via_context.c

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

    /* Parse configuration files.
     */
    driParseConfigFiles (&vmesa->optionCache, &viaScreen->optionCache,
			 sPriv->myNum, "unichrome");

    /* pick back buffer */
    vmesa->hasBack = visual->doubleBufferMode;

    switch(visual->depthBits) {
    case 0:			
       vmesa->hasDepth = GL_FALSE;
       vmesa->depthBits = 0; 
       vmesa->depth_max = 1.0;
       break;
    case 16:
       vmesa->hasDepth = GL_TRUE;
       vmesa->depthBits = visual->depthBits;
       vmesa->have_hw_stencil = GL_FALSE;
       vmesa->depth_max = (GLfloat)0xffff;
       vmesa->depth_clear_mask = 0xf << 28;
       vmesa->ClearDepth = 0xffff;
       vmesa->polygon_offset_scale = 1.0 / vmesa->depth_max;
       break;
    case 24:
       vmesa->hasDepth = GL_TRUE;
       vmesa->depthBits = visual->depthBits;
       vmesa->depth_max = (GLfloat) 0xffffff;
       vmesa->depth_clear_mask = 0xe << 28;
       vmesa->ClearDepth = 0xffffff00;

       assert(visual->haveStencilBuffer);
       assert(visual->stencilBits == 8);

       vmesa->have_hw_stencil = GL_TRUE;
       vmesa->stencilBits = visual->stencilBits;
       vmesa->stencil_clear_mask = 0x1 << 28;
       vmesa->polygon_offset_scale = 2.0 / vmesa->depth_max;
       break;
    case 32:
       vmesa->hasDepth = GL_TRUE;
       vmesa->depthBits = visual->depthBits;
       assert(!visual->haveStencilBuffer);
       vmesa->have_hw_stencil = GL_FALSE;
       vmesa->depth_max = (GLfloat)0xffffffff;
       vmesa->depth_clear_mask = 0xf << 28;
       vmesa->ClearDepth = 0xffffffff;
       vmesa->polygon_offset_scale = 2.0 / vmesa->depth_max;
       break;
    default:
       assert(0); 
       break;
    }

    make_empty_list(&vmesa->freed_tex_buffers);
    make_empty_list(&vmesa->tex_image_list[VIA_MEM_VIDEO]);
    make_empty_list(&vmesa->tex_image_list[VIA_MEM_AGP]);
    make_empty_list(&vmesa->tex_image_list[VIA_MEM_SYSTEM]);

    _mesa_init_driver_functions(&functions);
    viaInitTextureFuncs(&functions);

    /* Allocate the Mesa context */
    if (sharedContextPrivate)
        shareCtx = ((struct via_context *) sharedContextPrivate)->glCtx;
    else
        shareCtx = NULL;

    vmesa->glCtx = _mesa_create_context(visual, shareCtx, &functions,
					(void*) vmesa);
    
    vmesa->shareCtx = shareCtx;
    
    if (!vmesa->glCtx) {
        FREE(vmesa);
        return GL_FALSE;
    }
    driContextPriv->driverPrivate = vmesa;

    ctx = vmesa->glCtx;

    if (driQueryOptionb(&vmesa->optionCache, "excess_mipmap"))
        ctx->Const.MaxTextureLevels = 11;
    else
        ctx->Const.MaxTextureLevels = 10;

    ctx->Const.MaxTextureUnits = 2;
    ctx->Const.MaxTextureImageUnits = ctx->Const.MaxTextureUnits;
    ctx->Const.MaxTextureCoordUnits = ctx->Const.MaxTextureUnits;

    ctx->Const.MinLineWidth = 1.0;
    ctx->Const.MinLineWidthAA = 1.0;
    ctx->Const.MaxLineWidth = 1.0;
    ctx->Const.MaxLineWidthAA = 1.0;
    ctx->Const.LineWidthGranularity = 1.0;

    ctx->Const.MinPointSize = 1.0;
    ctx->Const.MinPointSizeAA = 1.0;
    ctx->Const.MaxPointSize = 1.0;
    ctx->Const.MaxPointSizeAA = 1.0;
    ctx->Const.PointSizeGranularity = 1.0;

    ctx->Driver.GetString = viaGetString;

    ctx->DriverCtx = (void *)vmesa;
    vmesa->glCtx = ctx;

    /* Initialize the software rasterizer and helper modules.
     */
    _swrast_CreateContext(ctx);
    _vbo_CreateContext(ctx);
    _tnl_CreateContext(ctx);
    _swsetup_CreateContext(ctx);

    /* Install the customized pipeline:
     */
    _tnl_destroy_pipeline(ctx);
    _tnl_install_pipeline(ctx, via_pipeline);

