istereo: 73813c1176de src/sanegl.c

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view src/sanegl.c @ 43:73813c1176de

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 14 Aug 2015 04:33:42 +0300
parents	75a63f9ab7cc
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>

24 #include "sanegl.h"

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

27 #define MAT_STACK_SIZE 32

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

30 #define MAX_VERTS 512

32 static void gl_draw_immediate(void);

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

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

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

38 static int mm_idx = 0;

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

40 static int stack_top[3];

41 static float mat_mvp[16];

42 static int mvp_valid;

43 static int prim = -1;

45 static vec3_t cur_normal;

46 static vec4_t cur_color, cur_attrib;

47 static vec2_t cur_texcoord;

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

50 static vec3_t *norm_arr;

51 static vec2_t *texc_arr;

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

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

55 static int num_verts, vert_calls;

56 static int cur_prog;

59 void gl_matrix_mode(int mm)

60 {

61 mm_idx = MMODE_IDX(mm);

62 }

64 void gl_push_matrix(void)

65 {

66 int top = stack_top[mm_idx];

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

69 stack_top[mm_idx]++;

70 mvp_valid = 0;

71 }

73 void gl_pop_matrix(void)

74 {

75 stack_top[mm_idx]--;

76 mvp_valid = 0;

77 }

79 void gl_load_identity(void)

80 {

81 static const float idmat[] = MAT_IDENT;

82 int top = stack_top[mm_idx];

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

85 memcpy(mat, idmat, sizeof idmat);

86 mvp_valid = 0;

87 }

89 void gl_load_matrixf(const float *m)

90 {

91 int top = stack_top[mm_idx];

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

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

95 mvp_valid = 0;

96 }

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

100 void gl_mult_matrixf(const float *m2)

101 {

102 int i, j;

103 int top = stack_top[mm_idx];

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

105 float res[16];

106

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

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

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

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

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

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

113 }

114 }

115

116 memcpy(m1, res, sizeof res);

117 mvp_valid = 0;

118 }

119

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

121 {

122 float mat[] = MAT_IDENT;

123

124 mat[12] = x;

125 mat[13] = y;

126 mat[14] = z;

127

128 gl_mult_matrixf(mat);

129 }

130

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

132 {

133 float mat[] = MAT_IDENT;

134

135 float angle_rad = M_PI * angle / 180.0;

136 float sina = sin(angle_rad);

137 float cosa = cos(angle_rad);

138 float one_minus_cosa = 1.0 - cosa;

139 float nxsq = x * x;

140 float nysq = y * y;

141 float nzsq = z * z;

142

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

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

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

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

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

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

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

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

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

152

153 gl_mult_matrixf(mat);

154 }

155

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

157 {

158 float mat[] = MAT_IDENT;

159

160 mat[0] = x;

161 mat[5] = y;

162 mat[10] = z;

163

164 gl_mult_matrixf(mat);

165 }

166

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

168 {

169 float mat[] = MAT_IDENT;

170

171 float dx = right - left;

172 float dy = top - bottom;

173 float dz = far - near;

174

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

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

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

178

179 float sx = 2.0 / dx;

180 float sy = 2.0 / dy;

181 float sz = -2.0 / dz;

182

183 mat[0] = sx;

184 mat[5] = sy;

185 mat[10] = sz;

186 mat[12] = tx;

187 mat[13] = ty;

188 mat[14] = tz;

189

190 gl_mult_matrixf(mat);

191 }

192

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

194 {

195 float mat[] = MAT_IDENT;

196

197 float dx = right - left;

198 float dy = top - bottom;

199 float dz = far - near;

200

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

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

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

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

205

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

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

208 mat[8] = a;

209 mat[9] = b;

210 mat[10] = c;

211 mat[11] = -1.0;

212 mat[14] = d;

213

214 gl_mult_matrixf(mat);

215 }

216

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

218 {

219 float vfov_rad = M_PI * vfov / 180.0;

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

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

222 }

223

224 void gl_apply_xform(unsigned int prog)

225 {

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

227

228 mvidx = MMODE_IDX(GL_MODELVIEW);

229 pidx = MMODE_IDX(GL_PROJECTION);

230 tidx = MMODE_IDX(GL_TEXTURE);

231

232 mvtop = stack_top[mvidx];

233 ptop = stack_top[pidx];

234 ttop = stack_top[tidx];

235

236 assert(prog);

237

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

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

240 }

241

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

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

244 }

245

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

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

248 }

249

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

251 float nmat[9];

