glfbdev.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

   }
   else {
      indexBits = varInfo->bits_per_pixel;
      if ((fixInfo->visual == FB_VISUAL_PSEUDOCOLOR ||
           fixInfo->visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
          && varInfo->bits_per_pixel == 8) {
         vis->pixelFormat = PF_CI8;
      }
      else {
         _mesa_problem(NULL, "Unsupported fbdev CI visual/bitdepth!\n");
         _mesa_free(vis);
         return NULL;
      }
   }

   if (!_mesa_initialize_visual(&vis->glvisual, rgbFlag, dbFlag, stereoFlag,
                                redBits, greenBits, blueBits, alphaBits,
                                indexBits, depthBits, stencilBits,
                                accumRedBits, accumGreenBits,
                                accumBlueBits, accumAlphaBits,
                                numSamples)) {
      /* something was invalid */
      _mesa_free(vis);
      return NULL;
   }

   return vis;
}


void
glFBDevDestroyVisual( GLFBDevVisualPtr visual )
{
   if (visual)
      _mesa_free(visual);
}


int
glFBDevGetVisualAttrib( const GLFBDevVisualPtr visual, int attrib)
{
   /* XXX unfinished */
   (void) visual;
   (void) attrib;
   return -1;
}


static void
delete_renderbuffer(struct gl_renderbuffer *rb)
{
   struct GLFBDevRenderbufferRec *frb = (struct GLFBDevRenderbufferRec *) rb;
   if (frb->mallocedBuffer) {
      _mesa_free(frb->Base.Data);
   }
   _mesa_free(frb);
}


static GLboolean
renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                     GLenum internalFormat, GLuint width, GLuint height)
{
   /* no-op: the renderbuffer storage is allocated just once when it's
    * created.  Never resized or reallocated.
    */
   return GL_TRUE;
}


static struct GLFBDevRenderbufferRec *
new_glfbdev_renderbuffer(void *bufferStart, const GLFBDevVisualPtr visual)
{
   struct GLFBDevRenderbufferRec *rb = CALLOC_STRUCT(GLFBDevRenderbufferRec);
   if (rb) {
      GLuint name = 0;
      int pixelFormat = visual->pixelFormat;

      _mesa_init_renderbuffer(&rb->Base, name);

      rb->Base.Delete = delete_renderbuffer;
      rb->Base.AllocStorage = renderbuffer_storage;

      if (pixelFormat == PF_B8G8R8) {
         rb->Base.GetRow = get_row_B8G8R8;
         rb->Base.GetValues = get_values_B8G8R8;
         rb->Base.PutRow = put_row_B8G8R8;
         rb->Base.PutRowRGB = put_row_rgb_B8G8R8;
         rb->Base.PutMonoRow = put_mono_row_B8G8R8;
         rb->Base.PutValues = put_values_B8G8R8;
         rb->Base.PutMonoValues = put_mono_values_B8G8R8;
      }
      else if (pixelFormat == PF_B8G8R8A8) {
         rb->Base.GetRow = get_row_B8G8R8A8;
         rb->Base.GetValues = get_values_B8G8R8A8;
         rb->Base.PutRow = put_row_B8G8R8A8;
         rb->Base.PutRowRGB = put_row_rgb_B8G8R8A8;
         rb->Base.PutMonoRow = put_mono_row_B8G8R8A8;
         rb->Base.PutValues = put_values_B8G8R8A8;
         rb->Base.PutMonoValues = put_mono_values_B8G8R8A8;
      }
      else if (pixelFormat == PF_B5G6R5) {
         rb->Base.GetRow = get_row_B5G6R5;
         rb->Base.GetValues = get_values_B5G6R5;
         rb->Base.PutRow = put_row_B5G6R5;
         rb->Base.PutRowRGB = put_row_rgb_B5G6R5;
         rb->Base.PutMonoRow = put_mono_row_B5G6R5;
         rb->Base.PutValues = put_values_B5G6R5;
         rb->Base.PutMonoValues = put_mono_values_B5G6R5;
      }
      else if (pixelFormat == PF_B5G5R5) {
         rb->Base.GetRow = get_row_B5G5R5;
         rb->Base.GetValues = get_values_B5G5R5;
         rb->Base.PutRow = put_row_B5G5R5;
         rb->Base.PutRowRGB = put_row_rgb_B5G5R5;
         rb->Base.PutMonoRow = put_mono_row_B5G5R5;
         rb->Base.PutValues = put_values_B5G5R5;
         rb->Base.PutMonoValues = put_mono_values_B5G5R5;
      }
      else if (pixelFormat == PF_CI8) {
         rb->Base.GetRow = get_row_CI8;
         rb->Base.GetValues = get_values_CI8;
         rb->Base.PutRow = put_row_CI8;
         rb->Base.PutMonoRow = put_mono_row_CI8;
         rb->Base.PutValues = put_values_CI8;
         rb->Base.PutMonoValues = put_mono_values_CI8;
      }