    /* Configure swrast and T&L to match hardware characteristics:
     */
    _swrast_allow_pixel_fog(ctx, GL_FALSE);
    _swrast_allow_vertex_fog(ctx, GL_TRUE);
    _tnl_allow_pixel_fog(ctx, GL_FALSE);
    _tnl_allow_vertex_fog(ctx, GL_TRUE);

    vmesa->hHWContext = driContextPriv->hHWContext;
    vmesa->driFd = sPriv->fd;
    vmesa->driHwLock = &sPriv->pSAREA->lock;

    vmesa->viaScreen = viaScreen;
    vmesa->driScreen = sPriv;
    vmesa->sarea = saPriv;

    vmesa->renderIndex = ~0;
    vmesa->setupIndex = ~0;
    vmesa->hwPrimitive = GL_POLYGON+1;

    /* KW: Hardwire this.  Was previously set bogusly in
     * viaCreateBuffer.  Needs work before PBUFFER can be used:
     */
    vmesa->drawType = GLX_WINDOW_BIT;


    _math_matrix_ctr(&vmesa->ViewportMatrix);

    /* Do this early, before VIA_FLUSH_DMA can be called:
     */
    if (!AllocateDmaBuffer(vmesa)) {
	fprintf(stderr ,"AllocateDmaBuffer fail\n");
	FreeBuffer(vmesa);
        FREE(vmesa);
        return GL_FALSE;
    }

    /* Allocate a small piece of fb memory for synchronization:
     */
    vmesa->breadcrumb.bpp = 32;
    vmesa->breadcrumb.pitch = buffer_align( 64 ) << 2;
    vmesa->breadcrumb.size = vmesa->breadcrumb.pitch;

    if (!via_alloc_draw_buffer(vmesa, &vmesa->breadcrumb)) {
        fprintf(stderr ,"AllocateDmaBuffer fail\n");
        FreeBuffer(vmesa);
        FREE(vmesa);
        return GL_FALSE;
    }

    driInitExtensions( ctx, card_extensions, GL_TRUE );
    viaInitStateFuncs(ctx);
    viaInitTriFuncs(ctx);
    viaInitSpanFuncs(ctx);
    viaInitIoctlFuncs(ctx);
    viaInitState(ctx);
        
    if (getenv("VIA_DEBUG"))
       VIA_DEBUG = driParseDebugString( getenv( "VIA_DEBUG" ),
					debug_control );

    if (getenv("VIA_NO_RAST") ||
        driQueryOptionb(&vmesa->optionCache, "no_rast"))
       FALLBACK(vmesa, VIA_FALLBACK_USER_DISABLE, 1);

    if (getenv("VIA_PAGEFLIP"))
       vmesa->allowPageFlip = 1;

    (*sPriv->systemTime->getUST)( &vmesa->swap_ust );


    vmesa->regMMIOBase = (GLuint *)((unsigned long)viaScreen->reg);
    vmesa->pnGEMode = (GLuint *)((unsigned long)viaScreen->reg + 0x4);
    vmesa->regEngineStatus = (GLuint *)((unsigned long)viaScreen->reg + 0x400);
    vmesa->regTranSet = (GLuint *)((unsigned long)viaScreen->reg + 0x43C);
    vmesa->regTranSpace = (GLuint *)((unsigned long)viaScreen->reg + 0x440);
    vmesa->agpBase = viaScreen->agpBase;


    return GL_TRUE;
}

void
viaDestroyContext(__DRIcontextPrivate *driContextPriv)
{
    GET_CURRENT_CONTEXT(ctx);
    struct via_context *vmesa =
       (struct via_context *)driContextPriv->driverPrivate;
    struct via_context *current = ctx ? VIA_CONTEXT(ctx) : NULL;

    assert(vmesa); /* should never be null */

    if (vmesa->driDrawable) {
       viaWaitIdle(vmesa, GL_FALSE);

       if (vmesa->doPageFlip) {
	  LOCK_HARDWARE(vmesa);
	  if (vmesa->pfCurrentOffset != 0) {
	     fprintf(stderr, "%s - reset pf\n", __FUNCTION__);
	     viaResetPageFlippingLocked(vmesa);
	  }
	  UNLOCK_HARDWARE(vmesa);
       }
    }

    /* check if we're deleting the currently bound context */
    if (vmesa == current) {
      VIA_FLUSH_DMA(vmesa);
      _mesa_make_current(NULL, NULL, NULL);
    }

