sis_texstate.c

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

      lastLevel = MAX2(firstLevel, lastLevel); /* need at least one level */
   }

   current->texture[hw_unit].hwTextureSet |= (lastLevel << 8);

   switch (texObj->MagFilter)
   {
   case GL_NEAREST:
      current->texture[hw_unit].hwTextureMip |= TEXTURE_FILTER_NEAREST;
      break;
   case GL_LINEAR:
      current->texture[hw_unit].hwTextureMip |= (TEXTURE_FILTER_LINEAR << 3);
      break;
   }

   {
      GLint b;

      /* The mipmap lod biasing is based on experiment.  It seems there's a
       * limit of around +4/-4 to the bias value; we're being conservative.
       */
      b = (GLint) (ctx->Texture.Unit[hw_unit].LodBias * 32.0);
      if (b > 127)
         b = 127;
      else if (b < -128)
         b = -128;

      current->texture[hw_unit].hwTextureMip |= ((b << 4) &
         MASK_TextureMipmapLodBias);
   }

   switch (texObj->MinFilter)
   {
   case GL_NEAREST:
      current->texture[hw_unit].hwTextureMip |= TEXTURE_FILTER_NEAREST;
      break;
   case GL_LINEAR:
      current->texture[hw_unit].hwTextureMip |= TEXTURE_FILTER_LINEAR;
      break;
   case GL_NEAREST_MIPMAP_NEAREST:
      current->texture[hw_unit].hwTextureMip |=
         TEXTURE_FILTER_NEAREST_MIP_NEAREST;
      break;
   case GL_NEAREST_MIPMAP_LINEAR:
      current->texture[hw_unit].hwTextureMip |=
         TEXTURE_FILTER_NEAREST_MIP_LINEAR;
      break;
   case GL_LINEAR_MIPMAP_NEAREST:
      current->texture[hw_unit].hwTextureMip |=
         TEXTURE_FILTER_LINEAR_MIP_NEAREST;
      break;
   case GL_LINEAR_MIPMAP_LINEAR:
      current->texture[hw_unit].hwTextureMip |=
         TEXTURE_FILTER_LINEAR_MIP_LINEAR;
      break;
   }

   switch (texObj->WrapS)
   {
   case GL_REPEAT:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureWrapU;
      break;
   case GL_MIRRORED_REPEAT:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureMirrorU;
      break;
   case GL_CLAMP:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureClampU;
       /* XXX: GL_CLAMP isn't conformant, but falling back makes the situation
        * worse in other programs at the moment.
        */
      /*ok = 0;*/
      break;
   case GL_CLAMP_TO_EDGE:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureClampU;
      break;
   case GL_CLAMP_TO_BORDER:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureBorderU;
      break;
   }

   switch (texObj->WrapT)
   {
   case GL_REPEAT:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureWrapV;
      break;
   case GL_MIRRORED_REPEAT:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureMirrorV;
      break;
   case GL_CLAMP:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureClampV;
       /* XXX: GL_CLAMP isn't conformant, but falling back makes the situation
        * worse in other programs at the moment.
        */
      /*ok = 0;*/
      break;
   case GL_CLAMP_TO_EDGE:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureClampV;
      break;
   case GL_CLAMP_TO_BORDER:
      current->texture[hw_unit].hwTextureSet |= MASK_TextureBorderV;
      break;
   }

   current->texture[hw_unit].hwTextureBorderColor = 
      ((GLuint) texObj->_BorderChan[3] << 24) + 
      ((GLuint) texObj->_BorderChan[0] << 16) + 
      ((GLuint) texObj->_BorderChan[1] << 8) + 
      ((GLuint) texObj->_BorderChan[2]);

   if (current->texture[hw_unit].hwTextureBorderColor !=
       prev->texture[hw_unit].hwTextureBorderColor) 
   {
      prev->texture[hw_unit].hwTextureBorderColor =
         current->texture[hw_unit].hwTextureBorderColor; 
      if (hw_unit == 1)
         smesa->GlobalFlag |= GFLAG_TEXBORDERCOLOR_1; 
      else
         smesa->GlobalFlag |= GFLAG_TEXBORDERCOLOR;
   }

   current->texture[hw_unit].hwTextureSet |=
      texObj->Image[0][firstLevel]->WidthLog2 << 4;
   current->texture[hw_unit].hwTextureSet |=
      texObj->Image[0][firstLevel]->HeightLog2;

