tdfx_texstate.c

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

      }
      else {
         /* Av = Af * At */
         alphaComb.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
         alphaComb.Factor = GR_COMBINE_FACTOR_LOCAL;
         alphaComb.Local = locala;
         alphaComb.Other = GR_COMBINE_OTHER_TEXTURE;
         alphaComb.Invert = FXFALSE;
      }
      if (baseFormat == GL_ALPHA) {
         colorComb.Function = GR_COMBINE_FUNCTION_LOCAL;
         colorComb.Factor = GR_COMBINE_FACTOR_NONE;
         colorComb.Local = localc;
         colorComb.Other = GR_COMBINE_OTHER_NONE;
         colorComb.Invert = FXFALSE;
      }
      else {
         colorComb.Function = GR_COMBINE_FUNCTION_BLEND;
         colorComb.Factor = GR_COMBINE_FACTOR_TEXTURE_RGB;
         colorComb.Local = localc;
         colorComb.Other = GR_COMBINE_OTHER_CONSTANT;
         colorComb.Invert = FXTRUE;
      }
      fxMesa->Color.MonoColor = PACK_RGBA32(
         ctx->Texture.Unit[unit].EnvColor[0] * 255.0f,
         ctx->Texture.Unit[unit].EnvColor[1] * 255.0f,
         ctx->Texture.Unit[unit].EnvColor[2] * 255.0f,
         ctx->Texture.Unit[unit].EnvColor[3] * 255.0f);
      fxMesa->dirty |= TDFX_UPLOAD_CONSTANT_COLOR;
      break;

   case GL_REPLACE:
      if ((baseFormat == GL_RGB) || (baseFormat == GL_LUMINANCE)) {
         alphaComb.Function = GR_COMBINE_FUNCTION_LOCAL;
         alphaComb.Factor = GR_COMBINE_FACTOR_NONE;
         alphaComb.Local = locala;
         alphaComb.Other = GR_COMBINE_OTHER_NONE;
         alphaComb.Invert = FXFALSE;
      }
      else {
         alphaComb.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
         alphaComb.Factor = GR_COMBINE_FACTOR_ONE;
         alphaComb.Local = locala;
         alphaComb.Other = GR_COMBINE_OTHER_TEXTURE;
         alphaComb.Invert = FXFALSE;
      }
      if (baseFormat == GL_ALPHA) {
         colorComb.Function = GR_COMBINE_FUNCTION_LOCAL;
         colorComb.Factor = GR_COMBINE_FACTOR_NONE;
         colorComb.Local = localc;
         colorComb.Other = GR_COMBINE_OTHER_NONE;
         colorComb.Invert = FXFALSE;
      }
      else {
         colorComb.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
         colorComb.Factor = GR_COMBINE_FACTOR_ONE;
         colorComb.Local = localc;
         colorComb.Other = GR_COMBINE_OTHER_TEXTURE;
         colorComb.Invert = FXFALSE;
      }
      break;

   case GL_ADD:
      if (baseFormat == GL_ALPHA ||
          baseFormat == GL_LUMINANCE_ALPHA ||
          baseFormat == GL_RGBA) {
         /* product of texel and fragment alpha */
         alphaComb.Function = GR_COMBINE_FUNCTION_SCALE_OTHER;
         alphaComb.Factor = GR_COMBINE_FACTOR_LOCAL;
         alphaComb.Local = locala;
         alphaComb.Other = GR_COMBINE_OTHER_TEXTURE;
         alphaComb.Invert = FXFALSE;
      }
      else if (baseFormat == GL_LUMINANCE || baseFormat == GL_RGB) {
         /* fragment alpha is unchanged */
         alphaComb.Function = GR_COMBINE_FUNCTION_LOCAL;
         alphaComb.Factor = GR_COMBINE_FACTOR_NONE;
         alphaComb.Local = locala;
         alphaComb.Other = GR_COMBINE_OTHER_NONE;
         alphaComb.Invert = FXFALSE;
      }
      else {
         ASSERT(baseFormat == GL_INTENSITY);
         /* sum of texel and fragment alpha */
         alphaComb.Function = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL,
         alphaComb.Factor = GR_COMBINE_FACTOR_ONE;
         alphaComb.Local = locala;
         alphaComb.Other = GR_COMBINE_OTHER_TEXTURE;
         alphaComb.Invert = FXFALSE;
      }
      if (baseFormat == GL_ALPHA) {
         /* rgb unchanged */
         colorComb.Function = GR_COMBINE_FUNCTION_LOCAL;
         colorComb.Factor = GR_COMBINE_FACTOR_NONE;
         colorComb.Local = localc;
         colorComb.Other = GR_COMBINE_OTHER_NONE;
         colorComb.Invert = FXFALSE;
      }
      else {
         /* sum of texel and fragment rgb */
         colorComb.Function = GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL,
         colorComb.Factor = GR_COMBINE_FACTOR_ONE;
         colorComb.Local = localc;
         colorComb.Other = GR_COMBINE_OTHER_TEXTURE;
         colorComb.Invert = FXFALSE;
      }
      break;