    _swsetup_DestroyContext(vmesa->glCtx);
    _tnl_DestroyContext(vmesa->glCtx);
    _vbo_DestroyContext(vmesa->glCtx);
    _swrast_DestroyContext(vmesa->glCtx);
    /* free the Mesa context */
    _mesa_destroy_context(vmesa->glCtx);
    /* release our data */
    FreeBuffer(vmesa);

    assert (is_empty_list(&vmesa->tex_image_list[VIA_MEM_AGP]));
    assert (is_empty_list(&vmesa->tex_image_list[VIA_MEM_VIDEO]));
    assert (is_empty_list(&vmesa->tex_image_list[VIA_MEM_SYSTEM]));
    assert (is_empty_list(&vmesa->freed_tex_buffers));

    driDestroyOptionCache(&vmesa->optionCache);

    FREE(vmesa);
}


void viaXMesaWindowMoved(struct via_context *vmesa)
{
   __DRIdrawablePrivate *const drawable = vmesa->driDrawable;
   __DRIdrawablePrivate *const readable = vmesa->driReadable;
   struct via_renderbuffer * draw_buffer;
   struct via_renderbuffer * read_buffer;
   GLuint bytePerPixel = vmesa->viaScreen->bitsPerPixel >> 3;

   if (!drawable)
      return;

   draw_buffer =  (struct via_renderbuffer *) drawable->driverPrivate;
   read_buffer =  (struct via_renderbuffer *) readable->driverPrivate;
   
   switch (vmesa->glCtx->DrawBuffer->_ColorDrawBufferIndexes[0]) {
   case BUFFER_BACK_LEFT: 
      if (drawable->numBackClipRects == 0) {
	 vmesa->numClipRects = drawable->numClipRects;
	 vmesa->pClipRects = drawable->pClipRects;
      } 
      else {
	 vmesa->numClipRects = drawable->numBackClipRects;
	 vmesa->pClipRects = drawable->pBackClipRects;
      }
      break;
   case BUFFER_FRONT_LEFT:
      vmesa->numClipRects = drawable->numClipRects;
      vmesa->pClipRects = drawable->pClipRects;
      break;
   default:
      vmesa->numClipRects = 0;
      break;
   }

   if ((draw_buffer->drawW != drawable->w) 
       || (draw_buffer->drawH != drawable->h)) {
      calculate_buffer_parameters(vmesa, vmesa->glCtx->DrawBuffer,
				  drawable);
   }

   draw_buffer->drawX = drawable->x;
   draw_buffer->drawY = drawable->y;
   draw_buffer->drawW = drawable->w;
   draw_buffer->drawH = drawable->h;

   if (drawable != readable) {
      if ((read_buffer->drawW != readable->w) 
	  || (read_buffer->drawH != readable->h)) {
	 calculate_buffer_parameters(vmesa, vmesa->glCtx->ReadBuffer,
				     readable);
      }

      read_buffer->drawX = readable->x;
      read_buffer->drawY = readable->y;
      read_buffer->drawW = readable->w;
      read_buffer->drawH = readable->h;
   }

   vmesa->front.orig = (vmesa->front.offset + 
			draw_buffer->drawY * vmesa->front.pitch + 
			draw_buffer->drawX * bytePerPixel);

   vmesa->front.origMap = (vmesa->front.map + 
			draw_buffer->drawY * vmesa->front.pitch + 
			draw_buffer->drawX * bytePerPixel);

   vmesa->back.orig = (vmesa->back.offset +
			draw_buffer->drawY * vmesa->back.pitch +
			draw_buffer->drawX * bytePerPixel);

   vmesa->back.origMap = (vmesa->back.map +
			draw_buffer->drawY * vmesa->back.pitch +
			draw_buffer->drawX * bytePerPixel);

   vmesa->depth.orig = (vmesa->depth.offset +
			draw_buffer->drawY * vmesa->depth.pitch +
			draw_buffer->drawX * bytePerPixel);   

   vmesa->depth.origMap = (vmesa->depth.map +
			draw_buffer->drawY * vmesa->depth.pitch +
			draw_buffer->drawX * bytePerPixel);

   viaCalcViewport(vmesa->glCtx);
}

GLboolean
viaUnbindContext(__DRIcontextPrivate *driContextPriv)
{
    return GL_TRUE;
}

