via_tris.c

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

   }

   if (setupIndex != vmesa->setupIndex) {
      vmesa->vertexSize = _tnl_install_attrs( ctx, 
					       vmesa->vertex_attrs, 
					       vmesa->vertex_attr_count,
					       vmesa->ViewportMatrix.m, 0 );
      vmesa->vertexSize >>= 2;
      vmesa->setupIndex = setupIndex;
      vmesa->regCmdB &= ~HC_HVPMSK_MASK;
      vmesa->regCmdB |= regCmdB;

      if (vmesa->ptexHack) 
	 vmesa->hwVertexSize = vmesa->vertexSize - 1;
      else
	 vmesa->hwVertexSize = vmesa->vertexSize;
   }
}




/* Check if projective texture coordinates are used and if we can fake
 * them. Fallback to swrast if we can't. Returns GL_TRUE if projective
 * texture coordinates must be faked, GL_FALSE otherwise.
 */
static GLboolean viaCheckPTexHack( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &tnl->vb;
   DECLARE_RENDERINPUTS(index_bitset);
   GLboolean fallback = GL_FALSE;
   GLboolean ptexHack = GL_FALSE;

   RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );

   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX0 ) && VB->TexCoordPtr[0]->size == 4) {
      if (!RENDERINPUTS_TEST_RANGE( index_bitset, _TNL_ATTRIB_TEX1, _TNL_LAST_TEX ))
	 ptexHack = GL_TRUE; 
      else
	 fallback = GL_TRUE;
   }
   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX1 ) && VB->TexCoordPtr[1]->size == 4)
      fallback = GL_TRUE;

   FALLBACK(VIA_CONTEXT(ctx), VIA_FALLBACK_PROJ_TEXTURE, fallback);
   return ptexHack;
}




/**********************************************************************/
/*                 High level hooks for t_vb_render.c                 */
/**********************************************************************/


static void viaRenderStart(GLcontext *ctx)
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;

   {
      GLboolean ptexHack = viaCheckPTexHack( ctx );
      if (ptexHack != vmesa->ptexHack) {
	 vmesa->ptexHack = ptexHack;
	 vmesa->newRenderState |= _VIA_NEW_RENDERSTATE;
      }
   }

   if (vmesa->newState) {
      vmesa->newRenderState |= vmesa->newState;
      viaValidateState( ctx );
   }

   if (vmesa->Fallback) {
      tnl->Driver.Render.Start(ctx);
      return;
   }

   if (vmesa->newRenderState) {
      viaChooseVertexState(ctx);
      viaChooseRenderState(ctx);
      vmesa->newRenderState = 0;
   }

   /* Important:
    */
   VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
}

static void viaRenderFinish(GLcontext *ctx)
{
   VIA_FINISH_PRIM(VIA_CONTEXT(ctx));
}


/* System to flush dma and emit state changes based on the rasterized
 * primitive.
 */
void viaRasterPrimitive(GLcontext *ctx,
			GLenum glprim,
			GLenum hwprim)
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);
   GLuint regCmdB;
   RING_VARS;

   if (VIA_DEBUG & DEBUG_PRIMS) 
      fprintf(stderr, "%s: %s/%s/%s\n", 
	      __FUNCTION__, _mesa_lookup_enum_by_nr(glprim),
	      _mesa_lookup_enum_by_nr(hwprim),
	      _mesa_lookup_enum_by_nr(ctx->Light.ShadeModel));

   assert (!vmesa->newState);

   vmesa->renderPrimitive = glprim;

   if (hwprim != vmesa->hwPrimitive ||
       ctx->Light.ShadeModel != vmesa->hwShadeModel) {

      VIA_FINISH_PRIM(vmesa);

      /* Ensure no wrapping inside this function  */    
      viaCheckDma( vmesa, 1024 );	

      if (vmesa->newEmitState) {
	 viaEmitState(vmesa);
      }
       
      vmesa->regCmdA_End = HC_ACMD_HCmdA;

      if (ctx->Light.ShadeModel == GL_SMOOTH) {
	 vmesa->regCmdA_End |= HC_HShading_Gouraud;
      }
      
      vmesa->hwShadeModel = ctx->Light.ShadeModel;
      regCmdB = vmesa->regCmdB;