252

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

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

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

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

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

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

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

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

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

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

263 }

264

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

266 if(!mvp_valid) {

267 /* TODO calc mvp */

268 }

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

270 }

271 }

272

273

274 /* immediate mode rendering */

275 void gl_begin(int p)

276 {

277 if(!vert_arr) {

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

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

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

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

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

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

284 }

285

286 prim = p;

287 num_verts = vert_calls = 0;

288

289 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_prog);

290 assert(cur_prog);

291

292 gl_apply_xform(cur_prog);

293

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

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

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

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

298 }

299

300 void gl_end(void)

301 {

302 if(num_verts > 0) {

303 gl_draw_immediate();

304 }

305 aloc = -1;

306 }

307

308 static void gl_draw_immediate(void)

309 {

310 int glprim;

311

312 if(vloc == -1) {

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

314 return;

315 }

316

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

318

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

320 glEnableVertexAttribArray(vloc);

321

322 if(nloc != -1) {

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

324 glEnableVertexAttribArray(nloc);

325 }

326

327 if(cloc != -1) {

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

329 glEnableVertexAttribArray(cloc);

330 }

331

332 if(tloc != -1) {

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

334 glEnableVertexAttribArray(tloc);

335 }

336

337 if(aloc != -1) {

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

339 glEnableVertexAttribArray(aloc);

340 }

341

342 glDrawArrays(glprim, 0, num_verts);

343

344 glDisableVertexAttribArray(vloc);

345 if(nloc != -1) {

346 glDisableVertexAttribArray(nloc);

347 }

348 if(cloc != -1) {

349 glDisableVertexAttribArray(cloc);

350 }

351 if(tloc != -1) {

352 glDisableVertexAttribArray(tloc);

353 }

354 if(aloc != -1) {

355 glDisableVertexAttribArray(aloc);

356 }

357 }

358

359

360 void gl_vertex2f(float x, float y)

361 {

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

363 }

364

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

366 {

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

368 }

369

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

371 {

372 int i, buffer_full;

373

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

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

376 if(aloc != -1) {

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

378 }

379 if(cloc != -1) {

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

381 }

382 if(tloc != -1) {

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

384 }

385 if(nloc != -1) {

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

387 }

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

389 num_verts++;

390 }

391 }

392

393 vert_arr[num_verts].x = x;

394 vert_arr[num_verts].y = y;

395 vert_arr[num_verts].z = z;

396 vert_arr[num_verts].w = w;

397

398 if(cloc != -1) {

399 col_arr[num_verts] = cur_color;

400 }

401 if(nloc != -1) {

402 norm_arr[num_verts] = cur_normal;

403 }

404 if(tloc != -1) {

405 texc_arr[num_verts] = cur_texcoord;

406 }

407 if(aloc != -1) {

408 attr_arr[num_verts] = cur_attrib;

409 }

410

411 vert_calls++;

412 num_verts++;

413

414 if(prim == GL_QUADS) {

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

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

417 } else {

418 buffer_full = num_verts >= MAX_VERTS - prim;

419 }

420

421 if(buffer_full) {

422 gl_draw_immediate();

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

424 }

425 }

426

427

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

429 {

430 cur_normal.x = x;

431 cur_normal.y = y;

432 cur_normal.z = z;

433 }

434

435

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

437 {

438 cur_color.x = r;

439 cur_color.y = g;

440 cur_color.z = b;

441 cur_color.w = 1.0f;

442 }

443

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

445 {

446 cur_color.x = r;

447 cur_color.y = g;

448 cur_color.z = b;

449 cur_color.w = a;

450 }

451

452

453 void gl_texcoord1f(float s)

454 {

455 cur_texcoord.x = s;

456 cur_texcoord.y = 0.0f;

457 }

458

459 void gl_texcoord2f(float s, float t)

460 {

461 cur_texcoord.x = s;

462 cur_texcoord.y = t;

463 }

464

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

466 {

467 aloc = loc;

468 cur_attrib.x = x;

469 cur_attrib.y = y;

470 cur_attrib.z = 0.0f;

471 cur_attrib.w = 1.0f;

472 }

473

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

475 {

476 aloc = loc;

477 cur_attrib.x = x;

478 cur_attrib.y = y;

479 cur_attrib.z = z;

480 cur_attrib.w = 1.0f;

481 }

482

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

484 {

485 aloc = loc;

486 cur_attrib.x = x;

487 cur_attrib.y = y;

488 cur_attrib.z = z;

489 cur_attrib.w = w;

490 }