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(
  59                 const uint_least32_t *pixels, int width, int height,
  60                 int width_pow2, int height_pow2, int has_alpha);
  61 `}
  62
  63 in "C" `{
  64         extern NativeWindowType mnit_window;
  65         extern EGLNativeDisplayType mnit_native_display;
  66
  67         GLfloat mnit_opengles_vertices[6][3] =
  68         {
  69                 {0.0f, 1.0f, 0.0f},
  70                 {1.0f, 1.0f, 0.0f},
  71                 {0.0f, 0.0f, 0.0f},
  72                 {1.0f, 0.0f, 0.0f},
  73         };
  74         GLfloat mnit_opengles_texture[6][2] =
  75         {
  76                 {0.0f, 0.0f},
  77                 {0.0f, 1.0f},
  78                 {1.0f, 1.0f},
  79                 {0.0f, 0.0f},
  80                 {1.0f, 1.0f},
  81                 {1.0f, 0.0f}
  82         };
  83
  84         struct mnit_opengles_Texture *mnit_opengles_load_image(
  85                 const uint_least32_t *pixels, int width, int height,
  86                 int width_pow2, int height_pow2, int has_alpha)
  87         {
  88                 struct mnit_opengles_Texture *image = malloc(sizeof(struct mnit_opengles_Texture));
  89                 int format = has_alpha? GL_RGBA: GL_RGB;
  90
  91                 image->width = width;
  92                 image->height = height;
  93                 image->center_x = width/2;
  94                 image->center_y = height/2;
  95                 image->scale = 1.0f;
  96                 image->blended = has_alpha;
  97
  98                 image->src_xo = 0;
  99                 image->src_yo = 0;
 100                 image->src_xi = ((float)width)/width_pow2;
 101                 image->src_yi = ((float)height)/height_pow2;
 102
 103                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 104                         PRINT_ERROR("error loading image after malloc: %i", mnit_opengles_error_code);
 105                 }
 106
 107                 glGenTextures(1, &image->texture);
 108
 109                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 110                         PRINT_ERROR("error loading image after glGenTextures: %i", mnit_opengles_error_code);
 111                 }
 112
 113                 glBindTexture(GL_TEXTURE_2D, image->texture);
 114
 115                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 116                         PRINT_ERROR("error loading image glBindTexture: %i", mnit_opengles_error_code);
 117                 }
 118
 119                 glTexImage2D(   GL_TEXTURE_2D, 0, format, width_pow2, height_pow2,
 120                                                 0, format, GL_UNSIGNED_BYTE, (GLvoid*)pixels);
 121
 122                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 123                         PRINT_ERROR("error loading image after glTexImage2D: %i", mnit_opengles_error_code);
 124                 }
 125
 126                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 127
 128                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 129                         PRINT_ERROR("error loading image after gtTexParameter: %i", mnit_opengles_error_code);
 130                 }
 131
 132                 return image;
 133         }
 134 `}
 135
 136 # OpenGL ES1 display
 137 # Uses 3d hardware optimization
 138 class Opengles1Display
 139         super Display
 140
 141         redef type I: Opengles1Image
 142
 143         init do extern_init
 144         fun midway_init( format: Int ) do end
 145         fun extern_init: Bool is extern import midway_init `{
 146                 /* initialize OpenGL ES and EGL */
 147                 const EGLint attribs[] = {
 148                                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 149                                 EGL_BLUE_SIZE, 8,
 150                                 EGL_GREEN_SIZE, 8,
 151                                 EGL_RED_SIZE, 8,
 152                                 EGL_NONE
 153                 };
 154                 EGLint w, h, dummy, format;
 155                 EGLint numConfigs;
 156                 EGLConfig config;
 157                 EGLSurface surface;
 158                 EGLContext context;
 159
 160                 EGLDisplay display = eglGetDisplay(mnit_native_display);
 161                 if ( display == EGL_NO_DISPLAY) {
