r128_texstate.c

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

	 case GL_COLOR_INDEX:
	 default:
	    return GL_FALSE;
	 }
	 break;
      }

      /* Rage 128 has to fake some cases of GL_BLEND, otherwise fallback
       * to software rendering.
       */
      if ( rmesa->blend_flags ) {
	 return GL_FALSE;
      }
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
	 switch ( rmesa->env_color & 0x00ffffff ) {
	 case 0x00000000:
	    combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0x00ffffff:
	    if ( unit == 0 ) {
	       combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			   ALPHA_COMB_MODULATE);	/* A = AfAt          */
	    } else {
	       combine |= (COLOR_COMB_ADD |		/* C = Cf+Ct         */
			   ALPHA_COMB_COPY_INPUT);	/* A = Af            */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_MODULATE);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 switch ( rmesa->env_color & 0x00ffffff ) {
	 case 0x00000000:
	    combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0x00ffffff:
	    if ( unit == 0 ) {
	       combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			   ALPHA_COMB_COPY_INPUT);	/* A = Af            */
	    } else {
	       combine |= (COLOR_COMB_ADD |		/* C = Cf+Ct         */
			   ALPHA_COMB_COPY_INPUT);	/* A = Af            */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_COPY_INPUT);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 break;
      case GL_ALPHA:
	 if ( unit == 0 ) {
	    combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 } else {
	    combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
			ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 }
	 break;
      case GL_INTENSITY:
	 switch ( rmesa->env_color & 0x00ffffff ) {
	 case 0x00000000:
	    combine |= COLOR_COMB_MODULATE_NTEX;	/* C = Cf(1-It)      */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0x00ffffff:
	    if ( unit == 0 ) {
	       combine |= COLOR_COMB_MODULATE_NTEX;	/* C = Cf(1-It)      */
	    } else {
	       combine |= COLOR_COMB_ADD;		/* C = Cf+It         */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_MODULATE);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 switch ( rmesa->env_color & 0xff000000 ) {
	 case 0x00000000:
	    combine |= ALPHA_COMB_MODULATE_NTEX;	/* A = Af(1-It)      */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0xff000000:
	    if ( unit == 0 ) {
	       combine |= ALPHA_COMB_MODULATE_NTEX;	/* A = Af(1-It)      */
	    } else {
	       combine |= ALPHA_COMB_ADD;		/* A = Af+It         */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_MODULATE);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_ADD:
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
	 combine |= (COLOR_COMB_ADD |			/* C = Cf+Ct         */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 combine |= (COLOR_COMB_ADD |			/* C = Cf+Ct         */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_INTENSITY:
	 combine |= (COLOR_COMB_ADD |			/* C = Cf+Ct         */
		     ALPHA_COMB_ADD);			/* A = Af+At         */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   default:
      return GL_FALSE;
   }

   if ( rmesa->tex_combine[unit] != combine ) {
     rmesa->tex_combine[unit] = combine;
     rmesa->dirty |= R128_UPLOAD_TEX0 << unit;
   }
   return GL_TRUE;
}

static void disable_tex( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );

   if ( rmesa->CurrentTexObj[unit] ) {
      rmesa->CurrentTexObj[unit]->base.bound &= ~(1 << unit);
      rmesa->CurrentTexObj[unit] = NULL;
   }

   rmesa->setup.tex_cntl_c &= ~(R128_TEXMAP_ENABLE << unit);
   rmesa->setup.tex_size_pitch_c &= ~(R128_TEX_SIZE_PITCH_MASK << 
				      (R128_SEC_TEX_SIZE_PITCH_SHIFT * unit));
   rmesa->dirty |= R128_UPLOAD_CONTEXT;

   /* If either texture unit is disabled, then multitexturing is not
    * happening.
    */

   rmesa->blend_flags &= ~R128_BLEND_MULTITEX;
}

static GLboolean enable_tex_2d( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const int source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
   const struct gl_texture_object *tObj = texUnit->_Current;
   r128TexObjPtr t = (r128TexObjPtr) tObj->DriverData;

