lib/mnit/opengles1.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2011-2013 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # OpenGL ES1 general support (most of it)
  18 module opengles1 is pkgconfig("glesv1_cm", "egl")
  19
  20 import mnit_display
  21
  22 in "C header" `{
  23         #include <EGL/egl.h>
  24         #include <GLES/gl.h>
  25
  26         EGLDisplay mnit_display;
  27         EGLSurface mnit_surface;
  28         EGLContext mnit_context;
  29         EGLConfig mnit_config;
  30         int32_t mnit_width;
  31         int32_t mnit_height;
  32
  33         struct mnit_opengles_Texture {
  34                 GLuint texture;
  35
  36                 /* offsets on source texture */
  37                 float src_xo, src_yo, src_xi, src_yi;
  38
  39                 /* destination width and height */
  40                 int width, height;
  41
  42                 /* may vary depending on scaling */
  43                 int center_x, center_y;
  44
  45                 float scale;
  46                 int blended;
  47         };
  48
  49         struct mnit_opengles_DrawableTexture {
  50                 struct mnit_opengles_Texture super;
  51                 GLuint fbo;
  52                 GLuint depth;
  53                 GLuint color;
  54         };
  55
  56         GLenum mnit_opengles_error_code;
  57
  58         struct mnit_opengles_Texture *mnit_opengles_load_image( const uint_least32_t *pixels, int width, int height, int has_alpha );
  59 `}
  60
  61 in "C" `{
  62         #define LOGW(...) ((void)fprintf(stderr, "# warn: %s (%i)\n", __VA_ARGS__))
  63         #ifdef DEBUG
  64                 #define LOGI(...) ((void)fprintf(stderr, "# info: %s (%i)\n", __VA_ARGS__))
  65         #else
  66                 #define LOGI(...) (void)0
  67         #endif
  68
  69         extern NativeWindowType mnit_window;
  70         extern EGLNativeDisplayType mnit_native_display;
  71
  72         GLfloat mnit_opengles_vertices[6][3] =
  73         {
  74                 {0.0f, 1.0f, 0.0f},
  75                 {1.0f, 1.0f, 0.0f},
  76                 {0.0f, 0.0f, 0.0f},
  77                 {1.0f, 0.0f, 0.0f},
  78         };
  79         GLfloat mnit_opengles_texture[6][2] =
  80         {
  81                 {0.0f, 0.0f},
  82                 {0.0f, 1.0f},
  83                 {1.0f, 1.0f},
  84                 {0.0f, 0.0f},
  85                 {1.0f, 1.0f},
  86                 {1.0f, 0.0f}
  87         };
  88
  89         struct mnit_opengles_Texture *mnit_opengles_load_image( const uint_least32_t *pixels, int width, int height, int has_alpha )
  90         {
  91                 struct mnit_opengles_Texture *image = malloc(sizeof(struct mnit_opengles_Texture));
  92                 int format = has_alpha? GL_RGBA: GL_RGB;
  93
  94                 image->width = width;
  95                 image->height = height;
  96                 image->center_x = width/2;
  97                 image->center_y = height/2;
  98                 image->scale = 1.0f;
  99                 image->blended = has_alpha;
 100
 101                 image->src_xo = 0;
 102                 image->src_yo = 0;
 103                 image->src_xi = 1.0;
 104                 image->src_yi = 1.0;
 105
 106                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 107                         LOGW("error loading image after malloc", mnit_opengles_error_code);
 108                 }
 109
 110                 glGenTextures(1, &image->texture);
 111
 112                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 113                         LOGW("error loading image after glGenTextures", mnit_opengles_error_code);
 114                 }
 115
 116                 glBindTexture(GL_TEXTURE_2D, image->texture);
 117
 118                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 119                         LOGW("error loading image glBindTexture", mnit_opengles_error_code);
 120                 }
 121
 122                 glTexImage2D(   GL_TEXTURE_2D, 0, format, width, height,
 123                                                 0, format, GL_UNSIGNED_BYTE, (GLvoid*)pixels);
 124
 125                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 126                         LOGW("error loading image after glTexImage2D", mnit_opengles_error_code);
 127                 }
 128
 129                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 130
 131                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 132                         LOGW("error loading image after gtTexParameter", mnit_opengles_error_code);
 133                 }
 134
 135                 return image;
 136         }
 137 `}
 138
 139 # OpenGL ES1 display
