tdfx_texstate.c

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

         fxMesa->TexCombine[1].InvertRGB = FXTRUE;
         fxMesa->TexCombine[1].InvertAlpha = FXFALSE;
      }
      else {
         fxMesa->TexCombine[1].FunctionRGB = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->TexCombine[1].FactorRGB = GR_COMBINE_FACTOR_NONE;
         fxMesa->TexCombine[1].FunctionAlpha = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->TexCombine[1].FactorAlpha = GR_COMBINE_FACTOR_NONE;
         fxMesa->TexCombine[1].InvertRGB = FXFALSE;
         fxMesa->TexCombine[1].InvertAlpha = FXFALSE;
      }
      if (isalpha[TDFX_TMU0]) {
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_SCALE_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].InvertAlpha = FXFALSE;
      }
      else {
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].InvertAlpha = FXFALSE;
      }
      fxMesa->ColorCombine.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
      fxMesa->ColorCombine.Factor = GR_COMBINE_FACTOR_LOCAL;
      fxMesa->ColorCombine.Local = localc;
      fxMesa->ColorCombine.Other = GR_COMBINE_OTHER_TEXTURE;
      fxMesa->ColorCombine.Invert = FXFALSE;
      fxMesa->AlphaCombine.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
      fxMesa->AlphaCombine.Factor = GR_COMBINE_FACTOR_LOCAL;
      fxMesa->AlphaCombine.Local = locala;
      fxMesa->AlphaCombine.Other = GR_COMBINE_OTHER_TEXTURE;
      fxMesa->AlphaCombine.Invert = FXFALSE;
   }
   else if (envMode0 == GL_REPLACE && envMode1 == GL_ADD) {
      /* Vulpine sky */
      GLboolean isalpha[TDFX_NUM_TMU];

      isalpha[tmu0] = (baseFormat0 == GL_ALPHA);
      isalpha[tmu1] = (baseFormat1 == GL_ALPHA);

      if (isalpha[TDFX_TMU1]) {
         fxMesa->TexCombine[1].FunctionRGB = GR_COMBINE_FUNCTION_ZERO;
         fxMesa->TexCombine[1].FactorRGB = GR_COMBINE_FACTOR_NONE;
         fxMesa->TexCombine[1].FunctionAlpha = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->TexCombine[1].FactorAlpha = GR_COMBINE_FACTOR_NONE;
         fxMesa->TexCombine[1].InvertRGB = FXTRUE;
         fxMesa->TexCombine[1].InvertAlpha = FXFALSE;
      } else {
         fxMesa->TexCombine[1].FunctionRGB = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->TexCombine[1].FactorRGB = GR_COMBINE_FACTOR_NONE;
         fxMesa->TexCombine[1].FunctionAlpha = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->TexCombine[1].FactorAlpha = GR_COMBINE_FACTOR_NONE;
         fxMesa->TexCombine[1].InvertRGB = FXFALSE;
         fxMesa->TexCombine[1].InvertAlpha = FXFALSE;
      }

      if (isalpha[TDFX_TMU0]) {
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_SCALE_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].InvertAlpha = FXFALSE;
      } else {
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].InvertAlpha = FXFALSE;
      }

      fxMesa->ColorCombine.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
      fxMesa->ColorCombine.Factor = GR_COMBINE_FACTOR_ONE;
      fxMesa->ColorCombine.Local = localc;
      fxMesa->ColorCombine.Other = GR_COMBINE_OTHER_TEXTURE;
      fxMesa->ColorCombine.Invert = FXFALSE;
      fxMesa->AlphaCombine.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
      fxMesa->AlphaCombine.Factor = GR_COMBINE_FACTOR_ONE;
      fxMesa->AlphaCombine.Local = locala;
      fxMesa->AlphaCombine.Other = GR_COMBINE_OTHER_TEXTURE;
      fxMesa->AlphaCombine.Invert = FXFALSE;
   }
   else if (envMode1 == GL_REPLACE) {
      /* Homeworld2 */

      fxMesa->TexCombine[1].FunctionRGB = GR_COMBINE_FUNCTION_ZERO;
      fxMesa->TexCombine[1].FactorRGB = GR_COMBINE_FACTOR_NONE;
      fxMesa->TexCombine[1].FunctionAlpha = GR_COMBINE_FUNCTION_ZERO;
      fxMesa->TexCombine[1].FactorAlpha = GR_COMBINE_FACTOR_NONE;
      fxMesa->TexCombine[1].InvertRGB = FXFALSE;
      fxMesa->TexCombine[1].InvertAlpha = FXFALSE;

      fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_LOCAL;
      fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_NONE;
      fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_LOCAL;
      fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_NONE;
      fxMesa->TexCombine[0].InvertRGB = FXFALSE;
      fxMesa->TexCombine[0].InvertAlpha = FXFALSE;

      if ((baseFormat0 == GL_RGB) && (baseFormat0 == GL_LUMINANCE)) {
         fxMesa->AlphaCombine.Function = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->AlphaCombine.Factor = GR_COMBINE_FACTOR_NONE;
         fxMesa->AlphaCombine.Local = locala;
         fxMesa->AlphaCombine.Other = GR_COMBINE_OTHER_NONE;
         fxMesa->AlphaCombine.Invert = FXFALSE;
      } else {
         fxMesa->AlphaCombine.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
         fxMesa->AlphaCombine.Factor = GR_COMBINE_FACTOR_ONE;
         fxMesa->AlphaCombine.Local = locala;
         fxMesa->AlphaCombine.Other = GR_COMBINE_OTHER_TEXTURE;
         fxMesa->AlphaCombine.Invert = FXFALSE;
      }
      if (baseFormat0 == GL_ALPHA) {
         fxMesa->ColorCombine.Function = GR_COMBINE_FUNCTION_LOCAL;
         fxMesa->ColorCombine.Factor = GR_COMBINE_FACTOR_NONE;
         fxMesa->ColorCombine.Local = localc;
         fxMesa->ColorCombine.Other = GR_COMBINE_OTHER_NONE;
         fxMesa->ColorCombine.Invert = FXFALSE;
      } else {
         fxMesa->ColorCombine.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
         fxMesa->ColorCombine.Factor = GR_COMBINE_FACTOR_ONE;
         fxMesa->ColorCombine.Local = localc;
         fxMesa->ColorCombine.Other = GR_COMBINE_OTHER_TEXTURE;
         fxMesa->ColorCombine.Invert = FXFALSE;
      }
   }
   else {
      _mesa_problem(ctx, "%s: Unexpected dual texture mode encountered", __FUNCTION__);
      return GL_FALSE;
   }

   fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_ENV;
   fxMesa->dirty |= TDFX_UPLOAD_COLOR_COMBINE;
   fxMesa->dirty |= TDFX_UPLOAD_ALPHA_COMBINE;
   return GL_TRUE;
}


/*
 * This function makes sure that the correct mipmap levels are loaded
 * in the right places in memory and then makes the Glide calls to
 * setup the texture source pointers.
 */
static void
setupSingleTMU(tdfxContextPtr fxMesa, struct gl_texture_object *tObj)
{
   struct tdfxSharedState *shared = (struct tdfxSharedState *) fxMesa->glCtx->Shared->DriverData;
   tdfxTexInfo *ti = TDFX_TEXTURE_DATA(tObj);
   const GLcontext *ctx = fxMesa->glCtx;

   /* Make sure we're not loaded incorrectly */
   if (ti->isInTM && !shared->umaTexMemory) {
      /* if doing filtering between mipmap levels, alternate mipmap levels
       * must be in alternate TMUs.
       */
      if (ti->LODblend) {
         if (ti->whichTMU != TDFX_TMU_SPLIT)
            tdfxTMMoveOutTM_NoLock(fxMesa, tObj);
      }
      else {
         if (ti->whichTMU == TDFX_TMU_SPLIT)
            tdfxTMMoveOutTM_NoLock(fxMesa, tObj);
      }
   }

   /* Make sure we're loaded correctly */
   if (!ti->isInTM) {
      /* Have to download the texture */
      if (shared->umaTexMemory) {
         tdfxTMMoveInTM_NoLock(fxMesa, tObj, TDFX_TMU0);
      }
      else {
         /* Voodoo3 (split texture memory) */
         if (ti->LODblend) {
            tdfxTMMoveInTM_NoLock(fxMesa, tObj, TDFX_TMU_SPLIT);
         }
         else {
#if 0
            /* XXX putting textures into the second memory bank when the
             * first bank is full is not working at this time.
             */
            if (fxMesa->haveTwoTMUs) {
               GLint memReq = fxMesa->Glide.grTexTextureMemRequired(
                                       GR_MIPMAPLEVELMASK_BOTH, &(ti->info));
               if (shared->freeTexMem[TDFX_TMU0] > memReq) {
                  tdfxTMMoveInTM_NoLock(fxMesa, tObj, TDFX_TMU0);
               }
               else {
                  tdfxTMMoveInTM_NoLock(fxMesa, tObj, TDFX_TMU1);
               }
            }
            else
#endif
            {
               tdfxTMMoveInTM_NoLock(fxMesa, tObj, TDFX_TMU0);
            }
         }
      }
   }

