src/mesa/drivers/fbdev/glfbdev.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * OpenGL (Mesa) interface for fbdev.
  28  * For info about fbdev:
  29  * http://www.tldp.org/HOWTO/Framebuffer-HOWTO.html
  30  *
  31  * known VGA modes
  32  * Colours   640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
  33  * --------+--------------------------------------------------------------
  34  *  4 bits |    ?       ?     0x302      ?        ?        ?         ?
  35  *  8 bits |  0x300   0x301   0x303    0x305    0x161    0x307     0x31C
  36  * 15 bits |    ?     0x310   0x313    0x316    0x162    0x319     0x31D
  37  * 16 bits |    ?     0x311   0x314    0x317    0x163    0x31A     0x31E
  38  * 24 bits |    ?     0x312   0x315    0x318      ?      0x31B     0x31F
  39  * 32 bits |    ?       ?       ?        ?      0x164      ?
  40  */
  41
  42 #ifdef USE_GLFBDEV_DRIVER
  43
  44 #include "glheader.h"
  45 #include <linux/fb.h>
  46 #include "GL/glfbdev.h"
  47 #include "buffers.h"
  48 #include "context.h"
  49 #include "extensions.h"
  50 #include "fbobject.h"
  51 #include "framebuffer.h"
  52 #include "imports.h"
  53 #include "renderbuffer.h"
  54 #include "texformat.h"
  55 #include "teximage.h"
  56 #include "texstore.h"
  57 #include "array_cache/acache.h"
  58 #include "swrast/swrast.h"
  59 #include "swrast_setup/swrast_setup.h"
  60 #include "tnl/tnl.h"
  61 #include "tnl/t_context.h"
  62 #include "tnl/t_pipeline.h"
  63 #include "drivers/common/driverfuncs.h"
  64
  65
  66 #define PF_B8G8R8     1
  67 #define PF_B8G8R8A8   2
  68 #define PF_B5G6R5     3
  69 #define PF_B5G5R5     4
  70 #define PF_CI8        5
  71
  72
  73 /*
  74  * Derived from Mesa's GLvisual class.
  75  */
  76 struct GLFBDevVisualRec {
  77    GLvisual glvisual;              /* base class */
  78    struct fb_fix_screeninfo fix;
  79    struct fb_var_screeninfo var;
  80    int pixelFormat;
  81 };
  82
  83 /*
  84  * Derived from Mesa's GLframebuffer class.
  85  */
  86 struct GLFBDevBufferRec {
  87    GLframebuffer glframebuffer;    /* base class */
  88    GLFBDevVisualPtr visual;
  89    struct fb_fix_screeninfo fix;
  90    struct fb_var_screeninfo var;
  91    size_t size;                    /* color buffer size in bytes */
  92    GLuint bytesPerPixel;
  93 };
  94
  95 /*
  96  * Derived from Mesa's GLcontext class.
  97  */
  98 struct GLFBDevContextRec {
  99    GLcontext glcontext;            /* base class */
 100    GLFBDevVisualPtr visual;
 101    GLFBDevBufferPtr drawBuffer;
 102    GLFBDevBufferPtr readBuffer;
 103    GLFBDevBufferPtr curBuffer;
 104 };
 105
 106 /*
 107  * Derived from Mesa's gl_renderbuffer class.
 108  */
 109 struct GLFBDevRenderbufferRec {
 110    struct gl_renderbuffer Base;
 111    GLubyte *bottom;                /* pointer to last row */
 112    GLuint rowStride;               /* in bytes */
 113    GLboolean mallocedBuffer;
 114 };
 115
 116
 117
 118 #define GLFBDEV_CONTEXT(CTX)  ((GLFBDevContextPtr) (CTX))
 119 #define GLFBDEV_BUFFER(BUF)  ((GLFBDevBufferPtr) (BUF))
 120
 121
 122 /**********************************************************************/
 123 /* Internal device driver functions                                   */
 124 /**********************************************************************/
 125
 126
 127 static const GLubyte *
 128 get_string(GLcontext *ctx, GLenum pname)
 129 {
 130    (void) ctx;
 131    switch (pname) {
 132       case GL_RENDERER:
 133          return (const GLubyte *) "Mesa glfbdev";
 134       default:
 135          return NULL;
 136    }
 137 }
 138
 139
 140 static void
 141 update_state( GLcontext *ctx, GLuint new_state )
 142 {
 143    /* not much to do here - pass it on */
 144    _swrast_InvalidateState( ctx, new_state );
 145    _swsetup_InvalidateState( ctx, new_state );
 146    _ac_InvalidateState( ctx, new_state );
 147    _tnl_InvalidateState( ctx, new_state );
 148 }
 149
 150
 151 static void
 152 get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 153 {
 154    const GLFBDevBufferPtr fbdevbuffer = GLFBDEV_BUFFER(buffer);
 155    *width = fbdevbuffer->var.xres_virtual;
 156    *height = fbdevbuffer->var.yres_virtual;
 157 }
 158
 159
 160 static void
 161 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 162 {
 163    /* poll for window size change and realloc software Z/stencil/etc if needed */
 164    _mesa_ResizeBuffersMESA();
 165 }
 166
 167
 168 /*
 169  * Generate code for span functions.