 140 # Uses 3d hardware optimization
 141 class Opengles1Display
 142         super Display
 143
 144         redef type I: Opengles1Image
 145
 146         init do extern_init
 147         fun midway_init( format: Int ) do end
 148         fun extern_init: Bool is extern import midway_init `{
 149                 /* initialize OpenGL ES and EGL */
 150                 const EGLint attribs[] = {
 151                                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 152                                 EGL_BLUE_SIZE, 8,
 153                                 EGL_GREEN_SIZE, 8,
 154                                 EGL_RED_SIZE, 8,
 155                                 EGL_NONE
 156                 };
 157                 EGLint w, h, dummy, format;
 158                 EGLint numConfigs;
 159                 EGLConfig config;
 160                 EGLSurface surface;
 161                 EGLContext context;
 162
 163                 EGLDisplay display = eglGetDisplay(mnit_native_display);
 164                 if ( display == EGL_NO_DISPLAY) {
 165                         LOGW("Unable to eglGetDisplay", 0);
 166                         return -1;
 167                 }
 168
 169                 if ( eglInitialize(display, 0, 0) == EGL_FALSE) {
 170                         LOGW("Unable to eglInitialize", 0);
 171                         return -1;
 172                 }
 173
 174                 if ( eglChooseConfig(display, attribs, &config, 1, &numConfigs) == EGL_FALSE) {
 175                         LOGW("Unable to eglChooseConfig", 0);
 176                         return -1;
 177                 }
 178
 179                 if ( numConfigs == 0 ) {
 180                         LOGW("No configs available for egl", 0);
 181                         return -1;
 182                 }
 183
 184                 if ( eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format) == EGL_FALSE) {
 185                         LOGW("Unable to eglGetConfigAttrib", 0);
 186                         return -1;
 187                 }
 188
 189                 /* Used by Android to set buffer geometry */
 190                 Opengles1Display_midway_init(recv, format);
 191
 192                 surface = eglCreateWindowSurface(display, config, mnit_window, NULL);
 193                 context = eglCreateContext(display, config, NULL, NULL);
 194
 195                 if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
 196                         LOGW("Unable to eglMakeCurrent", 0);
 197                         return -1;
 198                 }
 199
 200                 eglQuerySurface(display, surface, EGL_WIDTH, &w);
 201                 eglQuerySurface(display, surface, EGL_HEIGHT, &h);
 202
 203                 mnit_display = display;
 204                 mnit_context = context;
 205                 mnit_surface = surface;
 206                 mnit_config = config;
 207                 mnit_width = w;
 208                 mnit_height = h;
 209
 210                 LOGI("surface", (int)surface);
 211                 LOGI("display", (int)display);
 212                 LOGI("width", w);
 213                 LOGI("height", h);
 214
 215                 glViewport(0, 0, mnit_width, mnit_height);
 216                 glMatrixMode(GL_PROJECTION);
 217                 glLoadIdentity();
 218                 glOrthof(0.0f, w, h, 0.0f, 0.0f, 1.0f);
 219                 glMatrixMode(GL_MODELVIEW);
 220
 221                 glFrontFace( GL_CW );
 222
 223                 return 0;
 224         `}
 225
 226         fun close is extern `{
 227                 if ( mnit_display != EGL_NO_DISPLAY) {
 228                         eglMakeCurrent( mnit_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 229                         if ( mnit_context != EGL_NO_CONTEXT) {
 230                                 eglDestroyContext( mnit_display,  mnit_context );
 231                         }
 232                         if ( mnit_surface != EGL_NO_SURFACE) {
 233                                 eglDestroySurface( mnit_display,  mnit_surface );
 234                         }
 235                         eglTerminate( mnit_display);
 236                 }
 237                  mnit_display = EGL_NO_DISPLAY;
 238                  mnit_context = EGL_NO_CONTEXT;
 239                  mnit_surface = EGL_NO_SURFACE;
 240         `}
 241
 242         redef fun begin is extern `{
 243                 glClear(GL_COLOR_BUFFER_BIT);
 244                 glLoadIdentity();
 245         `}
 246
 247         redef fun width: Int is extern `{
 248                 return mnit_width;
 249         `}
 250         redef fun height: Int is extern `{
 251                 return mnit_height;
 252         `}
 253
 254         redef fun finish is extern `{
