via_screen.c

来自「mesa-6.5-minigui源码」· C语言 代码 · 共 503 行 · 第 1/2 页

       * gl_framebuffer object.
       */
      /* XXX check/fix the offset/pitch parameters! */
      {
         driRenderbuffer *frontRb
            = driNewRenderbuffer(GL_RGBA, NULL,
                                 screen->bytesPerPixel,
                                 0, screen->width, driDrawPriv);
         viaSetSpanFunctions(frontRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontRb->Base);
      }

      if (mesaVis->doubleBufferMode) {
         driRenderbuffer *backRb
            = driNewRenderbuffer(GL_RGBA, NULL,
                                 screen->bytesPerPixel,
                                 0, screen->width, driDrawPriv);
         viaSetSpanFunctions(backRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backRb->Base);
      }

      if (mesaVis->depthBits == 16) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT16, NULL,
                                 screen->bytesPerPixel,
                                 0, screen->width, driDrawPriv);
         viaSetSpanFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }
      else if (mesaVis->depthBits == 24) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT24, NULL,
                                 screen->bytesPerPixel,
                                 0, screen->width, driDrawPriv);
         viaSetSpanFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }
      else if (mesaVis->depthBits == 32) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT32, NULL,
                                 screen->bytesPerPixel,
                                 0, screen->width, driDrawPriv);
         viaSetSpanFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }

      if (mesaVis->stencilBits > 0 && !swStencil) {
         driRenderbuffer *stencilRb
            = driNewRenderbuffer(GL_STENCIL_INDEX8_EXT, NULL,
                                 screen->bytesPerPixel,
                                 0, screen->width, driDrawPriv);
         viaSetSpanFunctions(stencilRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &stencilRb->Base);
      }
#endif

      _mesa_add_soft_renderbuffers(fb,
                                   GL_FALSE, /* color */
                                   GL_FALSE, /* depth */
                                   swStencil,
                                   swAccum,
                                   GL_FALSE, /* alpha */
                                   GL_FALSE /* aux */);
      driDrawPriv->driverPrivate = (void *) fb;

      return (driDrawPriv->driverPrivate != NULL);
   }
}


static void
viaDestroyBuffer(__DRIdrawablePrivate *driDrawPriv)
{
    _mesa_destroy_framebuffer((GLframebuffer *)(driDrawPriv->driverPrivate));
}



static struct __DriverAPIRec viaAPI = {
   .InitDriver      = viaInitDriver,
   .DestroyScreen   = viaDestroyScreen,
   .CreateContext   = viaCreateContext,
   .DestroyContext  = viaDestroyContext,
   .CreateBuffer    = viaCreateBuffer,
   .DestroyBuffer   = viaDestroyBuffer,
   .SwapBuffers     = viaSwapBuffers,
   .MakeCurrent     = viaMakeCurrent,
   .UnbindContext   = viaUnbindContext,
   .GetSwapInfo     = getSwapInfo,
   .GetMSC          = driGetMSC32,
   .WaitForMSC      = driWaitForMSC32,
   .WaitForSBC      = NULL,
   .SwapBuffersMSC  = NULL
};


static __GLcontextModes *
viaFillInModes( unsigned pixel_bits, GLboolean have_back_buffer )
{
    __GLcontextModes * modes;
    __GLcontextModes * m;
    unsigned num_modes;
    const unsigned back_buffer_factor = (have_back_buffer) ? 2 : 1;
    GLenum fb_format;
    GLenum fb_type;

    /* Right now GLX_SWAP_COPY_OML isn't supported, but it would be easy
     * enough to add support.  Basically, if a context is created with an
     * fbconfig where the swap method is GLX_SWAP_COPY_OML, pageflipping
     * will never be used.
     */
    static const GLenum back_buffer_modes[] = {
	GLX_NONE, GLX_SWAP_UNDEFINED_OML /*, GLX_SWAP_COPY_OML */
    };

