ffb_xmesa.c

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

      if (mesaVis->depthBits == 16) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT16, NULL, bpp, offset,
                                 bogusPitch, driDrawPriv);
         ffbSetDepthFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }

      if (mesaVis->stencilBits > 0 && !swStencil) {
         driRenderbuffer *stencilRb
            = driNewRenderbuffer(GL_STENCIL_INDEX8_EXT, NULL, bpp, offset,
                                 bogusPitch, driDrawPriv);
         ffbSetStencilFunctions(stencilRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &stencilRb->Base);
      }

      _mesa_add_soft_renderbuffers(fb,
                                   GL_FALSE, /* color */
                                   GL_FALSE, /* depth */
                                   swStencil,
                                   mesaVis->accumRedBits > 0,
                                   GL_FALSE, /* alpha */
                                   GL_FALSE /* aux */);
      driDrawPriv->driverPrivate = (void *) fb;

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


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


#define USE_FAST_SWAP

static void
ffbSwapBuffers( __DRIdrawablePrivate *dPriv )
{
	ffbContextPtr fmesa = (ffbContextPtr) dPriv->driContextPriv->driverPrivate;
	unsigned int fbc, wid, wid_reg_val, dac_db_bit;
	unsigned int shadow_dac_addr, active_dac_addr;
	ffb_fbcPtr ffb;
	ffb_dacPtr dac;

	if (fmesa == NULL ||
	    fmesa->glCtx->Visual.doubleBufferMode == 0)
		return;

	/* Flush pending rendering commands */
	_mesa_notifySwapBuffers(fmesa->glCtx);

	ffb = fmesa->regs;
	dac = fmesa->ffbScreen->dac;

	fbc = fmesa->fbc;
	wid = fmesa->wid;

	/* Swap the buffer we render into and read pixels from. */
	fmesa->back_buffer ^= 1;

	/* If we are writing into both buffers, don't mess with
	 * the WB setting.
	 */
	if ((fbc & FFB_FBC_WB_AB) != FFB_FBC_WB_AB) {
		if ((fbc & FFB_FBC_WB_A) != 0)
			fbc = (fbc & ~FFB_FBC_WB_A) | FFB_FBC_WB_B;
		else
			fbc = (fbc & ~FFB_FBC_WB_B) | FFB_FBC_WB_A;
	}

	/* But either way, we must flip the read buffer setting. */
	if ((fbc & FFB_FBC_RB_A) != 0)
		fbc = (fbc & ~FFB_FBC_RB_A) | FFB_FBC_RB_B;
	else
		fbc = (fbc & ~FFB_FBC_RB_B) | FFB_FBC_RB_A;

	LOCK_HARDWARE(fmesa);

	if (fmesa->fbc != fbc) {
		FFBFifo(fmesa, 1);
		ffb->fbc = fmesa->fbc = fbc;
		fmesa->ffbScreen->rp_active = 1;
	}

	/* And swap the buffer displayed in the WID. */
	if (fmesa->ffb_sarea->flags & FFB_DRI_PAC1) {
		shadow_dac_addr = FFBDAC_PAC1_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC1_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC1_WLUT_DB;
	} else {
		shadow_dac_addr = FFBDAC_PAC2_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC2_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC2_WLUT_DB;
	}

	FFBWait(fmesa, ffb);

	wid_reg_val = DACCFG_READ(dac, active_dac_addr);
	if (fmesa->back_buffer == 0)
		wid_reg_val |=  dac_db_bit;
	else
		wid_reg_val &= ~dac_db_bit;
#ifdef USE_FAST_SWAP
	DACCFG_WRITE(dac, active_dac_addr, wid_reg_val);
#else
	DACCFG_WRITE(dac, shadow_dac_addr, wid_reg_val);

	/* Schedule the window transfer. */
	DACCFG_WRITE(dac, FFBDAC_CFG_WTCTRL, 
		     (FFBDAC_CFG_WTCTRL_TCMD | FFBDAC_CFG_WTCTRL_TE));

	{
		int limit = 1000000;
		while (limit--) {
			unsigned int wtctrl = DACCFG_READ(dac, FFBDAC_CFG_WTCTRL);

			if ((wtctrl & FFBDAC_CFG_WTCTRL_DS) == 0)
				break;
		}
	}
#endif

	UNLOCK_HARDWARE(fmesa);
}

static void ffb_init_wid(ffbContextPtr fmesa, unsigned int wid)
{
	ffb_dacPtr dac = fmesa->ffbScreen->dac;
	unsigned int wid_reg_val, dac_db_bit, active_dac_addr;
	unsigned int shadow_dac_addr;

	if (fmesa->ffb_sarea->flags & FFB_DRI_PAC1) {
		shadow_dac_addr = FFBDAC_PAC1_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC1_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC1_WLUT_DB;
	} else {
		shadow_dac_addr = FFBDAC_PAC2_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC2_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC2_WLUT_DB;
	}

	wid_reg_val = DACCFG_READ(dac, active_dac_addr);
	wid_reg_val &= ~dac_db_bit;
#ifdef USE_FAST_SWAP
	DACCFG_WRITE(dac, active_dac_addr, wid_reg_val);
#else
	DACCFG_WRITE(dac, shadow_dac_addr, wid_reg_val);