 255                 eglSwapBuffers( mnit_display, mnit_surface );
 256         `}
 257
 258         redef fun set_viewport( x, y, w, h ) is extern `{
 259                 glLoadIdentity();
 260                 glViewport(0,0, mnit_width, mnit_height );
 261                 glMatrixMode(GL_PROJECTION);
 262                 glLoadIdentity();
 263                 glOrthof(x, x+w, y+h, y, 0.0f, 1.0f);
 264                 glMatrixMode(GL_MODELVIEW);
 265                 glFrontFace( GL_CW );
 266         `}
 267
 268         redef fun blit(image, x, y) do native_blit(image, x.to_f, y.to_f)
 269
 270         private fun native_blit(image: Opengles1Image, x, y: Float)  `{
 271                 GLfloat texture_coord[4][2] =
 272                 {
 273                         {image->src_xo, image->src_yi},
 274                         {image->src_xi, image->src_yi},
 275                         {image->src_xo, image->src_yo},
 276                         {image->src_xi, image->src_yo}
 277                 };
 278
 279                 glLoadIdentity();
 280
 281                 glBindTexture(GL_TEXTURE_2D, image->texture);
 282
 283                 glEnableClientState(GL_VERTEX_ARRAY);
 284                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 285                 glTranslatef( x, y, 0.0f );
 286                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 287
 288                 if ( image->blended ) {
 289                         glEnable(GL_BLEND);
 290                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 291                 }
 292
 293                 glEnable(GL_TEXTURE_2D);
 294                 glDisable(GL_DEPTH_TEST);
 295
 296                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 297                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 298
 299                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 300
 301                 glDisableClientState(GL_VERTEX_ARRAY);
 302                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 303                 if ( image->blended ) glDisable(GL_BLEND);
 304                 glDisable(GL_TEXTURE_2D);
 305
 306                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 307                    LOGW("error drawing", mnit_opengles_error_code);
 308                 }
 309         `}
 310
 311     redef fun blit_centered(img, x, y)
 312     do
 313                 x = x.sub(img.center_x)
 314                 y = y.sub(img.center_y)
 315                 blit(img, x, y)
 316     end
 317
 318         redef fun blit_rotated(image, x, y, angle) do native_blit_rotated(image, x.to_f, y.to_f, angle)
 319
 320         private fun native_blit_rotated(image: Opengles1Image, x, y, angle: Float) `{
 321                 GLfloat texture_coord[4][2] =
 322                 {
 323                         {image->src_xo, image->src_yi},
 324                         {image->src_xi, image->src_yi},
 325                         {image->src_xo, image->src_yo},
 326                         {image->src_xi, image->src_yo}
 327                 };
 328
 329                 glLoadIdentity();
 330
 331                 glBindTexture(GL_TEXTURE_2D, image->texture);
 332
 333                 glEnableClientState(GL_VERTEX_ARRAY);
 334                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 335                 glTranslatef( x, y, 0.0f );
 336                 glRotatef( angle*180.0f/3.14156f, 0, 0, 1.0f );
 337                 glTranslatef( image->width*image->scale/-2, image->height*image->scale/-2, 0.0f );
 338                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 339                 if ( image->blended ) {
 340                         glEnable(GL_BLEND);
 341                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 342                 }
 343                 glEnable(GL_TEXTURE_2D);
 344                 glDisable(GL_DEPTH_TEST);
 345
 346                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 347                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 348
 349                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 350
 351                 glDisableClientState(GL_VERTEX_ARRAY);
 352                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 353                 if ( image->blended ) glDisable(GL_BLEND);
 354                 glDisable(GL_TEXTURE_2D);
 355
 356                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 357                    LOGW("error drawing", mnit_opengles_error_code);
 358                 }
 359         `}
 360
 361         # a = top left, b = bottom left, c = bottom right, d = top right
 362         redef fun blit_stretched(image, ax, ay, bx, by, cx, cy, dx, dy)
 363         do
