istereo2: ea928c313344 src/sanegl.c

istereo2

view src/sanegl.c @ 13:ea928c313344

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 28 Sep 2015 19:04:50 +0300
parents	81d35769f546
children

line source

1 /*

2 SaneGL - a small library to bring back sanity to OpenGL ES 2.x

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 <math.h>

23 #include <assert.h>

25 #include "opengl.h"

27 #ifdef GLDEF

28 #undef GLDEF

29 #endif

30 #include "sanegl.h"

32 #define MMODE_IDX(x) ((x) - GL_MODELVIEW)

33 #define MAT_STACK_SIZE 32

34 #define MAT_IDENT {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}

36 #define MAX_VERTS 512

38 static void gl_draw_immediate(void);

40 typedef struct { float x, y; } vec2_t;

41 typedef struct { float x, y, z; } vec3_t;

42 typedef struct { float x, y, z, w; } vec4_t;

44 static int mm_idx = 0;

45 static float mat_stack[3][MAT_STACK_SIZE][16] = {{MAT_IDENT}, {MAT_IDENT}, {MAT_IDENT}};

46 static int stack_top[3];

47 static float mat_mvp[16];

48 static int mvp_valid;

49 static int prim = -1;

51 static vec3_t cur_normal;

52 static vec4_t cur_color, cur_attrib;

53 static vec2_t cur_texcoord;

55 static vec4_t *vert_arr, *col_arr, *attr_arr;

56 static vec3_t *norm_arr;

57 static vec2_t *texc_arr;

58 /*static unsigned int vbuf, cbuf, nbuf, tbuf, abuf;*/

59 static int vloc, nloc, cloc, tloc, aloc = -1;

61 static int num_verts, vert_calls;

62 static int cur_prog;

65 void gl_matrix_mode(int mm)

66 {

67 mm_idx = MMODE_IDX(mm);

68 }

70 void gl_push_matrix(void)

71 {

72 int top = stack_top[mm_idx];

74 memcpy(mat_stack[mm_idx][top + 1], mat_stack[mm_idx][top], 16 * sizeof(float));

75 stack_top[mm_idx]++;

76 mvp_valid = 0;

77 }

79 void gl_pop_matrix(void)

80 {

81 stack_top[mm_idx]--;

82 mvp_valid = 0;

83 }

85 void gl_load_identity(void)

86 {

87 static const float idmat[] = MAT_IDENT;

88 int top = stack_top[mm_idx];

89 float *mat = mat_stack[mm_idx][top];

91 memcpy(mat, idmat, sizeof idmat);

92 mvp_valid = 0;

93 }

95 void gl_load_matrixf(const float *m)

96 {

97 int top = stack_top[mm_idx];

98 float *mat = mat_stack[mm_idx][top];

100 memcpy(mat, m, 16 * sizeof *mat);

101 mvp_valid = 0;

102 }

103

104 #define M(i, j) ((i << 2) + j)

105

106 void gl_mult_matrixf(const float *m2)

107 {

108 int i, j;

109 int top = stack_top[mm_idx];

110 float *m1 = mat_stack[mm_idx][top];

111 float res[16];

112

113 for(i=0; i<4; i++) {

114 for(j=0; j<4; j++) {

115 res[M(i,j)] = m1[M(i,0)] * m2[M(0,j)] +

116 m1[M(i,1)] * m2[M(1,j)] +

117 m1[M(i,2)] * m2[M(2,j)] +

118 m1[M(i,3)] * m2[M(3,j)];

119 }

120 }

121

122 memcpy(m1, res, sizeof res);

123 mvp_valid = 0;

124 }

125

126 void gl_translatef(float x, float y, float z)

127 {

128 float mat[] = MAT_IDENT;

129

130 mat[12] = x;

131 mat[13] = y;

132 mat[14] = z;

133

134 gl_mult_matrixf(mat);

135 }

136

137 void gl_rotatef(float angle, float x, float y, float z)

138 {

139 float mat[] = MAT_IDENT;

140

141 float angle_rad = M_PI * angle / 180.0;