	/* Schedule the window transfer. */
	DACCFG_WRITE(dac, FFBDAC_CFG_WTCTRL, 
		     (FFBDAC_CFG_WTCTRL_TCMD | FFBDAC_CFG_WTCTRL_TE));

	{
		int limit = 1000000;
		while (limit--) {
			unsigned int wtctrl = DACCFG_READ(dac, FFBDAC_CFG_WTCTRL);

			if ((wtctrl & FFBDAC_CFG_WTCTRL_DS) == 0)
				break;
		}
	}
#endif
}

/* Force the context `c' to be the current context and associate with it
   buffer `b' */
static GLboolean
ffbMakeCurrent(__DRIcontextPrivate *driContextPriv,
               __DRIdrawablePrivate *driDrawPriv,
               __DRIdrawablePrivate *driReadPriv)
{
	if (driContextPriv) {
		ffbContextPtr fmesa = (ffbContextPtr) driContextPriv->driverPrivate;
		int first_time;

		fmesa->driDrawable = driDrawPriv;

		_mesa_make_current(fmesa->glCtx, 
			    (GLframebuffer *) driDrawPriv->driverPrivate, 
			    (GLframebuffer *) driReadPriv->driverPrivate);

		first_time = 0;
		if (fmesa->wid == ~0) {
			first_time = 1;
			if (getenv("LIBGL_SOFTWARE_RENDERING"))
				FALLBACK( fmesa->glCtx, FFB_BADATTR_SWONLY, GL_TRUE );
		}

		LOCK_HARDWARE(fmesa);
		if (first_time) {
			fmesa->wid = fmesa->ffb_sarea->wid_table[driDrawPriv->index];
			ffb_init_wid(fmesa, fmesa->wid);
		}

		fmesa->state_dirty |= FFB_STATE_ALL;
		fmesa->state_fifo_ents = fmesa->state_all_fifo_ents;
		ffbSyncHardware(fmesa);
		UNLOCK_HARDWARE(fmesa);

		if (first_time) {
			/* Also, at the first switch to a new context,
			 * we need to clear all the hw buffers.
			 */
			ffbDDClear(fmesa->glCtx,
				   (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT |
				    BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL));
		}
	} else {
		_mesa_make_current(NULL, NULL, NULL);
	}

	return GL_TRUE;
}

/* Force the context `c' to be unbound from its buffer */
static GLboolean
ffbUnbindContext(__DRIcontextPrivate *driContextPriv)
{
	return GL_TRUE;
}

void ffbXMesaUpdateState(ffbContextPtr fmesa)
{
	__DRIdrawablePrivate *dPriv = fmesa->driDrawable;
	__DRIscreenPrivate *sPriv = fmesa->driScreen;
	int stamp = dPriv->lastStamp;

	DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);

	if (dPriv->lastStamp != stamp) {
		GLcontext *ctx = fmesa->glCtx;

		ffbCalcViewport(ctx);
		driUpdateFramebufferSize(ctx, dPriv);
		if (ctx->Polygon.StippleFlag) {
			ffbXformAreaPattern(fmesa,
					    (const GLubyte *)ctx->PolygonStipple);
		}
	}
}

static const __DRIconfig **
ffbFillInModes( __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 FFB 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;
   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 (const __DRIconfig **) configs;
}


/**
 * This is the driver specific part of the createNewScreen entry point.
 * 
 * \todo maybe fold this into intelInitDriver
 *
 * \return the __GLcontextModes supported by this driver
 */
static const __DRIconfig **
ffbInitScreen(__DRIscreen *psp)
{
   static const __DRIversion ddx_expected = { 0, 1, 1 };
   static const __DRIversion dri_expected = { 4, 0, 0 };
   static const __DRIversion drm_expected = { 0, 0, 1 };

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

   if (!ffbInitDriver(psp))
       return NULL;

   return ffbFillInModes( psp, 32, 16, 0, GL_TRUE );
}

const struct __DriverAPIRec driDriverAPI = {
   .InitScreen      = ffbInitScreen,
   .DestroyScreen   = ffbDestroyScreen,
   .CreateContext   = ffbCreateContext,
   .DestroyContext  = ffbDestroyContext,
   .CreateBuffer    = ffbCreateBuffer,
   .DestroyBuffer   = ffbDestroyBuffer,
   .SwapBuffers     = ffbSwapBuffers,
   .MakeCurrent     = ffbMakeCurrent,
   .UnbindContext   = ffbUnbindContext,
   .GetSwapInfo     = NULL,
   .GetDrawableMSC  = NULL,
   .WaitForMSC      = NULL,
   .WaitForSBC      = NULL,
   .SwapBuffersMSC  = NULL
};