   if (ti->LODblend && ti->whichTMU == TDFX_TMU_SPLIT) {
      /* mipmap levels split between texture banks */
      GLint u;

      if (ti->info.format == GR_TEXFMT_P_8 && !ctx->Texture.SharedPalette) {
         fxMesa->TexPalette.Type = ti->paltype;
         fxMesa->TexPalette.Data = &(ti->palette);
         fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_PALETTE;
      }

      for (u = 0; u < 2; u++) {
         fxMesa->TexParams[u].sClamp = ti->sClamp;
         fxMesa->TexParams[u].tClamp = ti->tClamp;
         fxMesa->TexParams[u].minFilt = ti->minFilt;
         fxMesa->TexParams[u].magFilt = ti->magFilt;
         fxMesa->TexParams[u].mmMode = ti->mmMode;
         fxMesa->TexParams[u].LODblend = ti->LODblend;
         fxMesa->TexParams[u].LodBias = ctx->Texture.Unit[u].LodBias;
      }
      fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_PARAMS;

      fxMesa->TexSource[0].StartAddress = ti->tm[TDFX_TMU0]->startAddr;
      fxMesa->TexSource[0].EvenOdd = GR_MIPMAPLEVELMASK_ODD;
      fxMesa->TexSource[0].Info = &(ti->info);
      fxMesa->TexSource[1].StartAddress = ti->tm[TDFX_TMU1]->startAddr;
      fxMesa->TexSource[1].EvenOdd = GR_MIPMAPLEVELMASK_EVEN;
      fxMesa->TexSource[1].Info = &(ti->info);
      fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_SOURCE;
   }
   else {
      FxU32 tmu;

      if (ti->whichTMU == TDFX_TMU_BOTH)
         tmu = TDFX_TMU0;
      else
         tmu = ti->whichTMU;

      if (shared->umaTexMemory) {
         assert(ti->whichTMU == TDFX_TMU0);
         assert(tmu == TDFX_TMU0);
      }

      if (ti->info.format == GR_TEXFMT_P_8 && !ctx->Texture.SharedPalette) {
         fxMesa->TexPalette.Type = ti->paltype;
         fxMesa->TexPalette.Data = &(ti->palette);
         fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_PALETTE;
      }

      /* KW: The alternative is to do the download to the other tmu.  If
       * we get to this point, I think it means we are thrashing the
       * texture memory, so perhaps it's not a good idea.
       */

      if (fxMesa->TexParams[tmu].sClamp != ti->sClamp ||
          fxMesa->TexParams[tmu].tClamp != ti->tClamp ||
          fxMesa->TexParams[tmu].minFilt != ti->minFilt ||
          fxMesa->TexParams[tmu].magFilt != ti->magFilt ||
          fxMesa->TexParams[tmu].mmMode != ti->mmMode ||
          fxMesa->TexParams[tmu].LODblend != FXFALSE ||
          fxMesa->TexParams[tmu].LodBias != ctx->Texture.Unit[tmu].LodBias) {
         fxMesa->TexParams[tmu].sClamp = ti->sClamp;
         fxMesa->TexParams[tmu].tClamp = ti->tClamp;
         fxMesa->TexParams[tmu].minFilt = ti->minFilt;
         fxMesa->TexParams[tmu].magFilt = ti->magFilt;
         fxMesa->TexParams[tmu].mmMode = ti->mmMode;
         fxMesa->TexParams[tmu].LODblend = FXFALSE;
         fxMesa->TexParams[tmu].LodBias = ctx->Texture.Unit[tmu].LodBias;
         fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_PARAMS;
      }

      /* Glide texture source info */
      fxMesa->TexSource[0].Info = NULL;
      fxMesa->TexSource[1].Info = NULL;
      if (ti->tm[tmu]) {
         fxMesa->TexSource[tmu].StartAddress = ti->tm[tmu]->startAddr;
         fxMesa->TexSource[tmu].EvenOdd = GR_MIPMAPLEVELMASK_BOTH;
         fxMesa->TexSource[tmu].Info = &(ti->info);
         fxMesa->dirty |= TDFX_UPLOAD_TEXTURE_SOURCE;
      }
   }

   fxMesa->sScale0 = ti->sScale;
   fxMesa->tScale0 = ti->tScale;
}

static void
selectSingleTMUSrc(tdfxContextPtr fxMesa, GLint tmu, FxBool LODblend)
{
   if (LODblend) {
      fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_BLEND;
      fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE_MINUS_LOD_FRACTION;
      fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND;
      fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_ONE_MINUS_LOD_FRACTION;
      fxMesa->TexCombine