   default: {
      (void) memcpy(&colorComb, &fxMesa->ColorCombine, sizeof(colorComb));
      (void) memcpy(&alphaComb, &fxMesa->AlphaCombine, sizeof(alphaComb));
      _mesa_problem(ctx, "bad texture env mode in %s", __FUNCTION__);
   }
   }

   if (colorComb.Function != fxMesa->ColorCombine.Function ||
       colorComb.Factor != fxMesa->ColorCombine.Factor ||
       colorComb.Local != fxMesa->ColorCombine.Local ||
       colorComb.Other != fxMesa->ColorCombine.Other ||
       colorComb.Invert != fxMesa->ColorCombine.Invert) {
      fxMesa->ColorCombine = colorComb;
      fxMesa->dirty |= TDFX_UPLOAD_COLOR_COMBINE;
   }

   if (alphaComb.Function != fxMesa->AlphaCombine.Function ||
       alphaComb.Factor != fxMesa->AlphaCombine.Factor ||
       alphaComb.Local != fxMesa->AlphaCombine.Local ||
       alphaComb.Other != fxMesa->AlphaCombine.Other ||
       alphaComb.Invert != fxMesa->AlphaCombine.Invert) {
      fxMesa->AlphaCombine = alphaComb;
      fxMesa->dirty |= TDFX_UPLOAD_ALPHA_COMBINE;
   }
   return GL_TRUE;
}


/*
 * Setup the Voodoo3 texture environment for dual texture units.
 * Return GL_TRUE for success, GL_FALSE for failure.
 * If failure, we'll use software rendering.
 */
static GLboolean
SetupDoubleTexEnvVoodoo3(GLcontext *ctx, int tmu0,
                         GLenum envMode0, GLenum baseFormat0,
                         GLenum envMode1, GLenum baseFormat1)
{
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   const GrCombineLocal_t locala = GR_COMBINE_LOCAL_ITERATED;
   const GrCombineLocal_t localc = GR_COMBINE_LOCAL_ITERATED;
   const int tmu1 = 1 - tmu0;

   if (envMode0 == GL_MODULATE && envMode1 == GL_MODULATE) {
      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_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].InvertAlpha = FXFALSE;
      }
      else {
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_LOCAL;
         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_BLEND) { /* Quake */
      if (tmu0 == TDFX_TMU1) {
         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 = FXTRUE;
         fxMesa->TexCombine[1].InvertAlpha = FXFALSE;
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].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;
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_ONE_MINUS_LOCAL;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_ONE_MINUS_LOCAL;
         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_LOCAL;
      fxMesa->AlphaCombine.Factor = GR_COMBINE_FACTOR_NONE;
      fxMesa->AlphaCombine.Local = locala;
      fxMesa->AlphaCombine.Other = GR_COMBINE_OTHER_NONE;
      fxMesa->AlphaCombine.Invert = FXFALSE;
   }
   else if (envMode0 == GL_REPLACE && envMode1 == GL_MODULATE) {
      /* Quake 2/3 */
      if (tmu1 == TDFX_TMU1) {
         fxMesa->TexCombine[1].FunctionRGB = GR_COMBINE_FUNCTION_LOCAL;
         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 = FXTRUE;
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorAlpha = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].InvertRGB = FXFALSE;
         fxMesa->TexCombine[0].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;
         fxMesa->TexCombine[0].FunctionRGB = GR_COMBINE_FUNCTION_BLEND_OTHER;
         fxMesa->TexCombine[0].FactorRGB = GR_COMBINE_FACTOR_LOCAL;
         fxMesa->TexCombine[0].FunctionAlpha = GR_COMBINE_FUNCTION_BLEND_OTHER;
         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;
      if (baseFormat0 == GL_RGB) {
         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_NONE;
         fxMesa->AlphaCombine.Invert = FXFALSE;
      }
   }
   else if (envMode0 == GL_MODULATE && envMode1 == GL_ADD) {
      /* Quake 3 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;