 162                         PRINT_ERROR("Unable to eglGetDisplay");
 163                         return -1;
 164                 }
 165
 166                 if ( eglInitialize(display, 0, 0) == EGL_FALSE) {
 167                         PRINT_ERROR("Unable to eglInitialize");
 168                         return -1;
 169                 }
 170
 171                 if ( eglChooseConfig(display, attribs, &config, 1, &numConfigs) == EGL_FALSE) {
 172                         PRINT_ERROR("Unable to eglChooseConfig");
 173                         return -1;
 174                 }
 175
 176                 if ( numConfigs == 0 ) {
 177                         PRINT_ERROR("No configs available for egl");
 178                         return -1;
 179                 }
 180
 181                 if ( eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format) == EGL_FALSE) {
 182                         PRINT_ERROR("Unable to eglGetConfigAttrib");
 183                         return -1;
 184                 }
 185
 186                 /* Used by Android to set buffer geometry */
 187                 Opengles1Display_midway_init(recv, format);
 188
 189                 surface = eglCreateWindowSurface(display, config, mnit_window, NULL);
 190                 context = eglCreateContext(display, config, NULL, NULL);
 191
 192                 if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
 193                         PRINT_ERROR("Unable to eglMakeCurrent");
 194                         return -1;
 195                 }
 196
 197                 eglQuerySurface(display, surface, EGL_WIDTH, &w);
 198                 eglQuerySurface(display, surface, EGL_HEIGHT, &h);
 199
 200                 mnit_display = display;
 201                 mnit_context = context;
 202                 mnit_surface = surface;
 203                 mnit_config = config;
 204                 mnit_width = w;
 205                 mnit_height = h;
 206
 207                 glViewport(0, 0, mnit_width, mnit_height);
 208                 glMatrixMode(GL_PROJECTION);
 209                 glLoadIdentity();
 210                 glOrthof(0.0f, w, h, 0.0f, 0.0f, 1.0f);
 211                 glMatrixMode(GL_MODELVIEW);
 212
 213                 glFrontFace( GL_CW );
 214
 215                 return 0;
 216         `}
 217
 218         fun close is extern `{
 219                 if ( mnit_display != EGL_NO_DISPLAY) {
 220                         eglMakeCurrent( mnit_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 221                         if ( mnit_context != EGL_NO_CONTEXT) {
 222                                 eglDestroyContext( mnit_display,  mnit_context );
 223                         }
 224                         if ( mnit_surface != EGL_NO_SURFACE) {
 225                                 eglDestroySurface( mnit_display,  mnit_surface );
 226                         }
 227                         eglTerminate( mnit_display);
 228                 }
 229                  mnit_display = EGL_NO_DISPLAY;
 230                  mnit_context = EGL_NO_CONTEXT;
 231                  mnit_surface = EGL_NO_SURFACE;
 232         `}
 233
 234         redef fun begin is extern `{
 235                 glClear(GL_COLOR_BUFFER_BIT);
 236                 glLoadIdentity();
 237         `}
 238
 239         redef fun width: Int is extern `{
 240                 return mnit_width;
 241         `}
 242         redef fun height: Int is extern `{
 243                 return mnit_height;
 244         `}
 245
 246         redef fun finish is extern `{
 247                 eglSwapBuffers( mnit_display, mnit_surface );
 248         `}
 249
 250         redef fun set_viewport( x, y, w, h ) is extern `{
 251                 glLoadIdentity();
 252                 glViewport(0,0, mnit_width, mnit_height );
 253                 glMatrixMode(GL_PROJECTION);
 254                 glLoadIdentity();
 255                 glOrthof(x, x+w, y+h, y, 0.0f, 1.0f);
 256                 glMatrixMode(GL_MODELVIEW);
 257                 glFrontFace( GL_CW );
 258         `}
 259
 260         redef fun blit(image, x, y) do native_blit(image, x.to_f, y.to_f)
 261
 262         private fun native_blit(image: Opengles1Image, x, y: Float)  `{
 263                 GLfloat texture_coord[4][2] =
 264                 {
 265                         {image->src_xo, image->src_yi},
 266                         {image->src_xi, image->src_yi},
 267                         {image->src_xo, image->src_yo},
