intel_screen.c

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

   }

   /* Allocate the private area */
   intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
   if (!intelScreen) {
      fprintf(stderr, "\nERROR!  Allocating private area failed\n");
      return GL_FALSE;
   }
   /* parse information in __driConfigOptions */
   driParseOptionInfo(&intelScreen->optionCache,
                      __driConfigOptions, __driNConfigOptions);

   intelScreen->driScrnPriv = sPriv;
   sPriv->private = (void *) intelScreen;
   intelScreen->sarea_priv_offset = gDRIPriv->sarea_priv_offset;
   sarea = (struct drm_i915_sarea *)
      (((GLubyte *) sPriv->pSAREA) + intelScreen->sarea_priv_offset);

   intelScreen->deviceID = gDRIPriv->deviceID;

   intelUpdateScreenFromSAREA(intelScreen, sarea);

   if (!intelMapScreenRegions(sPriv)) {
      fprintf(stderr, "\nERROR!  mapping regions\n");
      _mesa_free(intelScreen);
      sPriv->private = NULL;
      return GL_FALSE;
   }

   intelScreen->sarea_priv_offset = gDRIPriv->sarea_priv_offset;

   if (0)
      intelPrintDRIInfo(intelScreen, sPriv, gDRIPriv);

   intelScreen->drmMinor = sPriv->drm_version.minor;

   /* Determine if IRQs are active? */
   if (!intel_get_param(sPriv, I915_PARAM_IRQ_ACTIVE,
			&intelScreen->irq_active))
      return GL_FALSE;

   /* Determine if batchbuffers are allowed */
   if (!intel_get_param(sPriv, I915_PARAM_ALLOW_BATCHBUFFER,
			&intelScreen->allow_batchbuffer))
      return GL_FALSE;

   sPriv->extensions = intelScreenExtensions;

   return GL_TRUE;
}


static void
intelDestroyScreen(__DRIscreenPrivate * sPriv)
{
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;

   intelUnmapScreenRegions(intelScreen);

   FREE(intelScreen);
   sPriv->private = NULL;
}


/**
 * This is called when we need to set up GL rendering to a new X window.
 */
static GLboolean
intelCreateBuffer(__DRIscreenPrivate * driScrnPriv,
                  __DRIdrawablePrivate * driDrawPriv,
                  const __GLcontextModes * mesaVis, GLboolean isPixmap)
{
   intelScreenPrivate *screen = (intelScreenPrivate *) driScrnPriv->private;

   if (isPixmap) {
      return GL_FALSE;          /* not implemented */
   }
   else {
      GLboolean swStencil = (mesaVis->stencilBits > 0 &&
                             mesaVis->depthBits != 24);
      GLenum rgbFormat = (mesaVis->redBits == 5 ? GL_RGB5 : GL_RGBA8);

      struct intel_framebuffer *intel_fb = CALLOC_STRUCT(intel_framebuffer);

      if (!intel_fb)
	 return GL_FALSE;

      _mesa_initialize_framebuffer(&intel_fb->Base, mesaVis);

      /* setup the hardware-based renderbuffers */
      {
         intel_fb->color_rb[0] = intel_create_renderbuffer(rgbFormat);
         _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT,
				&intel_fb->color_rb[0]->Base);
      }

      if (mesaVis->doubleBufferMode) {
         intel_fb->color_rb[1] = intel_create_renderbuffer(rgbFormat);
         _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT,
				&intel_fb->color_rb[1]->Base);

	 if (screen->third.handle) {
	    struct gl_renderbuffer *tmp_rb = NULL;

	    intel_fb->color_rb[2] = intel_create_renderbuffer(rgbFormat);
	    _mesa_reference_renderbuffer(&tmp_rb, &intel_fb->color_rb[2]->Base);
	 }
      }

      if (mesaVis->depthBits == 24) {
	 if (mesaVis->stencilBits == 8) {
	    /* combined depth/stencil buffer */
	    struct intel_renderbuffer *depthStencilRb
	       = intel_create_renderbuffer(GL_DEPTH24_STENCIL8_EXT);
	    /* note: bind RB to two attachment points */
	    _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
				   &depthStencilRb->Base);
	    _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_STENCIL,
				   &depthStencilRb->Base);
	 } else {
	    struct intel_renderbuffer *depthRb
	       = intel_create_renderbuffer(GL_DEPTH_COMPONENT24);
	    _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
				   &depthRb->Base);
	 }
      }
      else if (mesaVis->depthBits == 16) {
         /* just 16-bit depth buffer, no hw stencil */
         struct intel_renderbuffer *depthRb
            = intel_create_renderbuffer(GL_DEPTH_COMPONENT16);
         _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH, &depthRb->Base);
      }

