texstate.c

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

	       if (!ctx->Extensions.ARB_texture_env_dot3) {
                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
		  return;
	       }
	       break;
	    case GL_MODULATE_ADD_ATI:
	    case GL_MODULATE_SIGNED_ADD_ATI:
	    case GL_MODULATE_SUBTRACT_ATI:
	       if (!ctx->Extensions.ATI_texture_env_combine3) {
                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
		  return;
	       }
	       break;
	    default:
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
	       return;
	    }
	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	    texUnit->Combine.ModeRGB = mode;
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
         break;
      case GL_COMBINE_ALPHA:
	 if (ctx->Extensions.EXT_texture_env_combine ||
             ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum mode = (GLenum) (GLint) *param;
	    if (texUnit->Combine.ModeA == mode)
	       return;
            switch (mode) {
	    case GL_REPLACE:
	    case GL_MODULATE:
	    case GL_ADD:
	    case GL_ADD_SIGNED:
	    case GL_INTERPOLATE:
	       /* OK */
	       break;
	    case GL_SUBTRACT:
	       if (!ctx->Extensions.ARB_texture_env_combine) {
		  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
		  return;
	       }
	       break;
	    case GL_MODULATE_ADD_ATI:
	    case GL_MODULATE_SIGNED_ADD_ATI:
	    case GL_MODULATE_SUBTRACT_ATI:
	       if (!ctx->Extensions.ATI_texture_env_combine3) {
                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
		  return;
	       }
	       break;
	    default:
	       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
	       return;
	    }
	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	    texUnit->Combine.ModeA = mode;
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_SOURCE0_RGB:
      case GL_SOURCE1_RGB:
      case GL_SOURCE2_RGB:
	 if (ctx->Extensions.EXT_texture_env_combine ||
	     ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum source = (GLenum) (GLint) *param;
	    const GLuint s = pname - GL_SOURCE0_RGB;
	    if (texUnit->Combine.SourceRGB[s] == source)
	       return;
            if (source == GL_TEXTURE ||
                source == GL_CONSTANT ||
                source == GL_PRIMARY_COLOR ||
                source == GL_PREVIOUS ||
                (ctx->Extensions.ARB_texture_env_crossbar &&
                 source >= GL_TEXTURE0 &&
                 source < GL_TEXTURE0 + ctx->Const.MaxTextureUnits) ||
                (ctx->Extensions.ATI_texture_env_combine3 &&
                 (source == GL_ZERO || source == GL_ONE))) {
               /* legal */
	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	       texUnit->Combine.SourceRGB[s] = source;
            }
            else {
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", source);
	       return;
	    }
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_SOURCE0_ALPHA:
      case GL_SOURCE1_ALPHA:
      case GL_SOURCE2_ALPHA:
	 if (ctx->Extensions.EXT_texture_env_combine ||
             ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum source = (GLenum) (GLint) *param;
	    const GLuint s = pname - GL_SOURCE0_ALPHA;
	    if (texUnit->Combine.SourceA[s] == source)
	       return;
            if (source == GL_TEXTURE ||
                source == GL_CONSTANT ||
                source == GL_PRIMARY_COLOR ||
                source == GL_PREVIOUS ||
                (ctx->Extensions.ARB_texture_env_crossbar &&
                 source >= GL_TEXTURE0 &&
                 source < GL_TEXTURE0 + ctx->Const.MaxTextureUnits) ||
		(ctx->Extensions.ATI_texture_env_combine3 &&
                 (source == GL_ZERO || source == GL_ONE))) {
               /* legal */
	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	       texUnit->Combine.SourceA[s] = source;
            }
            else {
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", source);
	       return;
	    }
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_OPERAND0_RGB:
      case GL_OPERAND1_RGB:
	 if (ctx->Extensions.EXT_texture_env_combine ||
	     ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum operand = (GLenum) (GLint) *param;
	    const GLuint s = pname - GL_OPERAND0_RGB;
	    if (texUnit->Combine.OperandRGB[s] == operand)
	       return;
	    switch (operand) {
	    case GL_SRC_COLOR:
	    case GL_ONE_MINUS_SRC_COLOR:
	    case GL_SRC_ALPHA:
	    case GL_ONE_MINUS_SRC_ALPHA:
	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	       texUnit->Combine.OperandRGB[s] = operand;
	       break;
	    default:
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
	       return;
	    }
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_OPERAND0_ALPHA:
      case GL_OPERAND1_ALPHA:
	 if (ctx->Extensions.EXT_texture_env_combine ||
             ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum operand = (GLenum) (GLint) *param;
	    if (texUnit->Combine.OperandA[pname-GL_OPERAND0_ALPHA] == operand)
	       return;
	    switch (operand) {
	    case GL_SRC_ALPHA:
	    case GL_ONE_MINUS_SRC_ALPHA:
	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	       texUnit->Combine.OperandA[pname-GL_OPERAND0_ALPHA] = operand;
	       break;
	    default:
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
	       return;
	    }
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_OPERAND2_RGB:
	 if (ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum operand = (GLenum) (GLint) *param;
	    if (texUnit->Combine.OperandRGB[2] == operand)
	       return;
	    switch (operand) {
	    case GL_SRC_COLOR:           /* ARB combine only */
	    case GL_ONE_MINUS_SRC_COLOR: /* ARB combine only */
