i915_texprog.c

mesa-6.5-minigui源码

			 out );

	 return out;
      }
   }

   case GL_DECAL: {
      if (format == GL_RGB ||
	  format == GL_RGBA) {
	 int cf = get_source( p, GL_PREVIOUS, unit );
	 int cs = get_source( p, GL_TEXTURE, unit );
	 int out = get_dest(p, unit);
	 
	 /* cv = cf(1-as) + cs.as
	  * cv = cf.(-as) + cf + cs.as
	  * av = af
	  */ 
	 
	 /* u[2] = mad( cf.xyzw * cs.-w-w-w1 + cf.xyz0 )
	  * oc = mad( cs.xyz0 * cs.www0 + u[2].xyzw )
	  */
	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, 0,
			 cf,  
			 negate(swizzle(cs,W,W,W,ONE),1,1,1,0),
			 swizzle(cf,X,Y,Z,ZERO) );
	 
	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cs,X,Y,Z,ZERO),  
			 swizzle(cs,W,W,W,ZERO),
			 out );
	 return out;
      }
      else {
	 return get_source( p, GL_PREVIOUS, unit );
      }
   }

   case GL_REPLACE: {
      const int cs = get_source( p, GL_TEXTURE, unit );	/* saturated */
      switch (format) {
      case GL_ALPHA: {
	 const int cf = get_source( p, GL_PREVIOUS, unit ); /* saturated */
	 i915_emit_arith( p, A0_MOV, cs, A0_DEST_CHANNEL_XYZ, 0, cf, 0, 0 );
	 return cs;
      }
      case GL_RGB:
      case GL_LUMINANCE: {
	 const int cf = get_source( p, GL_PREVIOUS, unit ); /* saturated */
	 i915_emit_arith( p, A0_MOV, cs, A0_DEST_CHANNEL_W, 0, cf, 0, 0 );
	 return cs;
      }
      default:
	 return cs;
      }
   }

   case GL_MODULATE: {
      const int cf = get_source( p, GL_PREVIOUS, unit );
      const int cs = get_source( p, GL_TEXTURE, unit );
      const int out = get_dest(p, unit);
      switch (format) {
      case GL_ALPHA: 
	 i915_emit_arith( p, A0_MUL, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cs, ONE, ONE, ONE, W), cf, 0 );
	 break;
      default:
	 i915_emit_arith( p, A0_MUL, out, A0_DEST_CHANNEL_ALL, saturate, 
			 cs, cf, 0 );
	 break;
      }
      return out;
   }
   case GL_ADD: {
      int cf = get_source( p, GL_PREVIOUS, unit );
      int cs = get_source( p, GL_TEXTURE, unit );
      const int out = get_dest( p, unit );

      if (format == GL_INTENSITY) {
	 /* output-color.rgba = add( incoming, u[1] )
	  */
	 i915_emit_arith( p, A0_ADD, out, A0_DEST_CHANNEL_ALL, saturate, 
			 cs, cf, 0 );
	 return out;
      }
      else {
	 /* cv.xyz = cf.xyz + cs.xyz
	  * cv.w   = cf.w * cs.w
	  *
	  * cv.xyzw = MAD( cf.111w * cs.xyzw + cf.xyz0 )
	  */
 	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cf,ONE,ONE,ONE,W), 
			 cs,  
			 swizzle(cf,X,Y,Z,ZERO) ); 
	 return out;
      }
      break;
   }
   case GL_COMBINE: {
      GLuint rgb_shift, alpha_shift, out, shift;
      GLuint dest = get_dest(p, unit);

      /* The EXT version of the DOT3 extension does not support the
       * scale factor, but the ARB version (and the version in OpenGL
       * 1.3) does.
       */
      switch (texUnit->Combine.ModeRGB) {
      case GL_DOT3_RGB_EXT:
	 alpha_shift = texUnit->Combine.ScaleShiftA;
	 rgb_shift = 0;
	 break;

      case GL_DOT3_RGBA_EXT:
	 alpha_shift = 0;
	 rgb_shift = 0;
	 break;

      default:
	 rgb_shift = texUnit->Combine.ScaleShiftRGB;
	 alpha_shift = texUnit->Combine.ScaleShiftA;
	 break;
      }