   if (hw_unit == 0)
      smesa->GlobalFlag |= GFLAG_TEXTUREADDRESS;
   else
      smesa->GlobalFlag |= GFLAG_TEXTUREADDRESS_1;

   for (i = firstLevel; i <= lastLevel; i++)
   {
      GLuint texOffset = 0;
      GLuint texPitch = TransferTexturePitch( t->image[i].pitch );

      switch (t->image[i].memType)
      {
      case VIDEO_TYPE:
         texOffset = ((unsigned long)t->image[i].Data - (unsigned long)smesa->FbBase);
         break;
      case AGP_TYPE:
         texOffset = ((unsigned long)t->image[i].Data - (unsigned long)smesa->AGPBase) +
            (unsigned long) smesa->AGPAddr;
         current->texture[hw_unit].hwTextureMip |=
            (MASK_TextureLevel0InSystem << i);
         break;
      }

      switch (i)
      {
      case 0:
         prev->texture[hw_unit].texOffset0 = texOffset;
         prev->texture[hw_unit].texPitch01 = texPitch << 16;
         break;
      case 1:
         prev->texture[hw_unit].texOffset1 = texOffset;
         prev->texture[hw_unit].texPitch01 |= texPitch;
         break;
      case 2:
         prev->texture[hw_unit].texOffset2 = texOffset;
         prev->texture[hw_unit].texPitch23 = texPitch << 16;
         break;
      case 3:
         prev->texture[hw_unit].texOffset3 = texOffset;
         prev->texture[hw_unit].texPitch23 |= texPitch;
         break;
      case 4:
         prev->texture[hw_unit].texOffset4 = texOffset;
         prev->texture[hw_unit].texPitch45 = texPitch << 16;
         break;
      case 5:
         prev->texture[hw_unit].texOffset5 = texOffset;
         prev->texture[hw_unit].texPitch45 |= texPitch;
         break;
      case 6:
         prev->texture[hw_unit].texOffset6 = texOffset;
         prev->texture[hw_unit].texPitch67 = texPitch << 16;
         break;
      case 7:
         prev->texture[hw_unit].texOffset7 = texOffset;
         prev->texture[hw_unit].texPitch67 |= texPitch;
         break;
      case 8:
         prev->texture[hw_unit].texOffset8 = texOffset;
         prev->texture[hw_unit].texPitch89 = texPitch << 16;
         break;
      case 9:
         prev->texture[hw_unit].texOffset9 = texOffset;
         prev->texture[hw_unit].texPitch89 |= texPitch;
         break;
      case 10:
         prev->texture[hw_unit].texOffset10 = texOffset;
         prev->texture[hw_unit].texPitch10 = texPitch << 16;
         break;
      case 11:
         prev->texture[hw_unit].texOffset11 = texOffset;
         prev->texture[hw_unit].texPitch10 |= texPitch;
         break;
      }
   }

   if (current->texture[hw_unit].hwTextureSet != 
      prev->texture[hw_unit].hwTextureSet)
   {
      prev->texture[hw_unit].hwTextureSet =
         current->texture[hw_unit].hwTextureSet;
      if (hw_unit == 1)
         smesa->GlobalFlag |= CFLAG_TEXTURERESET_1;
      else
         smesa->GlobalFlag |= CFLAG_TEXTURERESET;
   }
   if (current->texture[hw_unit].hwTextureMip != 
      prev->texture[hw_unit].hwTextureMip)
   {
      prev->texture[hw_unit].hwTextureMip =
         current->texture[hw_unit].hwTextureMip;
      if (hw_unit == 1)
         smesa->GlobalFlag |= GFLAG_TEXTUREMIPMAP_1;
      else
         smesa->GlobalFlag |= GFLAG_TEXTUREMIPMAP;
   }

   return ok;
}

/* Disable a texture unit, called from validate_texture */
static void
sis_reset_texture_env (GLcontext *ctx, int hw_unit)
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   if (hw_unit == 1)
   {
      current->hwTexBlendColor1 = STAGE1_C_CF;
      current->hwTexBlendAlpha1 = STAGE1_A_AF;
      