      /* now add any/all software-based renderbuffers we may need */
      _mesa_add_soft_renderbuffers(&intel_fb->Base,
                                   GL_FALSE, /* never sw color */
                                   GL_FALSE, /* never sw depth */
                                   swStencil, mesaVis->accumRedBits > 0,
                                   GL_FALSE, /* never sw alpha */
                                   GL_FALSE  /* never sw aux */ );
      driDrawPriv->driverPrivate = (void *) intel_fb;

      return GL_TRUE;
   }
}

static void
intelDestroyBuffer(__DRIdrawablePrivate * driDrawPriv)
{
   _mesa_unreference_framebuffer((GLframebuffer **)(&(driDrawPriv->driverPrivate)));
}


/**
 * Get information about previous buffer swaps.
 */
static int
intelGetSwapInfo(__DRIdrawablePrivate * dPriv, __DRIswapInfo * sInfo)
{
   struct intel_framebuffer *intel_fb;

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

   intel_fb = dPriv->driverPrivate;
   sInfo->swap_count = intel_fb->swap_count;
   sInfo->swap_ust = intel_fb->swap_ust;
   sInfo->swap_missed_count = intel_fb->swap_missed_count;

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

   return 0;
}


/* There are probably better ways to do this, such as an
 * init-designated function to register chipids and createcontext
 * functions.
 */
extern GLboolean i830CreateContext(const __GLcontextModes * mesaVis,
                                   __DRIcontextPrivate * driContextPriv,
                                   void *sharedContextPrivate);

extern GLboolean i915CreateContext(const __GLcontextModes * mesaVis,
                                   __DRIcontextPrivate * driContextPriv,
                                   void *sharedContextPrivate);
extern GLboolean brwCreateContext(const __GLcontextModes * mesaVis,
				  __DRIcontextPrivate * driContextPriv,
				  void *sharedContextPrivate);

static GLboolean
intelCreateContext(const __GLcontextModes * mesaVis,
                   __DRIcontextPrivate * driContextPriv,
                   void *sharedContextPrivate)
{
   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;

#ifdef I915
   if (IS_9XX(intelScreen->deviceID)) {
      if (!IS_965(intelScreen->deviceID)) {
	 return i915CreateContext(mesaVis, driContextPriv,
				  sharedContextPrivate);
      }
   } else {
      return i830CreateContext(mesaVis, driContextPriv, sharedContextPrivate);
   }
#else
   if (IS_965(intelScreen->deviceID))
      return brwCreateContext(mesaVis, driContextPriv, sharedContextPrivate);
#endif
   fprintf(stderr, "Unrecognized deviceID %x\n", intelScreen->deviceID);
   return GL_FALSE;
}


static __DRIconfig **
intelFillInModes(__DRIscreenPrivate *psp,
		 unsigned pixel_bits, unsigned depth_bits,
                 unsigned stencil_bits, GLboolean have_back_buffer)
{
   __DRIconfig **configs;
   __GLcontextModes *m;
   unsigned depth_buffer_factor;
   unsigned back_buffer_factor;
   GLenum fb_format;
   GLenum fb_type;
   int i;

   /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
    * support pageflipping at all.
    */
   static const GLenum back_buffer_modes[] = {
      GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
   };

   u_int8_t depth_bits_array[3];
   u_int8_t stencil_bits_array[3];

   depth_bits_array[0] = 0;
   depth_bits_array[1] = depth_bits;
   depth_bits_array[2] = depth_bits;

   /* Just like with the accumulation buffer, always provide some modes
    * with a stencil buffer.  It will be a sw fallback, but some apps won't
    * care about that.
    */
   stencil_bits_array[0] = 0;
   stencil_bits_array[1] = 0;
   if (depth_bits == 24)
      stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;

   stencil_bits_array[2] = (stencil_bits == 0) ? 8 : stencil_bits;

   depth_buffer_factor = ((depth_bits != 0) || (stencil_bits != 0)) ? 3 : 1;
   back_buffer_factor = (have_back_buffer) ? 3 : 1;