      /* Emit the RGB and A combine ops
       */
      if (texUnit->Combine.ModeRGB == texUnit->Combine.ModeA && 
	  args_match( texUnit )) {
	 out = emit_combine( p, dest, A0_DEST_CHANNEL_ALL, saturate,
			     unit,
			     texUnit->Combine.ModeRGB,
			     texUnit->Combine.SourceRGB,
			     texUnit->Combine.OperandRGB );
      }
      else if (texUnit->Combine.ModeRGB == GL_DOT3_RGBA_EXT ||
	       texUnit->Combine.ModeRGB == GL_DOT3_RGBA) {

	 out = emit_combine( p, dest, A0_DEST_CHANNEL_ALL, saturate,
			     unit,
			     texUnit->Combine.ModeRGB,
			     texUnit->Combine.SourceRGB,
			     texUnit->Combine.OperandRGB );
      }
      else {
	 /* Need to do something to stop from re-emitting identical
	  * argument calculations here:
	  */
	 out = emit_combine( p, dest, A0_DEST_CHANNEL_XYZ, saturate,
			     unit,
			     texUnit->Combine.ModeRGB,
			     texUnit->Combine.SourceRGB,
			     texUnit->Combine.OperandRGB );
	 out = emit_combine( p, dest, A0_DEST_CHANNEL_W, saturate,
			     unit,
			     texUnit->Combine.ModeA,
			     texUnit->Combine.SourceA,
			     texUnit->Combine.OperandA );
      }

      /* Deal with the final shift:
       */
      if (alpha_shift || rgb_shift) {
	 if (rgb_shift == alpha_shift) {
	    shift = i915_emit_const1f(p, 1<<rgb_shift);
	    shift = swizzle(shift,X,X,X,X);
	 }
	 else {
	    shift = i915_emit_const2f(p, 1<<rgb_shift, 1<<alpha_shift);
	    shift = swizzle(shift,X,X,X,Y);
	 }
	 return i915_emit_arith( p, A0_MUL, dest, A0_DEST_CHANNEL_ALL, 
				saturate, out, shift, 0 );
      }

      return out;
   }

   default:
      return get_source(p, GL_PREVIOUS, 0);
   }
}

static void emit_program_fini( struct i915_fragment_program *p )
{
   int cf = get_source( p, GL_PREVIOUS, 0 );
   int out = UREG( REG_TYPE_OC, 0 );

   if (p->ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) {
      /* Emit specular add.
       */
      GLuint s = i915_emit_decl(p, REG_TYPE_T, T_SPECULAR, D0_CHANNEL_ALL);
      i915_emit_arith( p, A0_ADD, out, A0_DEST_CHANNEL_ALL, 0, cf, 
		  swizzle(s, X,Y,Z,ZERO), 0 );
   }
   else if (cf != out) {
      /* Will wind up in here if no texture enabled or a couple of
       * other scenarios (GL_REPLACE for instance).
       */
      i915_emit_arith( p, A0_MOV, out, A0_DEST_CHANNEL_ALL, 0, cf, 0, 0 );
   }
}


static void i915EmitTextureProgram( i915ContextPtr i915 )
{
   GLcontext *ctx = &i915->intel.ctx;
   struct i915_fragment_program *p = &i915->tex_program;
   GLuint unit;

   if (0) fprintf(stderr, "%s\n", __FUNCTION__);

   i915_init_program( i915, p );

   if (ctx->Texture._EnabledUnits) {
      for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
	 if (ctx->Texture.Unit[unit]._ReallyEnabled) {
	    p->last_tex_stage = unit;
	 }