 170  */
 171
 172 /* 24-bit BGR */
 173 #define NAME(PREFIX) PREFIX##_B8G8R8
 174 #define RB_TYPE GLubyte
 175 #define SPAN_VARS \
 176    struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
 177 #define INIT_PIXEL_PTR(P, X, Y) \
 178    GLubyte *P = frb->bottom - (Y) * frb->rowStride + (X) * 3
 179 #define INC_PIXEL_PTR(P) P += 3
 180 #define STORE_PIXEL(DST, X, Y, VALUE) \
 181    DST[0] = VALUE[BCOMP];  \
 182    DST[1] = VALUE[GCOMP];  \
 183    DST[2] = VALUE[RCOMP]
 184 #define FETCH_PIXEL(DST, SRC) \
 185    DST[RCOMP] = SRC[2];  \
 186    DST[GCOMP] = SRC[1];  \
 187    DST[BCOMP] = SRC[0];  \
 188    DST[ACOMP] = CHAN_MAX
 189
 190 #include "swrast/s_spantemp.h"
 191
 192
 193 /* 32-bit BGRA */
 194 #define NAME(PREFIX) PREFIX##_B8G8R8A8
 195 #define RB_TYPE GLubyte
 196 #define SPAN_VARS \
 197    struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
 198 #define INIT_PIXEL_PTR(P, X, Y) \
 199    GLubyte *P = frb->bottom - (Y) * frb->rowStride + (X) * 4
 200 #define INC_PIXEL_PTR(P) P += 4
 201 #define STORE_PIXEL(DST, X, Y, VALUE) \
 202    DST[0] = VALUE[BCOMP];  \
 203    DST[1] = VALUE[GCOMP];  \
 204    DST[2] = VALUE[RCOMP];  \
 205    DST[3] = VALUE[ACOMP]
 206 #define FETCH_PIXEL(DST, SRC) \
 207    DST[RCOMP] = SRC[2];  \
 208    DST[GCOMP] = SRC[1];  \
 209    DST[BCOMP] = SRC[0];  \
 210    DST[ACOMP] = SRC[3]
 211
 212 #include "swrast/s_spantemp.h"
 213
 214
 215 /* 16-bit BGR (XXX implement dithering someday) */
 216 #define NAME(PREFIX) PREFIX##_B5G6R5
 217 #define RB_TYPE GLubyte
 218 #define SPAN_VARS \
 219    struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
 220 #define INIT_PIXEL_PTR(P, X, Y) \
 221    GLushort *P = (GLushort *) (frb->bottom - (Y) * frb->rowStride + (X) * 2)
 222 #define INC_PIXEL_PTR(P) P += 1
 223 #define STORE_PIXEL(DST, X, Y, VALUE) \
 224    DST[0] = ( (((VALUE[RCOMP]) & 0xf8) << 8) | (((VALUE[GCOMP]) & 0xfc) << 3) | ((VALUE[BCOMP]) >> 3) )
 225 #define FETCH_PIXEL(DST, SRC) \
 226    DST[RCOMP] = ( (((SRC[0]) >> 8) & 0xf8) | (((SRC[0]) >> 11) & 0x7) ); \
 227    DST[GCOMP] = ( (((SRC[0]) >> 3) & 0xfc) | (((SRC[0]) >>  5) & 0x3) ); \
 228    DST[BCOMP] = ( (((SRC[0]) << 3) & 0xf8) | (((SRC[0])      ) & 0x7) ); \
 229    DST[ACOMP] = CHAN_MAX
 230
 231 #include "swrast/s_spantemp.h"
 232
 233
 234 /* 15-bit BGR (XXX implement dithering someday) */
 235 #define NAME(PREFIX) PREFIX##_B5G5R5
 236 #define RB_TYPE GLubyte
 237 #define SPAN_VARS \
 238    struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
 239 #define INIT_PIXEL_PTR(P, X, Y) \
 240    GLushort *P = (GLushort *) (frb->bottom - (Y) * frb->rowStride + (X) * 2)
 241 #define INC_PIXEL_PTR(P) P += 1
 242 #define STORE_PIXEL(DST, X, Y, VALUE) \
 243    DST[0] = ( (((VALUE[RCOMP]) & 0xf8) << 7) | (((VALUE[GCOMP]) & 0xf8) << 2) | ((VALUE[BCOMP]) >> 3) )
 244 #define FETCH_PIXEL(DST, SRC) \
 245    DST[RCOMP] = ( (((SRC[0]) >> 7) & 0xf8) | (((SRC[0]) >> 10) & 0x7) ); \
 246    DST[GCOMP] = ( (((SRC[0]) >> 2) & 0xf8) | (((SRC[0]) >>  5) & 0x7) ); \