      switch (hwprim) {
      case GL_POINTS:
	 vmesa->regCmdA_End |= HC_HPMType_Point | HC_HVCycle_Full;
	 vmesa->regCmdA_End |= HC_HShading_Gouraud; /* always Gouraud 
						       shade points?!? */
	 break;
      case GL_LINES:
	 vmesa->regCmdA_End |= HC_HPMType_Line | HC_HVCycle_Full;
         regCmdB |= HC_HLPrst_MASK;
	 if (ctx->Light.ShadeModel == GL_FLAT)
            vmesa->regCmdA_End |= HC_HShading_FlatB; 
	 break;
      case GL_LINE_LOOP:
      case GL_LINE_STRIP:
	 vmesa->regCmdA_End |= HC_HPMType_Line | HC_HVCycle_AFP |
	    HC_HVCycle_AB | HC_HVCycle_NewB;
	 regCmdB |= HC_HVCycle_AB | HC_HVCycle_NewB | HC_HLPrst_MASK;
	 if (ctx->Light.ShadeModel == GL_FLAT)
            vmesa->regCmdA_End |= HC_HShading_FlatB; 
	 break;
      case GL_TRIANGLES:
	 vmesa->regCmdA_End |= HC_HPMType_Tri | HC_HVCycle_Full;
	 if (ctx->Light.ShadeModel == GL_FLAT)
            vmesa->regCmdA_End |= HC_HShading_FlatC; 
	 break;
      case GL_TRIANGLE_STRIP:
	 vmesa->regCmdA_End |= HC_HPMType_Tri | HC_HVCycle_AFP |
	    HC_HVCycle_AC | HC_HVCycle_BB | HC_HVCycle_NewC;
	 regCmdB |= HC_HVCycle_AA | HC_HVCycle_BC | HC_HVCycle_NewC;
	 if (ctx->Light.ShadeModel == GL_FLAT)
            vmesa->regCmdA_End |= HC_HShading_FlatC; 
	 break;
      case GL_TRIANGLE_FAN:
	 vmesa->regCmdA_End |= HC_HPMType_Tri | HC_HVCycle_AFP |
	    HC_HVCycle_AA | HC_HVCycle_BC | HC_HVCycle_NewC;
	 regCmdB |= HC_HVCycle_AA | HC_HVCycle_BC | HC_HVCycle_NewC;
	 if (ctx->Light.ShadeModel == GL_FLAT)
            vmesa->regCmdA_End |= HC_HShading_FlatC; 
	 break;
      case GL_QUADS:
	 abort();
	 return;
      case GL_QUAD_STRIP:
	 abort();
	 return;
      case GL_POLYGON:
	 vmesa->regCmdA_End |= HC_HPMType_Tri | HC_HVCycle_AFP |
	    HC_HVCycle_AA | HC_HVCycle_BC | HC_HVCycle_NewC;
	 regCmdB |= HC_HVCycle_AA | HC_HVCycle_BC | HC_HVCycle_NewC;
	 if (ctx->Light.ShadeModel == GL_FLAT)
            vmesa->regCmdA_End |= HC_HShading_FlatC; 
	 break;                          
      default:
	 abort();
	 return;
      }
    
/*     assert((vmesa->dmaLow & 0x4) == 0); */

      if (vmesa->dmaCliprectAddr == ~0) {
	 if (VIA_DEBUG & DEBUG_DMA) 
	    fprintf(stderr, "reserve cliprect space at %x\n", vmesa->dmaLow);
	 vmesa->dmaCliprectAddr = vmesa->dmaLow;
	 BEGIN_RING(8);
	 OUT_RING( HC_HEADER2 );    
	 OUT_RING( (HC_ParaType_NotTex << 16) );
	 OUT_RING( 0xCCCCCCCC );
	 OUT_RING( 0xCCCCCCCC );
	 OUT_RING( 0xCCCCCCCC );
	 OUT_RING( 0xCCCCCCCC );
	 OUT_RING( 0xCCCCCCCC );
	 OUT_RING( 0xCCCCCCCC );
	 ADVANCE_RING();
      }

      assert(vmesa->dmaLastPrim == 0);

      BEGIN_RING(8);
      OUT_RING( HC_HEADER2 );    
      OUT_RING( (HC_ParaType_NotTex << 16) );
      OUT_RING( 0xCCCCCCCC );
      OUT_RING( 0xDDDDDDDD );

      OUT_RING( HC_HEADER2 );    
      OUT_RING( (HC_ParaType_CmdVdata << 16) );
      OUT_RING( regCmdB );
      OUT_RING( vmesa->regCmdA_End );
      ADVANCE_RING();

      vmesa->hwPrimitive = hwprim;        
      vmesa->dmaLastPrim = vmesa->dmaLow;
   }
   else {
      assert(!vmesa->newEmitState);
   }
}

/* Callback for mesa:
 */
static void viaRenderPrimitive( GLcontext *ctx, GLuint prim )
{
   viaRasterPrimitive( ctx, prim, hwPrim[prim] );
}


void viaFinishPrimitive(struct via_context *vmesa)
{
   if (VIA_DEBUG & (DEBUG_DMA|DEBUG_PRIMS)) 
      fprintf(stderr, "%s\n", __FUNCTION__);

   if (!vmesa->dmaLastPrim || vmesa->dmaCliprectAddr == ~0) {
      assert(0);
   }
   else if (vmesa->dmaLow != vmesa->dmaLastPrim) {
      GLuint cmdA = (vmesa->regCmdA_End | HC_HPLEND_MASK | 
		     HC_HPMValidN_MASK | HC_HE3Fire_MASK); 
      RING_VARS;

      vmesa->dmaLastPrim = 0;

