuclear@0 171 }
nuclear@0 172
nuclear@0 173 unsigned int create_program_load(const char *vfile, const char *pfile)
nuclear@0 174 {
nuclear@0 175 unsigned int vs = 0, ps = 0;
nuclear@0 176
nuclear@0 177 if(vfile && !(vs = get_vertex_shader(vfile))) {
nuclear@0 178 return 0;
nuclear@0 179 }
nuclear@0 180 if(pfile && !(ps = get_pixel_shader(pfile))) {
nuclear@0 181 return 0;
nuclear@0 182 }
nuclear@0 183 return create_program_link(vs, ps);
nuclear@0 184 }
nuclear@0 185
nuclear@0 186 void free_program(unsigned int sdr)
nuclear@0 187 {
nuclear@0 188 glDeleteProgram(sdr);
nuclear@0 189 }
nuclear@0 190
nuclear@0 191 void attach_shader(unsigned int prog, unsigned int sdr)
nuclear@0 192 {
nuclear@0 193 glAttachShader(prog, sdr);
nuclear@0 194 assert(glGetError() == GL_NO_ERROR);
nuclear@0 195 }
nuclear@0 196
nuclear@0 197 int link_program(unsigned int prog)
nuclear@0 198 {
nuclear@0 199 int linked, info_len, retval = 0;
nuclear@0 200 char *info_str = 0;
nuclear@0 201
nuclear@0 202 glLinkProgram(prog);
nuclear@0 203 assert(glGetError() == GL_NO_ERROR);
nuclear@0 204 glGetProgramiv(prog, GL_LINK_STATUS, &linked);
nuclear@0 205 assert(glGetError() == GL_NO_ERROR);
nuclear@0 206 glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);
nuclear@0 207 assert(glGetError() == GL_NO_ERROR);
nuclear@0 208
nuclear@0 209 if(info_len) {
nuclear@0 210 if((info_str = malloc(info_len + 1))) {
nuclear@0 211 glGetProgramInfoLog(prog, info_len, 0, info_str);
nuclear@0 212 assert(glGetError() == GL_NO_ERROR);
nuclear@0 213 }
nuclear@0 214 }
nuclear@0 215
nuclear@0 216 if(linked) {
nuclear@0 217 fprintf(stderr, info_str ? "linking done: %s\n" : "linking done\n", info_str);
nuclear@0 218 } else {
nuclear@0 219 fprintf(stderr, info_str ? "linking failed: %s\n" : "linking failed\n", info_str);
nuclear@0 220 retval = -1;
nuclear@0 221 }
nuclear@0 222
nuclear@0 223 free(info_str);
nuclear@0 224 return retval;
nuclear@0 225 }
nuclear@0 226
nuclear@0 227 int bind_program(unsigned int prog)
nuclear@0 228 {
nuclear@0 229 GLenum err;
nuclear@0 230
nuclear@0 231 glUseProgram(prog);
nuclear@0 232 if(prog && (err = glGetError()) != GL_NO_ERROR) {
nuclear@0 233 /* maybe the program is not linked, try linking first */
nuclear@0 234 if(err == GL_INVALID_OPERATION) {
nuclear@0 235 if(link_program(prog) == -1) {
nuclear@0 236 return -1;
nuclear@0 237 }
nuclear@0 238 glUseProgram(prog);
nuclear@0 239 return glGetError() == GL_NO_ERROR ? 0 : -1;
nuclear@0 240 }
nuclear@0 241 return -1;
nuclear@0 242 }
nuclear@0 243 return 0;
nuclear@0 244 }
nuclear@0 245
nuclear@0 246 /* ugly but I'm not going to write the same bloody code over and over */
nuclear@0 247 #define BEGIN_UNIFORM_CODE \
nuclear@0 248 int loc, curr_prog; \