 364                 native_blit_stretched(image,
 365                         ax.to_f, ay.to_f, bx.to_f, by.to_f,
 366                         cx.to_f, cy.to_f, dx.to_f, dy.to_f)
 367         end
 368
 369         private fun native_blit_stretched(image: I, ax, ay, bx, by, cx, cy, dx, dy: Float) `{
 370                 GLfloat texture_coord[4][2] =
 371                 {
 372                         {image->src_xo, image->src_yi},
 373                         {image->src_xi, image->src_yi},
 374                         {image->src_xo, image->src_yo},
 375                         {image->src_xi, image->src_yo}
 376                 };
 377
 378                 GLfloat mnit_opengles_vertices_stretched[6][3] =
 379                 {
 380                         {bx, by, 0.0f},
 381                         {cx, cy, 0.0f},
 382                         {ax, ay, 0.0f},
 383                         {dx, dy, 0.0f},
 384                 };
 385
 386                 glLoadIdentity();
 387
 388                 glBindTexture(GL_TEXTURE_2D, image->texture);
 389
 390                 glEnableClientState(GL_VERTEX_ARRAY);
 391                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 392
 393                 if ( image->blended ) {
 394                         glEnable(GL_BLEND);
 395                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 396                 }
 397
 398                 glEnable(GL_TEXTURE_2D);
 399                 glDisable(GL_DEPTH_TEST);
 400
 401                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices_stretched);
 402                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 403
 404                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 405
 406                 glDisableClientState(GL_VERTEX_ARRAY);
 407                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 408                 if ( image->blended ) glDisable(GL_BLEND);
 409                 glDisable(GL_TEXTURE_2D);
 410
 411                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 412                    LOGW("error drawing", mnit_opengles_error_code);
 413                 }
 414         `}
 415
 416         redef fun clear( r, g, b: Float ) is extern `{
 417                 glClearColor( r, g, b, 1.0 );
 418                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 419         `}
 420
 421         fun clear_alpha( r, g, b, a: Float ) is extern `{
 422                 glClearColor( r, g, b, a );
 423                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 424         `}
 425
 426         # Set the current color applied to all drawing
 427         #
 428         # require: r, g, b, a in [0.0 .. 1.0]
 429         fun color(r, g, b, a: Float) `{ glColor4f(r, g, b, a); `}
 430
 431         # Reset the current color to opaque white
 432         fun reset_color `{ glColor4f(1.0f, 1.0f, 1.0f, 1.0f); `}
 433 end
 434
 435 extern class Opengles1Image in "C" `{struct mnit_opengles_Texture *`}
 436         super Image
 437
 438     redef fun destroy is extern `{ free( recv ); `}
 439
 440     redef fun width: Int is extern `{ return recv->width; `}
 441     redef fun height: Int is extern `{ return recv->height; `}
 442
 443         fun center_x: Int `{ return recv->center_x; `}
 444         fun center_y: Int `{ return recv->center_y; `}
 445
 446     redef fun scale=( v: Float ) is extern `{
 447                 recv->scale = v;
 448                 recv->center_x = v*recv->width/2;
 449                 recv->center_y = v*recv->height/2;
 450     `}
 451     redef fun scale: Float is extern `{ return recv->scale; `}
 452
 453     redef fun blended=( v: Bool ) is extern `{ recv->blended = v; `}
 454     redef fun blended: Bool is extern `{ return recv->blended; `}
 455
 456     # inherits scale and blend from source
 457     redef fun subimage( x, y, w, h: Int ): Image is extern import Opengles1Image.as( Image ) `{
 458                 struct mnit_opengles_Texture* image =
 459                         malloc( sizeof( struct mnit_opengles_Texture ) );
 460
 461                 image->texture = recv->texture;
 462                 image->width = w;
 463                 image->height = h;
 464                 image->center_x = recv->scale*w/2;
 465                 image->center_y = recv->scale*h/2;
 466                 image->scale = recv->scale;
 467                 image->blended = recv->blended;
 468
 469                 image->src_xo = ((float)x)/recv->width;
 470                 image->src_yo = ((float)y)/recv->height;
 471                 image->src_xi = ((float)x+w)/recv->width;
 472                 image->src_yi = ((float)y+h)/recv->height;
 473
 474                 return Opengles1Image_as_Image( image );
 475     `}
 476 end