i810texstate.c

mesa-6.5-minigui源码

       * done in stage zero and writes to MC_DEST_ACCUMULATOR.  The
       * (arg1*(1-arg2)) portion is done in stage 1, and the final stage is
       * (MC_ARG1_ACCUMULATOR | MC_ARG2_CURRENT_COLOR | MC_OP_ADD).
       * 
       * It can also be done without using the accumulator by rearranging
       * the equation as (arg1 + (arg2 * (arg0 - arg1))).  Too bad the i810
       * doesn't support the MODULATE_AND_ADD mode that the i830 supports.
       * If it did, the interpolate could be done in only two stages.
       */
	 
      if ( (color_arg[2] & MC_ARG_INVERT) != 0 ) {
	 unsigned temp = color_arg[0];

	 color_arg[0] = color_arg[1];
	 color_arg[1] = temp;
	 color_arg[2] &= ~MC_ARG_INVERT;
      }

      switch (color_arg[2]) {
      case (MC_ARG_ONE):
      case (MC_ARG_ONE | MC_ARG_REPLICATE_ALPHA):
	 color_combine = MC_OP_ARG1;
	 color_arg[1] = MC_ARG_ONE;
	 break;

      case (MC_ARG_COLOR_FACTOR):
	 return GL_FALSE;

      case (MC_ARG_COLOR_FACTOR | MC_ARG_REPLICATE_ALPHA):
	 color_combine = MC_OP_LIN_BLEND_ALPHA_FACTOR;
	 break;

      case (MC_ARG_ITERATED_COLOR):
	 return GL_FALSE;

      case (MC_ARG_ITERATED_COLOR | MC_ARG_REPLICATE_ALPHA):
	 color_combine = MC_OP_LIN_BLEND_ITER_ALPHA;
	 break;

      case (MC_ARG_SPECULAR_COLOR):
      case (MC_ARG_SPECULAR_COLOR | MC_ARG_REPLICATE_ALPHA):
	 return GL_FALSE;

      case (MC_ARG_TEX0_COLOR):
	 color_combine = MC_OP_LIN_BLEND_TEX0_COLOR;
	 break;

      case (MC_ARG_TEX0_COLOR | MC_ARG_REPLICATE_ALPHA):
	 color_combine = MC_OP_LIN_BLEND_TEX0_ALPHA;
	 break;

      case (MC_ARG_TEX1_COLOR):
	 color_combine = MC_OP_LIN_BLEND_TEX1_COLOR;
	 break;

      case (MC_ARG_TEX1_COLOR | MC_ARG_REPLICATE_ALPHA):
	 color_combine = MC_OP_LIN_BLEND_TEX1_ALPHA;
	 break;

      default:
	 return GL_FALSE;
      }
      break;

   default:
      return GL_FALSE;
   }

   
   switch ( texUnit->_CurrentCombine->ModeA ) {
   case GL_REPLACE:
      alpha_combine = MA_OP_ARG1;
      break;
   case GL_MODULATE:
      alpha_combine = MA_OP_MODULATE + Ashift;
      Ashift = 0;
      break;
   case GL_ADD:
      alpha_combine = MA_OP_ADD;
      break;
   case GL_ADD_SIGNED:
      alpha_combine = MA_OP_ADD_SIGNED;
      break;
   case GL_SUBTRACT:
      alpha_combine = MA_OP_SUBTRACT;
      break;
   case GL_INTERPOLATE:
      if ( (alpha_arg[2] & MA_ARG_INVERT) != 0 ) {
	 unsigned temp = alpha_arg[0];

	 alpha_arg[0] = alpha_arg[1];
	 alpha_arg[1] = temp;
	 alpha_arg[2] &= ~MA_ARG_INVERT;
      }

      switch (alpha_arg[2]) {
      case MA_ARG_ONE:
	 alpha_combine = MA_OP_ARG1;
	 alpha_arg[1] = MA_ARG_ITERATED_ALPHA;
	 break;