 247    DST[BCOMP] = ( (((SRC[0]) << 3) & 0xf8) | (((SRC[0])      ) & 0x7) ); \
 248    DST[ACOMP] = CHAN_MAX
 249
 250 #include "swrast/s_spantemp.h"
 251
 252
 253 /* 8-bit color index */
 254 #define NAME(PREFIX) PREFIX##_CI8
 255 #define CI_MODE
 256 #define RB_TYPE GLubyte
 257 #define SPAN_VARS \
 258    struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
 259 #define INIT_PIXEL_PTR(P, X, Y) \
 260    GLubyte *P = frb->bottom - (Y) * frb->rowStride + (X)
 261 #define INC_PIXEL_PTR(P) P += 1
 262 #define STORE_PIXEL(DST, X, Y, VALUE) \
 263    *DST = VALUE[0]
 264 #define FETCH_PIXEL(DST, SRC) \
 265    DST = SRC[0]
 266
 267 #include "swrast/s_spantemp.h"
 268
 269
 270
 271
 272 /**********************************************************************/
 273 /* Public API functions                                               */
 274 /**********************************************************************/
 275
 276
 277 const char *
 278 glFBDevGetString( int str )
 279 {
 280    switch (str) {
 281    case GLFBDEV_VENDOR:
 282       return "Mesa Project";
 283    case GLFBDEV_VERSION:
 284       return "1.0.0";
 285    default:
 286       return NULL;
 287    }
 288 }
 289
 290
 291 GLFBDevProc
 292 glFBDevGetProcAddress( const char *procName )
 293 {
 294    struct name_address {
 295       const char *name;
 296       const GLFBDevProc func;
 297    };
 298    static const struct name_address functions[] = {
 299       { "glFBDevGetString", (GLFBDevProc) glFBDevGetString },
 300       { "glFBDevGetProcAddress", (GLFBDevProc) glFBDevGetProcAddress },
 301       { "glFBDevCreateVisual", (GLFBDevProc) glFBDevCreateVisual },
 302       { "glFBDevDestroyVisual", (GLFBDevProc) glFBDevDestroyVisual },
 303       { "glFBDevGetVisualAttrib", (GLFBDevProc) glFBDevGetVisualAttrib },
 304       { "glFBDevCreateBuffer", (GLFBDevProc) glFBDevCreateBuffer },
 305       { "glFBDevDestroyBuffer", (GLFBDevProc) glFBDevDestroyBuffer },
 306       { "glFBDevGetBufferAttrib", (GLFBDevProc) glFBDevGetBufferAttrib },
 307       { "glFBDevGetCurrentDrawBuffer", (GLFBDevProc) glFBDevGetCurrentDrawBuffer },
 308       { "glFBDevGetCurrentReadBuffer", (GLFBDevProc) glFBDevGetCurrentReadBuffer },
 309       { "glFBDevSwapBuffers", (GLFBDevProc) glFBDevSwapBuffers },
 310       { "glFBDevCreateContext", (GLFBDevProc) glFBDevCreateContext },
 311       { "glFBDevDestroyContext", (GLFBDevProc) glFBDevDestroyContext },
 312       { "glFBDevGetContextAttrib", (GLFBDevProc) glFBDevGetContextAttrib },
 313       { "glFBDevGetCurrentContext", (GLFBDevProc) glFBDevGetCurrentContext },
 314       { "glFBDevMakeCurrent", (GLFBDevProc) glFBDevMakeCurrent },
 315       { NULL, NULL }
 316    };
 317    const struct name_address *entry;
 318    for (entry = functions; entry->name; entry++) {
 319       if (_mesa_strcmp(entry->name, procName) == 0) {
 320          return entry->func;
 321       }
 322    }
 323    return _glapi_get_proc_address(procName);
 324 }
 325
 326
 327 GLFBDevVisualPtr
 328 glFBDevCreateVisual( const struct fb_fix_screeninfo *fixInfo,