      if ((current->hwTexBlendColor1 != prev->hwTexBlendColor1) ||
          (current->hwTexBlendAlpha1 != prev->hwTexBlendAlpha1) ||
          (current->hwTexEnvColor != prev->hwTexEnvColor))
      {
         prev->hwTexBlendColor1 = current->hwTexBlendColor1;
         prev->hwTexBlendAlpha1 = current->hwTexBlendAlpha1;
         prev->hwTexEnvColor = current->hwTexEnvColor;
         smesa->GlobalFlag |= GFLAG_TEXTUREENV_1;
      }
   } else {
      current->hwTexBlendColor0 = STAGE0_C_CF;
      current->hwTexBlendAlpha0 = STAGE0_A_AF;
      
      if ((current->hwTexBlendColor0 != prev->hwTexBlendColor0) ||
          (current->hwTexBlendAlpha0 != prev->hwTexBlendAlpha0) ||
          (current->hwTexEnvColor != prev->hwTexEnvColor))
      {
         prev->hwTexBlendColor0 = current->hwTexBlendColor0;
         prev->hwTexBlendAlpha0 = current->hwTexBlendAlpha0;
         prev->hwTexEnvColor = current->hwTexEnvColor;
         smesa->GlobalFlag |= GFLAG_TEXTUREENV;
      }
   }
}

static void updateTextureUnit( GLcontext *ctx, int unit )
{
   sisContextPtr smesa = SIS_CONTEXT( ctx );
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
   struct gl_texture_object *texObj = texUnit->_Current;
   GLint fallbackbit;
   
   if (unit == 0)
      fallbackbit = SIS_FALLBACK_TEXTURE0;
   else
      fallbackbit = SIS_FALLBACK_TEXTURE1;

   if (texUnit->_ReallyEnabled & (TEXTURE_1D_BIT | TEXTURE_2D_BIT)) {
      if (smesa->TexStates[unit] & NEW_TEXTURING) {
         GLboolean ok;

         ok = sis_set_texobj_parm (ctx, texObj, unit);
         FALLBACK( smesa, fallbackbit, !ok );
      }
      if (smesa->TexStates[unit] & NEW_TEXTURE_ENV) {
         if (unit == 0)
            sis_set_texture_env0( ctx, texObj, unit );
         else
            sis_set_texture_env1( ctx, texObj, unit );
      }
      smesa->TexStates[unit] = 0;
   } else if ( texUnit->_ReallyEnabled ) {
      /* fallback */
      FALLBACK( smesa, fallbackbit, 1 );
   } else {
      sis_reset_texture_env( ctx, unit );
      FALLBACK( smesa, fallbackbit, 0 );
   }
}


void sisUpdateTextureState( GLcontext *ctx )
{
   sisContextPtr smesa = SIS_CONTEXT( ctx );
   int i;
   __GLSiSHardware *current = &smesa->current;

#if 1
   /* TODO : if unmark these, error in multitexture */ /* XXX */
   for (i = 0; i < SIS_MAX_TEXTURES; i++)
      smesa->TexStates[i] |= (NEW_TEXTURING | NEW_TEXTURE_ENV);
#endif

   updateTextureUnit( ctx, 0 );
   updateTextureUnit( ctx, 1 );

   /* XXX Issues with the 2nd unit but not the first being enabled? */
   if ( ctx->Texture.Unit[0]._ReallyEnabled &
        (TEXTURE_1D_BIT | TEXTURE_2D_BIT) ||
        ctx->Texture.Unit[1]._ReallyEnabled &
        (TEXTURE_1D_BIT | TEXTURE_2D_BIT) )
   {
      current->hwCapEnable |= MASK_TextureEnable;
      current->hwCapEnable &= ~MASK_TextureNumUsed;
      if (ctx->Texture.Unit[1]._ReallyEnabled)
         current->hwCapEnable |= 0x00002000;
      else
         current->hwCapEnable |= 0x00001000;
   } else {
      current->hwCapEnable &= ~MASK_TextureEnable;
   }
}

static GLint
BitScanForward( GLshort w )
{
   GLint i;

   for (i = 0; i < 16; i++) {
      if (w & (1 << i))
         break;
   }
   return i;
}

static GLint
TransferTexturePitch( GLint dwPitch )
{
   GLint dwRet, i;

   i = BitScanForward( (GLshort)dwPitch );
   dwRet = dwPitch >> i;
   dwRet |= i << 9;
   return dwRet;
}