      case MA_ARG_ALPHA_FACTOR:
	 alpha_combine = MA_OP_LIN_BLEND_ALPHA_FACTOR;
	 break;

      case MA_ARG_ITERATED_ALPHA:
	 alpha_combine = MA_OP_LIN_BLEND_ITER_ALPHA;
	 break;

      case MA_ARG_TEX0_ALPHA:
	 alpha_combine = MA_OP_LIN_BLEND_TEX0_ALPHA;
	 break;

      case MA_ARG_TEX1_ALPHA:
	 alpha_combine = MA_OP_LIN_BLEND_TEX1_ALPHA;
	 break;

      default:
	 return GL_FALSE;
      }
      break;

   default:
      return GL_FALSE;
   }


   color_combine |= GFX_OP_MAP_COLOR_STAGES | (*color_stage << MC_STAGE_SHIFT)
     | MC_UPDATE_DEST | MC_DEST_CURRENT
     | MC_UPDATE_ARG1 | (color_arg[0] << MC_ARG1_SHIFT)
     | MC_UPDATE_ARG2 | (color_arg[1] << MC_ARG2_SHIFT)
     | MC_UPDATE_OP;

   alpha_combine |= GFX_OP_MAP_ALPHA_STAGES | (*alpha_stage << MA_STAGE_SHIFT)
     | MA_UPDATE_ARG1 | (alpha_arg[0] << MA_ARG1_SHIFT)
     | MA_UPDATE_ARG2 | (alpha_arg[1] << MA_ARG2_SHIFT)
     | MA_UPDATE_OP;

   set_color_stage( color_combine, *color_stage, imesa );
   set_alpha_stage( alpha_combine, *alpha_stage, imesa );
   (*color_stage)++;
   (*alpha_stage)++;


   /* Step 3:
    * Apply the scale factor.
    */
   /* The only operation where the i810 directly supports adding a post-
    * scale factor is modulate.  For all the other modes the post-scale is
    * emulated by inserting and extra modulate stage.  For the modulate
    * case, the scaling is handled above when color_combine / alpha_combine
    * are initially set.
    */

   if ( RGBshift != 0 ) {
      const unsigned color_scale = GFX_OP_MAP_COLOR_STAGES
	| (*color_stage << MC_STAGE_SHIFT)
	| MC_UPDATE_DEST | MC_DEST_CURRENT
	| MC_UPDATE_ARG1 | (MC_ARG_CURRENT_COLOR << MC_ARG1_SHIFT)
	| MC_UPDATE_ARG2 | (MC_ARG_ONE           << MC_ARG2_SHIFT)
	| MC_UPDATE_OP   | (MC_OP_MODULATE + RGBshift);

      if ( *color_stage >= 3 ) {
	 return GL_FALSE;
      }

      set_color_stage( color_scale, *color_stage, imesa );
      (*color_stage)++;
   }

   
   if ( Ashift != 0 ) {
      const unsigned alpha_scale = GFX_OP_MAP_ALPHA_STAGES
	| (*alpha_stage << MA_STAGE_SHIFT)
	| MA_UPDATE_ARG1 | (MA_ARG_CURRENT_ALPHA << MA_ARG1_SHIFT)
	| MA_UPDATE_ARG2 | (MA_ARG_ONE           << MA_ARG2_SHIFT)
	| MA_UPDATE_OP   | (MA_OP_MODULATE + Ashift);

      if ( *alpha_stage >= 3 ) {
	 return GL_FALSE;
      }

      set_alpha_stage( alpha_scale, *alpha_stage, imesa );
      (*alpha_stage)++;
   }