      for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++)
	 if (ctx->Texture.Unit[unit]._ReallyEnabled) {
	    p->src_previous = emit_texenv( p, unit );
	    p->src_texture = UREG_BAD;
	    p->temp_flag = 0xffff000;
	    p->temp_flag |= 1 << GET_UREG_NR(p->src_previous);
	 }
   }

   emit_program_fini( p );

   i915_fini_program( p );
   i915_upload_program( i915, p );

   p->translated = 1;
}


void i915ValidateTextureProgram( i915ContextPtr i915 )
{
   intelContextPtr intel = &i915->intel;
   GLcontext *ctx = &intel->ctx;
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &tnl->vb;
   GLuint index = tnl->render_inputs;
   int i, offset;
   GLuint s4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_VFMT_MASK;
   GLuint s2 = S2_TEXCOORD_NONE;

   /* Important:
    */
   VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
   intel->vertex_attr_count = 0;
   intel->coloroffset = 0;
   intel->specoffset = 0;
   offset = 0;

   if (i915->vertex_fog == I915_FOG_PIXEL) {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, S4_VFMT_XYZW, 16 );
      index &= ~_TNL_BIT_FOG;
   }
   else if (index & _TNL_BITS_TEX_ANY) {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, S4_VFMT_XYZW, 16 );
   }
   else {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_3F_VIEWPORT, S4_VFMT_XYZ, 12 );
   }

   /* How undefined is undefined? */
   if (index & _TNL_BIT_POINTSIZE) {
      EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, S4_VFMT_POINT_WIDTH, 4 );
   }
      
   intel->coloroffset = offset / 4;
   EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4UB_4F_BGRA, S4_VFMT_COLOR, 4 );
            
   if (index & (_TNL_BIT_COLOR1|_TNL_BIT_FOG)) {
      if (index & _TNL_BIT_COLOR1) {
	 intel->specoffset = offset / 4;
	 EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_3UB_3F_BGR, S4_VFMT_SPEC_FOG, 3 );
      } else 
	 EMIT_PAD( 3 );
      
      if (index & _TNL_BIT_FOG)
	 EMIT_ATTR( _TNL_ATTRIB_FOG, EMIT_1UB_1F, S4_VFMT_SPEC_FOG, 1 );
      else
	 EMIT_PAD( 1 );
   }

   if (index & _TNL_BITS_TEX_ANY) {
      for (i = 0; i < 8; i++) {
	 if (index & _TNL_BIT_TEX(i)) {
	    int sz = VB->TexCoordPtr[i]->size;
	    
	    s2 &= ~S2_TEXCOORD_FMT(i, S2_TEXCOORD_FMT0_MASK);
	    s2 |= S2_TEXCOORD_FMT(i, SZ_TO_HW(sz));

	    EMIT_ATTR( _TNL_ATTRIB_TEX0+i, EMIT_SZ(sz), 0, sz * 4 );
	 }
      }
   }

   /* Only need to change the vertex emit code if there has been a
    * statechange to a new hardware vertex format:
    */
   if (s2 != i915->state.Ctx[I915_CTXREG_LIS2] ||
       s4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
    
      I915_STATECHANGE( i915, I915_UPLOAD_CTX );

      i915->tex_program.translated = 0;

      /* Must do this *after* statechange, so as not to affect
       * buffered vertices reliant on the old state:
       */
      intel->vertex_size = _tnl_install_attrs( ctx, 
					       intel->vertex_attrs, 
					       intel->vertex_attr_count,
					       intel->ViewportMatrix.m, 0 ); 

      intel->vertex_size >>= 2;

      i915->state.Ctx[I915_CTXREG_LIS2] = s2;
      i915->state.Ctx[I915_CTXREG_LIS4] = s4;

      assert(intel->vtbl.check_vertex_size( intel, intel->vertex_size ));
   }

   if (!i915->tex_program.translated ||
       i915->last_ReallyEnabled != ctx->Texture._EnabledUnits) {
      i915EmitTextureProgram( i915 );      
      i915->last_ReallyEnabled = ctx->Texture._EnabledUnits;
   }
}