      if (pixelFormat == PF_CI8) {
         rb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
         rb->Base._BaseFormat = GL_COLOR_INDEX;
      }
      else {
         rb->Base.InternalFormat = GL_RGBA;
         rb->Base._BaseFormat = GL_RGBA;
      }
      rb->Base.DataType = GL_UNSIGNED_BYTE;
      rb->Base.Data = bufferStart;

      rb->rowStride = visual->var.xres_virtual * visual->var.bits_per_pixel / 8;
      rb->bottom = (GLubyte *) bufferStart
                 + (visual->var.yres - 1) * rb->rowStride;

      rb->Base.Width = visual->var.xres;
      rb->Base.Height = visual->var.yres;

      rb->Base.RedBits = visual->var.red.length;
      rb->Base.GreenBits = visual->var.green.length;
      rb->Base.BlueBits = visual->var.blue.length;
      rb->Base.AlphaBits = visual->var.transp.length;

      rb->Base.InternalFormat = pixelFormat;
   }
   return rb;
}

GLFBDevBufferPtr
glFBDevCreateBuffer( const struct fb_fix_screeninfo *fixInfo,
                     const struct fb_var_screeninfo *varInfo,
                     const GLFBDevVisualPtr visual,
                     void *frontBuffer, void *backBuffer, size_t size )
{
   struct GLFBDevRenderbufferRec *frontrb, *backrb;
   GLFBDevBufferPtr buf;

   ASSERT(visual);
   ASSERT(frontBuffer);
   ASSERT(size > 0);

   /* this is to update the visual if there was a resize and the
      buffer is created again */
   visual->var = *varInfo;
   visual->fix = *fixInfo;

   if (visual->fix.visual != fixInfo->visual ||
       visual->fix.type != fixInfo->type ||
       visual->var.bits_per_pixel != varInfo->bits_per_pixel ||
       visual->var.grayscale != varInfo->grayscale ||
       visual->var.red.offset != varInfo->red.offset ||
       visual->var.green.offset != varInfo->green.offset ||
       visual->var.blue.offset != varInfo->blue.offset ||
       visual->var.transp.offset != varInfo->transp.offset) {
      /* visual mismatch! */
      return NULL;
   }

   buf = CALLOC_STRUCT(GLFBDevBufferRec);
   if (!buf)
      return NULL;

   /* basic framebuffer setup */
   _mesa_initialize_framebuffer(&buf->glframebuffer, &visual->glvisual);
   /* add front renderbuffer */
   frontrb = new_glfbdev_renderbuffer(frontBuffer, visual);
   _mesa_add_renderbuffer(&buf->glframebuffer, BUFFER_FRONT_LEFT,
                          &frontrb->Base);
   /* add back renderbuffer */
   if (visual->glvisual.doubleBufferMode) {
      const int malloced = !backBuffer;
      if (malloced) {
         /* malloc a back buffer */
         backBuffer = _mesa_malloc(size);
         if (!backBuffer) {
            _mesa_free_framebuffer_data(&buf->glframebuffer);
            _mesa_free(buf);
            return NULL;
         }
      }

      backrb = new_glfbdev_renderbuffer(backBuffer, visual);
      if (!backrb) {
         /* out of mem */
         return NULL;
      }
      backrb->mallocedBuffer = malloced;

      _mesa_add_renderbuffer(&buf->glframebuffer, BUFFER_BACK_LEFT,
                             &backrb->Base);
   }
   /* add software renderbuffers */
   _mesa_add_soft_renderbuffers(&buf->glframebuffer,
                                GL_FALSE, /* color */
                                visual->glvisual.haveDepthBuffer,
                                visual->glvisual.haveStencilBuffer,
                                visual->glvisual.haveAccumBuffer,
                                GL_FALSE, /* alpha */
                                GL_FALSE /* aux bufs */);

   buf->fix = *fixInfo;   /* struct assignment */
   buf->var = *varInfo;   /* struct assignment */
   buf->visual = visual;  /* ptr assignment */
   buf->size = size;
   buf->bytesPerPixel = visual->var.bits_per_pixel / 8;

   return buf;
}


void
glFBDevDestroyBuffer( GLFBDevBufferPtr buffer )
{
   if (buffer) {
      /* check if destroying the current buffer */
      GLFBDevBufferPtr curDraw = glFBDevGetCurrentDrawBuffer();
      GLFBDevBufferPtr curRead = glFBDevGetCurrentReadBuffer();
      if (buffer == curDraw || buffer == curRead) {
         glFBDevMakeCurrent( NULL, NULL, NULL);
      }
      {
         struct gl_framebuffer *fb = &buffer->glframebuffer;
         _mesa_unreference_framebuffer(&fb);
      }
   }
}


int
glFBDevGetBufferAttrib( const GLFBDevBufferPtr buffer, int attrib)
{
   (void) buffer;
   (void) attrib;
   return -1;
}


GLFBDevBufferPtr
glFBDevGetCurrentDrawBuffer( void )
{
   GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
   if (fbdevctx)
      return fbdevctx->drawBuffer;
   else
      return NULL;
}