 329                      const struct fb_var_screeninfo *varInfo,
 330                      const int *attribs )
 331 {
 332    GLFBDevVisualPtr vis;
 333    const int *attrib;
 334    GLboolean rgbFlag = GL_TRUE, dbFlag = GL_FALSE, stereoFlag = GL_FALSE;
 335    GLint redBits = 0, greenBits = 0, blueBits = 0, alphaBits = 0;
 336    GLint indexBits = 0, depthBits = 0, stencilBits = 0;
 337    GLint accumRedBits = 0, accumGreenBits = 0;
 338    GLint accumBlueBits = 0, accumAlphaBits = 0;
 339    GLint numSamples = 0;
 340
 341    ASSERT(fixInfo);
 342    ASSERT(varInfo);
 343
 344    vis = CALLOC_STRUCT(GLFBDevVisualRec);
 345    if (!vis)
 346       return NULL;
 347
 348    vis->fix = *fixInfo;  /* struct assignment */
 349    vis->var = *varInfo;  /* struct assignment */
 350
 351    for (attrib = attribs; attrib && *attrib != GLFBDEV_NONE; attrib++) {
 352       switch (*attrib) {
 353       case GLFBDEV_DOUBLE_BUFFER:
 354          dbFlag = GL_TRUE;
 355          break;
 356       case GLFBDEV_COLOR_INDEX:
 357          rgbFlag = GL_FALSE;
 358          break;
 359       case GLFBDEV_DEPTH_SIZE:
 360          depthBits = attrib[1];
 361          attrib++;
 362          break;
 363       case GLFBDEV_STENCIL_SIZE:
 364          stencilBits = attrib[1];
 365          attrib++;
 366          break;
 367       case GLFBDEV_ACCUM_SIZE:
 368          accumRedBits = accumGreenBits = accumBlueBits = accumAlphaBits
 369             = attrib[1];
 370          attrib++;
 371          break;
 372       case GLFBDEV_LEVEL:
 373          /* ignored for now */
 374          break;
 375       default:
 376          /* unexpected token */
 377          _mesa_free(vis);
 378          return NULL;
 379       }
 380    }
 381
 382    if (rgbFlag) {
 383       redBits   = varInfo->red.length;
 384       greenBits = varInfo->green.length;
 385       blueBits  = varInfo->blue.length;
 386       alphaBits = varInfo->transp.length;
 387
 388       if ((fixInfo->visual == FB_VISUAL_TRUECOLOR ||
 389            fixInfo->visual == FB_VISUAL_DIRECTCOLOR)
 390           && varInfo->bits_per_pixel == 24
 391           && varInfo->red.offset == 16
 392           && varInfo->green.offset == 8
 393           && varInfo->blue.offset == 0) {
 394          vis->pixelFormat = PF_B8G8R8;
 395       }
 396       else if ((fixInfo->visual == FB_VISUAL_TRUECOLOR ||
 397                 fixInfo->visual == FB_VISUAL_DIRECTCOLOR)
 398                && varInfo->bits_per_pixel == 32
 399                && varInfo->red.offset == 16
 400                && varInfo->green.offset == 8
 401                && varInfo->blue.offset == 0
 402                && varInfo->transp.offset == 24) {
 403          vis->pixelFormat = PF_B8G8R8A8;
 404       }
 405       else if ((fixInfo->visual == FB_VISUAL_TRUECOLOR ||
 406                 fixInfo->visual == FB_VISUAL_DIRECTCOLOR)
 407                && varInfo->bits_per_pixel == 16
 408                && varInfo->red.offset == 11
 409                && varInfo->green.offset == 5