      /* KW: modified 0x1 to 0x4 below:
       */
      if ((vmesa->dmaLow & 0x4) || !vmesa->useAgp) {
	 BEGIN_RING_NOCHECK( 1 );
	 OUT_RING( cmdA );
	 ADVANCE_RING();
      }   
      else {      
	 BEGIN_RING_NOCHECK( 2 );
	 OUT_RING( cmdA );
	 OUT_RING( cmdA );
	 ADVANCE_RING();
      }   

      if (vmesa->dmaLow > VIA_DMA_HIGHWATER)
	 viaFlushDma( vmesa );
   }
   else {
      if (VIA_DEBUG & (DEBUG_DMA|DEBUG_PRIMS)) 
	 fprintf(stderr, "remove empty primitive\n");

      /* Remove the primitive header:
       */
      vmesa->dmaLastPrim = 0;
      vmesa->dmaLow -= 8 * sizeof(GLuint);

      /* Maybe remove the cliprect as well:
       */
      if (vmesa->dmaCliprectAddr == vmesa->dmaLow - 8 * sizeof(GLuint)) {
	 vmesa->dmaLow -= 8 * sizeof(GLuint);
	 vmesa->dmaCliprectAddr = ~0;
      }
   }

   vmesa->renderPrimitive = GL_POLYGON + 1;
   vmesa->hwPrimitive = GL_POLYGON + 1;
   vmesa->dmaLastPrim = 0;
}


/**********************************************************************/
/*           Transition to/from hardware rasterization.               */
/**********************************************************************/


void viaFallback(struct via_context *vmesa, GLuint bit, GLboolean mode)
{
    GLcontext *ctx = vmesa->glCtx;
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    GLuint oldfallback = vmesa->Fallback;
    
    if (mode) {
        vmesa->Fallback |= bit;
        if (oldfallback == 0) {
	    VIA_FLUSH_DMA(vmesa);

 	    if (VIA_DEBUG & DEBUG_FALLBACKS) 
	       fprintf(stderr, "ENTER FALLBACK %x\n", bit);

            _swsetup_Wakeup(ctx);
            vmesa->renderIndex = ~0;
        }
    }
    else {
        vmesa->Fallback &= ~bit;
        if (oldfallback == bit) {
	    _swrast_flush( ctx );

 	    if (VIA_DEBUG & DEBUG_FALLBACKS) 
	       fprintf(stderr, "LEAVE FALLBACK %x\n", bit);

	    tnl->Driver.Render.Start = viaRenderStart;
            tnl->Driver.Render.PrimitiveNotify = viaRenderPrimitive;
            tnl->Driver.Render.Finish = viaRenderFinish;

	    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
	    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
	    tnl->Driver.Render.Interp = _tnl_interp;
    	    tnl->Driver.Render.ResetLineStipple = viaResetLineStipple;

	    _tnl_invalidate_vertex_state( ctx, ~0 );
	    _tnl_invalidate_vertices( ctx, ~0 );
	    _tnl_install_attrs( ctx, 
				vmesa->vertex_attrs, 
				vmesa->vertex_attr_count,
				vmesa->ViewportMatrix.m, 0 ); 

            vmesa->newState |= (_VIA_NEW_RENDERSTATE|_VIA_NEW_VERTEX);
        }
    }    
}

static void viaRunPipeline( GLcontext *ctx )
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);

   if (vmesa->newState) {
      vmesa->newRenderState |= vmesa->newState;
      viaValidateState( ctx );
   }

   _tnl_run_pipeline( ctx );
}


/**********************************************************************/
/*                            Initialization.                         */
/**********************************************************************/


void viaInitTriFuncs(GLcontext *ctx)
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    static int firsttime = 1;

    if (firsttime) {
        init_rast_tab();
        firsttime = 0;
    }

    tnl->Driver.RunPipeline = viaRunPipeline;
    tnl->Driver.Render.Start = viaRenderStart;
    tnl->Driver.Render.Finish = viaRenderFinish;
    tnl->Driver.Render.PrimitiveNotify = viaRenderPrimitive;
    tnl->Driver.Render.ResetLineStipple = viaResetLineStipple;
    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
    tnl->Driver.Render.Interp = _tnl_interp;

    _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12, 
			(6 + 2*ctx->Const.MaxTextureUnits) * sizeof(GLfloat) );
   
    vmesa->verts = (GLubyte *)tnl->clipspace.vertex_buf;

}