GLboolean
viaMakeCurrent(__DRIcontextPrivate *driContextPriv,
               __DRIdrawablePrivate *driDrawPriv,
               __DRIdrawablePrivate *driReadPriv)
{
    if (VIA_DEBUG & DEBUG_DRI) {
	fprintf(stderr, "driContextPriv = %016lx\n", (unsigned long)driContextPriv);
	fprintf(stderr, "driDrawPriv = %016lx\n", (unsigned long)driDrawPriv);    
	fprintf(stderr, "driReadPriv = %016lx\n", (unsigned long)driReadPriv);
    }	

    if (driContextPriv) {
        struct via_context *vmesa = 
	   (struct via_context *)driContextPriv->driverPrivate;
	GLcontext *ctx = vmesa->glCtx;
        struct gl_framebuffer *drawBuffer, *readBuffer;

        drawBuffer = (GLframebuffer *)driDrawPriv->driverPrivate;
        readBuffer = (GLframebuffer *)driReadPriv->driverPrivate;

       if ((vmesa->driDrawable != driDrawPriv)
	   || (vmesa->driReadable != driReadPriv)) {
	  if (driDrawPriv->swap_interval == (unsigned)-1) {
	     driDrawPriv->vblFlags =
		vmesa->viaScreen->irqEnabled ?
		driGetDefaultVBlankFlags(&vmesa->optionCache) :
		VBLANK_FLAG_NO_IRQ;

	     driDrawableInitVBlank(driDrawPriv);
	  }

	  vmesa->driDrawable = driDrawPriv;
	  vmesa->driReadable = driReadPriv;

	  if ((drawBuffer->Width != driDrawPriv->w) 
	      || (drawBuffer->Height != driDrawPriv->h)) {
	     _mesa_resize_framebuffer(ctx, drawBuffer,
				      driDrawPriv->w, driDrawPriv->h);
	     drawBuffer->Initialized = GL_TRUE;
	  }

	  if (!calculate_buffer_parameters(vmesa, drawBuffer, driDrawPriv)) {
	     return GL_FALSE;
	  }

	  if (driDrawPriv != driReadPriv) {
	     if ((readBuffer->Width != driReadPriv->w)
		 || (readBuffer->Height != driReadPriv->h)) {
		_mesa_resize_framebuffer(ctx, readBuffer,
					 driReadPriv->w, driReadPriv->h);
		readBuffer->Initialized = GL_TRUE;
	     }

	     if (!calculate_buffer_parameters(vmesa, readBuffer, driReadPriv)) {
		return GL_FALSE;
	     }
	  }
       }

        _mesa_make_current(vmesa->glCtx, drawBuffer, readBuffer);

	ctx->Driver.DrawBuffer( ctx, ctx->Color.DrawBuffer[0] );
	   
        viaXMesaWindowMoved(vmesa);
	ctx->Driver.Scissor(vmesa->glCtx,
			    vmesa->glCtx->Scissor.X,
			    vmesa->glCtx->Scissor.Y,
			    vmesa->glCtx->Scissor.Width,
			    vmesa->glCtx->Scissor.Height);
    }
    else {
        _mesa_make_current(NULL, NULL, NULL);
    }
        
    return GL_TRUE;
}

void viaGetLock(struct via_context *vmesa, GLuint flags)
{
    __DRIdrawablePrivate *dPriv = vmesa->driDrawable;
    __DRIscreenPrivate *sPriv = vmesa->driScreen;

    drmGetLock(vmesa->driFd, vmesa->hHWContext, flags);

    DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);
    if (dPriv != vmesa->driReadable) {
	DRI_VALIDATE_DRAWABLE_INFO(sPriv, vmesa->driReadable);
    }

    if (vmesa->sarea->ctxOwner != vmesa->hHWContext) {
       vmesa->sarea->ctxOwner = vmesa->hHWContext;
       vmesa->newEmitState = ~0;
    }

    if (vmesa->lastStamp != dPriv->lastStamp) {
       viaXMesaWindowMoved(vmesa);
       driUpdateFramebufferSize(vmesa->glCtx, dPriv);
       vmesa->newEmitState = ~0;
       vmesa->lastStamp = dPriv->lastStamp;
    }

    if (vmesa->doPageFlip &&
	vmesa->pfCurrentOffset != vmesa->sarea->pfCurrentOffset) {
       fprintf(stderr, "%s - reset pf\n", __FUNCTION__);
       viaResetPageFlippingLocked(vmesa);
    }
}


void
viaSwapBuffers(__DRIdrawablePrivate *drawablePrivate)
{
    __DRIdrawablePrivate *dPriv = (__DRIdrawablePrivate *)drawablePrivate;

    if (dPriv && 
	dPriv->driContextPriv && 
	dPriv->driContextPriv->driverPrivate) {
        struct via_context *vmesa = 
	   (struct via_context *)dPriv->driContextPriv->driverPrivate;
        GLcontext *ctx = vmesa->glCtx;

	_mesa_notifySwapBuffers(ctx);

        if (ctx->Visual.doubleBufferMode) {
            if (vmesa->doPageFlip) {
                viaPageFlip(dPriv);
            }
            else {
                viaCopyBuffer(dPriv);
            }
        }
	else
	    VIA_FLUSH_DMA(vmesa);
    }
    else {
        _mesa_problem(NULL, "viaSwapBuffers: drawable has no context!\n");
    }
}