texstate.c

winNT技术操作系统,国外开放的原代码和LIUX一样

         case GL_OPERAND1_ALPHA:
            if (ctx->Extensions.EXT_texture_env_combine ||
                ctx->Extensions.ARB_texture_env_combine) {
               *params = (GLint) texUnit->Combine.OperandA[1];
            }
            else {
               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
            }
            break;
         case GL_OPERAND2_ALPHA:
            if (ctx->Extensions.EXT_texture_env_combine ||
                ctx->Extensions.ARB_texture_env_combine) {
               *params = (GLint) texUnit->Combine.OperandA[2];
            }
            else {
               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
            }
            break;
         case GL_RGB_SCALE:
            if (ctx->Extensions.EXT_texture_env_combine ||
                ctx->Extensions.ARB_texture_env_combine) {
               if (texUnit->Combine.ScaleShiftRGB == 0)
                  *params = 1;
               else if (texUnit->Combine.ScaleShiftRGB == 1)
                  *params = 2;
               else
                  *params = 4;
            }
            else {
               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
               return;
            }
            break;
         case GL_ALPHA_SCALE:
            if (ctx->Extensions.EXT_texture_env_combine ||
                ctx->Extensions.ARB_texture_env_combine) {
               if (texUnit->Combine.ScaleShiftA == 0)
                  *params = 1;
               else if (texUnit->Combine.ScaleShiftA == 1)
                  *params = 2;
               else
                  *params = 4;
            }
            else {
               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
               return;
            }
            break;
         default:
            _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname=0x%x)",
                        pname);
      }
   }
   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, "glGetTexEnviv(target)" );
	 return;
      }
      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
         *params = (GLint) texUnit->LodBias;
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(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, "glGetTexEnviv(target)" );
         return;
      }
      if (pname == GL_COORD_REPLACE_NV) {
         *params = (GLint) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
         return;
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
      return;
   }
}




/**********************************************************************/
/*                       Texture Parameters                           */
/**********************************************************************/

static GLboolean 
_mesa_validate_texture_wrap_mode(GLcontext * ctx,
				 GLenum target, GLenum eparam)
{
   const struct gl_extensions * const e = & ctx->Extensions;

   if (eparam == GL_CLAMP || eparam == GL_CLAMP_TO_EDGE ||
       (eparam == GL_CLAMP_TO_BORDER && e->ARB_texture_border_clamp)) {
      /* any texture target */
      return GL_TRUE;
   }
   else if (target != GL_TEXTURE_RECTANGLE_NV &&
	    (eparam == GL_REPEAT ||
	     (eparam == GL_MIRRORED_REPEAT &&
	      e->ARB_texture_mirrored_repeat) ||
	     (eparam == GL_MIRROR_CLAMP_EXT &&
	      (e->ATI_texture_mirror_once || e->EXT_texture_mirror_clamp)) ||
	     (eparam == GL_MIRROR_CLAMP_TO_EDGE_EXT &&
	      (e->ATI_texture_mirror_once || e->EXT_texture_mirror_clamp)) ||
	     (eparam == GL_MIRROR_CLAMP_TO_BORDER_EXT &&
	      (e->EXT_texture_mirror_clamp)))) {
      /* non-rectangle texture */
      return GL_TRUE;
   }

   _mesa_error( ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
   return GL_FALSE;
}


void GLAPIENTRY
_mesa_TexParameterf( GLenum target, GLenum pname, GLfloat param )
{
   _mesa_TexParameterfv(target, pname, &param);
}


void GLAPIENTRY
_mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
   GLenum eparam = (GLenum) (GLint) params[0];
   struct gl_texture_object *texObj;
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
      _mesa_debug(ctx, "glTexParameter %s %s %.1f(%s)...\n",
                  _mesa_lookup_enum_by_nr(target),
                  _mesa_lookup_enum_by_nr(pname),
                  *params,
		  _mesa_lookup_enum_by_nr(eparam));


   switch (target) {
      case GL_TEXTURE_1D:
         texObj = texUnit->Current1D;
         break;
      case GL_TEXTURE_2D:
         texObj = texUnit->Current2D;
         break;
      case GL_TEXTURE_3D:
         texObj = texUnit->Current3D;
         break;
      case GL_TEXTURE_CUBE_MAP:
         if (!ctx->Extensions.ARB_texture_cube_map) {
            _mesa_error( ctx, GL_INVALID_ENUM, "glTexParameter(target)" );
            return;
         }
         texObj = texUnit->CurrentCubeMap;
         break;
      case GL_TEXTURE_RECTANGLE_NV:
         if (!ctx->Extensions.NV_texture_rectangle) {
            _mesa_error( ctx, GL_INVALID_ENUM, "glTexParameter(target)" );
            return;
         }
         texObj = texUnit->CurrentRect;
         break;
      default:
         _mesa_error( ctx, GL_INVALID_ENUM, "glTexParameter(target)" );
         return;
   }

   switch (pname) {
      case GL_TEXTURE_MIN_FILTER:
         /* A small optimization */
         if (texObj->MinFilter == eparam)
            return;
         if (eparam==GL_NEAREST || eparam==GL_LINEAR) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->MinFilter = eparam;
         }
         else if ((eparam==GL_NEAREST_MIPMAP_NEAREST ||
                   eparam==GL_LINEAR_MIPMAP_NEAREST ||
                   eparam==GL_NEAREST_MIPMAP_LINEAR ||
                   eparam==GL_LINEAR_MIPMAP_LINEAR) &&
                  texObj->Target != GL_TEXTURE_RECTANGLE_NV) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->MinFilter = eparam;
         }
         else {
            _mesa_error( ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
            return;
         }
         break;
      case GL_TEXTURE_MAG_FILTER:
         /* A small optimization */
         if (texObj->MagFilter == eparam)
            return;