 410                && varInfo->blue.offset == 0) {
 411          vis->pixelFormat = PF_B5G6R5;
 412       }
 413       else if ((fixInfo->visual == FB_VISUAL_TRUECOLOR ||
 414                 fixInfo->visual == FB_VISUAL_DIRECTCOLOR)
 415                && varInfo->bits_per_pixel == 16
 416                && varInfo->red.offset == 10
 417                && varInfo->green.offset == 5
 418                && varInfo->blue.offset == 0) {
 419          vis->pixelFormat = PF_B5G5R5;
 420       }
 421       else {
 422          _mesa_problem(NULL, "Unsupported fbdev RGB visual/bitdepth!\n");
 423          /*
 424          printf("fixInfo->visual = 0x%x\n", fixInfo->visual);
 425          printf("varInfo->bits_per_pixel = %d\n", varInfo->bits_per_pixel);
 426          printf("varInfo->red.offset = %d\n", varInfo->red.offset);
 427          printf("varInfo->green.offset = %d\n", varInfo->green.offset);
 428          printf("varInfo->blue.offset = %d\n", varInfo->blue.offset);
 429          */
 430          _mesa_free(vis);
 431          return NULL;
 432       }
 433    }
 434    else {
 435       indexBits = varInfo->bits_per_pixel;
 436       if ((fixInfo->visual == FB_VISUAL_PSEUDOCOLOR ||
 437            fixInfo->visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 438           && varInfo->bits_per_pixel == 8) {
 439          vis->pixelFormat = PF_CI8;
 440       }
 441       else {
 442          _mesa_problem(NULL, "Unsupported fbdev CI visual/bitdepth!\n");
 443          _mesa_free(vis);
 444          return NULL;
 445       }
 446    }
 447
 448    if (!_mesa_initialize_visual(&vis->glvisual, rgbFlag, dbFlag, stereoFlag,
 449                                 redBits, greenBits, blueBits, alphaBits,
 450                                 indexBits, depthBits, stencilBits,
 451                                 accumRedBits, accumGreenBits,
 452                                 accumBlueBits, accumAlphaBits,
 453                                 numSamples)) {
 454       /* something was invalid */
 455       _mesa_free(vis);
 456       return NULL;
 457    }
 458
 459    return vis;
 460 }
 461
 462
 463 void
 464 glFBDevDestroyVisual( GLFBDevVisualPtr visual )
 465 {
 466    if (visual)
 467       _mesa_free(visual);
 468 }
 469
 470
 471 int
 472 glFBDevGetVisualAttrib( const GLFBDevVisualPtr visual, int attrib)
 473 {
 474    /* XXX unfinished */
 475    (void) visual;
 476    (void) attrib;
 477    return -1;
 478 }
 479
 480
 481 static void
 482 delete_renderbuffer(struct gl_renderbuffer *rb)
 483 {
 484    struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
 485    if (frb->mallocedBuffer) {
 486       _mesa_free(frb->Base.Data);
 487    }
 488    _mesa_free(frb);
 489 }
 490
 491
 492 static GLboolean
 493 renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 494                      GLenum internalFormat, GLuint width, GLuint height)
 495 {
 496    /* no-op: the renderbuffer storage is allocated just once when it's
 497     * created.  Never resized or reallocated.