 268                         {image->src_xi, image->src_yo}
 269                 };
 270
 271                 glLoadIdentity();
 272
 273                 glBindTexture(GL_TEXTURE_2D, image->texture);
 274
 275                 glEnableClientState(GL_VERTEX_ARRAY);
 276                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 277                 glTranslatef( x, y, 0.0f );
 278                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 279
 280                 if ( image->blended ) {
 281                         glEnable(GL_BLEND);
 282                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 283                 }
 284
 285                 glEnable(GL_TEXTURE_2D);
 286                 glDisable(GL_DEPTH_TEST);
 287
 288                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 289                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 290
 291                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 292
 293                 glDisableClientState(GL_VERTEX_ARRAY);
 294                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 295                 if ( image->blended ) glDisable(GL_BLEND);
 296                 glDisable(GL_TEXTURE_2D);
 297
 298                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 299                    PRINT_ERROR("error drawing: %i", mnit_opengles_error_code);
 300                 }
 301         `}
 302
 303     redef fun blit_centered(img, x, y)
 304     do
 305                 x = x.sub(img.center_x)
 306                 y = y.sub(img.center_y)
 307                 blit(img, x, y)
 308     end
 309
 310         redef fun blit_rotated(image, x, y, angle) do native_blit_rotated(image, x.to_f, y.to_f, angle)
 311
 312         private fun native_blit_rotated(image: Opengles1Image, x, y, angle: Float) `{
 313                 GLfloat texture_coord[4][2] =
 314                 {
 315                         {image->src_xo, image->src_yi},
 316                         {image->src_xi, image->src_yi},
 317                         {image->src_xo, image->src_yo},
 318                         {image->src_xi, image->src_yo}
 319                 };
 320
 321                 glLoadIdentity();
 322
 323                 glBindTexture(GL_TEXTURE_2D, image->texture);
 324
 325                 glEnableClientState(GL_VERTEX_ARRAY);
 326                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 327                 glTranslatef( x, y, 0.0f );
 328                 glRotatef( angle*180.0f/3.14156f, 0, 0, 1.0f );
 329                 glTranslatef( image->width*image->scale/-2, image->height*image->scale/-2, 0.0f );
 330                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 331                 if ( image->blended ) {
 332                         glEnable(GL_BLEND);
 333                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 334                 }
 335                 glEnable(GL_TEXTURE_2D);
 336                 glDisable(GL_DEPTH_TEST);
 337
 338                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 339                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 340
 341                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 342
 343                 glDisableClientState(GL_VERTEX_ARRAY);
 344                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 345                 if ( image->blended ) glDisable(GL_BLEND);
 346                 glDisable(GL_TEXTURE_2D);
 347
 348                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 349                    PRINT_ERROR("error drawing: %i", mnit_opengles_error_code);
 350                 }
 351         `}
 352
 353         # a = top left, b = bottom left, c = bottom right, d = top right
 354         redef fun blit_stretched(image, ax, ay, bx, by, cx, cy, dx, dy)
 355         do
 356                 native_blit_stretched(image,
 357                         ax.to_f, ay.to_f, bx.to_f, by.to_f,
 358                         cx.to_f, cy.to_f, dx.to_f, dy.to_f)
 359         end
 360
 361         private fun native_blit_stretched(image: I, ax, ay, bx, by, cx, cy, dx, dy: Float) `{
 362                 GLfloat texture_coord[4][2] =
 363                 {
 364                         {image->src_xo, image->src_yi},
 365                         {image->src_xi, image->src_yi},
 366                         {image->src_xo, image->src_yo},