nuclear@0 249 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog); \
nuclear@0 250 if(curr_prog != prog && bind_program(prog) == -1) { \
nuclear@0 251 return -1; \
nuclear@0 252 } \
nuclear@0 253 if((loc = glGetUniformLocation(prog, name)) != -1)
nuclear@0 254
nuclear@0 255 #define END_UNIFORM_CODE \
nuclear@0 256 if(curr_prog != prog) { \
nuclear@0 257 bind_program(curr_prog); \
nuclear@0 258 } \
nuclear@0 259 return loc == -1 ? -1 : 0
nuclear@0 260
nuclear@0 261 int set_uniform_int(unsigned int prog, const char *name, int val)
nuclear@0 262 {
nuclear@0 263 BEGIN_UNIFORM_CODE {
nuclear@0 264 glUniform1i(loc, val);
nuclear@0 265 }
nuclear@0 266 END_UNIFORM_CODE;
nuclear@0 267 }
nuclear@0 268
nuclear@0 269 int set_uniform_float(unsigned int prog, const char *name, float val)
nuclear@0 270 {
nuclear@0 271 BEGIN_UNIFORM_CODE {
nuclear@0 272 glUniform1f(loc, val);
nuclear@0 273 }
nuclear@0 274 END_UNIFORM_CODE;
nuclear@0 275 }
nuclear@0 276
nuclear@0 277 int set_uniform_float3(unsigned int prog, const char *name, float x, float y, float z)
nuclear@0 278 {
nuclear@0 279 BEGIN_UNIFORM_CODE {
nuclear@0 280 glUniform3f(loc, x, y, z);
nuclear@0 281 }
nuclear@0 282 END_UNIFORM_CODE;
nuclear@0 283 }
nuclear@0 284
nuclear@0 285 int set_uniform_float4(unsigned int prog, const char *name, float x, float y, float z, float w)
nuclear@0 286 {
nuclear@0 287 BEGIN_UNIFORM_CODE {
nuclear@0 288 glUniform4f(loc, x, y, z, w);
nuclear@0 289 }
nuclear@0 290 END_UNIFORM_CODE;
nuclear@0 291 }
nuclear@0 292
nuclear@0 293 int set_uniform_matrix4(unsigned int prog, const char *name, float *mat)
nuclear@0 294 {
nuclear@0 295 BEGIN_UNIFORM_CODE {
nuclear@0 296 glUniformMatrix4fv(loc, 1, GL_FALSE, mat);
nuclear@0 297 }
nuclear@0 298 END_UNIFORM_CODE;
nuclear@0 299 }
nuclear@0 300
nuclear@0 301 int set_uniform_matrix4_transposed(unsigned int prog, const char *name, float *mat)
nuclear@0 302 {
nuclear@0 303 BEGIN_UNIFORM_CODE {
nuclear@0 304 glUniformMatrix4fv(loc, 1, GL_TRUE, mat);
nuclear@0 305 }
nuclear@0 306 END_UNIFORM_CODE;
nuclear@0 307 }
nuclear@0 308
nuclear@0 309 int get_attrib_loc(unsigned int prog, const char *name)
nuclear@0 310 {
nuclear@0 311 int loc, curr_prog;
nuclear@0 312
nuclear@0 313 glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);
nuclear@0 314 if(curr_prog != prog && bind_program(prog) == -1) {
nuclear@0 315 return -1;
nuclear@0 316 }
nuclear@0 317
nuclear@0 318 loc = glGetAttribLocation(prog, (char*)name);
nuclear@0 319
nuclear@0 320 if(curr_prog != prog) {
nuclear@0 321 bind_program(curr_prog);
nuclear@0 322 }
nuclear@0 323 return loc;
nuclear@0 324 }
nuclear@0 325
nuclear@0 326 void set_attrib_float3(int attr_loc, float x, float y, float z)
nuclear@0 327 {
nuclear@0 328 glVertexAttrib3f(attr_loc, x, y, z);
nuclear@0 329 }