 498     */
 499    return GL_TRUE;
 500 }
 501
 502
 503 static struct GLFBDevRenderbufferRec *
 504 new_glfbdev_renderbuffer(void *bufferStart, int pixelFormat)
 505 {
 506    struct GLFBDevRenderbufferRec *rb = CALLOC_STRUCT(GLFBDevRenderbufferRec);
 507    if (rb) {
 508       GLuint name = 0;
 509       _mesa_init_renderbuffer(&rb->Base, name);
 510
 511       rb->Base.Delete = delete_renderbuffer;
 512       rb->Base.AllocStorage = renderbuffer_storage;
 513
 514       if (pixelFormat == PF_B8G8R8) {
 515          rb->Base.GetRow = get_row_B8G8R8;
 516          rb->Base.GetValues = get_values_B8G8R8;
 517          rb->Base.PutRow = put_row_B8G8R8;
 518          rb->Base.PutRowRGB = put_row_rgb_B8G8R8;
 519          rb->Base.PutMonoRow = put_mono_row_B8G8R8;
 520          rb->Base.PutValues = put_values_B8G8R8;
 521          rb->Base.PutMonoValues = put_mono_values_B8G8R8;
 522       }
 523       else if (pixelFormat == PF_B8G8R8A8) {
 524          rb->Base.GetRow = get_row_B8G8R8A8;
 525          rb->Base.GetValues = get_values_B8G8R8A8;
 526          rb->Base.PutRow = put_row_B8G8R8A8;
 527          rb->Base.PutRowRGB = put_row_rgb_B8G8R8A8;
 528          rb->Base.PutMonoRow = put_mono_row_B8G8R8A8;
 529          rb->Base.PutValues = put_values_B8G8R8A8;
 530          rb->Base.PutMonoValues = put_mono_values_B8G8R8A8;
 531       }
 532       else if (pixelFormat == PF_B5G6R5) {
 533          rb->Base.GetRow = get_row_B5G6R5;
 534          rb->Base.GetValues = get_values_B5G6R5;
 535          rb->Base.PutRow = put_row_B5G6R5;
 536          rb->Base.PutRowRGB = put_row_rgb_B5G6R5;
 537          rb->Base.PutMonoRow = put_mono_row_B5G6R5;
 538          rb->Base.PutValues = put_values_B5G6R5;
 539          rb->Base.PutMonoValues = put_mono_values_B5G6R5;
 540       }
 541       else if (pixelFormat == PF_B5G5R5) {
 542          rb->Base.GetRow = get_row_B5G5R5;
 543          rb->Base.GetValues = get_values_B5G5R5;
 544          rb->Base.PutRow = put_row_B5G5R5;
 545          rb->Base.PutRowRGB = put_row_rgb_B5G5R5;
 546          rb->Base.PutMonoRow = put_mono_row_B5G5R5;
 547          rb->Base.PutValues = put_values_B5G5R5;
 548          rb->Base.PutMonoValues = put_mono_values_B5G5R5;
 549       }
 550       else if (pixelFormat == PF_CI8) {
 551          rb->Base.GetRow = get_row_CI8;
 552          rb->Base.GetValues = get_values_CI8;
 553          rb->Base.PutRow = put_row_CI8;
 554          rb->Base.PutMonoRow = put_mono_row_CI8;
 555          rb->Base.PutValues = put_values_CI8;
 556          rb->Base.PutMonoValues = put_mono_values_CI8;
 557       }
 558
 559       if (pixelFormat == PF_CI8) {
 560          rb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 561          rb->Base._BaseFormat = GL_COLOR_INDEX;
 562       }
 563       else {
 564          rb->Base.InternalFormat = GL_RGBA;
 565          rb->Base._BaseFormat = GL_RGBA;
 566       }
 567       rb->Base.DataType = GL_UNSIGNED_BYTE;
 568       rb->Base.Data = bufferStart;
 569    }
 570    return rb;
 571 }
 572
 573
 574 GLFBDevBufferPtr
 575 glFBDevCreateBuffer( const struct fb_fix_screeninfo *fixInfo,
 576                      const struct fb_var_screeninfo *varInfo,
 577                      const GLFBDevVisualPtr visual,
 578                      void *frontBuffer, void *backBuffer, size_t size )
 579 {
 580    struct GLFBDevRenderbufferRec *frontrb, *backrb;
 581    GLFBDevBufferPtr buf;
 582
 583    ASSERT(visual);
 584    ASSERT(frontBuffer);
 585    ASSERT(size > 0);
 586
 587    if (visual->fix.visual != fixInfo->visual ||
 588        visual->fix.type != fixInfo->type ||
 589        visual->var.bits_per_pixel != varInfo->bits_per_pixel ||
 590        visual->var.grayscale != varInfo->grayscale ||
 591        visual->var.red.offset != varInfo->red.offset ||
 592        visual->var.green.offset != varInfo->green.offset ||
 593        visual->var.blue.offset != varInfo->blue.offset ||
 594        visual->var.transp.offset != varInfo->transp.offset) {
 595       /* visual mismatch! */