GLFBDevBufferPtr
glFBDevGetCurrentReadBuffer( void )
{
   GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
   if (fbdevctx)
      return fbdevctx->readBuffer;
   else
      return NULL;
}


void
glFBDevSwapBuffers( GLFBDevBufferPtr buffer )
{
   GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();
   struct GLFBDevRenderbufferRec *frontrb = (struct GLFBDevRenderbufferRec *)
      buffer->glframebuffer.Attachment[BUFFER_FRONT_LEFT].Renderbuffer;
   struct GLFBDevRenderbufferRec *backrb = (struct GLFBDevRenderbufferRec *)
      buffer->glframebuffer.Attachment[BUFFER_BACK_LEFT].Renderbuffer;

   if (!buffer || !buffer->visual->glvisual.doubleBufferMode)
      return;

   /* check if swapping currently bound buffer */
   if (fbdevctx->drawBuffer == buffer) {
      /* flush pending rendering */
      _mesa_notifySwapBuffers(&fbdevctx->glcontext);
   }

   ASSERT(frontrb->Base.Data);
   ASSERT(backrb->Base.Data);
   _mesa_memcpy(frontrb->Base.Data, backrb->Base.Data, buffer->size);
}


GLFBDevContextPtr
glFBDevCreateContext( const GLFBDevVisualPtr visual, GLFBDevContextPtr share )
{
   GLFBDevContextPtr ctx;
   GLcontext *glctx;
   struct dd_function_table functions;

   ASSERT(visual);

   ctx = CALLOC_STRUCT(GLFBDevContextRec);
   if (!ctx)
      return NULL;

   /* build table of device driver functions */
   _mesa_init_driver_functions(&functions);
   functions.GetString = get_string;
   functions.UpdateState = update_state;
   functions.GetBufferSize = get_buffer_size;
   functions.Viewport = viewport;

   if (!_mesa_initialize_context(&ctx->glcontext, &visual->glvisual,
                                 share ? &share->glcontext : NULL,
                                 &functions, (void *) ctx)) {
      _mesa_free(ctx);
      return NULL;
   }

   ctx->visual = visual;

   /* Create module contexts */
   glctx = (GLcontext *) &ctx->glcontext;
   _swrast_CreateContext( glctx );
   _vbo_CreateContext( glctx );
   _tnl_CreateContext( glctx );
   _swsetup_CreateContext( glctx );
   _swsetup_Wakeup( glctx );

   /* use default TCL pipeline */
   {
      TNLcontext *tnl = TNL_CONTEXT(glctx);
      tnl->Driver.RunPipeline = _tnl_run_pipeline;
   }

   _mesa_enable_sw_extensions(glctx);
   _mesa_enable_1_3_extensions(glctx);
   _mesa_enable_1_4_extensions(glctx);
   _mesa_enable_1_5_extensions(glctx);
   _mesa_enable_2_0_extensions(glctx);
   _mesa_enable_2_1_extensions(glctx);

   return ctx;
}


void
glFBDevDestroyContext( GLFBDevContextPtr context )
{
   GLFBDevContextPtr fbdevctx = glFBDevGetCurrentContext();

   if (context) {
      GLcontext *mesaCtx = &context->glcontext;

      _swsetup_DestroyContext( mesaCtx );
      _swrast_DestroyContext( mesaCtx );
      _tnl_DestroyContext( mesaCtx );
      _vbo_DestroyContext( mesaCtx );

      if (fbdevctx == context) {
         /* destroying current context */
         _mesa_make_current(NULL, NULL, NULL);
      }
      _mesa_free_context_data(&context->glcontext);
      _mesa_free(context);
   }
}


int
glFBDevGetContextAttrib( const GLFBDevContextPtr context, int attrib)
{
   (void) context;
   (void) attrib;
   return -1;
}


GLFBDevContextPtr
glFBDevGetCurrentContext( void )
{
   GET_CURRENT_CONTEXT(ctx);
   return (GLFBDevContextPtr) ctx;
}


int
glFBDevMakeCurrent( GLFBDevContextPtr context,
                    GLFBDevBufferPtr drawBuffer,
                    GLFBDevBufferPtr readBuffer )
{
   if (context && drawBuffer && readBuffer) {
      /* Make sure the context's visual and the buffers' visuals match.
       * XXX we might do this by comparing specific fields like bits_per_pixel,
       * visual, etc. in the future.
       */
      if (context->visual != drawBuffer->visual ||
          context->visual != readBuffer->visual) {
         return 0;
      }
      _mesa_make_current( &context->glcontext,
                          &drawBuffer->glframebuffer,
                          &readBuffer->glframebuffer );
      context->drawBuffer = drawBuffer;
      context->readBuffer = readBuffer;
      context->curBuffer = drawBuffer;
   }
   else {
      /* unbind */
      _mesa_make_current( NULL, NULL, NULL );
   }

   return 1;
}

#endif /* USE_GLFBDEV_DRIVER */