142 float sina = sin(angle_rad);

143 float cosa = cos(angle_rad);

144 float one_minus_cosa = 1.0 - cosa;

145 float nxsq = x * x;

146 float nysq = y * y;

147 float nzsq = z * z;

148

149 mat[0] = nxsq + (1.0 - nxsq) * cosa;

150 mat[4] = x * y * one_minus_cosa - z * sina;

151 mat[8] = x * z * one_minus_cosa + y * sina;

152 mat[1] = x * y * one_minus_cosa + z * sina;

153 mat[5] = nysq + (1.0 - nysq) * cosa;

154 mat[9] = y * z * one_minus_cosa - x * sina;

155 mat[2] = x * z * one_minus_cosa - y * sina;

156 mat[6] = y * z * one_minus_cosa + x * sina;

157 mat[10] = nzsq + (1.0 - nzsq) * cosa;

158

159 gl_mult_matrixf(mat);

160 }

161

162 void gl_scalef(float x, float y, float z)

163 {

164 float mat[] = MAT_IDENT;

165

166 mat[0] = x;

167 mat[5] = y;

168 mat[10] = z;

169

170 gl_mult_matrixf(mat);

171 }

172

173 void gl_ortho(float left, float right, float bottom, float top, float near, float far)

174 {

175 float mat[] = MAT_IDENT;

176

177 float dx = right - left;

178 float dy = top - bottom;

179 float dz = far - near;

180

181 float tx = -(right + left) / dx;

182 float ty = -(top + bottom) / dy;

183 float tz = -(far + near) / dz;

184

185 float sx = 2.0 / dx;

186 float sy = 2.0 / dy;

187 float sz = -2.0 / dz;

188

189 mat[0] = sx;

190 mat[5] = sy;

191 mat[10] = sz;

192 mat[12] = tx;

193 mat[13] = ty;

194 mat[14] = tz;

195

196 gl_mult_matrixf(mat);

197 }

198

199 void gl_frustum(float left, float right, float bottom, float top, float near, float far)

200 {

201 float mat[] = MAT_IDENT;

202

203 float dx = right - left;

204 float dy = top - bottom;

205 float dz = far - near;

206

207 float a = (right + left) / dx;

208 float b = (top + bottom) / dy;

209 float c = -(far + near) / dz;

210 float d = -2.0 * far * near / dz;

211

212 mat[0] = 2.0 * near / dx;

213 mat[5] = 2.0 * near / dy;

214 mat[8] = a;

215 mat[9] = b;

216 mat[10] = c;

217 mat[11] = -1.0;

218 mat[14] = d;

219

220 gl_mult_matrixf(mat);

221 }

222

223 void glu_perspective(float vfov, float aspect, float near, float far)

224 {

225 float vfov_rad = M_PI * vfov / 180.0;

226 float x = near * tan(vfov_rad / 2.0);

227 gl_frustum(-aspect * x, aspect * x, -x, x, near, far);

228 }

229

230 void gl_apply_xform(unsigned int prog)

231 {

232 int loc, mvidx, pidx, tidx, mvtop, ptop, ttop;

233

234 mvidx = MMODE_IDX(GL_MODELVIEW);

235 pidx = MMODE_IDX(GL_PROJECTION);

236 tidx = MMODE_IDX(GL_TEXTURE);

237

238 mvtop = stack_top[mvidx];

239 ptop = stack_top[pidx];

240 ttop = stack_top[tidx];

241

242 assert(prog);

243

244 if((loc = glGetUniformLocation(prog, "matrix_modelview")) != -1) {

245 glUniformMatrix4fv(loc, 1, 0, mat_stack[mvidx][mvtop]);

246 }

247

248 if((loc = glGetUniformLocation(prog, "matrix_projection")) != -1) {

249 glUniformMatrix4fv(loc, 1, 0, mat_stack[pidx][ptop]);

250 }

251

252 if((loc = glGetUniformLocation(prog, "matrix_texture")) != -1) {

253 glUniformMatrix4fv(loc, 1, 0, mat_stack[tidx][ttop]);