   return GL_TRUE;
}


/**
 * Update hardware state for a texture unit.
 *
 * \todo
 * 1D textures should be supported!  Just use a 2D texture with the second
 * texture coordinate value fixed at 0.0.
 */
static void i810UpdateTexUnit( GLcontext *ctx, GLuint unit, 
			      int * next_color_stage, int * next_alpha_stage )
{
   i810ContextPtr imesa = I810_CONTEXT(ctx);
   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];

   if ( (texUnit->_ReallyEnabled == TEXTURE_2D_BIT)
	|| (texUnit->_ReallyEnabled == 0) ) {
      if (texUnit->_ReallyEnabled != 0) {
	 struct gl_texture_object *tObj = texUnit->_Current;
	 i810TextureObjectPtr t = (i810TextureObjectPtr)tObj->DriverData;

	 if (tObj->Image[0][tObj->BaseLevel]->Border > 0) {
	    FALLBACK( imesa, I810_FALLBACK_TEXTURE, GL_TRUE );
	    return;
	 }


	 /* Upload teximages (not pipelined)
	  */
	 if (t->base.dirty_images[0]) {
	    I810_FIREVERTICES(imesa);
	    i810SetTexImages( imesa, tObj );
	    if (!t->base.memBlock) {
	       FALLBACK( imesa, I810_FALLBACK_TEXTURE, GL_TRUE );
	       return;
	    }
	 }


	 /* Update state if this is a different texture object to last
	  * time.
	  */
	 if (imesa->CurrentTexObj[unit] != t) {
	    I810_STATECHANGE(imesa, (I810_UPLOAD_TEX0<<unit));
	    imesa->CurrentTexObj[unit] = t;
	    t->base.bound |= (1U << unit);

	    /* XXX: should be locked */
	    driUpdateTextureLRU( (driTextureObject *) t );
	 }
      
	 /* Update texture environment if texture object image format or 
	  * texture environment state has changed.
	  */

	 imesa->TexEnvImageFmt[unit] = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
      }
      else {
	 imesa->CurrentTexObj[unit] = 0;
	 imesa->TexEnvImageFmt[unit] = 0;	
	 imesa->dirty &= ~(I810_UPLOAD_TEX0<<unit); 
      }
      
      if (!i810UpdateTexEnvCombine( ctx, unit, 
				    next_color_stage, next_alpha_stage )) {
	 FALLBACK( imesa, I810_FALLBACK_TEXTURE, GL_TRUE );
      }
   }
   else if (texUnit->_ReallyEnabled) {
      FALLBACK( imesa, I810_FALLBACK_TEXTURE, GL_TRUE );
   }