 596       return NULL;
 597    }
 598
 599    buf = CALLOC_STRUCT(GLFBDevBufferRec);
 600    if (!buf)
 601       return NULL;
 602
 603    /* basic framebuffer setup */
 604    _mesa_initialize_framebuffer(&buf->glframebuffer, &visual->glvisual);
 605    /* add front renderbuffer */
 606    frontrb = new_glfbdev_renderbuffer(frontBuffer, visual->pixelFormat);
 607    _mesa_add_renderbuffer(&buf->glframebuffer, BUFFER_FRONT_LEFT,
 608                           &frontrb->Base);
 609    /* add back renderbuffer */
 610    if (visual->glvisual.doubleBufferMode) {
 611       backrb = new_glfbdev_renderbuffer(backBuffer, visual->pixelFormat);
 612       _mesa_add_renderbuffer(&buf->glframebuffer, BUFFER_BACK_LEFT,
 613                              &backrb->Base);
 614    }
 615    /* add software renderbuffers */
 616    _mesa_add_soft_renderbuffers(&buf->glframebuffer,
 617                                 GL_FALSE, /* color */
 618                                 visual->glvisual.haveDepthBuffer,
 619                                 visual->glvisual.haveStencilBuffer,
 620                                 visual->glvisual.haveAccumBuffer,
 621                                 GL_FALSE, /* alpha */
 622                                 GL_FALSE /* aux bufs */);
 623
 624
 625
 626    buf->fix = *fixInfo;   /* struct assignment */
 627    buf->var = *varInfo;   /* struct assignment */
 628    buf->visual = visual;  /* ptr assignment */
 629    buf->size = size;
 630    buf->bytesPerPixel = visual->var.bits_per_pixel / 8;
 631    frontrb->rowStride = visual->var.xres_virtual * buf->bytesPerPixel;
 632    frontrb->bottom = (GLubyte *) frontrb->Base.Data
 633       + (visual->var.yres_virtual - 1) * frontrb->rowStride;
 634
 635    if (visual->glvisual.doubleBufferMode) {
 636       if (!backBuffer) {
 637          /* malloc a back buffer */
 638          backrb->Base.Data = _mesa_malloc(size);
 639          if (!backrb->Base.Data) {
 640             _mesa_free_framebuffer_data(&buf->glframebuffer);
 641             _mesa_free(buf);
 642             return NULL;
 643          }
 644          backrb->mallocedBuffer = GL_TRUE;
 645       }
 646       backrb->rowStride = frontrb->rowStride;
 647       backrb->bottom = (GLubyte *) backrb->Base.Data
 648          + (visual->var.yres_virtual - 1) * backrb->rowStride;
 649    }
 650    else {
 651       backrb->bottom = NULL;
 652       backrb->rowStride = 0;
 653    }
 654
 655    return buf;
 656 }
 657
 658
 659 void
 660 glFBDevDestroyBuffer( GLFBDevBufferPtr buffer )
 661 {
 662    if (buffer) {
 663       /* check if destroying the current buffer */
 664       GLFBDevBufferPtr curDraw = glFBDevGetCurrentDrawBuffer();
 665       GLFBDevBufferPtr curRead = glFBDevGetCurrentReadBuffer();
 666       if (buffer == curDraw || buffer == curRead) {
 667          glFBDevMakeCurrent( NULL, NULL, NULL);
 668       }
 669       /* free the software depth, stencil, accum buffers */
 670       _mesa_free_framebuffer_data(&buffer->glframebuffer);
 671       _mesa_free(buffer);
 672    }
 673 }
 674
 675
 676 int
 677 glFBDevGetBufferAttrib( const GLFBDevBufferPtr buffer, int attrib)
 678 {
 679    (void) buffer;
 680    (void) attrib;
 681    return -1;
 682 }
 683
 684
 685 GLFBDevBufferPtr
 686 glFBDevGetCurrentDrawBuffer( void )
 687 {
 688    GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
 689    if (fbdevctx)
 690       return fbdevctx->drawBuffer;
 691    else
 692       return NULL;
 693 }
 694
 695
 696 GLFBDevBufferPtr
 697 glFBDevGetCurrentReadBuffer( void )
 698 {
 699    GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
 700    if (fbdevctx)
 701       return fbdevctx->readBuffer;
 702    else
 703       return NULL;
 704 }
 705
 706
 707 void
 708 glFBDevSwapBuffers( GLFBDevBufferPtr buffer )
 709 {
 710    GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
 711    struct GLFBDevRenderbufferRec *frontrb = (struct GLFBDevRenderbufferRec *)
 712       buffer->glframebuffer.Attachment[BUFFER_FRONT_LEFT].Renderbuffer;