254 }

255

256 if((loc = glGetUniformLocation(prog, "matrix_normal")) != -1) {

257 float nmat[9];

258

259 nmat[0] = mat_stack[mvidx][mvtop][0];

260 nmat[1] = mat_stack[mvidx][mvtop][1];

261 nmat[2] = mat_stack[mvidx][mvtop][2];

262 nmat[3] = mat_stack[mvidx][mvtop][4];

263 nmat[4] = mat_stack[mvidx][mvtop][5];

264 nmat[5] = mat_stack[mvidx][mvtop][6];

265 nmat[6] = mat_stack[mvidx][mvtop][8];

266 nmat[7] = mat_stack[mvidx][mvtop][9];

267 nmat[8] = mat_stack[mvidx][mvtop][10];

268 glUniformMatrix3fv(loc, 1, 0, nmat);

269 }

270

271 if((loc = glGetUniformLocation(prog, "matrix_modelview_projection")) != -1) {

272 if(!mvp_valid) {

273 /* TODO calc mvp */

274 }

275 glUniformMatrix4fv(loc, 1, 0, mat_mvp);

276 }

277 }

278

279

280 /* immediate mode rendering */

281 void gl_begin(int p)

282 {

283 if(!vert_arr) {

284 vert_arr = malloc(MAX_VERTS * sizeof *vert_arr);

285 norm_arr = malloc(MAX_VERTS * sizeof *norm_arr);

286 texc_arr = malloc(MAX_VERTS * sizeof *texc_arr);

287 col_arr = malloc(MAX_VERTS * sizeof *col_arr);

288 attr_arr = malloc(MAX_VERTS * sizeof *attr_arr);

289 assert(vert_arr && norm_arr && texc_arr && col_arr && attr_arr);

290 }

291

292 prim = p;

293 num_verts = vert_calls = 0;

294

295 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_prog);

296 assert(cur_prog);

297

298 gl_apply_xform(cur_prog);

299

300 vloc = glGetAttribLocation(cur_prog, "attr_vertex");

301 nloc = glGetAttribLocation(cur_prog, "attr_normal");

302 cloc = glGetAttribLocation(cur_prog, "attr_color");

303 tloc = glGetAttribLocation(cur_prog, "attr_texcoord");

304 }

305

306 void gl_end(void)

307 {

308 if(num_verts > 0) {

309 gl_draw_immediate();

310 }

311 aloc = -1;

312 }

313

314 static void gl_draw_immediate(void)

315 {

316 int glprim;

317

318 if(vloc == -1) {

319 fprintf(stderr, "gl_draw_immediate call with vloc == -1\n");

320 return;

321 }

322

323 glprim = prim == GL_QUADS ? GL_TRIANGLES : prim;

324

325 glVertexAttribPointer(vloc, 4, GL_FLOAT, 0, 0, vert_arr);

326 glEnableVertexAttribArray(vloc);

327

328 if(nloc != -1) {

329 glVertexAttribPointer(nloc, 3, GL_FLOAT, 0, 0, norm_arr);

330 glEnableVertexAttribArray(nloc);

331 }

332

333 if(cloc != -1) {

334 glVertexAttribPointer(cloc, 4, GL_FLOAT, 1, 0, col_arr);

335 glEnableVertexAttribArray(cloc);

336 }

337

338 if(tloc != -1) {

339 glVertexAttribPointer(tloc, 2, GL_FLOAT, 0, 0, texc_arr);

340 glEnableVertexAttribArray(tloc);

341 }

342

343 if(aloc != -1) {

344 glVertexAttribPointer(aloc, 4, GL_FLOAT, 0, 0, attr_arr);

345 glEnableVertexAttribArray(aloc);

346 }

347

348 glDrawArrays(glprim, 0, num_verts);

349

350 glDisableVertexAttribArray(vloc);

351 if(nloc != -1) {

352 glDisableVertexAttribArray(nloc);

353 }

354 if(cloc != -1) {

355 glDisableVertexAttribArray(cloc);

356 }

357 if(tloc != -1) {

358 glDisableVertexAttribArray(tloc);