         if (eparam==GL_NEAREST || eparam==GL_LINEAR) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->MagFilter = eparam;
         }
         else {
            _mesa_error( ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
            return;
         }
         break;
      case GL_TEXTURE_WRAP_S:
         if (texObj->WrapS == eparam)
            return;
         if (_mesa_validate_texture_wrap_mode(ctx, texObj->Target, eparam)) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->WrapS = eparam;
         }
         else {
            return;
         }
         break;
      case GL_TEXTURE_WRAP_T:
         if (texObj->WrapT == eparam)
            return;
         if (_mesa_validate_texture_wrap_mode(ctx, texObj->Target, eparam)) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->WrapT = eparam;
         }
         else {
            return;
         }
         break;
      case GL_TEXTURE_WRAP_R:
         if (texObj->WrapR == eparam)
            return;
         if (_mesa_validate_texture_wrap_mode(ctx, texObj->Target, eparam)) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->WrapR = eparam;
         }
         else {
	    return;
         }
         break;
      case GL_TEXTURE_BORDER_COLOR:
         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texObj->BorderColor[RCOMP] = params[0];
         texObj->BorderColor[GCOMP] = params[1];
         texObj->BorderColor[BCOMP] = params[2];
         texObj->BorderColor[ACOMP] = params[3];
         UNCLAMPED_FLOAT_TO_CHAN(texObj->_BorderChan[RCOMP], params[0]);
         UNCLAMPED_FLOAT_TO_CHAN(texObj->_BorderChan[GCOMP], params[1]);
         UNCLAMPED_FLOAT_TO_CHAN(texObj->_BorderChan[BCOMP], params[2]);
         UNCLAMPED_FLOAT_TO_CHAN(texObj->_BorderChan[ACOMP], params[3]);
         break;
      case GL_TEXTURE_MIN_LOD:
         if (texObj->MinLod == params[0])
            return;
         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texObj->MinLod = params[0];
         break;
      case GL_TEXTURE_MAX_LOD:
         if (texObj->MaxLod == params[0])
            return;
         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texObj->MaxLod = params[0];
         break;
      case GL_TEXTURE_BASE_LEVEL:
         if (params[0] < 0.0) {
            _mesa_error(ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
            return;
         }
         if (target == GL_TEXTURE_RECTANGLE_NV && params[0] != 0.0) {
            _mesa_error(ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
            return;
         }
         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texObj->BaseLevel = (GLint) params[0];
         break;
      case GL_TEXTURE_MAX_LEVEL:
         if (params[0] < 0.0) {
            _mesa_error(ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
            return;
         }
         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texObj->MaxLevel = (GLint) params[0];
         break;
      case GL_TEXTURE_PRIORITY:
         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texObj->Priority = CLAMP( params[0], 0.0F, 1.0F );
         break;
      case GL_TEXTURE_MAX_ANISOTROPY_EXT:
         if (ctx->Extensions.EXT_texture_filter_anisotropic) {
	    if (params[0] < 1.0) {
	       _mesa_error(ctx, GL_INVALID_VALUE, "glTexParameter(param)" );
	       return;
	    }
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            /* clamp to max, that's what NVIDIA does */
            texObj->MaxAnisotropy = MIN2(params[0],
                                         ctx->Const.MaxTextureMaxAnisotropy);
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glTexParameter(pname=GL_TEXTURE_MAX_ANISOTROPY_EXT)");
            return;
         }
         break;
      case GL_TEXTURE_COMPARE_SGIX:
         if (ctx->Extensions.SGIX_shadow) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->CompareFlag = params[0] ? GL_TRUE : GL_FALSE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glTexParameter(pname=GL_TEXTURE_COMPARE_SGIX)");
            return;
         }
         break;
      case GL_TEXTURE_COMPARE_OPERATOR_SGIX:
         if (ctx->Extensions.SGIX_shadow) {
            GLenum op = (GLenum) params[0];
            if (op == GL_TEXTURE_LEQUAL_R_SGIX ||
                op == GL_TEXTURE_GEQUAL_R_SGIX) {
               FLUSH_VERTICES(ctx, _NEW_TEXTURE);
               texObj->CompareOperator = op;
            }
            else {
               _mesa_error(ctx, GL_INVALID_ENUM, "glTexParameter(param)");
            }
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                    "glTexParameter(pname=GL_TEXTURE_COMPARE_OPERATOR_SGIX)");
            return;
         }
         break;
      case GL_SHADOW_AMBIENT_SGIX: /* aka GL_TEXTURE_COMPARE_FAIL_VALUE_ARB */
         if (ctx->Extensions.SGIX_shadow_ambient) {
            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
            texObj->ShadowAmbient = CLAMP(params[0], 0.0F, 1.0F);
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glTexParameter(pname=GL_SHADOW_AMBIENT_SGIX)");
            return;
         }
         break;
      case GL_GENERATE_MIPMAP_SGIS:
         if (ctx->Extensions.SGIS_generate_mipmap) {
            texObj->GenerateMipmap = params[0] ? GL_TRUE : GL_FALSE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glTexParameter(pname=GL_GENERATE_MIPMAP_SGIS)");
            return;
         }
         break;
      case GL_TEXTURE_COMPARE_MODE_ARB:
         if (ctx->Extensions.ARB_shadow) {
            const GLenum mode = (GLenum) params[0];
            if (mode == GL_NONE || mode == GL_COMPARE_R_TO_TEXTURE_ARB) {
               FLUSH_VERTICES(ctx, _NEW_TEXTURE);
               texObj->CompareMode = mode;
            }
            else {
               _mesa_error(ctx, GL_INVALID_ENUM,