 367                         {image->src_xi, image->src_yo}
 368                 };
 369
 370                 GLfloat mnit_opengles_vertices_stretched[6][3] =
 371                 {
 372                         {bx, by, 0.0f},
 373                         {cx, cy, 0.0f},
 374                         {ax, ay, 0.0f},
 375                         {dx, dy, 0.0f},
 376                 };
 377
 378                 glLoadIdentity();
 379
 380                 glBindTexture(GL_TEXTURE_2D, image->texture);
 381
 382                 glEnableClientState(GL_VERTEX_ARRAY);
 383                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 384
 385                 if ( image->blended ) {
 386                         glEnable(GL_BLEND);
 387                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 388                 }
 389
 390                 glEnable(GL_TEXTURE_2D);
 391                 glDisable(GL_DEPTH_TEST);
 392
 393                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices_stretched);
 394                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 395
 396                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 397
 398                 glDisableClientState(GL_VERTEX_ARRAY);
 399                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 400                 if ( image->blended ) glDisable(GL_BLEND);
 401                 glDisable(GL_TEXTURE_2D);
 402
 403                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 404                    PRINT_ERROR("error drawing: %i", mnit_opengles_error_code);
 405                 }
 406         `}
 407
 408         redef fun clear( r, g, b: Float ) is extern `{
 409                 glClearColor( r, g, b, 1.0 );
 410                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 411         `}
 412
 413         fun clear_alpha( r, g, b, a: Float ) is extern `{
 414                 glClearColor( r, g, b, a );
 415                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 416         `}
 417
 418         # Set the current color applied to all drawing
 419         #
 420         # require: r, g, b, a in [0.0 .. 1.0]
 421         fun color(r, g, b, a: Float) `{ glColor4f(r, g, b, a); `}
 422
 423         # Reset the current color to opaque white
 424         fun reset_color `{ glColor4f(1.0f, 1.0f, 1.0f, 1.0f); `}
 425 end
 426
 427 extern class Opengles1Image in "C" `{struct mnit_opengles_Texture *`}
 428         super Image
 429
 430     redef fun destroy is extern `{ free( recv ); `}
 431
 432     redef fun width: Int is extern `{ return recv->width; `}
 433     redef fun height: Int is extern `{ return recv->height; `}
 434
 435         fun center_x: Int `{ return recv->center_x; `}
 436         fun center_y: Int `{ return recv->center_y; `}
 437
 438     redef fun scale=( v: Float ) is extern `{
 439                 recv->scale = v;
 440                 recv->center_x = v*recv->width/2;
 441                 recv->center_y = v*recv->height/2;
 442     `}
 443     redef fun scale: Float is extern `{ return recv->scale; `}
 444
 445     redef fun blended=( v: Bool ) is extern `{ recv->blended = v; `}
 446     redef fun blended: Bool is extern `{ return recv->blended; `}
 447
 448     # inherits scale and blend from source
 449     redef fun subimage( x, y, w, h: Int ): Image is extern import Opengles1Image.as( Image ) `{
 450                 struct mnit_opengles_Texture* image =
 451                         malloc( sizeof( struct mnit_opengles_Texture ) );
 452
 453                 image->texture = recv->texture;
 454                 image->width = w;
 455                 image->height = h;
 456                 image->center_x = recv->scale*w/2;
 457                 image->center_y = recv->scale*h/2;
 458                 image->scale = recv->scale;
 459                 image->blended = recv->blended;
 460
 461                 float r_dx = recv->src_xi - recv->src_xo;
 462                 float r_dy = recv->src_yi - recv->src_yo;
 463                 image->src_xo = recv->src_xo + ((float)x)/recv->width*r_dx;
 464                 image->src_yo = recv->src_yo + ((float)y)/recv->height*r_dy;
 465                 image->src_xi = recv->src_xo + ((float)x+w)/recv->width*r_dx;
 466                 image->src_yi = recv->src_yo + ((float)y+h)/recv->height*r_dy;
 467
 468                 return Opengles1Image_as_Image( image );
 469     `}
 470 end