359 }

360 if(aloc != -1) {

361 glDisableVertexAttribArray(aloc);

362 }

363 }

364

365

366 void gl_vertex2f(float x, float y)

367 {

368 gl_vertex4f(x, y, 0.0f, 1.0f);

369 }

370

371 void gl_vertex3f(float x, float y, float z)

372 {

373 gl_vertex4f(x, y, z, 1.0f);

374 }

375

376 void gl_vertex4f(float x, float y, float z, float w)

377 {

378 int i, buffer_full;

379

380 if(prim == GL_QUADS && vert_calls % 4 == 3) {

381 for(i=0; i<2; i++) {

382 if(aloc != -1) {

383 attr_arr[num_verts] = attr_arr[num_verts - 3 + i];

384 }

385 if(cloc != -1) {

386 col_arr[num_verts] = col_arr[num_verts - 3 + i];

387 }

388 if(tloc != -1) {

389 texc_arr[num_verts] = texc_arr[num_verts - 3 + i];

390 }

391 if(nloc != -1) {

392 norm_arr[num_verts] = norm_arr[num_verts - 3 + i];

393 }

394 vert_arr[num_verts] = vert_arr[num_verts - 3 + i];

395 num_verts++;

396 }

397 }

398

399 vert_arr[num_verts].x = x;

400 vert_arr[num_verts].y = y;

401 vert_arr[num_verts].z = z;

402 vert_arr[num_verts].w = w;

403

404 if(cloc != -1) {

405 col_arr[num_verts] = cur_color;

406 }

407 if(nloc != -1) {

408 norm_arr[num_verts] = cur_normal;

409 }

410 if(tloc != -1) {

411 texc_arr[num_verts] = cur_texcoord;

412 }

413 if(aloc != -1) {

414 attr_arr[num_verts] = cur_attrib;

415 }

416

417 vert_calls++;

418 num_verts++;

419

420 if(prim == GL_QUADS) {

421 /* leave space for 6 more worst-case and don't allow flushes mid-quad */

422 buffer_full = num_verts >= MAX_VERTS - 6 && vert_calls % 4 == 0;

423 } else {

424 buffer_full = num_verts >= MAX_VERTS - prim;

425 }

426

427 if(buffer_full) {

428 gl_draw_immediate();

429 gl_begin(prim); /* reset everything */

430 }

431 }

432

433

434 void gl_normal3f(float x, float y, float z)

435 {

436 cur_normal.x = x;

437 cur_normal.y = y;

438 cur_normal.z = z;

439 }

440

441

442 void gl_color3f(float r, float g, float b)

443 {

444 cur_color.x = r;

445 cur_color.y = g;

446 cur_color.z = b;

447 cur_color.w = 1.0f;

448 }

449

450 void gl_color4f(float r, float g, float b, float a)

451 {

452 cur_color.x = r;

453 cur_color.y = g;

454 cur_color.z = b;

455 cur_color.w = a;

456 }

457

458

459 void gl_texcoord1f(float s)

460 {

461 cur_texcoord.x = s;

462 cur_texcoord.y = 0.0f;

463 }

464

465 void gl_texcoord2f(float s, float t)

466 {

467 cur_texcoord.x = s;

468 cur_texcoord.y = t;

469 }

470

471 void gl_vertex_attrib2f(int loc, float x, float y)

472 {

473 aloc = loc;

474 cur_attrib.x = x;

475 cur_attrib.y = y;

476 cur_attrib.z = 0.0f;

477 cur_attrib.w = 1.0f;

478 }

479

480 void gl_vertex_attrib3f(int loc, float x, float y, float z)

481 {

482 aloc = loc;

483 cur_attrib.x = x;

484 cur_attrib.y = y;

485 cur_attrib.z = z;

486 cur_attrib.w = 1.0f;

487 }

488

489 void gl_vertex_attrib4f(int loc, float x, float y, float z, float w)

490 {

491 aloc = loc;

492 cur_attrib.x = x;

493 cur_attrib.y = y;

494 cur_attrib.z = z;

495 cur_attrib.w = w;

496 }