   return;
}


void i810UpdateTextureState( GLcontext *ctx )
{
   static const unsigned color_pass[3] = {
      GFX_OP_MAP_COLOR_STAGES | MC_STAGE_0 | MC_UPDATE_DEST | MC_DEST_CURRENT
	| MC_UPDATE_ARG1 | (MC_ARG_ITERATED_COLOR << MC_ARG1_SHIFT)
	| MC_UPDATE_ARG2 | (MC_ARG_ONE            << MC_ARG2_SHIFT)
	| MC_UPDATE_OP   | MC_OP_ARG1,
      GFX_OP_MAP_COLOR_STAGES | MC_STAGE_1 | MC_UPDATE_DEST | MC_DEST_CURRENT
	| MC_UPDATE_ARG1 | (MC_ARG_CURRENT_COLOR  << MC_ARG1_SHIFT)
	| MC_UPDATE_ARG2 | (MC_ARG_ONE            << MC_ARG2_SHIFT)
	| MC_UPDATE_OP   | MC_OP_ARG1,
      GFX_OP_MAP_COLOR_STAGES | MC_STAGE_2 | MC_UPDATE_DEST | MC_DEST_CURRENT
	| MC_UPDATE_ARG1 | (MC_ARG_CURRENT_COLOR  << MC_ARG1_SHIFT)
	| MC_UPDATE_ARG2 | (MC_ARG_ONE            << MC_ARG2_SHIFT)
	| MC_UPDATE_OP   | MC_OP_ARG1
   };
   static const unsigned alpha_pass[3] = {
      GFX_OP_MAP_ALPHA_STAGES | MA_STAGE_0
	| MA_UPDATE_ARG1 | (MA_ARG_ITERATED_ALPHA << MA_ARG1_SHIFT)
	| MA_UPDATE_ARG2 | (MA_ARG_ITERATED_ALPHA << MA_ARG2_SHIFT)
	| MA_UPDATE_OP   | MA_OP_ARG1,
      GFX_OP_MAP_ALPHA_STAGES | MA_STAGE_1
	| MA_UPDATE_ARG1 | (MA_ARG_CURRENT_ALPHA  << MA_ARG1_SHIFT)
	| MA_UPDATE_ARG2 | (MA_ARG_CURRENT_ALPHA  << MA_ARG2_SHIFT)
	| MA_UPDATE_OP   | MA_OP_ARG1,
      GFX_OP_MAP_ALPHA_STAGES | MA_STAGE_2
	| MA_UPDATE_ARG1 | (MA_ARG_CURRENT_ALPHA  << MA_ARG1_SHIFT)
	| MA_UPDATE_ARG2 | (MA_ARG_CURRENT_ALPHA  << MA_ARG2_SHIFT)
	| MA_UPDATE_OP   | MA_OP_ARG1
   };
   i810ContextPtr imesa = I810_CONTEXT(ctx);
   int next_color_stage = 0;
   int next_alpha_stage = 0;


   /*  fprintf(stderr, "%s\n", __FUNCTION__); */
   FALLBACK( imesa, I810_FALLBACK_TEXTURE, GL_FALSE );

   i810UpdateTexUnit( ctx, 0, & next_color_stage, & next_alpha_stage );
   i810UpdateTexUnit( ctx, 1, & next_color_stage, & next_alpha_stage );

   /* There needs to be at least one combine stage emitted that just moves
    * the incoming primary color to the current color register.  In addition,
    * there number be the same number of color and alpha stages emitted.
    * Finally, if there are less than 3 combine stages, a MC_OP_DISABLE stage
    * must be emitted.
    */

   while ( (next_color_stage == 0) ||
	   (next_color_stage < next_alpha_stage) ) {
      set_color_stage( color_pass[ next_color_stage ], next_color_stage,
		       imesa );
      next_color_stage++;
   }

   assert( next_color_stage <= 3 );

   while ( next_alpha_stage < next_color_stage ) {
      set_alpha_stage( alpha_pass[ next_alpha_stage ], next_alpha_stage,
		       imesa );
      next_alpha_stage++;
   }

   assert( next_alpha_stage <= 3 );
   assert( next_color_stage == next_alpha_stage );

   if ( next_color_stage < 3 ) {
      const unsigned color = GFX_OP_MAP_COLOR_STAGES
	| (next_color_stage << MC_STAGE_SHIFT)
	| MC_UPDATE_DEST | MC_DEST_CURRENT
	| MC_UPDATE_ARG1 | (MC_ARG_ONE << MC_ARG1_SHIFT)
	| MC_UPDATE_ARG2 | (MC_ARG_ONE << MC_ARG2_SHIFT)
	| MC_UPDATE_OP   | (MC_OP_DISABLE);

      const unsigned alpha = GFX_OP_MAP_ALPHA_STAGES
	| (next_color_stage << MC_STAGE_SHIFT)
	| MA_UPDATE_ARG1 | (MA_ARG_CURRENT_ALPHA << MA_ARG1_SHIFT)
	| MA_UPDATE_ARG2 | (MA_ARG_CURRENT_ALPHA << MA_ARG2_SHIFT)
	| MA_UPDATE_OP   | (MA_OP_ARG1);

      set_color_stage( color, next_color_stage, imesa );
      set_alpha_stage( alpha, next_alpha_stage, imesa );
   }
}