   /* Need to load the 2d images associated with this unit.
    */
   if ( t->base.dirty_images[0] ) {
      /* FIXME: For Radeon, RADEON_FIREVERTICES is called here.  Should
       * FIXME: something similar be done for R128?
       */
      /*  FLUSH_BATCH( rmesa ); */

      r128SetTexImages( rmesa, tObj );
      r128UploadTexImages( rmesa, t );
      if ( !t->base.memBlock ) 
	  return GL_FALSE;
   }

   return GL_TRUE;
}

static GLboolean update_tex_common( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const int source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
   const struct gl_texture_object *tObj = texUnit->_Current;
   r128TexObjPtr t = (r128TexObjPtr) tObj->DriverData;


   /* Fallback if there's a texture border */
   if ( tObj->Image[0][tObj->BaseLevel]->Border > 0 ) {
      return GL_FALSE;
   }


   /* Update state if this is a different texture object to last
    * time.
    */
   if ( rmesa->CurrentTexObj[unit] != t ) {
      if ( rmesa->CurrentTexObj[unit] != NULL ) {
	 /* The old texture is no longer bound to this texture unit.
	  * Mark it as such.
	  */

	 rmesa->CurrentTexObj[unit]->base.bound &= 
	     ~(1UL << unit);
      }

      rmesa->CurrentTexObj[unit] = t;
      t->base.bound |= (1UL << unit);
      rmesa->dirty |= R128_UPLOAD_TEX0 << unit;

      driUpdateTextureLRU( (driTextureObject *) t ); /* XXX: should be locked! */
   }

   /* FIXME: We need to update the texture unit if any texture parameters have
    * changed, but this texture was already bound.  This could be changed to
    * work like the Radeon driver where the texture object has it's own
    * dirty state flags
    */
   rmesa->dirty |= R128_UPLOAD_TEX0 << unit;

   /* register setup */
   rmesa->setup.tex_size_pitch_c &= ~(R128_TEX_SIZE_PITCH_MASK << 
				      (R128_SEC_TEX_SIZE_PITCH_SHIFT * unit));

   if ( unit == 0 ) {
      rmesa->setup.tex_cntl_c       |= R128_TEXMAP_ENABLE;
      rmesa->setup.tex_size_pitch_c |= t->setup.tex_size_pitch << 0;
      rmesa->setup.scale_3d_cntl    &= ~R128_TEX_CACHE_SPLIT;
      t->setup.tex_cntl             &= ~R128_SEC_SELECT_SEC_ST;
   }
   else {
      rmesa->setup.tex_cntl_c       |= R128_SEC_TEXMAP_ENABLE;
      rmesa->setup.tex_size_pitch_c |= t->setup.tex_size_pitch << 16;
      rmesa->setup.scale_3d_cntl    |= R128_TEX_CACHE_SPLIT;
      t->setup.tex_cntl             |=  R128_SEC_SELECT_SEC_ST;

      /* If the second TMU is enabled, then multitexturing is happening.
       */
      if ( R128_IS_PLAIN( rmesa ) )
	  rmesa->blend_flags            |= R128_BLEND_MULTITEX;
   }

   rmesa->dirty |= R128_UPLOAD_CONTEXT;


   /* FIXME: The Radeon has some cached state so that it can avoid calling
    * FIXME: UpdateTextureEnv in some cases.  Is that possible here?
    */
   return r128UpdateTextureEnv( ctx, unit );
}

static GLboolean updateTextureUnit( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const int source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];


   if (texUnit->_ReallyEnabled & (TEXTURE_1D_BIT | TEXTURE_2D_BIT)) {
      return (enable_tex_2d( ctx, unit ) &&
	      update_tex_common( ctx, unit ));
   }
   else if ( texUnit->_ReallyEnabled ) {
      return GL_FALSE;
   }
   else {
      disable_tex( ctx, unit );
      return GL_TRUE;
   }
}


void r128UpdateTextureState( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLboolean ok;


   /* This works around a quirk with the R128 hardware.  If only OpenGL 
    * TEXTURE1 is enabled, then the hardware TEXTURE0 must be used.  The
    * hardware TEXTURE1 can ONLY be used when hardware TEXTURE0 is also used.
    */

   rmesa->tmu_source[0] = 0;
   rmesa->tmu_source[1] = 1;

   if ((ctx->Texture._EnabledUnits & 0x03) == 0x02) {
      /* only texture 1 enabled */
      rmesa->tmu_source[0] = 1;
      rmesa->tmu_source[1] = 0;
   }

   ok = (updateTextureUnit( ctx, 0 ) &&
	 updateTextureUnit( ctx, 1 ));

   FALLBACK( rmesa, R128_FALLBACK_TEXTURE, !ok );
}