	    case GL_SRC_ALPHA:
	    case GL_ONE_MINUS_SRC_ALPHA: /* ARB combine only */
	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	       texUnit->Combine.OperandRGB[2] = operand;
               break;
	    default:
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
	       return;
	    }
	 }
	 else if (ctx->Extensions.EXT_texture_env_combine) {
	    const GLenum operand = (GLenum) (GLint) *param;
	    if (texUnit->Combine.OperandRGB[2] == operand)
	       return;
	    /* operand must be GL_SRC_ALPHA which is the initial value - thus
	       don't need to actually compare the operand to the possible value */
	    else {
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
	       return;
	    }
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_OPERAND2_ALPHA:
	 if (ctx->Extensions.ARB_texture_env_combine) {
	    const GLenum operand = (GLenum) (GLint) *param;
	    if (texUnit->Combine.OperandA[2] == operand)
	       return;
	    switch (operand) {
	    case GL_SRC_ALPHA:
	    case GL_ONE_MINUS_SRC_ALPHA: /* ARB combine only */
	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	       texUnit->Combine.OperandA[2] = operand;
	       break;
	    default:
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
	       return;
	    }
	 }
	 else if (ctx->Extensions.EXT_texture_env_combine) {
	    const GLenum operand = (GLenum) (GLint) *param;
	    if (texUnit->Combine.OperandA[2] == operand)
	       return;
	    /* operand must be GL_SRC_ALPHA which is the initial value - thus
	       don't need to actually compare the operand to the possible value */
	    else {
               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
	       return;
	    }
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_RGB_SCALE:
	 if (ctx->Extensions.EXT_texture_env_combine ||
             ctx->Extensions.ARB_texture_env_combine) {
	    GLuint newshift;
	    if (*param == 1.0) {
	       newshift = 0;
	    }
	    else if (*param == 2.0) {
	       newshift = 1;
	    }
	    else if (*param == 4.0) {
	       newshift = 2;
	    }
	    else {
	       _mesa_error( ctx, GL_INVALID_VALUE,
                            "glTexEnv(GL_RGB_SCALE not 1, 2 or 4)" );
	       return;
	    }
	    if (texUnit->Combine.ScaleShiftRGB == newshift)
	       return;
	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	    texUnit->Combine.ScaleShiftRGB = newshift;
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      case GL_ALPHA_SCALE:
	 if (ctx->Extensions.EXT_texture_env_combine ||
             ctx->Extensions.ARB_texture_env_combine) {
	    GLuint newshift;
	    if (*param == 1.0) {
	       newshift = 0;
	    }
	    else if (*param == 2.0) {
	       newshift = 1;
	    }
	    else if (*param == 4.0) {
	       newshift = 2;
	    }
	    else {
	       _mesa_error( ctx, GL_INVALID_VALUE,
                            "glTexEnv(GL_ALPHA_SCALE not 1, 2 or 4)" );
	       return;
	    }
	    if (texUnit->Combine.ScaleShiftA == newshift)
	       return;
	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	    texUnit->Combine.ScaleShiftA = newshift;
	 }
	 else {
            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	    return;
	 }
	 break;
      default:
	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
	 return;
      }
   }
   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
      /* GL_EXT_texture_lod_bias */
      if (!ctx->Extensions.EXT_texture_lod_bias) {
	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
	 return;
      }
      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
	 if (texUnit->LodBias == param[0])
	    return;
	 FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texUnit->LodBias = param[0];
      }
      else {
         TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	 return;
      }
   }
   else if (target == GL_POINT_SPRITE_NV) {
      /* GL_ARB_point_sprite / GL_NV_point_sprite */
      if (!ctx->Extensions.NV_point_sprite
	  && !ctx->Extensions.ARB_point_sprite) {
	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
	 return;
      }
      if (pname == GL_COORD_REPLACE_NV) {
         const GLenum value = (GLenum) param[0];
         if (value == GL_TRUE || value == GL_FALSE) {
            /* It's kind of weird to set point state via glTexEnv,
             * but that's what the spec calls for.
             */
            const GLboolean state = (GLboolean) value;
            if (ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] == state)
               return;
            FLUSH_VERTICES(ctx, _NEW_POINT);
            ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] = state;
         }
         else {
            _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", value);
            return;
         }
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
         return;
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)",target );
      return;
   }

   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
      _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
                  _mesa_lookup_enum_by_nr(target),
                  _mesa_lookup_enum_by_nr(pname),
                  *param,
                  _mesa_lookup_enum_by_nr((GLenum) (GLint) *param));

   /* Tell device driver about the new texture environment */
   if (ctx->Driver.TexEnv) {
      (*ctx->Driver.TexEnv)( ctx, target, pname, param );
   }
}


void GLAPIENTRY
_mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
{
   _mesa_TexEnvfv( target, pname, &param );
}



void GLAPIENTRY
_mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
{
   GLfloat p[4];
   p[0] = (GLfloat) param;
   p[1] = p[2] = p[3] = 0.0;
   _mesa_TexEnvfv( target, pname, p );