   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;
   }

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

   /* Mark the visual as slow if there are "fake" stencil bits.
    */
   for (i = 0; configs[i]; i++) {
      m = &configs[i]->modes;
      if ((m->stencilBits != 0) && (m->stencilBits != stencil_bits)) {
         m->visualRating = GLX_SLOW_CONFIG;
      }
   }

   return configs;
}


/**
 * This is the driver specific part of the createNewScreen entry point.
 * Called when using legacy DRI.
 * 
 * \todo maybe fold this into intelInitDriver
 *
 * \return the __GLcontextModes supported by this driver
 */
static const __DRIconfig **intelInitScreen(__DRIscreenPrivate *psp)
{
#ifdef I915
   static const __DRIversion ddx_expected = { 1, 5, 0 };
#else
   static const __DRIversion ddx_expected = { 1, 6, 0 };
#endif
   static const __DRIversion dri_expected = { 4, 0, 0 };
   static const __DRIversion drm_expected = { 1, 5, 0 };
   I830DRIPtr dri_priv = (I830DRIPtr) psp->pDevPriv;

   if (!driCheckDriDdxDrmVersions2("i915",
                                   &psp->dri_version, &dri_expected,
                                   &psp->ddx_version, &ddx_expected,
                                   &psp->drm_version, &drm_expected)) {
      return NULL;
   }

   /* 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?
    */
   intelInitExtensions(NULL, GL_TRUE);
	   
   if (!intelInitDriver(psp))
       return NULL;

   psp->extensions = intelScreenExtensions;

   return (const __DRIconfig **)
       intelFillInModes(psp, dri_priv->cpp * 8,
			(dri_priv->cpp == 2) ? 16 : 24,
			(dri_priv->cpp == 2) ? 0  : 8, 1);
}

struct intel_context *intelScreenContext(intelScreenPrivate *intelScreen)
{
  /*
   * This should probably change to have the screen allocate a dummy
   * context at screen creation. For now just use the current context.
   */

  GET_CURRENT_CONTEXT(ctx);
  if (ctx == NULL) {
     _mesa_problem(NULL, "No current context in intelScreenContext\n");
     return NULL;
  }
  return intel_context(ctx);
}

/**
 * This is the driver specific part of the createNewScreen entry point.
 * Called when using DRI2.
 *
 * \return the __GLcontextModes supported by this driver
 */
static const
__DRIconfig **intelInitScreen2(__DRIscreenPrivate *psp)
{
   intelScreenPrivate *intelScreen;

   /* 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?
    */
   intelInitExtensions(NULL, GL_TRUE);

   /* Allocate the private area */
   intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
   if (!intelScreen) {
      fprintf(stderr, "\nERROR!  Allocating private area failed\n");
      return GL_FALSE;
   }
   /* parse information in __driConfigOptions */
   driParseOptionInfo(&intelScreen->optionCache,
                      __driConfigOptions, __driNConfigOptions);

   intelScreen->driScrnPriv = psp;
   psp->private = (void *) intelScreen;

   intelScreen->drmMinor = psp->drm_version.minor;

   /* Determine chipset ID? */
   if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
			&intelScreen->deviceID))
      return GL_FALSE;

   /* Determine if IRQs are active? */
   if (!intel_get_param(psp, I915_PARAM_IRQ_ACTIVE,
			&intelScreen->irq_active))
      return GL_FALSE;

   /* Determine if batchbuffers are allowed */
   if (!intel_get_param(psp, I915_PARAM_ALLOW_BATCHBUFFER,
			&intelScreen->allow_batchbuffer))
      return GL_FALSE;

   if (!intelScreen->allow_batchbuffer) {
      fprintf(stderr, "batch buffer not allowed\n");
      return GL_FALSE;
   }

   psp->extensions = intelScreenExtensions;

   return driConcatConfigs(intelFillInModes(psp, 16, 16, 0, 1),
			   intelFillInModes(psp, 32, 24, 8, 1));
}

const struct __DriverAPIRec driDriverAPI = {
   .InitScreen		 = intelInitScreen,
   .DestroyScreen	 = intelDestroyScreen,
   .CreateContext	 = intelCreateContext,
   .DestroyContext	 = intelDestroyContext,
   .CreateBuffer	 = intelCreateBuffer,
   .DestroyBuffer	 = intelDestroyBuffer,
   .SwapBuffers		 = intelSwapBuffers,
   .MakeCurrent		 = intelMakeCurrent,
   .UnbindContext	 = intelUnbindContext,
   .GetSwapInfo		 = intelGetSwapInfo,
   .GetDrawableMSC	 = driDrawableGetMSC32,
   .WaitForMSC		 = driWaitForMSC32,
   .CopySubBuffer	 = intelCopySubBuffer,

   .InitScreen2		 = intelInitScreen2,
   .HandleDrawableConfig = intelHandleDrawableConfig,
   .HandleBufferAttach	 = intelHandleBufferAttach,
};