 713    struct GLFBDevRenderbufferRec *backrb = (struct GLFBDevRenderbufferRec *)
 714       buffer->glframebuffer.Attachment[BUFFER_BACK_LEFT].Renderbuffer;
 715
 716    if (!buffer || !buffer->visual->glvisual.doubleBufferMode)
 717       return;
 718
 719    /* check if swapping currently bound buffer */
 720    if (fbdevctx->drawBuffer == buffer) {
 721       /* flush pending rendering */
 722       _mesa_notifySwapBuffers(&fbdevctx->glcontext);
 723    }
 724
 725    ASSERT(frontrb->Base.Data);
 726    ASSERT(backrb->Base.Data);
 727    _mesa_memcpy(frontrb->Base.Data, backrb->Base.Data, buffer->size);
 728 }
 729
 730
 731 GLFBDevContextPtr
 732 glFBDevCreateContext( const GLFBDevVisualPtr visual, GLFBDevContextPtr share )
 733 {
 734    GLFBDevContextPtr ctx;
 735    GLcontext *glctx;
 736    struct dd_function_table functions;
 737
 738    ASSERT(visual);
 739
 740    ctx = CALLOC_STRUCT(GLFBDevContextRec);
 741    if (!ctx)
 742       return NULL;
 743
 744    /* build table of device driver functions */
 745    _mesa_init_driver_functions(&functions);
 746    functions.GetString = get_string;
 747    functions.UpdateState = update_state;
 748    functions.GetBufferSize = get_buffer_size;
 749    functions.Viewport = viewport;
 750
 751    if (!_mesa_initialize_context(&ctx->glcontext, &visual->glvisual,
 752                                  share ? &share->glcontext : NULL,
 753                                  &functions, (void *) ctx)) {
 754       _mesa_free(ctx);
 755       return NULL;
 756    }
 757
 758    ctx->visual = visual;
 759
 760    /* Create module contexts */
 761    glctx = (GLcontext *) &ctx->glcontext;
 762    _swrast_CreateContext( glctx );
 763    _ac_CreateContext( glctx );
 764    _tnl_CreateContext( glctx );
 765    _swsetup_CreateContext( glctx );
 766    _swsetup_Wakeup( glctx );
 767
 768    /* use default TCL pipeline */
 769    {
 770       TNLcontext *tnl = TNL_CONTEXT(glctx);
 771       tnl->Driver.RunPipeline = _tnl_run_pipeline;
 772    }
 773
 774    _mesa_enable_sw_extensions(glctx);
 775
 776    return ctx;
 777 }
 778
 779
 780 void
 781 glFBDevDestroyContext( GLFBDevContextPtr context )
 782 {
 783    GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
 784
 785    if (context) {
 786       if (fbdevctx == context) {
 787          /* destroying current context */
 788          _mesa_make_current(NULL, NULL, NULL);
 789          _mesa_notifyDestroy(&context->glcontext);
 790       }
 791       _mesa_free_context_data(&context->glcontext);
 792       _mesa_free(context);
 793    }
 794 }
 795
 796
 797 int
 798 glFBDevGetContextAttrib( const GLFBDevContextPtr context, int attrib)
 799 {
 800    (void) context;
 801    (void) attrib;
 802    return -1;
 803 }
 804
 805
 806 GLFBDevContextPtr
 807 glFBDevGetCurrentContext( void )
 808 {
 809    GET_CURRENT_CONTEXT(ctx);
 810    return (GLFBDevContextPtr) ctx;
 811 }
 812
 813
 814 int
 815 glFBDevMakeCurrent( GLFBDevContextPtr context,
 816                     GLFBDevBufferPtr drawBuffer,
 817                     GLFBDevBufferPtr readBuffer )
 818 {
 819    if (context && drawBuffer && readBuffer) {
 820       /* Make sure the context's visual and the buffers' visuals match.
 821        * XXX we might do this by comparing specific fields like bits_per_pixel,
 822        * visual, etc. in the future.
 823        */
 824       if (context->visual != drawBuffer->visual ||
 825           context->visual != readBuffer->visual) {
 826          return 0;
 827       }
 828       _mesa_make_current( &context->glcontext,
 829                           &drawBuffer->glframebuffer,
 830                           &readBuffer->glframebuffer );
 831       context->drawBuffer = drawBuffer;
 832       context->readBuffer = readBuffer;
 833       context->curBuffer = drawBuffer;
 834    }
 835    else {
 836       /* unbind */
 837       _mesa_make_current( NULL, NULL, NULL );
 838    }
 839
 840    return 1;
 841 }
 842
 843 #endif /* USE_GLFBDEV_DRIVER */