    /* The 32-bit depth-buffer mode isn't supported yet, so don't actually
     * enable it.
     */
    static const u_int8_t depth_bits_array[4]   = { 0, 16, 24, 32 };
    static const u_int8_t stencil_bits_array[4] = { 0,  0,  8,  0 };
    const unsigned depth_buffer_factor = 3;


    num_modes = depth_buffer_factor * back_buffer_factor * 4;

    if ( pixel_bits == 16 ) {
        fb_format = GL_RGB;
        fb_type = GL_UNSIGNED_SHORT_5_6_5;
    }
    else {
        fb_format = GL_BGRA;
        fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
    }

    modes = (*dri_interface->createContextModes)( num_modes, sizeof( __GLcontextModes ) );
    m = modes;
    if ( ! driFillInModes( & m, fb_format, fb_type,
			   depth_bits_array, stencil_bits_array, 
			   depth_buffer_factor,
			   back_buffer_modes, back_buffer_factor,
			   GLX_TRUE_COLOR ) ) {
	fprintf( stderr, "[%s:%u] Error creating FBConfig!\n",
		 __func__, __LINE__ );
	return NULL;
    }

    if ( ! driFillInModes( & m, fb_format, fb_type,
			   depth_bits_array, stencil_bits_array, 
			   depth_buffer_factor,
			   back_buffer_modes, back_buffer_factor,
			   GLX_DIRECT_COLOR ) ) {
	fprintf( stderr, "[%s:%u] Error creating FBConfig!\n",
		 __func__, __LINE__ );
	return NULL;
    }

    return modes;
}


/**
 * This is the bootstrap function for the driver.  libGL supplies all of the
 * requisite information about the system, and the driver initializes itself.
 * This routine also fills in the linked list pointed to by \c driver_modes
 * with the \c __GLcontextModes that the driver can support for windows or
 * pbuffers.
 * 
 * \return A pointer to a \c __DRIscreenPrivate on success, or \c NULL on 
 *         failure.
 */
PUBLIC
void * __driCreateNewScreen_20050727( __DRInativeDisplay *dpy, int scrn,
			     __DRIscreen *psc,
			     const __GLcontextModes * modes,
			     const __DRIversion * ddx_version,
			     const __DRIversion * dri_version,
			     const __DRIversion * drm_version,
			     const __DRIframebuffer * frame_buffer,
			     drmAddress pSAREA, int fd, 
			     int internal_api_version,
			     const __DRIinterfaceMethods * interface,
			     __GLcontextModes ** driver_modes )
			     
{
   __DRIscreenPrivate *psp;
   static const __DRIversion ddx_expected = { VIA_DRIDDX_VERSION_MAJOR,
                                              VIA_DRIDDX_VERSION_MINOR,
                                              VIA_DRIDDX_VERSION_PATCH };
   static const __DRIversion dri_expected = { 4, 0, 0 };
   static const __DRIversion drm_expected = { 2, 3, 0 };

   dri_interface = interface;

   if ( ! driCheckDriDdxDrmVersions2( "Unichrome",
				      dri_version, & dri_expected,
				      ddx_version, & ddx_expected,
				      drm_version, & drm_expected ) ) {
      return NULL;
   }
      
   psp = __driUtilCreateNewScreen(dpy, scrn, psc, NULL,
				  ddx_version, dri_version, drm_version,
				  frame_buffer, pSAREA, fd,
				  internal_api_version, &viaAPI);
   if ( psp != NULL ) {
      VIADRIPtr dri_priv = (VIADRIPtr) psp->pDevPriv;
      *driver_modes = viaFillInModes( dri_priv->bytesPerPixel * 8,
				      GL_TRUE );

      /* Calling driInitExtensions here, with a NULL context pointer, does not actually
       * enable the extensions.  It just makes sure that all the dispatch offsets for all
       * the extensions that *might* be enables are known.  This is needed because the
       * dispatch offsets need to be known when _mesa_context_create is called, but we can't
       * enable the extensions until we have a context pointer.
       *
       * Hello chicken.  Hello egg.  How are you two today?
       */
      driInitExtensions( NULL, card_extensions, GL_FALSE );
   }

   fprintf(stderr, "%s - succeeded\n", __FUNCTION__);
   return (void *) psp;
}


/**
 * Get information about previous buffer swaps.
 */
static int
getSwapInfo( __DRIdrawablePrivate *dPriv, __DRIswapInfo * sInfo )
{
   struct via_context *vmesa;

   if ( (dPriv == NULL) || (dPriv->driContextPriv == NULL)
	|| (dPriv->driContextPriv->driverPrivate == NULL)
	|| (sInfo == NULL) ) {
      return -1;
   }

   vmesa = (struct via_context *) dPriv->driContextPriv->driverPrivate;
   sInfo->swap_count = vmesa->swap_count;
   sInfo->swap_ust = vmesa->swap_ust;
   sInfo->swap_missed_count = vmesa->swap_missed_count;

   sInfo->swap_missed_usage = (sInfo->swap_missed_count != 0)
       ? driCalculateSwapUsage( dPriv, 0, vmesa->swap_missed_ust )
       : 0.0;

   return 0;
}